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Border Gateway Protocol IPv4 (BGPv4) | 239
Only after the peer group responds to an OPEN message sent on the subnet does its BGP state change to
ESTABLISHED. Once the peer group is ESTABLISHED, the peer group is the same as any other peer
group.
For more information on peer groups, refer to Configure Peer Groups on page 232.
Maintain existing AS numbers during an AS migration
The local-as feature smooths out the BGP network migration operation and allows you to maintain
existing ASNs during a BGP network migration.
When you complete your migration, be sure to reconfigure your routers with the new information and
disable this feature.
Disable this feature, using the
no neighbor local-as command in CONFIGURATION ROUTER BGP mode.
3
neighbor peer-group-name no
shutdown
CONFIG-ROUTER-
BGP
Enable the peer group.
4
neighbor peer-group-name
remote-as as-number
CONFIG-ROUTER-
BGP
Create and specify a remote peer as a BGP
neighbor.
Command Syntax Command Mode Purpose
neighbor {IP address |
peer-group-name local-as as
number [no prepend]
CONFIG-ROUTER-
BGP
Allow external routes from this neighbor.
Format:
IP Address: A.B.C.D
Peer Group Name: 16 characters
AS-number: 0-65535 (2-Byte) or 1-4294967295 (4-Byte)
or
0.1-65535.65535 (Dotted format)
No Prepend specifies that local AS values are not
prepended to announcements from the neighbor.
You must Configure Peer Groups before assigning it to an AS.
This feature is not supported on passive peer groups.
Step Command Syntax Command Mode Purpose