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CISC-RT-000800 - The Cisco multicast router must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.

Information

PIM is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infrastructure. PIM traffic must be limited to only known PIM neighbors by configuring and binding a PIM neighbor filter to those interfaces that have PIM enabled. If a PIM neighbor filter is not applied to those interfaces that have PIM enabled, unauthorized routers can join the PIM domain, discover and use the rendezvous points, and also advertise their rendezvous points into the domain. This can result in a denial of service by traffic flooding or result in the unauthorized transfer of data.

Solution

This requirement is not applicable for the DODIN Backbone.

Configure neighbor ACLs to only accept PIM control plane traffic from documented PIM neighbors. Bind neighbor ACLs to all PIM enabled interfaces.

Step 1: Configure ACL for PIM neighbors.

R2(config)#ip access-list standard PIM_NEIGHBORS
R2(config-std-nacl)#permit 10.1.2.6
R2(config-std-nacl)#exit

Step 2: Apply the ACL to all interfaces enabled for PIM.

R2(config)#int g1/1
R2(config-if)#ip pim neighbor-filter PIM_NEIGHBORS

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_IOS-XE_Router_Y26M01_STIG.zip

Item Details

Category: ACCESS CONTROL

References: 800-53|AC-4, CAT|II, CCI|CCI-001414, Rule-ID|SV-216718r1117237_rule, STIG-ID|CISC-RT-000800, STIG-Legacy|SV-106147, STIG-Legacy|V-97009, Vuln-ID|V-216718

Plugin: Cisco

Control ID: 2879201e98a2206de4384506dc9ae101cc17842b4df84fc75c39938723a24c57