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


Overview

Finding ID Version Rule ID IA Controls Severity
V-14681 NET0903 SV-15359r2_rule Low
Description
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.
STIG Date
Perimeter Router Security Technical Implementation Guide Cisco 2018-11-28

Details

Check Text ( C-12826r2_chk )
Verify that the peering session with iBGP neighbors use the loopback address as the source address as shown in the example below:

interface loopback 0
ip address 10.10.2.1 255.255.255.255

router bgp 100
neighbor 200.200.200.2 remote-as 200
neighbor 188.20.120.2 remote-as 144
neighbor 10.10.2.2 remote-as 100
neighbor 10.10.2.2 update-source Loopback0
neighbor 10.10.2.3 remote-as 100
neighbor 10.10.2.3 update-source Loopback0
Fix Text (F-14148r3_fix)
Configure the network device's loopback address as the source address for iBGP peering.