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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-90977	JUNI-RT-000930	SV-101187r1_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
Juniper Router RTR Security Technical Implementation Guide	2018-11-15

Details

Check Text ( C-90241r2_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. protocols { … … … } msdp { export SA_EXPORT; import SA_IMPORT; group AS25 { peer x.x.x.x { active-source-limit { maximum nnn; } If the router is not configured to limit the source-active messages it accepts, this is a finding.

Fix Text (F-97285r2_fix)
Configure the router to limit the amount of source-active messages it accepts from each peer. [edit protocols msdp group AS25 peer x.x.x.x] set active-source-limit maximum nnn