Comprehensive and Detailed Step-by-Step Explanation:
BGP Router ID Behavior:
The router ID uniquely identifies a BGP device in the network.
If the router ID is changed, it is equivalent to creating a new BGP instance, and the existing BGP session is reset to establish a new peer relationship.
Impact of Router ID Change:
BGP peering relies on stable identifiers. Changing the router ID disrupts the TCP session and requires reestablishing the relationship.
[References:, HCIA-Datacom Study Guide, Chapter: BGP Peer Relationships, Huawei BGP Configuration Best Practices, , ]
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