Configure Listen Limit on BGP Dynamic Peer

EFA supports configuration of global router bgp listen-limit through EFA depending on the router bgp dynamic peer scale requirements.

Listen-limit configuration defined under the “global router bgp” context denotes the maximum number of dynamic BGP peers that can be operational (and not configured) across the VRFs in the SLX. Default value of the global router bgp listen-limit is 100, and can be modified with any value in the range of 1-255.

Listen-limit configuration defined at the “dynamic peer listen-range” level must be less than or equal to the “listen-limit” configuration defined under the “global router bgp”.

Pre-2.5.0 versions of EFA do not support configuration of global router bgp listen-limit.

The maximum number of dynamic bgp peers is limited to the SLX default (100), when provisioned through EFA.

You can configure the new fabric setting bgp-dynamic-peer-listen-limit per fabric.

The fabric setting is applicable for CLOS and Small Data Center fabrics, and for all types of devices (leaf, border-leaf, spine, super-spine).

The configured value of bgp-dynamic-peer-listen-limit is configured on all the devices of the fabric during “fabric configure”.

You can configure the bgp-dynamic-peer-listen-limit on an already provisioned fabric. But you must run fabric configure followed by efa fabric setting update for the new value to be effective.

This enables you to configure bgp-dynamic-peer-listen-limit on the existing pre-2.5.0 deployments.

Note

Note

You can only increase (but not decrease) the value of bgp-dynamic-peer-listen-limit on an already provisioned fabric.
  1. Run the following command:
    efa fabric setting update –name <fabric-name> --bgp-dynamic-peer-listen-limit <1-255>
  2. Verify the switch configuration on SLX device.
    Rack1-Device1# show running-config router bgp
    router bgp
     local-as 4200000000
     capability as4-enable
     fast-external-fallover
     listen-limit 200
     neighbor 10.20.20.5 remote-as 4200000000
     neighbor 10.20.20.5 next-hop-self
     address-family ipv4 unicast
      network 172.31.254.139/32
      network 172.31.254.226/32
      maximum-paths 8
      graceful-restart
     !
     address-family ipv6 unicast
     !
     address-family l2vpn evpn
      graceful-restart
     !
    !
    Rack1-Device2# show running-config router bgp
    router bgp
     local-as 4200000000
     capability as4-enable
     fast-external-fallover
     listen-limit 200
     neighbor 10.20.20.4 remote-as 4200000000
     neighbor 10.20.20.4 next-hop-self
     address-family ipv4 unicast
      network 172.31.254.115/32
      network 172.31.254.226/32
      maximum-paths 8
      graceful-restart
     !
     address-family ipv6 unicast
     !
     address-family l2vpn evpn
      graceful-restart
     !
    !