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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-66
Consequently, Router B does not need to modify its configuration. Later when AS
3600 reaches an agreement with AS 5750 in terms of management, Router B can
modify the remote AS of Router A to be AS 3600 and Router A deletes the
corresponding local AS for migration of part network in different ASs.
Configuration steps
1, Enter the BGP configuration mode
DES-7200-A(config)# router bgp 3600
2, Configure local AS for the peer
DES-7200-A(config-router)# neighbor 57.50.1.1 local-as 23 no-prepend
replace-as dual-as
3, Delete local AS after Router B modifies its configuration
DES-7200-A(config-router)#no neighbor 57.50.1.1 local-as
Check configuration
The neighbor uses local AS to establish the BGP conneciton.
DES-7200-A#show ip bgp neighbors 57.50.1.1
BGP neighbor is 57.50.1.1, remote AS 5750, local AS 23(using Peer's Local AS,
no-prepend, replace-as, dual-as), external link
BGP version 4, remote router ID 0.0.0.0
BGP state = Idle
Last read , hold time is 180, keepalive interval is 60 seconds
Received 0 messages, 0 notifications, 0 in queue
open message:0 update message:0 keepalive message:0
refresh message:0 dynamic cap:0 notifications:0
Sent 0 messages, 0 notifications, 0 in queue
Detailed configuration:
Router A configuration
router bgp 3600
neighbor 57.50.1.1 remote-as 5750
neighbor 57.50.1.1 local-as 23 no-prepend replace-as dual-as
neighbor 57.50.1.1 update-source loopback 0
neighbor 57.50.1.1 ebgp-multihop 255
Router B configuration
router bgp 5750
neighbor 36.0.1.1 remote-as 23
neighbor 36.0.1.1 update-source loopback 0
neighbor 36.0.1.1 ebgp-multihop 255