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DES-7200 Configuration Guide Chapter 6 BGP
Configuration
6-65
Now there is a need to migrate Router A and the network it belogs to AS 3600.
Logical topology after AS migration
AS 23 and AS 3600 belong to one management domain. The configurations of
these two ASs are modified after negotiation. At this point, Router A configures AS
3600 as the AS of the BGP protocol. In this case, you need to maintain the BGP
connection between Router A and Router B, and modify the corresponding peer
configuration on Router B of AS 5750. For some reasons, Router B will not modify
the configuration immediately. As a result, Router B cannot establish the BGP
connection with Router A. Here on Router A, you can configure local AS for
Router B so as to establish the BGP connection between them wihtout affecting
the transmisison and calculation of routes.
Networking topology
The following figure illustrates how to configure local AS for Router B.
After configuration, there is a virtual AS 23 between Router A and Router B.
Router B considers that it directly connects to AS 23 and transmits routes to it.