Multiple choice technology

When configuring an IBGP peering session between loopback interfaces, why is the local-address option required?

  1. for VLSM support

  2. for loop prevention

  3. for TCP reachability

  4. for MD5 authentication
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When configuring IBGP peering to loopback addresses, the local-address option is required because the TCP session for BGP uses the loopback address as the source. Without explicitly setting local-address, the router might use a different interface's IP address as the source, which could fail or cause connectivity issues depending on routing. This is not for VLSM support (A), loop prevention (B), or MD5 authentication (D) - those are handled by other mechanisms. The local-address ensures proper TCP source address selection.

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