210 | Border Gateway Protocol
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Use these commands in the following sequence, starting in the CONFIGURATION ROUTER BGP mode
to configure passive peering.
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 203.
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.
Step Command Syntax Command Mode Purpose
1 neighbor peer-group-name
peer-group passive limit
CONFIG-ROUTER-BGP Configure a peer group that does not initiate TCP
connections with other peers. Enter the limit
keyword to restrict the number of sessions
accepted.
2
neighbor peer-group-name
subnet subnet-number
mask
CONFIG-ROUTER-BGP Assign a subnet to the peer group. The peer
group will respond to OPEN messages sent on
this subnet.
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 for 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.
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