Dell EMC SmartFabric OS10 User Guide Release 10.5.1

During BGP network migration, you can maintain existing AS numbers. Reconfigure your routers with the new information to disable after the migration. Network migration is not supported on passive peer templates. You must configure Peer templates before assigning it to an AS.

The following options are available with the local-as command:

To append the global-as and local-as in the outbound AS_PATH for the neighbor, use:

local-as as-number

To not add the local-as to prefixes received from the BGP neighbor, use:

local-as as-number no-prepend

To not add the global AS number in the outbound AS_PATH for that neighbor, use:

local-as as-number no-prepend replace-as

1. Enter a neighbor IP address, A.B.C.D, in ROUTER-BGP mode.

   neighbor ip-address

2. Enter a local-as number for the peer, and the AS values not prepended to announcements from the neighbors in ROUTER-NEIGHBOR mode (1 to 4294967295).

   local-as as number [no prepend]

3. Return to ROUTER-BGP mode.

   exit

4. Enter a template name to assign to the peer-groups in ROUTER-BGP mode. A maximum of 16 characters.

   template template-name

5. Enter a local-as number for the peer in ROUTER-TEMPLATE mode.

   local-as as number [no prepend]

6. Add a remote AS in ROUTER-TEMPLATE mode (1 to 65535 for 2 bytes, 1 to 4294967295 for 4 bytes).

   remote-as as-number

Allow external routes from neighbor

OS10(config)# router bgp 10
OS10(conf-router-bgp-10)# neighbor 32.1.1.2
OS10(conf-router-neighbor)# local-as 50
OS10(conf-router-neighbor)# exit
OS10(conf-router-bgp-10)# template bgppg1
OS10(conf-router-template)# fall-over
OS10(conf-router-template)# local-as 400
OS10(conf-router-template)# remote-as 102 

Local AS number disabled

OS10(config)# router bgp 102
OS10(conf-router-bgp-102)# neighbor 32.1.1.2
OS10(conf-router-neighbor)# no local-as 100