The Cisco Multicast Source Discovery Protocol (MSDP) router must be configured to use a loopback address as the source address when originating MSDP traffic.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-97039	CISC-RT-000950	SV-106177r1_rule		Low

Description
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of MSDP routers. It is easier to construct appropriate ingress filters for router management plane traffic destined to the network management subnet since the source addresses will be from the range used for loopback interfaces instead of a larger range of addresses used for physical interfaces. Log information recorded by authentication and syslog servers will record the router’s loopback address instead of the numerous physical interface addresses.

Description

Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of MSDP routers. It is easier to construct appropriate ingress filters for router management plane traffic destined to the network management subnet since the source addresses will be from the range used for loopback interfaces instead of a larger range of addresses used for physical interfaces. Log information recorded by authentication and syslog servers will record the router’s loopback address instead of the numerous physical interface addresses.

STIG	Date
Cisco IOS XE Router RTR Security Technical Implementation Guide	2019-07-25

Details

Check Text ( C-95875r2_chk )
Verify that the loopback interface is used as the source address for all MSDP packets generated by the router. ip msdp peer x.44.2.34 connect-source Loopback12 remote-as nn If the router does not use its loopback address as the source address when originating MSDP traffic, this is a finding.

Fix Text (F-102719r1_fix)
Configure the router to use its loopback address is used as the source address when sending MSDP packets. R2(config)#ip msdp peer x.44.2.34 connect-source lo12 remote-as nn