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 | CCI-001368 | 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 | 2025-05-20 | |||
Details
Check Text (C-221068r622190_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