The multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207118	SRG-NET-000019-RTR-000013	SV-207118r604135_rule		Low

Description
Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast packets, over-using the available bandwidth and thereby creating a denial-of-service (DoS) condition. Hence, it is imperative that register messages are accepted only for authorized multicast groups and sources.

STIG	Date
Router Security Requirements Guide	2021-03-16

Details

Check Text ( C-7379r382247_chk )
Verify that the RP router is configured to filter PIM register messages. If the RP router peering with PIM-SM routers is not configured with a PIM import policy to block registration messages for any undesirable multicast groups and sources, this is a finding.

Fix Text (F-7379r382248_fix)
Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.