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The Cisco Multicast Source Discovery Protocol (MSDP) router 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-216732 CISC-RT-000940 SV-216732r531086_rule Low
Description
To reduce any risk of a denial of service (DoS) attack from a rogue or misconfigured MSDP router, the router must be configured to limit the number of source-active messages it accepts from each peer.
STIG Date
Cisco IOS XE Router RTR Security Technical Implementation Guide 2022-11-22

Details

Check Text ( C-17965r288138_chk )
Review the router 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 router is not configured to limit the source-active messages it accepts, this is a finding.
Fix Text (F-17963r288139_fix)
Configure the router to limit the amount of source-active messages it accepts from each peer.

R8(config)#ip msdp sa-limit x.1.28.2 nnn