Difference between revisions of "Nesevo Virtual Labs"

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= Nokia/Cumulus Multi-Vendor Lab =
 
= Nokia/Cumulus Multi-Vendor Lab =
 +
 +
The targets of this lab are to :
 +
 +
* mix Nokia SR-Linux and Cumulus VXLAN nodes, in spine or leaf roles
 +
* make this environment work for different kinds of setup : cross-DC L2, differentiated L3 gateways per leaf per VRF, anycast gateway cross or intra DC, etc.
 +
* spot compatibility issues if existing
 +
 +
To reach those goals, we'll use the Nokia lab tool "containerlab" https://containerlab.srlinux.dev/, labs from https://clabs.netdevops.me/ helped a lot. Many thanks to the contributors.
 +
 +
We'll need a Linux host with Docker installed on it + kvm virtualization enhancements activated (important if your host is a VM). If virtualization optimization is not ok, you won't be able to launch the most of devices.
 +
 +
Installation details are referenced there : https://containerlab.srlinux.dev/install/
 +
 +
Once installed, you'll need to register the different NOS images you'll use. Cumulus image is present on a public registrery, but Nokia/Arista/Juniper are not, you'll need a vendor support account to retreive them. Once downloaded (.tgz file typically) you can "docker load" the image :
 +
 +
For private images :<syntaxhighlight lang="bash">
 +
sudo docker load -i 21.6.1-235.tar.xz       /* (Nokia)  */
 +
sudo docker load -i cEOS64-lab-4.26.1F.tar    /* (Arista) */
 +
</syntaxhighlight>For public images :<syntaxhighlight lang="bash">
 +
sudo docker pull networkop/cx:4.3.0     /* (Cumulus) */
 +
</syntaxhighlight>
 +
 +
To verify your installed images, you can run "sudo docker images"<syntaxhighlight lang="bash">
 +
plancastre@containerlab:~/00.LAB/senss$ sudo docker images
 +
REPOSITORY                        TAG          IMAGE ID      CREATED        SIZE
 +
networkop/cx                      4.3.0        a40541ed15ba  2 weeks ago    733MB
 +
srlinux                          21.6.1-235  e29aed30e83f  3 weeks ago    1.14GB
 +
networkop/ignite                  dev          dcc5eff29355  4 weeks ago    37.9MB
 +
networkop/kernel                  4.19        e794d8875f83  3 months ago  88MB
 +
frrouting/frr                    v7.5.1      c3e13a4c5918  3 months ago  123MB
 +
 +
</syntaxhighlight>Once you've got all your images, to run the lab, you'll need a .yml file defining the topology to run.
 +
 +
In our lab, we've started with the 5-clos lab file from Nokia site, which we've forked.
 +
 +
We can see there is a branch "kinds" where we can define templates of nodes, in order to not rewrite whole parameters when creating nodes. For the images, it's important to take the repository name + tag.
 +
 +
'''Note:''' If the tag is "latest" it is not needed.
 +
 +
All supported "kinds" are referenced there : https://containerlab.srlinux.dev/manual/kinds/kinds/
 +
 +
'''Note:''' yml is indentation sensitive, so please respect the "double space" used to define hierarchy. Below the lab diagram + the yml file associated
 +
 +
== Infos on nodes ==
 +
 +
=== L3 infos ===
 +
{| class="wikitable"
 +
|+
 +
!Device
 +
!OS
 +
!ASN
 +
!VTEP IP
 +
!swp1 or eth1/1
 +
!swp2 or eth1/2
 +
!swp3 or eth1/3
 +
!SVI
 +
|-
 +
|client1
 +
|Linux
 +
|<none>
 +
|<none>
 +
|vlan100: 192.168.1.1/24
 +
vlan200: 192.168.2.1/24
 +
 +
route 192.168.200.0/24 via 192.168.2.254
 +
|<none>
 +
|<none>
 +
|<none>
 +
|-
 +
|client2
 +
|Linux
 +
|<none>
 +
|<none>
 +
|vlan100: 192.168.1.2/24
 +
vlan200: 192.168.2.2/24
 +
 +
route 192.168.200.0/24 via 192.168.2.254
 +
|<none>
 +
|<none>
 +
|<none>
 +
|-
 +
|client3
 +
|Linux
 +
|<none>
 +
|<none>
 +
|vlan100: 192.168.1.3/24
 +
vlan200: 192.168.200.1/24
 +
 +
route 192.168.2.0/24 via 192.168.200.254
 +
|<none>
 +
|<none>
 +
|<none>
 +
|-
 +
|client4
 +
|Linux
 +
|<none>
 +
|<none>
 +
|vlan100: 192.168.1.3/24
 +
vlan200: 192.168.200.2/24
 +
 +
route 192.168.2.0/24 via 192.168.200.254
 +
|<none>
 +
|<none>
 +
|<none>
 +
|-
 +
|leaf1
 +
|CVX
 +
|65011
 +
|10.255.255.5/32
 +
|10.254.254.8/31
 +
|10.254.254.10/31
 +
|trunk vlan 100,200
 +
|vlan200 : 192.168.2.254/24
 +
|-
 +
|leaf2
 +
|SRLinux
 +
|65012
 +
|10.255.255.6/32
 +
|10.254.254.12/31
 +
|10.254.254.14/31
 +
|trunk vlan 100,200
 +
|irb0.200 : 192.168.2.254/24
 +
|-
 +
|leaf3
 +
|CVX
 +
|65013
 +
|10.255.255.7/32
 +
|10.254.254.22/31
 +
|10.254.254.24/31
 +
|trunk vlan 100,200
 +
|vlan200 : 192.168.200.254/24
 +
|-
 +
|leaf4
 +
|SRLinux
 +
|65014
 +
|10.255.255.8/32
 +
|10.254.254.26/31
 +
|10.254.254.28/31
 +
|trunk vlan 100,200
 +
|irb0.200 : 192.168.200.254/24
 +
|-
 +
|spine1
 +
|CVX
 +
|65001
 +
|10.255.255.1/32
 +
|10.254.254.9/31
 +
|10.254.254.13/31
 +
|10.254.254.0/31
 +
|<none>
 +
|-
 +
|spine2
 +
|CVX
 +
|65001
 +
|10.255.255.2/32
 +
|10.254.254.11/31
 +
|10.254.254.15/31
 +
|10.254.254.16/31
 +
|<none>
 +
|-
 +
|spine3
 +
|SRLinux
 +
|65002
 +
|10.255.255.3/32
 +
|10.254.254.23/31
 +
|10.254.254.27/31
 +
|10.254.254.18/31
 +
|<none>
 +
|-
 +
|spine4
 +
|SRLinux
 +
|65002
 +
|10.255.255.4/32
 +
|10.254.254.25/31
 +
|10.254.254.29/31
 +
|10.254.254.20/31
 +
|<none>
 +
|-
 +
|superspine1
 +
|CVX
 +
|65003
 +
|10.255.255.9/32
 +
|10.254.254.1/31
 +
|10.254.254.19/31
 +
|<none>
 +
|<none>
 +
|-
 +
|superspine2
 +
|SRLinux
 +
|65003
 +
|10.255.255.10/32
 +
|10.254.254.17/31
 +
|10.254.254.21/31
 +
|<none>
 +
|<none>
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|}
 +
 +
=== VXLAN/BGP infos ===
 +
Note : in our lab, route-distinguisher is constructed on the model <loopback_ip>:<vlan_id>
 +
{| class="wikitable"
 +
|+
 +
!service
 +
!vlan id
 +
!route-target
 +
!VNI
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!Commentaires
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|-
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|L2 cross-DC
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|100
 +
|target:65000:100
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|100
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|the 4 clients are in the same broadcast domain / subnet
 +
|-
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|L3VPN cros-DC
 +
|200
 +
|target:65000:200
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target:65000:10200
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|200 (for L2)
 +
10200 (for routing)
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|the 4 clients are separated in 2 different subnets. Traffic is routed within dedicated VNI
 +
To be noted that in the current setup VMTO is not implemented, so cross DC traffic is not optimized.
 +
|}
 +
 +
== Lab diagram ==
 +
[[File:Lab-srl-diagram.png|ohne|mini|600x600px]]
 +
 +
== yml lab file ==
 +
<syntaxhighlight lang="yaml">
 +
# topology documentation: http://containerlab.srlinux.dev/lab-examples/min-5clos/
 +
name: lab-srl-cum
 +
 +
topology:
 +
  kinds:
 +
    srl:
 +
      image: srlinux:21.6.1-235
 +
    linux:
 +
      image: ghcr.io/hellt/network-multitool
 +
    cvx:
 +
      image: networkop/cx:4.3.0
 +
      runtime: docker
 +
  nodes:
 +
    leaf1:
 +
      kind: cvx
 +
    leaf2:
 +
      kind: srl
 +
      type: ixrd2
 +
    leaf3:
 +
      kind: cvx
 +
    leaf4:
 +
      kind: srl
 +
      type: ixrd2
 +
 +
    spine1:
 +
      kind: cvx
 +
    spine2:
 +
      kind: cvx
 +
    spine3:
 +
      kind: srl
 +
      type: ixr6
 +
    spine4:
 +
      kind: srl
 +
      type: ixr6
 +
 +
    superspine1:
 +
      kind: cvx
 +
    superspine2:
 +
      kind: srl
 +
      type: ixr6
 +
 +
    client1:
 +
      kind: linux
 +
    client2:
 +
      kind: linux
 +
    client3:
 +
      kind: linux
 +
    client4:
 +
      kind: linux
 +
 +
  links:
 +
    # leaf to spine links POD1
 +
    - endpoints: ["leaf1:swp1", "spine1:swp1"]
 +
    - endpoints: ["leaf1:swp2", "spine2:swp1"]
 +
    - endpoints: ["leaf2:e1-1", "spine1:swp2"]
 +
    - endpoints: ["leaf2:e1-2", "spine2:swp2"]
 +
 +
    # spine to superspine links POD1
 +
    - endpoints: ["spine1:swp3", "superspine1:swp1"]
 +
    - endpoints: ["spine2:swp3", "superspine2:e1-1"]
 +
 +
    # leaf to spine links POD2
 +
    - endpoints: ["leaf3:swp1", "spine3:e1-1"]
 +
    - endpoints: ["leaf3:swp2", "spine4:e1-1"]
 +
    - endpoints: ["leaf4:e1-1", "spine3:e1-2"]
 +
    - endpoints: ["leaf4:e1-2", "spine4:e1-2"]
 +
 +
    # spine to superspine links POD2
 +
    - endpoints: ["spine3:e1-3", "superspine1:swp2"]
 +
    - endpoints: ["spine4:e1-3", "superspine2:e1-2"]
 +
 +
    # client connection links
 +
    - endpoints: ["client1:eth1", "leaf1:swp3"]
 +
    - endpoints: ["client2:eth1", "leaf2:e1-3"]
 +
    - endpoints: ["client3:eth1", "leaf3:swp3"]
 +
    - endpoints: ["client4:eth1", "leaf4:e1-3"]
 +
 +
</syntaxhighlight>
 +
 +
Once the nodes are defined, we have to define the needed connections between the nodes.
 +
 +
Each endpoint is defined as '<nowiki/>'''<nowiki/>'<node_name>:<interface_name><nowiki>''</nowiki>'''
 +
 +
When all is ok, you can launch in suduoer the topology.
 +
 +
For example :<syntaxhighlight lang="bash">
 +
sudo containerlab deploy --topo topo.clab.yml --reconfigure
 +
 +
Note: The option "reconfigure" is used there in order to not have to destroy instances when updating topology/relaunching.
 +
</syntaxhighlight>Another info regarding the yml file, it's possible to quickly generate files with the '''"containerlab gen -n 3tier --nodes 4,2,1"''' command for example. https://containerlab.srlinux.dev/cmd/generate/
 +
 +
To be noted that the "tier-x" notion in containerlab is inversed regarding the rfc 7938 (tier1 is superspine level into the rfc, tier1 is leaf level in nokia tool)
 +
 +
At the end of the topology launch, you can retreive the details :<syntaxhighlight lang="yaml">
 +
INFO[0011] Writing /etc/hosts file                     
 +
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+
 +
| #  |            Name            | Container ID |              Image              | Kind  | Group |  State  |  IPv4 Address  |    IPv6 Address    |
 +
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+
 +
|  1 | clab-lab-srl-cum-client1    | 25e2bbf6b13f | ghcr.io/hellt/network-multitool | linux |      | running | 172.20.20.2/24  | 2001:172:20:20::2/64 |
 +
|  2 | clab-lab-srl-cum-client2    | 17d82d5a6e21 | ghcr.io/hellt/network-multitool | linux |      | running | 172.20.20.4/24  | 2001:172:20:20::4/64 |
 +
|  3 | clab-lab-srl-cum-client3    | f8d78527c1b1 | ghcr.io/hellt/network-multitool | linux |      | running | 172.20.20.6/24  | 2001:172:20:20::6/64 |
 +
|  4 | clab-lab-srl-cum-client4    | 913a0172d0c5 | ghcr.io/hellt/network-multitool | linux |      | running | 172.20.20.10/24 | 2001:172:20:20::a/64 |
 +
|  5 | clab-lab-srl-cum-leaf1      | 9ffc334af2b1 | networkop/cx:4.3.0              | cvx  |      | running | 172.20.20.9/24  | 2001:172:20:20::9/64 |
 +
|  6 | clab-lab-srl-cum-leaf2      | 7d3eb855d749 | srlinux:21.6.1-235              | srl  |      | running | 172.20.20.14/24 | 2001:172:20:20::e/64 |
 +
|  7 | clab-lab-srl-cum-leaf3      | e0d36ffc606a | networkop/cx:4.3.0              | cvx  |      | running | 172.20.20.7/24  | 2001:172:20:20::7/64 |
 +
|  8 | clab-lab-srl-cum-leaf4      | e6753b1d099e | srlinux:21.6.1-235              | srl  |      | running | 172.20.20.12/24 | 2001:172:20:20::c/64 |
 +
|  9 | clab-lab-srl-cum-spine1      | a7e63993d052 | networkop/cx:4.3.0              | cvx  |      | running | 172.20.20.5/24  | 2001:172:20:20::5/64 |
 +
| 10 | clab-lab-srl-cum-spine2      | 3124250d5b75 | networkop/cx:4.3.0              | cvx  |      | running | 172.20.20.3/24  | 2001:172:20:20::3/64 |
 +
| 11 | clab-lab-srl-cum-spine3      | 5e300ca3f66f | srlinux:21.6.1-235              | srl  |      | running | 172.20.20.11/24 | 2001:172:20:20::b/64 |
 +
| 12 | clab-lab-srl-cum-spine4      | 0a59e60a596b | srlinux:21.6.1-235              | srl  |      | running | 172.20.20.13/24 | 2001:172:20:20::d/64 |
 +
| 13 | clab-lab-srl-cum-superspine1 | 3d9935413fc2 | networkop/cx:4.3.0              | cvx  |      | running | 172.20.20.8/24  | 2001:172:20:20::8/64 |
 +
| 14 | clab-lab-srl-cum-superspine2 | 5bc58d423e2c | srlinux:21.6.1-235              | srl  |      | running | 172.20.20.15/24 | 2001:172:20:20::f/64 |
 +
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+
 +
</syntaxhighlight>The containerlab program creates the updates into the host file + generates an ansible inventory file.
 +
 +
There are different ways to connect onto the docker instances, within docker exec commands or SSH directly the IP address related above.
 +
 +
For example :<syntaxhighlight lang="bash">
 +
sudo docker exec -it clab-lab-srl-cum-spine1 bash
 +
</syntaxhighlight>-->>> allows to launch a bash on the cumulus device (then you run the different net commands)<syntaxhighlight lang="bash">
 +
sudo docker exec -it clab-lab-srl-cum-leaf2 sr_cli
 +
</syntaxhighlight>-->>> allows to launch the cli on a SRLinux device
 +
 +
 +
To end this setup preparation, the containerlab tool integrates an option to launch a webserver showing the lab topology in graph + node details
 +
 +
By default, it's listening on port 50080 of the host
 +
 +
Then, you can access to the following web page showing the topology + lab infos
 +
[[File:Lab graph tool.jpg|ohne|mini|900x900px]]
 +
 +
 +
Finally, if you want to stop a lab, please run '''<nowiki>''</nowiki>containerlab destroy --topo <topology>.yml<nowiki>''</nowiki>'''
 +
 +
At this step, nodes are running, connections are done, but configurations are empty.
 +
 +
'''So, it's time to configure them :)'''
 +
 +
Configuration files are attached to this blog. Once validated, they are exportable and can be called by the tool when launching the lab. Below how to do it :
 +
 +
Firstable, once you ve finished your "hand made config", you can run the following command to save it :<syntaxhighlight lang="bash">
 +
containerlab save -t quickstart.clab.yml
 +
</syntaxhighlight>'''To be noted it's only working for Nokia nodes in this lab'''. CVX configurations will have to be called by another method (or pushed manually)
 +
 +
It will create one folder per node into the lab folder which gives the following tree :
 +
[[File:Topology-srl.jpg|ohne|mini]]
 +
 +
 +
'''Note''': For Cumulus, you can apparently retrieve configurations files within adding the following parameters into lab config file. '''To be tested.''' some lab samples here : https://github.com/hellt/clabs/blob/main/labs/cvx04/symm-mh.clab.yml
 +
 +
 +
Now we have the lab running, below the different commands to check that all is working as expected : <syntaxhighlight lang="yaml">
 +
-------------------------------------------
 +
Check L2 tables ///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
A:leaf2# show network-instance mac-vrf-100 bridge-table mac-table all                                                                                   
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
Mac-table of network instance mac-vrf-100
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
+--------------------+-----------------------------------------+------------+-------------+---------+--------+-----------------------------------------+
 +
|      Address      |              Destination              | Dest Index |    Type    | Active  | Aging  |              Last Update              |
 +
+====================+=========================================+============+=============+=========+========+=========================================+
 +
| AA:C1:AB:0C:60:D6  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T13:06:17.000Z                |
 +
|                    | vtep:10.255.255.8 vni:100              | 67        |            |        |        |                                        |
 +
| AA:C1:AB:23:31:04  | ethernet-1/3.100                        | 2          | learnt      | true    | 300    | 2021-10-08T13:06:10.000Z                |
 +
| AA:C1:AB:4B:FF:71  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T12:55:28.000Z                |
 +
|                    | vtep:10.255.255.5 vni:100              | 60        |            |        |        |                                        |
 +
| AA:C1:AB:B5:79:50  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T12:43:37.000Z                |
 +
|                    | vtep:10.255.255.7 vni:100              | 64        |            |        |        |                                        |
 +
+--------------------+-----------------------------------------+------------+-------------+---------+--------+-----------------------------------------+
 +
Total Irb Macs            :    0 Total    0 Active
 +
Total Static Macs        :    0 Total    0 Active
 +
Total Duplicate Macs      :    0 Total    0 Active
 +
Total Learnt Macs        :    1 Total    1 Active
 +
Total Evpn Macs          :    3 Total    3 Active
 +
Total Evpn static Macs    :    0 Total    0 Active
 +
Total Irb anycast Macs    :    0 Total    0 Active
 +
Total Macs                :    4 Total    4 Active
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
--{ + running }--[  ]--                   
 +
 +
Note : type learnt matches the local learnt mac, evpn are learnt within VXLAN                                                   
 +
 +
Cumulus :
 +
 +
root@leaf1-cum-dc1:/# net show bridge macs vlan 100
 +
 +
VLAN  Master  Interface  MAC                TunnelDest  State      Flags        LastSeen
 +
----  ------  ---------  -----------------  ----------  ---------  ------------  --------
 +
100  bridge  swp3      aa:c1:ab:4b:ff:71                                      00:00:02
 +
100  bridge  swp3      aa:c1:ab:4f:f2:e7              permanent                02:17:21
 +
100  bridge  vni100    22:2d:67:f1:bb:26              permanent                02:17:21
 +
100  bridge  vni100    aa:c1:ab:0c:60:d6                        extern_learn  <1 sec
 +
100  bridge  vni100    aa:c1:ab:23:31:04                        extern_learn  00:00:07
 +
100  bridge  vni100    aa:c1:ab:b5:79:50                        extern_learn  00:13:28
 +
 +
root@leaf1-cum-dc1:/# net show bridge macs vlan 200
 +
 +
VLAN  Master  Interface  MAC                TunnelDest  State      Flags        LastSeen
 +
----  ------  ---------  -----------------  ----------  ---------  ------------  --------
 +
200  bridge  swp3      aa:c1:ab:4b:ff:71                                      00:08:46
 +
200  bridge  swp3      aa:c1:ab:4f:f2:e7              permanent                02:16:36
 +
200  bridge  vni200    00:00:5e:00:01:01              static    sticky        00:14:26
 +
200  bridge  vni200    1e:0d:aa:46:53:b1              permanent                02:16:36
 +
200  bridge  vni200    02:77:6b:ff:00:41              static    sticky        01:00:52
 +
200  bridge  vni200    02:f8:b8:ff:00:41              static    sticky        00:14:26
 +
200  bridge  vni200    aa:c1:ab:b5:79:50                        extern_learn  00:11:51
 +
200  bridge  vni10200  02:77:6b:ff:00:00                        extern_learn  00:53:02
 +
200  bridge  vni10200  02:f8:b8:ff:00:00                        extern_learn  00:14:26
 +
200  bridge  vni10200  86:5e:aa:ca:50:be              permanent                02:16:36
 +
 +
 +
Note : the macs with permanent flag are local interfaces, physical ou logic (vtep)
 +
Note2 : extern_learn mac are the one learned via the VXLAN infra (and mapped to the vnixxx interface)
 +
 +
-------------------------------------------
 +
Check arp tables  ///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
:leaf2# show arpnd arp-entries                                                                                                                         
 +
+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
 +
|  Interface  | Subinterface  |    Neighbor    |    Origin    |    Link layer address      |                        Expiry                          |
 +
+===============+===============+=================+===============+=============================+=========================================================+
 +
| ethernet-1/1  |            0 |  10.254.254.13 |      dynamic | AA:C1:AB:59:65:EA          | 3 hours from now                                        |
 +
| ethernet-1/2  |            0 |  10.254.254.15 |      dynamic | AA:C1:AB:CB:F8:8A          | 3 hours from now                                        |
 +
| irb0          |          200 |    192.168.2.1 |          evpn | AA:C1:AB:4B:FF:71          |                                                        |
 +
| irb0          |          200 |    192.168.2.2 |      dynamic | AA:C1:AB:23:31:04          | 3 hours from now                                        |
 +
| mgmt0        |            0 |    172.20.20.1 |      dynamic | 02:42:63:9E:74:03          | 2 hours from now                                        |
 +
+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
  Total entries : 5 (0 static, 5 dynamic)
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
--{ + running }--[  ]--                                                                                     
 +
 +
Note : on Nokia you have to sort the entries basing on subinterface and the retrieve the L3VPN attached
 +
 +
A:leaf2# show arpnd arp-entries subinterface 200                                                                                                         
 +
+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
 +
|  Interface  | Subinterface  |    Neighbor    |    Origin    |    Link layer address      |                        Expiry                          |
 +
+===============+===============+=================+===============+=============================+=========================================================+
 +
| irb0          |          200 |    192.168.2.1 |          evpn | AA:C1:AB:4B:FF:71          |                                                        |
 +
| irb0          |          200 |    192.168.2.2 |      dynamic | AA:C1:AB:23:31:04          | 3 hours from now                                        |
 +
+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
  Total entries : 2 (0 static, 2 dynamic)
 +
----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
--{ + running }--[  ]--                                           
 +
 +
Cumulus :
 +
 +
Here we retrieve all arp infos linked to evpn
 +
 +
root@leaf1-cum-dc1:/# net show evpn arp-cache vni all
 +
VNI 100 #ARP (IPv4 and IPv6, local and remote) 2
 +
 +
Flags: I=local-inactive, P=peer-active, X=peer-proxy
 +
Neighbor        Type  Flags State    MAC              Remote ES/VTEP                Seq #'s
 +
192.168.1.3    remote      active  aa:c1:ab:b5:79:50 10.255.255.7                  0/0
 +
192.168.1.1    local        active  aa:c1:ab:4b:ff:71                                0/0
 +
 +
VNI 200 #ARP (IPv4 and IPv6, local and remote) 4
 +
 +
Flags: I=local-inactive, P=peer-active, X=peer-proxy
 +
Neighbor        Type  Flags State    MAC              Remote ES/VTEP                Seq #'s
 +
192.168.2.1    local        active  aa:c1:ab:4b:ff:71                                0/0
 +
192.168.200.254 remote      active  00:00:5e:00:01:01 10.255.255.8                  0/0
 +
192.168.2.254  remote      active  00:00:5e:00:01:01 10.255.255.6                  0/0
 +
192.168.200.1  remote      active  aa:c1:ab:b5:79:50 10.255.255.7                  0/0
 +
 +
VNI 400 #ARP (IPv4 and IPv6, local and remote) 0
 +
 +
 +
 +
-------------------------------------------
 +
Check bgp sessions' status - underlay ///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
A:spine3# show network-instance default protocols bgp neighbor | grep ipv4                                                                                                                                                                                                                                           
 +
| default    | 10.254.254.19  | udl-superspine          | S        | 65003          | established      | 0d:0h:22m:44s    | ipv4-unicast          | [13/4/4]      |
 +
| default    | 10.254.254.22  | udl-leaf    | S        | 65013          | established      | 0d:0h:22m:52s    | ipv4-unicast          | [13/1/4]      |
 +
 +
 +
Cumulus :
 +
 +
 +
root@leaf3:/# net show bgp ipv4 unicast summary
 +
BGP router identifier 10.255.255.7, local AS number 65013 vrf-id 0
 +
BGP table version 13
 +
RIB entries 25, using 4800 bytes of memory
 +
Peers 2, using 43 KiB of memory
 +
 +
Neighbor        V        AS  MsgRcvd  MsgSent  TblVer  InQ OutQ  Up/Down State/PfxRcd  PfxSnt
 +
10.254.254.23  4      65002      466      403        0    0    0 00:19:34            4      13
 +
10.254.254.25  4      65002      434      355        0    0    0 00:17:10            8      13
 +
 +
-------------------------------------------
 +
Check bgp sessions' status - overlay ///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
A:spine3# show network-instance default protocols bgp neighbor | grep evpn                                                                                                                                                                                                                                           
 +
| default  | 10.255.255.7    | ovl-leaf            | S        | 65013          | established  | 0d:0h:24m:14s| evpn      | [15/0/11]  |
 +
| default  | 10.255.255.9    | ovl-superspine      | S        | 65003          | established  | 0d:0h:24m:7s | evpn      | [11/0/4]  |
 +
 +
Cumulus :
 +
 +
root@leaf3-cum-dc1:/# net show bgp evpn summary
 +
BGP router identifier 10.255.255.7, local AS number 65013 vrf-id 0
 +
BGP table version 0
 +
RIB entries 29, using 5568 bytes of memory
 +
Peers 2, using 43 KiB of memory
 +
 +
Neighbor        V        AS  MsgRcvd  MsgSent  TblVer  InQ OutQ  Up/Down State/PfxRcd  PfxSnt
 +
10.255.255.3    4      65002      5618      4742        0    0    0 03:53:35          19      27
 +
10.255.255.4    4      65002      5565      4694        0    0    0 03:51:11          19      27
 +
 +
 +
-------------------------------------------
 +
Check EVPN L2 tables///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
<didn't spotted how to show evpn routes in a bgp fashion>
 +
 +
Cumulus :
 +
 +
root@leaf3-cum-dc1:/# net show bgp evpn route type 2
 +
BGP table version is 17, local router ID is 10.255.255.7
 +
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
 +
Origin codes: i - IGP, e - EGP, ? - incomplete
 +
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
 +
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
 +
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
 +
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
 +
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]
 +
 +
  Network          Next Hop            Metric LocPrf Weight Path
 +
                    Extended Community
 +
Route Distinguisher: 10.255.255.5:100
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
Route Distinguisher: 10.255.255.5:200
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.2.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.2.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
 +
Route Distinguisher: 10.255.255.6:200
 +
*  [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.2.254]
 +
                    10.255.255.6                          0 65002 65003 65001 65012 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*> [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.2.254]
 +
                    10.255.255.6                          0 65002 65003 65001 65012 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*  [2]:[0]:[48]:[02:77:6b:ff:00:41]
 +
                    10.255.255.6                          0 65002 65003 65001 65012 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*> [2]:[0]:[48]:[02:77:6b:ff:00:41]
 +
                    10.255.255.6                          0 65002 65003 65001 65012 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
Route Distinguisher: 10.255.255.7:100
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:100
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.1.3]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:100
 +
Route Distinguisher: 10.255.255.7:200
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:200
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.200.1]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:200
 +
Route Distinguisher: 10.255.255.8:200
 +
*  [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.200.254]
 +
                    10.255.255.8                          0 65002 65014 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*> [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.200.254]
 +
                    10.255.255.8                          0 65002 65014 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*  [2]:[0]:[48]:[02:f8:b8:ff:00:41]
 +
                    10.255.255.8                          0 65002 65014 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
*> [2]:[0]:[48]:[02:f8:b8:ff:00:41]
 +
                    10.255.255.8                          0 65002 65014 i
 +
                    RT:65000:200 ET:8 MM:0, sticky MAC
 +
 +
 +
and if we focus on our vni 100
 +
 +
root@leaf3-cum-dc1:/# net show bgp evpn route vni 100 type 2   
 +
BGP table version is 48, local router ID is 10.255.255.7
 +
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
 +
Origin codes: i - IGP, e - EGP, ? - incomplete
 +
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
 +
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
 +
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
 +
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
 +
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]
 +
 +
  Network          Next Hop            Metric LocPrf Weight Path
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
 +
                    10.255.255.5                          0 65002 65003 65001 65011 i
 +
                    RT:65000:100 ET:8
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:100
 +
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.1.3]
 +
                    10.255.255.7                      32768 i
 +
                    ET:8 RT:65000:100
 +
 +
 +
The additional route type "MAC+IP" is optional and is useful/mandatory when you do anycast irb.
 +
 +
 +
-------------------------------------------
 +
Check tables EVPN L3 ///
 +
-------------------------------------------
 +
 +
Nokia :
 +
 +
--{ + running }--[  ]--                                                                                                                                   
 +
A:leaf2# show network-instance ip-vrf-200 route-table all                                                                                                 
 +
-----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
IPv4 Unicast route table of network instance ip-vrf-200
 +
-----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
+-----------------------+-------+------------+----------------------+----------------------+----------+---------+--------------+--------------+
 +
|        Prefix        |  ID  | Route Type |    Route Owner      |      Best/Fib-      |  Metric  |  Pref  |  Next-hop  |  Next-hop  |
 +
|                      |      |            |                      |    status(slot)    |          |        |    (Type)    |  Interface  |
 +
+=======================+=======+============+======================+======================+==========+=========+==============+==============+
 +
| 192.168.2.0/24        | 9    | local      | net_inst_mgr        | True/success        | 0        | 0      | 192.168.2.25 | irb0.200    |
 +
|                      |      |            |                      |                      |          |        | 4 (direct)  |              |
 +
| 192.168.2.254/32      | 9    | host      | net_inst_mgr        | True/success        | 0        | 0      | None        | None        |
 +
|                      |      |            |                      |                      |          |        | (extract)    |              |
 +
| 192.168.2.255/32      | 9    | host      | net_inst_mgr        | True/success        | 0        | 0      | None        | None        |
 +
|                      |      |            |                      |                      |          |        | (broadcast)  |              |
 +
| 192.168.200.0/24      | 0    | bgp-evpn  | bgp_evpn_mgr        | True/success        | 0        | 170    | 10.255.255.8 | None        |
 +
|                      |      |            |                      |                      |          |        | (indirect/vx |              |
 +
|                      |      |            |                      |                      |          |        | lan)        |              |
 +
+-----------------------+-------+------------+----------------------+----------------------+----------+---------+--------------+--------------+
 +
-----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
4 IPv4 routes total
 +
4 IPv4 prefixes with active routes
 +
0 IPv4 prefixes with active ECMP routes
 +
-----------------------------------------------------------------------------------------------------------------------------------------------------------
 +
--{ + running }--[  ]--                                                                                                                                   
 +
A:leaf2#
 +
 +
<didn't spotted how to show evpn routes in a bgp fashion>
 +
 +
Cumulus :
 +
 +
root@leaf1-cum-dc1:/# net show route vrf ip-vrf-200
 +
show ip route vrf ip-vrf-200
 +
=============================
 +
Codes: K - kernel route, C - connected, S - static, R - RIP,
 +
      O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
 +
      T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
 +
      F - PBR, f - OpenFabric,
 +
      > - selected route, * - FIB route, q - queued, r - rejected, b - backup
 +
      t - trapped, o - offload failure
 +
 +
VRF ip-vrf-200:
 +
K>* 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 04:48:42
 +
B  192.168.2.0/24 [20/0] via 10.255.255.6, vlan200 onlink, weight 1, 04:27:26
 +
C>* 192.168.2.0/24 is directly connected, vlan200, 04:48:42
 +
B>* 192.168.200.0/24 [20/0] via 10.255.255.8, vlan200 onlink, weight 1, 03:48:49
 +
 +
 +
root@leaf1-cum-dc1:/# net show bgp evpn route type 5
 +
BGP table version is 3, local router ID is 10.255.255.5
 +
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
 +
Origin codes: i - IGP, e - EGP, ? - incomplete
 +
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
 +
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
 +
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
 +
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
 +
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]
 +
 +
  Network          Next Hop            Metric LocPrf Weight Path
 +
                    Extended Community
 +
Route Distinguisher: 10.255.255.6:10200
 +
*  [5]:[0]:[24]:[192.168.2.0]
 +
                    10.255.255.6                          0 65001 65012 i
 +
                    RT:65000:10200 ET:8 Rmac:02:77:6b:ff:00:00
 +
*> [5]:[0]:[24]:[192.168.2.0]
 +
                    10.255.255.6                          0 65001 65012 i
 +
                    RT:65000:10200 ET:8 Rmac:02:77:6b:ff:00:00
 +
Route Distinguisher: 10.255.255.8:10200
 +
*> [5]:[0]:[24]:[192.168.200.0]
 +
                    10.255.255.8                          0 65001 65003 65002 65014 i
 +
                    RT:65000:10200 ET:8 Rmac:02:f8:b8:ff:00:00
 +
 +
 +
-------------------------------------------
 +
Check arp hosts ///
 +
-------------------------------------------
 +
 +
From client #1 /
 +
 +
 +
bash-5.0# arp
 +
Address                  HWtype  HWaddress          Flags Mask            Iface
 +
192.168.1.3              ether  aa:c1:ab:b5:79:50  C                    eth1.100
 +
192.168.1.4              ether  aa:c1:ab:0c:60:d6  C                    eth1.100
 +
192.168.2.2              ether  aa:c1:ab:23:31:04  C                    eth1.200
 +
192.168.2.254            ether  aa:c1:ab:4f:f2:e7  C                    eth1.200
 +
192.168.1.2              ether  aa:c1:ab:23:31:04  C                    eth1.100
 +
containerlab.local      ether  02:42:63:9e:74:03  C                    eth0
 +
 +
 +
-------------------------------------------
 +
Ping ///
 +
-------------------------------------------
 +
 +
From client #1 /
 +
 +
L2 service ping (vlan 100) ----------------------
 +
 +
bash-5.0# ping -c 1 192.168.1.2
 +
PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
 +
64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.812 ms
 +
 +
--- 192.168.1.2 ping statistics ---
 +
1 packets transmitted, 1 received, 0% packet loss, time 0ms
 +
rtt min/avg/max/mdev = 0.812/0.812/0.812/0.000 MsgRcvd
 +
bash-5.0# ping -c 1 192.168.1.3
 +
PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data.
 +
64 bytes from 192.168.1.3: icmp_seq=1 ttl=64 time=1.40 ms
 +
 +
--- 192.168.1.3 ping statistics ---
 +
1 packets transmitted, 1 received, 0% packet loss, time 0ms
 +
rtt min/avg/max/mdev = 1.403/1.403/1.403/0.000 ms
 +
bash-5.0# ping -c 1 192.168.1.4
 +
PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data.
 +
64 bytes from 192.168.1.4: icmp_seq=1 ttl=64 time=1.62 ms
 +
 +
--- 192.168.1.4 ping statistics ---
 +
1 packets transmitted, 1 received, 0% packet loss, time 0ms
 +
rtt min/avg/max/mdev = 1.619/1.619/1.619/0.000 ms
 +
 +
L3 service ping (vlan 200)
 +
 +
bash-5.0# ping -c 1 192.168.2.1
 +
PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
 +
64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=0.053 ms
 +
 +
--- 192.168.2.1 ping statistics ---
 +
1 packets transmitted, 1 received, 0% packet loss, time 1ms
 +
rtt min/avg/max/mdev = 0.053/0.053/0.053/0.000 ms
 +
bash-5.0# ^C
 +
bash-5.0# ping -c 1 192.168.2.2
 +
PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data.
 +
64 bytes from 192.168.2.2: icmp_seq=1 ttl=64 time=0.611 ms
 +
 +
--- 192.168.2.2 ping statistics ---
 +
1 packets transmitted, 1 received, 0% packet loss, time 0ms
 +
rtt min/avg/max/mdev = 0.611/0.611/0.611/0.000 ms
 +
 +
 +
-------------------------------------------
 +
Traceroute ///
 +
-------------------------------------------
 +
 +
L3 service traceroute (vlan 200)
 +
 +
bash-5.0# traceroute 192.168.200.1
 +
traceroute to 192.168.200.1 (192.168.200.1), 30 hops max, 46 byte packets
 +
1  192.168.2.254 (192.168.2.254)  0.012 ms  0.010 ms  0.007 ms
 +
2  192.168.200.254 (192.168.200.254)  2.751 ms  *  2.549 ms
 +
3  192.168.200.1 (192.168.200.1)  2.084 ms  1.805 ms  1.761 ms
 +
 +
</syntaxhighlight>To come back on the setup, we wanted to implement solutions inspired by the <nowiki>RFC 7938</nowiki> rfc7938  (see section 5.2.1)
 +
 +
* eBGP will be used for Underlay and Overlay
 +
* eBGP single-hop sessions are established over direct point-to-point links interconnecting the network nodes, no multi-hop or loopback sessions are used, even in the case of multiple links between the same pair of nodes.
 +
* Private Use ASNs from the range 64512-65534 are used to avoid ASN conflicts.
 +
* A single ASN is allocated to all of the Clos topology's Tier 1 devices.
 +
* A unique ASN is allocated to each set of Tier 2 devices in the same cluster.
 +
* A unique ASN is allocated to every Tier 3 device (e.g., ToR) in this topology.
 +
 +
In add, depending of network nodes, it will be interesting to :
 +
 +
* Add fast-failover option for underlay + add link-debounce on links to limit possible impacts in case of link flaps. BFD could be considered in some cases
 +
* Have the best ECMP hashing algorythm on leaf nodes. On tier-1/tier-2 levels hashing will be based on underlay part (trafic inter-vtep), so L3-L4 decision, but some models can retreive the vni-id if I well remember.
 +
* Implement the "multipath relax" since we could have multiple AS paths for a same destination.
 +
* Implement gshut community on underlay (on tier-1/tier-2) or at least policies to prepend underlay routes to avoid some nodes in case of maintenance.
 +
 +
== Thoughts/Points to deepend ==
 +
On leaf nodes, LACP over multiple nodes is feasible within ESI, but impact on incidents/maintenance can vary depending on the vendors.
 +
 +
'''Tests need to be done to check that.'''
 +
 +
Some sysadmin would like to KISS and have client servers connected in active/passive bonding, with eventually single-leaf ports aggregation.
 +
 +
'''Note :''' NH ESI in FIB management on ingress nodes can have some limitations (numbers of installable next-hop, load-balancing, etc. oftenly linked to the node chipset)
 +
 +
 +
Another important engineering point to define at the beginning is : '''Do we authorize multisite L2 propagation or not ?'''
 +
 +
From my point-of-view, the smaller are the L2 segments the better it is. I would suggest Local L2 segments wit anycast gateways provided by Leaf switches, with L3 routing between DCs within EVPN type5 routes sharing only. Nevertheless, some business requirements for endcustomers can keep extended L2 alive.
 +
 +
We have to be careful when implementing Consistent hashing. ex: <nowiki>https://docs.nvidia.com/networking-ethernet-software/cumulus-linux-44/Layer-3/Routing/Equal-Cost-Multipath-Load-Sharing-Hardware-ECMP/</nowiki>
 +
 +
If possible activate it per VRF, not globally, and restrict on dedicated subnets << depends of the vendor, it can be dangerous regarding memory management
 +
 +
 +
 +
Think at configuring the bgp option to not advertise routes to peers before they are installed in FIB. 
 +
 +
 +
We can implement leaf roles in some cases, to be able to do "light traffic engineering " on DCI links in some setup.
 +
 +
These roles will be managed within bgp communities added to VTEP /32. Look at the diagram below. Depending of the colour, the eBGP sessions between SupS will prepend or not the VTEP IPs announced to the remote DC
 +
[[File:Fabric-roles.jpg|ohne|mini|1200x1200px]]
 +
<blockquote>'''To be contiuned'''</blockquote>
 +
 +
== Lab archives ==
 +
<blockquote>Reminder : following config are for lab, so please don't pay attention on typos/lack of security params/unused config. Thanks \o/</blockquote>
 +
 +
=== Credentials ===
 +
<syntaxhighlight lang="bash">
 +
SRLinux : admin/<no_password>
 +
 +
CVX : cumulus/cumulus
 +
</syntaxhighlight>
 +
 +
=== Lab archives ===
 +
layer 2 (vlan 100) + layer 3 (vlan 200) lab, 10/12/2021
 +
[[File:20211008 lab-nokia-cvx-containerlab.zip|ohne|mini]]
 +
<u>If you want to exchange about that lab, those topics, please don't hesitate to contact us</u>
  
 
= SONiC Lab =
 
= SONiC Lab =

Revision as of 08:41, 29 October 2021

Nesevo-labs-v2.png

Nokia/Cumulus Multi-Vendor Lab

The targets of this lab are to :

  • mix Nokia SR-Linux and Cumulus VXLAN nodes, in spine or leaf roles
  • make this environment work for different kinds of setup : cross-DC L2, differentiated L3 gateways per leaf per VRF, anycast gateway cross or intra DC, etc.
  • spot compatibility issues if existing

To reach those goals, we'll use the Nokia lab tool "containerlab" https://containerlab.srlinux.dev/, labs from https://clabs.netdevops.me/ helped a lot. Many thanks to the contributors.

We'll need a Linux host with Docker installed on it + kvm virtualization enhancements activated (important if your host is a VM). If virtualization optimization is not ok, you won't be able to launch the most of devices.

Installation details are referenced there : https://containerlab.srlinux.dev/install/

Once installed, you'll need to register the different NOS images you'll use. Cumulus image is present on a public registrery, but Nokia/Arista/Juniper are not, you'll need a vendor support account to retreive them. Once downloaded (.tgz file typically) you can "docker load" the image :

For private images :

sudo docker load -i 21.6.1-235.tar.xz	      /* (Nokia)  */
sudo docker load -i cEOS64-lab-4.26.1F.tar    /* (Arista) */

For public images :

sudo docker pull networkop/cx:4.3.0     /* (Cumulus) */

To verify your installed images, you can run "sudo docker images"

plancastre@containerlab:~/00.LAB/senss$ sudo docker images
REPOSITORY                        TAG          IMAGE ID       CREATED        SIZE
networkop/cx                      4.3.0        a40541ed15ba   2 weeks ago    733MB
srlinux                           21.6.1-235   e29aed30e83f   3 weeks ago    1.14GB
networkop/ignite                  dev          dcc5eff29355   4 weeks ago    37.9MB
networkop/kernel                  4.19         e794d8875f83   3 months ago   88MB
frrouting/frr                     v7.5.1       c3e13a4c5918   3 months ago   123MB

Once you've got all your images, to run the lab, you'll need a .yml file defining the topology to run.

In our lab, we've started with the 5-clos lab file from Nokia site, which we've forked.

We can see there is a branch "kinds" where we can define templates of nodes, in order to not rewrite whole parameters when creating nodes. For the images, it's important to take the repository name + tag.

Note: If the tag is "latest" it is not needed.

All supported "kinds" are referenced there : https://containerlab.srlinux.dev/manual/kinds/kinds/

Note: yml is indentation sensitive, so please respect the "double space" used to define hierarchy. Below the lab diagram + the yml file associated

Infos on nodes

L3 infos

Device OS ASN VTEP IP swp1 or eth1/1 swp2 or eth1/2 swp3 or eth1/3 SVI
client1 Linux <none> <none> vlan100: 192.168.1.1/24

vlan200: 192.168.2.1/24

route 192.168.200.0/24 via 192.168.2.254

<none> <none> <none>
client2 Linux <none> <none> vlan100: 192.168.1.2/24

vlan200: 192.168.2.2/24

route 192.168.200.0/24 via 192.168.2.254

<none> <none> <none>
client3 Linux <none> <none> vlan100: 192.168.1.3/24

vlan200: 192.168.200.1/24

route 192.168.2.0/24 via 192.168.200.254

<none> <none> <none>
client4 Linux <none> <none> vlan100: 192.168.1.3/24

vlan200: 192.168.200.2/24

route 192.168.2.0/24 via 192.168.200.254

<none> <none> <none>
leaf1 CVX 65011 10.255.255.5/32 10.254.254.8/31 10.254.254.10/31 trunk vlan 100,200 vlan200 : 192.168.2.254/24
leaf2 SRLinux 65012 10.255.255.6/32 10.254.254.12/31 10.254.254.14/31 trunk vlan 100,200 irb0.200 : 192.168.2.254/24
leaf3 CVX 65013 10.255.255.7/32 10.254.254.22/31 10.254.254.24/31 trunk vlan 100,200 vlan200 : 192.168.200.254/24
leaf4 SRLinux 65014 10.255.255.8/32 10.254.254.26/31 10.254.254.28/31 trunk vlan 100,200 irb0.200 : 192.168.200.254/24
spine1 CVX 65001 10.255.255.1/32 10.254.254.9/31 10.254.254.13/31 10.254.254.0/31 <none>
spine2 CVX 65001 10.255.255.2/32 10.254.254.11/31 10.254.254.15/31 10.254.254.16/31 <none>
spine3 SRLinux 65002 10.255.255.3/32 10.254.254.23/31 10.254.254.27/31 10.254.254.18/31 <none>
spine4 SRLinux 65002 10.255.255.4/32 10.254.254.25/31 10.254.254.29/31 10.254.254.20/31 <none>
superspine1 CVX 65003 10.255.255.9/32 10.254.254.1/31 10.254.254.19/31 <none> <none>
superspine2 SRLinux 65003 10.255.255.10/32 10.254.254.17/31 10.254.254.21/31 <none> <none>

VXLAN/BGP infos

Note : in our lab, route-distinguisher is constructed on the model <loopback_ip>:<vlan_id>

service vlan id route-target VNI Commentaires
L2 cross-DC 100 target:65000:100 100 the 4 clients are in the same broadcast domain / subnet
L3VPN cros-DC 200 target:65000:200

target:65000:10200

200 (for L2)

10200 (for routing)

the 4 clients are separated in 2 different subnets. Traffic is routed within dedicated VNI

To be noted that in the current setup VMTO is not implemented, so cross DC traffic is not optimized.

Lab diagram

mini

yml lab file

# topology documentation: http://containerlab.srlinux.dev/lab-examples/min-5clos/
name: lab-srl-cum 

topology:
  kinds:
    srl:
      image: srlinux:21.6.1-235 
    linux:
      image: ghcr.io/hellt/network-multitool
    cvx:
      image: networkop/cx:4.3.0
      runtime: docker
  nodes:
    leaf1:
      kind: cvx
    leaf2:
      kind: srl
      type: ixrd2
    leaf3:
      kind: cvx
    leaf4:
      kind: srl
      type: ixrd2

    spine1:
      kind: cvx
    spine2:
      kind: cvx
    spine3:
      kind: srl
      type: ixr6
    spine4:
      kind: srl
      type: ixr6

    superspine1:
      kind: cvx
    superspine2:
      kind: srl
      type: ixr6

    client1:
      kind: linux
    client2:
      kind: linux
    client3:
      kind: linux
    client4:
      kind: linux

  links:
    # leaf to spine links POD1
    - endpoints: ["leaf1:swp1", "spine1:swp1"]
    - endpoints: ["leaf1:swp2", "spine2:swp1"]
    - endpoints: ["leaf2:e1-1", "spine1:swp2"]
    - endpoints: ["leaf2:e1-2", "spine2:swp2"]

    # spine to superspine links POD1
    - endpoints: ["spine1:swp3", "superspine1:swp1"]
    - endpoints: ["spine2:swp3", "superspine2:e1-1"]

    # leaf to spine links POD2
    - endpoints: ["leaf3:swp1", "spine3:e1-1"]
    - endpoints: ["leaf3:swp2", "spine4:e1-1"]
    - endpoints: ["leaf4:e1-1", "spine3:e1-2"]
    - endpoints: ["leaf4:e1-2", "spine4:e1-2"]

    # spine to superspine links POD2
    - endpoints: ["spine3:e1-3", "superspine1:swp2"]
    - endpoints: ["spine4:e1-3", "superspine2:e1-2"]

    # client connection links
    - endpoints: ["client1:eth1", "leaf1:swp3"]
    - endpoints: ["client2:eth1", "leaf2:e1-3"]
    - endpoints: ["client3:eth1", "leaf3:swp3"]
    - endpoints: ["client4:eth1", "leaf4:e1-3"]

Once the nodes are defined, we have to define the needed connections between the nodes.

Each endpoint is defined as ''<node_name>:<interface_name>''

When all is ok, you can launch in suduoer the topology.

For example :

sudo containerlab deploy --topo topo.clab.yml --reconfigure

Note: The option "reconfigure" is used there in order to not have to destroy instances when updating topology/relaunching.

Another info regarding the yml file, it's possible to quickly generate files with the "containerlab gen -n 3tier --nodes 4,2,1" command for example. https://containerlab.srlinux.dev/cmd/generate/

To be noted that the "tier-x" notion in containerlab is inversed regarding the rfc 7938 (tier1 is superspine level into the rfc, tier1 is leaf level in nokia tool)

At the end of the topology launch, you can retreive the details :

INFO[0011] Writing /etc/hosts file                      
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+
| #  |             Name             | Container ID |              Image              | Kind  | Group |  State  |  IPv4 Address   |     IPv6 Address     |
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+
|  1 | clab-lab-srl-cum-client1     | 25e2bbf6b13f | ghcr.io/hellt/network-multitool | linux |       | running | 172.20.20.2/24  | 2001:172:20:20::2/64 |
|  2 | clab-lab-srl-cum-client2     | 17d82d5a6e21 | ghcr.io/hellt/network-multitool | linux |       | running | 172.20.20.4/24  | 2001:172:20:20::4/64 |
|  3 | clab-lab-srl-cum-client3     | f8d78527c1b1 | ghcr.io/hellt/network-multitool | linux |       | running | 172.20.20.6/24  | 2001:172:20:20::6/64 |
|  4 | clab-lab-srl-cum-client4     | 913a0172d0c5 | ghcr.io/hellt/network-multitool | linux |       | running | 172.20.20.10/24 | 2001:172:20:20::a/64 |
|  5 | clab-lab-srl-cum-leaf1       | 9ffc334af2b1 | networkop/cx:4.3.0              | cvx   |       | running | 172.20.20.9/24  | 2001:172:20:20::9/64 |
|  6 | clab-lab-srl-cum-leaf2       | 7d3eb855d749 | srlinux:21.6.1-235              | srl   |       | running | 172.20.20.14/24 | 2001:172:20:20::e/64 |
|  7 | clab-lab-srl-cum-leaf3       | e0d36ffc606a | networkop/cx:4.3.0              | cvx   |       | running | 172.20.20.7/24  | 2001:172:20:20::7/64 |
|  8 | clab-lab-srl-cum-leaf4       | e6753b1d099e | srlinux:21.6.1-235              | srl   |       | running | 172.20.20.12/24 | 2001:172:20:20::c/64 |
|  9 | clab-lab-srl-cum-spine1      | a7e63993d052 | networkop/cx:4.3.0              | cvx   |       | running | 172.20.20.5/24  | 2001:172:20:20::5/64 |
| 10 | clab-lab-srl-cum-spine2      | 3124250d5b75 | networkop/cx:4.3.0              | cvx   |       | running | 172.20.20.3/24  | 2001:172:20:20::3/64 |
| 11 | clab-lab-srl-cum-spine3      | 5e300ca3f66f | srlinux:21.6.1-235              | srl   |       | running | 172.20.20.11/24 | 2001:172:20:20::b/64 |
| 12 | clab-lab-srl-cum-spine4      | 0a59e60a596b | srlinux:21.6.1-235              | srl   |       | running | 172.20.20.13/24 | 2001:172:20:20::d/64 |
| 13 | clab-lab-srl-cum-superspine1 | 3d9935413fc2 | networkop/cx:4.3.0              | cvx   |       | running | 172.20.20.8/24  | 2001:172:20:20::8/64 |
| 14 | clab-lab-srl-cum-superspine2 | 5bc58d423e2c | srlinux:21.6.1-235              | srl   |       | running | 172.20.20.15/24 | 2001:172:20:20::f/64 |
+----+------------------------------+--------------+---------------------------------+-------+-------+---------+-----------------+----------------------+

The containerlab program creates the updates into the host file + generates an ansible inventory file.

There are different ways to connect onto the docker instances, within docker exec commands or SSH directly the IP address related above.

For example :

sudo docker exec -it clab-lab-srl-cum-spine1 bash

-->>> allows to launch a bash on the cumulus device (then you run the different net commands)

sudo docker exec -it clab-lab-srl-cum-leaf2 sr_cli

-->>> allows to launch the cli on a SRLinux device


To end this setup preparation, the containerlab tool integrates an option to launch a webserver showing the lab topology in graph + node details

By default, it's listening on port 50080 of the host

Then, you can access to the following web page showing the topology + lab infos mini


Finally, if you want to stop a lab, please run ''containerlab destroy --topo <topology>.yml''

At this step, nodes are running, connections are done, but configurations are empty.

So, it's time to configure them :)

Configuration files are attached to this blog. Once validated, they are exportable and can be called by the tool when launching the lab. Below how to do it :

Firstable, once you ve finished your "hand made config", you can run the following command to save it :

containerlab save -t quickstart.clab.yml

To be noted it's only working for Nokia nodes in this lab. CVX configurations will have to be called by another method (or pushed manually)

It will create one folder per node into the lab folder which gives the following tree : mini


Note: For Cumulus, you can apparently retrieve configurations files within adding the following parameters into lab config file. To be tested. some lab samples here : https://github.com/hellt/clabs/blob/main/labs/cvx04/symm-mh.clab.yml


Now we have the lab running, below the different commands to check that all is working as expected : 

-------------------------------------------
Check L2 tables ///
-------------------------------------------

Nokia :

	A:leaf2# show network-instance mac-vrf-100 bridge-table mac-table all                                                                                     
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	Mac-table of network instance mac-vrf-100
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	+--------------------+-----------------------------------------+------------+-------------+---------+--------+-----------------------------------------+
	|      Address       |               Destination               | Dest Index |    Type     | Active  | Aging  |               Last Update               |
	+====================+=========================================+============+=============+=========+========+=========================================+
	| AA:C1:AB:0C:60:D6  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T13:06:17.000Z                |
	|                    | vtep:10.255.255.8 vni:100               | 67         |             |         |        |                                         |
	| AA:C1:AB:23:31:04  | ethernet-1/3.100                        | 2          | learnt      | true    | 300    | 2021-10-08T13:06:10.000Z                |
	| AA:C1:AB:4B:FF:71  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T12:55:28.000Z                |
	|                    | vtep:10.255.255.5 vni:100               | 60         |             |         |        |                                         |
	| AA:C1:AB:B5:79:50  | vxlan-interface:vxlan1.100              | 6379518792 | evpn        | true    | N/A    | 2021-10-08T12:43:37.000Z                |
	|                    | vtep:10.255.255.7 vni:100               | 64         |             |         |        |                                         |
	+--------------------+-----------------------------------------+------------+-------------+---------+--------+-----------------------------------------+
	Total Irb Macs            :    0 Total    0 Active
	Total Static Macs         :    0 Total    0 Active
	Total Duplicate Macs      :    0 Total    0 Active
	Total Learnt Macs         :    1 Total    1 Active
	Total Evpn Macs           :    3 Total    3 Active
	Total Evpn static Macs    :    0 Total    0 Active
	Total Irb anycast Macs    :    0 Total    0 Active
	Total Macs                :    4 Total    4 Active
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	--{ + running }--[  ]--                     

Note : type learnt matches the local learnt mac, evpn are learnt within VXLAN                                                    
	
Cumulus :

	root@leaf1-cum-dc1:/# net show bridge macs vlan 100
	
	VLAN  Master  Interface  MAC                TunnelDest  State      Flags         LastSeen
	----  ------  ---------  -----------------  ----------  ---------  ------------  --------
	 100  bridge  swp3       aa:c1:ab:4b:ff:71                                       00:00:02
	 100  bridge  swp3       aa:c1:ab:4f:f2:e7              permanent                02:17:21
	 100  bridge  vni100     22:2d:67:f1:bb:26              permanent                02:17:21
	 100  bridge  vni100     aa:c1:ab:0c:60:d6                         extern_learn  <1 sec
	 100  bridge  vni100     aa:c1:ab:23:31:04                         extern_learn  00:00:07
	 100  bridge  vni100     aa:c1:ab:b5:79:50                         extern_learn  00:13:28

	root@leaf1-cum-dc1:/# net show bridge macs vlan 200
	
	VLAN  Master  Interface  MAC                TunnelDest  State      Flags         LastSeen
	----  ------  ---------  -----------------  ----------  ---------  ------------  --------
	 200  bridge  swp3       aa:c1:ab:4b:ff:71                                       00:08:46
	 200  bridge  swp3       aa:c1:ab:4f:f2:e7              permanent                02:16:36
	 200  bridge  vni200     00:00:5e:00:01:01              static     sticky        00:14:26
	 200  bridge  vni200     1e:0d:aa:46:53:b1              permanent                02:16:36
	 200  bridge  vni200     02:77:6b:ff:00:41              static     sticky        01:00:52
	 200  bridge  vni200     02:f8:b8:ff:00:41              static     sticky        00:14:26
	 200  bridge  vni200     aa:c1:ab:b5:79:50                         extern_learn  00:11:51
	 200  bridge  vni10200   02:77:6b:ff:00:00                         extern_learn  00:53:02
	 200  bridge  vni10200   02:f8:b8:ff:00:00                         extern_learn  00:14:26
	 200  bridge  vni10200   86:5e:aa:ca:50:be              permanent                02:16:36
	

Note : the macs with permanent flag are local interfaces, physical ou logic (vtep)
Note2 : extern_learn mac are the one learned via the VXLAN infra (and mapped to the vnixxx interface)

-------------------------------------------
Check arp tables  ///
-------------------------------------------

Nokia :

	:leaf2# show arpnd arp-entries                                                                                                                           
	+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
	|   Interface   | Subinterface  |    Neighbor     |    Origin     |     Link layer address      |                         Expiry                          |
	+===============+===============+=================+===============+=============================+=========================================================+
	| ethernet-1/1  |             0 |   10.254.254.13 |       dynamic | AA:C1:AB:59:65:EA           | 3 hours from now                                        |
	| ethernet-1/2  |             0 |   10.254.254.15 |       dynamic | AA:C1:AB:CB:F8:8A           | 3 hours from now                                        |
	| irb0          |           200 |     192.168.2.1 |          evpn | AA:C1:AB:4B:FF:71           |                                                         |
	| irb0          |           200 |     192.168.2.2 |       dynamic | AA:C1:AB:23:31:04           | 3 hours from now                                        |
	| mgmt0         |             0 |     172.20.20.1 |       dynamic | 02:42:63:9E:74:03           | 2 hours from now                                        |
	+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	  Total entries : 5 (0 static, 5 dynamic)
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	--{ + running }--[  ]--                                                                                       
	
Note : on Nokia you have to sort the entries basing on subinterface and the retrieve the L3VPN attached	

	A:leaf2# show arpnd arp-entries subinterface 200                                                                                                          
	+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
	|   Interface   | Subinterface  |    Neighbor     |    Origin     |     Link layer address      |                         Expiry                          |
	+===============+===============+=================+===============+=============================+=========================================================+
	| irb0          |           200 |     192.168.2.1 |          evpn | AA:C1:AB:4B:FF:71           |                                                         |
	| irb0          |           200 |     192.168.2.2 |       dynamic | AA:C1:AB:23:31:04           | 3 hours from now                                        |
	+---------------+---------------+-----------------+---------------+-----------------------------+---------------------------------------------------------+
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	  Total entries : 2 (0 static, 2 dynamic)
	----------------------------------------------------------------------------------------------------------------------------------------------------------
	--{ + running }--[  ]--                                            

Cumulus :

Here we retrieve all arp infos linked to evpn

	root@leaf1-cum-dc1:/# net show evpn arp-cache vni all
	VNI 100 #ARP (IPv4 and IPv6, local and remote) 2
	
	Flags: I=local-inactive, P=peer-active, X=peer-proxy
	Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
	192.168.1.3     remote       active   aa:c1:ab:b5:79:50 10.255.255.7                   0/0
	192.168.1.1     local        active   aa:c1:ab:4b:ff:71                                0/0
	
	VNI 200 #ARP (IPv4 and IPv6, local and remote) 4
	
	Flags: I=local-inactive, P=peer-active, X=peer-proxy
	Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
	192.168.2.1     local        active   aa:c1:ab:4b:ff:71                                0/0
	192.168.200.254 remote       active   00:00:5e:00:01:01 10.255.255.8                   0/0
	192.168.2.254   remote       active   00:00:5e:00:01:01 10.255.255.6                   0/0
	192.168.200.1   remote       active   aa:c1:ab:b5:79:50 10.255.255.7                   0/0
	
	VNI 400 #ARP (IPv4 and IPv6, local and remote) 0

	

-------------------------------------------
Check bgp sessions' status - underlay ///
-------------------------------------------

Nokia :

	A:spine3# show network-instance default protocols bgp neighbor | grep ipv4                                                                                                                                                                                                                                             
	| default     | 10.254.254.19  | udl-superspine          | S         | 65003           | established      | 0d:0h:22m:44s    | ipv4-unicast          | [13/4/4]       |
	| default     | 10.254.254.22  | udl-leaf    			 | S         | 65013           | established      | 0d:0h:22m:52s    | ipv4-unicast          | [13/1/4]       |


Cumulus : 


	root@leaf3:/# net show bgp ipv4 unicast summary
	BGP router identifier 10.255.255.7, local AS number 65013 vrf-id 0
	BGP table version 13
	RIB entries 25, using 4800 bytes of memory
	Peers 2, using 43 KiB of memory
	
	Neighbor        V         AS   MsgRcvd   MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd   PfxSnt
	10.254.254.23   4      65002       466       403        0    0    0 00:19:34            4       13
	10.254.254.25   4      65002       434       355        0    0    0 00:17:10            8       13

-------------------------------------------
Check bgp sessions' status - overlay ///
-------------------------------------------

Nokia :

	A:spine3# show network-instance default protocols bgp neighbor | grep evpn                                                                                                                                                                                                                                             
	| default  | 10.255.255.7    | ovl-leaf            | S         | 65013           | established  | 0d:0h:24m:14s| evpn      | [15/0/11]  |
	| default  | 10.255.255.9    | ovl-superspine      | S         | 65003           | established  | 0d:0h:24m:7s | evpn      | [11/0/4]   |

Cumulus :

	root@leaf3-cum-dc1:/# net show bgp evpn summary
	BGP router identifier 10.255.255.7, local AS number 65013 vrf-id 0
	BGP table version 0
	RIB entries 29, using 5568 bytes of memory
	Peers 2, using 43 KiB of memory
	
	Neighbor        V         AS   MsgRcvd   MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd   PfxSnt
	10.255.255.3    4      65002      5618      4742        0    0    0 03:53:35           19       27
	10.255.255.4    4      65002      5565      4694        0    0    0 03:51:11           19       27


-------------------------------------------
Check EVPN L2 tables///
-------------------------------------------

Nokia :

<didn't spotted how to show evpn routes in a bgp fashion>

Cumulus :

root@leaf3-cum-dc1:/# net show bgp evpn route type 2
BGP table version is 17, local router ID is 10.255.255.7
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]

   Network          Next Hop            Metric LocPrf Weight Path
                    Extended Community
Route Distinguisher: 10.255.255.5:100
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
Route Distinguisher: 10.255.255.5:200
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.2.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.2.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:200 RT:65011:10200 ET:8 Rmac:aa:c1:ab:4f:f2:e7
Route Distinguisher: 10.255.255.6:200
*  [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.2.254]
                    10.255.255.6                           0 65002 65003 65001 65012 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*> [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.2.254]
                    10.255.255.6                           0 65002 65003 65001 65012 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*  [2]:[0]:[48]:[02:77:6b:ff:00:41]
                    10.255.255.6                           0 65002 65003 65001 65012 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*> [2]:[0]:[48]:[02:77:6b:ff:00:41]
                    10.255.255.6                           0 65002 65003 65001 65012 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
Route Distinguisher: 10.255.255.7:100
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:100
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.1.3]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:100
Route Distinguisher: 10.255.255.7:200
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:200
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.200.1]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:200
Route Distinguisher: 10.255.255.8:200
*  [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.200.254]
                    10.255.255.8                           0 65002 65014 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*> [2]:[0]:[48]:[00:00:5e:00:01:01]:[32]:[192.168.200.254]
                    10.255.255.8                           0 65002 65014 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*  [2]:[0]:[48]:[02:f8:b8:ff:00:41]
                    10.255.255.8                           0 65002 65014 i
                    RT:65000:200 ET:8 MM:0, sticky MAC
*> [2]:[0]:[48]:[02:f8:b8:ff:00:41]
                    10.255.255.8                           0 65002 65014 i
                    RT:65000:200 ET:8 MM:0, sticky MAC


and if we focus on our vni 100

root@leaf3-cum-dc1:/# net show bgp evpn route vni 100 type 2     
BGP table version is 48, local router ID is 10.255.255.7
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]

   Network          Next Hop            Metric LocPrf Weight Path
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*  [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*> [2]:[0]:[48]:[aa:c1:ab:4b:ff:71]:[32]:[192.168.1.1]
                    10.255.255.5                           0 65002 65003 65001 65011 i
                    RT:65000:100 ET:8
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:100
*> [2]:[0]:[48]:[aa:c1:ab:b5:79:50]:[32]:[192.168.1.3]
                    10.255.255.7                       32768 i
                    ET:8 RT:65000:100


The additional route type "MAC+IP" is optional and is useful/mandatory when you do anycast irb.


-------------------------------------------
Check tables EVPN L3 ///
-------------------------------------------

Nokia :

--{ + running }--[  ]--                                                                                                                                    
A:leaf2# show network-instance ip-vrf-200 route-table all                                                                                                  
-----------------------------------------------------------------------------------------------------------------------------------------------------------
IPv4 Unicast route table of network instance ip-vrf-200
-----------------------------------------------------------------------------------------------------------------------------------------------------------
+-----------------------+-------+------------+----------------------+----------------------+----------+---------+--------------+--------------+
|        Prefix         |  ID   | Route Type |     Route Owner      |      Best/Fib-       |  Metric  |  Pref   |   Next-hop   |   Next-hop   |
|                       |       |            |                      |     status(slot)     |          |         |    (Type)    |  Interface   |
+=======================+=======+============+======================+======================+==========+=========+==============+==============+
| 192.168.2.0/24        | 9     | local      | net_inst_mgr         | True/success         | 0        | 0       | 192.168.2.25 | irb0.200     |
|                       |       |            |                      |                      |          |         | 4 (direct)   |              |
| 192.168.2.254/32      | 9     | host       | net_inst_mgr         | True/success         | 0        | 0       | None         | None         |
|                       |       |            |                      |                      |          |         | (extract)    |              |
| 192.168.2.255/32      | 9     | host       | net_inst_mgr         | True/success         | 0        | 0       | None         | None         |
|                       |       |            |                      |                      |          |         | (broadcast)  |              |
| 192.168.200.0/24      | 0     | bgp-evpn   | bgp_evpn_mgr         | True/success         | 0        | 170     | 10.255.255.8 | None         |
|                       |       |            |                      |                      |          |         | (indirect/vx |              |
|                       |       |            |                      |                      |          |         | lan)         |              |
+-----------------------+-------+------------+----------------------+----------------------+----------+---------+--------------+--------------+
-----------------------------------------------------------------------------------------------------------------------------------------------------------
4 IPv4 routes total
4 IPv4 prefixes with active routes
0 IPv4 prefixes with active ECMP routes
-----------------------------------------------------------------------------------------------------------------------------------------------------------
--{ + running }--[  ]--                                                                                                                                    
A:leaf2#

<didn't spotted how to show evpn routes in a bgp fashion>

Cumulus :

root@leaf1-cum-dc1:/# net show route vrf ip-vrf-200
show ip route vrf ip-vrf-200 
=============================
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure

VRF ip-vrf-200:
K>* 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 04:48:42
B   192.168.2.0/24 [20/0] via 10.255.255.6, vlan200 onlink, weight 1, 04:27:26
C>* 192.168.2.0/24 is directly connected, vlan200, 04:48:42
B>* 192.168.200.0/24 [20/0] via 10.255.255.8, vlan200 onlink, weight 1, 03:48:49


root@leaf1-cum-dc1:/# net show bgp evpn route type 5
BGP table version is 3, local router ID is 10.255.255.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP]

   Network          Next Hop            Metric LocPrf Weight Path
                    Extended Community
Route Distinguisher: 10.255.255.6:10200
*  [5]:[0]:[24]:[192.168.2.0]
                    10.255.255.6                           0 65001 65012 i
                    RT:65000:10200 ET:8 Rmac:02:77:6b:ff:00:00
*> [5]:[0]:[24]:[192.168.2.0]
                    10.255.255.6                           0 65001 65012 i
                    RT:65000:10200 ET:8 Rmac:02:77:6b:ff:00:00
Route Distinguisher: 10.255.255.8:10200
*> [5]:[0]:[24]:[192.168.200.0]
                    10.255.255.8                           0 65001 65003 65002 65014 i
                    RT:65000:10200 ET:8 Rmac:02:f8:b8:ff:00:00


-------------------------------------------
Check arp hosts ///
-------------------------------------------

From client #1 /


	bash-5.0# arp 
	Address                  HWtype  HWaddress           Flags Mask            Iface
	192.168.1.3              ether   aa:c1:ab:b5:79:50   C                     eth1.100
	192.168.1.4              ether   aa:c1:ab:0c:60:d6   C                     eth1.100
	192.168.2.2              ether   aa:c1:ab:23:31:04   C                     eth1.200
	192.168.2.254            ether   aa:c1:ab:4f:f2:e7   C                     eth1.200
	192.168.1.2              ether   aa:c1:ab:23:31:04   C                     eth1.100
	containerlab.local       ether   02:42:63:9e:74:03   C                     eth0


-------------------------------------------
Ping ///
-------------------------------------------

From client #1 /

	L2 service ping (vlan 100) ----------------------

		bash-5.0# ping -c 1 192.168.1.2
		PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
		64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=0.812 ms
		
		--- 192.168.1.2 ping statistics ---
		1 packets transmitted, 1 received, 0% packet loss, time 0ms
		rtt min/avg/max/mdev = 0.812/0.812/0.812/0.000 MsgRcvd
		bash-5.0# ping -c 1 192.168.1.3
		PING 192.168.1.3 (192.168.1.3) 56(84) bytes of data.
		64 bytes from 192.168.1.3: icmp_seq=1 ttl=64 time=1.40 ms
		
		--- 192.168.1.3 ping statistics ---
		1 packets transmitted, 1 received, 0% packet loss, time 0ms
		rtt min/avg/max/mdev = 1.403/1.403/1.403/0.000 ms
		bash-5.0# ping -c 1 192.168.1.4
		PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data.
		64 bytes from 192.168.1.4: icmp_seq=1 ttl=64 time=1.62 ms
		
		--- 192.168.1.4 ping statistics ---
		1 packets transmitted, 1 received, 0% packet loss, time 0ms
		rtt min/avg/max/mdev = 1.619/1.619/1.619/0.000 ms

	L3 service ping (vlan 200)

		bash-5.0# ping -c 1 192.168.2.1
		PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data.
		64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=0.053 ms
		
		--- 192.168.2.1 ping statistics ---
		1 packets transmitted, 1 received, 0% packet loss, time 1ms
		rtt min/avg/max/mdev = 0.053/0.053/0.053/0.000 ms
		bash-5.0# ^C
		bash-5.0# ping -c 1 192.168.2.2
		PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data.
		64 bytes from 192.168.2.2: icmp_seq=1 ttl=64 time=0.611 ms
		
		--- 192.168.2.2 ping statistics ---
		1 packets transmitted, 1 received, 0% packet loss, time 0ms
		rtt min/avg/max/mdev = 0.611/0.611/0.611/0.000 ms


-------------------------------------------
Traceroute ///
-------------------------------------------

	L3 service traceroute (vlan 200)

		bash-5.0# traceroute 192.168.200.1
		traceroute to 192.168.200.1 (192.168.200.1), 30 hops max, 46 byte packets
		 1  192.168.2.254 (192.168.2.254)  0.012 ms  0.010 ms  0.007 ms
		 2  192.168.200.254 (192.168.200.254)  2.751 ms  *  2.549 ms
		 3  192.168.200.1 (192.168.200.1)  2.084 ms  1.805 ms  1.761 ms

To come back on the setup, we wanted to implement solutions inspired by the RFC 7938 rfc7938  (see section 5.2.1)

  • eBGP will be used for Underlay and Overlay
  • eBGP single-hop sessions are established over direct point-to-point links interconnecting the network nodes, no multi-hop or loopback sessions are used, even in the case of multiple links between the same pair of nodes.
  • Private Use ASNs from the range 64512-65534 are used to avoid ASN conflicts.
  • A single ASN is allocated to all of the Clos topology's Tier 1 devices.
  • A unique ASN is allocated to each set of Tier 2 devices in the same cluster.
  • A unique ASN is allocated to every Tier 3 device (e.g., ToR) in this topology.

In add, depending of network nodes, it will be interesting to :

  • Add fast-failover option for underlay + add link-debounce on links to limit possible impacts in case of link flaps. BFD could be considered in some cases
  • Have the best ECMP hashing algorythm on leaf nodes. On tier-1/tier-2 levels hashing will be based on underlay part (trafic inter-vtep), so L3-L4 decision, but some models can retreive the vni-id if I well remember.
  • Implement the "multipath relax" since we could have multiple AS paths for a same destination.
  • Implement gshut community on underlay (on tier-1/tier-2) or at least policies to prepend underlay routes to avoid some nodes in case of maintenance.

Thoughts/Points to deepend

On leaf nodes, LACP over multiple nodes is feasible within ESI, but impact on incidents/maintenance can vary depending on the vendors.

Tests need to be done to check that.

Some sysadmin would like to KISS and have client servers connected in active/passive bonding, with eventually single-leaf ports aggregation.

Note : NH ESI in FIB management on ingress nodes can have some limitations (numbers of installable next-hop, load-balancing, etc. oftenly linked to the node chipset)


Another important engineering point to define at the beginning is : Do we authorize multisite L2 propagation or not ?

From my point-of-view, the smaller are the L2 segments the better it is. I would suggest Local L2 segments wit anycast gateways provided by Leaf switches, with L3 routing between DCs within EVPN type5 routes sharing only. Nevertheless, some business requirements for endcustomers can keep extended L2 alive.

We have to be careful when implementing Consistent hashing. ex: https://docs.nvidia.com/networking-ethernet-software/cumulus-linux-44/Layer-3/Routing/Equal-Cost-Multipath-Load-Sharing-Hardware-ECMP/

If possible activate it per VRF, not globally, and restrict on dedicated subnets << depends of the vendor, it can be dangerous regarding memory management


Think at configuring the bgp option to not advertise routes to peers before they are installed in FIB.


We can implement leaf roles in some cases, to be able to do "light traffic engineering " on DCI links in some setup.

These roles will be managed within bgp communities added to VTEP /32. Look at the diagram below. Depending of the colour, the eBGP sessions between SupS will prepend or not the VTEP IPs announced to the remote DC mini

To be contiuned

Lab archives

Reminder : following config are for lab, so please don't pay attention on typos/lack of security params/unused config. Thanks \o/

Credentials

SRLinux : admin/<no_password>

CVX : cumulus/cumulus

Lab archives

layer 2 (vlan 100) + layer 3 (vlan 200) lab, 10/12/2021 mini If you want to exchange about that lab, those topics, please don't hesitate to contact us

SONiC Lab

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