The Cisco Multicast Source Discovery Protocol (MSDP) switch must be configured to limit the amount of source-active messages it accepts on a per-peer basis.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221068	CISC-RT-000940	SV-221068r622190_rule		Low

Description
To reduce any risk of a denial-of-service (DoS) attack from a rogue or misconfigured MSDP switch, the switch must be configured to limit the number of source-active messages it accepts from each peer.

STIG	Date
Cisco IOS-XE Switch RTR Security Technical Implementation Guide	2022-09-13

Details

Check Text ( C-22783r408998_chk )
Review the switch configuration to determine if it is configured to limit the amount of source-active messages it accepts on a per-peer basis. ip msdp peer x.1.28.2 remote-as nn ip msdp sa-filter in 10.1.28.2 list MSDP_SA_FILTER ip msdp sa-limit X.1.28.2 nnn If the switch is not configured to limit the source-active messages it accepts, this is a finding.

Fix Text (F-22772r408999_fix)
Configure the switch to limit the amount of source-active messages it accepts from each peer. SW1(config)#ip msdp sa-limit x.1.28.2 nnn