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-221146	CISC-RT-000940	SV-221146r622190_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 NX-OS Switch RTR Security Technical Implementation Guide	2021-03-29

Details

Check Text ( C-22861r409927_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 connect-source Ethernet2/1 remote-as nn … … … 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-22850r409928_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 SW1(config)# end