The network device must use its loopback interface address as the source address for all iBGP peering sessions.

From Infrastructure Router Security Technical Implementation Guide

Part of Loopback address is not used as the iBGP source IP.

SV-15357r3_rule The network device must use its loopback interface address as the source address for all iBGP peering sessions.

Vulnerability discussion

Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability. It is easier to construct appropriate filters for control plane traffic. Log information recorded by authentication and syslog servers will record the router's loopback address instead of the numerous physical interface addresses.

Check content

Review the configuration and verify iBGP peering uses the devices loopback interface address as the source address. If the loopback interface isn't being used as the source address for iBGP peering, this is a finding.

Fix text

Configure the network device's loopback address as the source address for iBGP peering.

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