The Dell OS10 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.

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.

Verify the RP router is configured to filter PIM register messages.

! ip access-list PIM_REGFILTER seq 10 permit ip 10.10.10.2/32 any !

! ip pim register-filter PIM_REGFILTER !

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.

Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.

OS10# configure terminal OS10(config)# OS10(config)# OS10(config)# ip access-list PIM_REGFILTER OS10(config-ipv4-acl)# permit ip 10.10.10.2/32 any OS10(config-ipv4-acl)# exit OS10(config)# OS10(config)# ip pim register-filter PIM_REGFILTER