Reference Guide
Local AS
During BGP network migration, you can maintain existing AS numbers. Recongure your routers with the new information to disable after
the migration. Network migration is not supported on passive peer templates. You must congure Peer templates before assigning it to an
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 (up to 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
AS number limit
Sets the number of times an AS number occurs in an AS path. The allow-as parameter permits a BGP speaker to allow the AS number
for a congured number of times in the updates received from the peer.
The AS-PATH loop is detected if the local AS number is present more than the number of times in the command.
1 Enter the neighbor IP address to use the AS path in ROUTER-BGP mode.
neighbor ip address
2 Enter Address Family mode in ROUTER-NEIGHBOR mode.
address-family {[ipv4 | ipv6] [unicast])
3 Allow the neighbor IP address to use the AS path the specied number of times in ROUTER-BGP-NEIGHBOR-AF mode (1 to 10).
allowas-in number
Congure AS number appearance
OS10(config)# router bgp 10
OS10(conf-router-bgp-10)# neighbor 1.1.1.2
210
Layer 3