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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-216822 | CISC-RT-000940 | SV-216822r531087_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 XR Router RTR Security Technical Implementation Guide | 2020-09-23 |
Details
| Check Text ( C-18054r288840_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. router msdp … … … peer 4.4.4.4 remote-as 33 maximum external-sa 555 ! peer 5.5.5.5 remote-as 44 maximum external-sa 555 ! ! If the router is not configured to limit the source-active messages it accepts, this is a finding. |
| Fix Text (F-18052r288841_fix) |
|---|
| Configure the router to limit the amount of source-active messages it accepts from each peer. RP/0/0/CPU0:R2(config)#router msdp RP/0/0/CPU0:R2(config-msdp)#peer x.14.2.1 RP/0/0/CPU0:R2(config-msdp-peer)#maximum external-sa nnn RP/0/0/CPU0:R2(config-msdp-peer)#exit RP/0/0/CPU0:R2(config-msdp)#peer x.15.3.5 RP/0/0/CPU0:R2(config-msdp-peer)#maximum external-sa nnn RP/0/0/CPU0:R2(config-msdp-peer)#end |