Update bgp-multihop on an Active Fabric

About this task

When you update the bgp-multihop on an active (already configured) fabric followed by the efa fabric configure operation, the ebgp peer-group sessions is reset. This is similar to the procedure followed during the update of md5 password followed by fabric configure.

Note

The fabric setting bgp-multihop is applicable for the non-Clos fabric and not applicable for the Clos fabric.

1. Run the efa fabric setting update command.
   

   efa fabric setting update --bgp-multihop 25 --name fab2

   

   WARNING: configuring/clearing md5-password, configuring bgp-multihop on an active fabric will result in BGP neighbor sessions going down for a brief period when the fabric is reconfigured.
   Please confirm if you want to continue with the fabric setting update [y/n]?
   y
   fab2 Fabric Update Successful
   — Time Elapsed: 6.7189463s —

2. Run the efa fabric show command.
   

   efa fabric show --name fab2
   Fabric Name: fab2, Fabric Description: , Fabric Type: non-clos, Fabric Status: settings-updated
   Updated Fabric Settings: BGP-MULTIHOP

3. Run the efa fabric configure command.
   

   efa fabric configure --name fab2
   WARNING: 'fabric configure' will result in configuration change on the devices which are in 'cfg refreshed' or 'fabric setting refreshed' or 'cfg refresh error' state.
   Please check 'fabric show' to see the 'cfg refreshed' or 'fabric setting refreshed' or 'cfg refresh error' devices. Please confirm if you want to continue with 'fabric configure' [y/n]?
   y
   Validate Fabric [Success]
   Configure Fabric [Success]
   Please verify the fabric physical/underlay topology using 'efa fabric topology show
   {physical | underlay}' before attempting tenant configuration on the fabric.
   — Time Elapsed: 1m0.0693633s —

4. Complete the following configuration on SLX devices:
   

   Freedom-06# show running-config router bgp
   router bgp
   local-as 4200000000
   capability as4-enable
   fast-external-fallover
   neighbor overlay-ebgp-group peer-group
   neighbor overlay-ebgp-group ebgp-multihop 25
   neighbor underlay-ebgp-group peer-group

Example

• The following is an example of efa fabric show command output:
  

  efa fabric show --name fab2
  Fabric Name: fab2, Fabric Description: , Fabric Type: non-clos, Fabric Status: configure-success
  --------------------------------------------------------------------------------------------------------------
  IP ADDRESS	RACK	HOST NAME	ASN     ROLE  DEVICE STATE  APP STATE   CONFIG     PENDING  VTLB LB
                                                                                     GEN REASON CONFIGS  ID   ID
  10.20.246.24  room1-rack2  Freedom-08  4200000001  leaf  provisioned  cfg in-sync    NA	  NA       2   1
  10.20.246.23  room1-rack2  Freedom-07  4200000001  leaf  provisioned  cfg in-sync    NA	  NA       2   1
  10.20.246.21  room1-rack1  Freedom-05  4200000000  leaf  provisioned  cfg in-sync    NA	  NA       2   1
  10.20.246.22  room1-rack1  Freedom-06  4200000000  leaf  provisioned  cfg in-sync    NA	  NA       2   1
  

• The following is an example of SLX configuration before fabric setting update and fabric configure:
  

  Freedom-06# show running-config router bgp
  router bgp
  local-as 4200000000
  capability as4-enable
  fast-external-fallover
  neighbor overlay-ebgp-group peer-group
  neighbor overlay-ebgp-group ebgp-multihop 4

• The following is an example of overlay EBGP session states before the fabric configure:
  

  Neighbor Address AS#        State Time     Rt:Accepted Filtered Sent To Send
  172.31.254.107   4200000001 ESTAB 0h22m47s 0           0        0    0
  172.31.254.116   4200000001 ESTAB 0h23m9s  0           0        0    0

• The following is an example of non-Overlay EBGP Session states before the fabric configure:
  

  Neighbor Address AS#        State Time     Rt:Accepted Filtered Sent To Send
  10.10.10.1       4200000001 ESTAB 0h23m43s 3           0        3    0
  10.20.20.6       4200000000 ESTAB 0h54m25s 2           0        5    0

• The following is an example of overlay EBGP Session states after the fabric configure:
  

  Neighbor Address AS#        State Time    Rt:Accepted Filtered Sent To Send
  172.31.254.107   4200000001 ESTAB 0h0m24s 0           0        0    0
  172.31.254.116   4200000001 ESTAB 0h0m47s 0           0        0    0

• The following is an example of non-Overlay EBGP Session states after the fabric configure:
  

  Neighbor Address AS#        State Time     Rt:Accepted Filtered Sent To Send
  10.10.10.1       4200000001 ESTAB 0h26m13s 3           0        3    0
  10.20.20.6       4200000000 ESTAB 0h56m55s 2           0        5    0