The Cisco multicast switch must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.
An XCCDF Rule
Description
<VulnDiscussion>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 switches 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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-221133r622190_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure neighbor prefix lists to only accept PIM control plane traffic from documented PIM neighbors.
Step 1: Configure prefix list for each PIM neighbor.
SW1(config)# ip prefix-list PIM_NEIGHBOR seq 5 permit 10.1.12.2/32
SW1(config)# ip prefix-list PIM_NEIGHBOR deny 0.0.0.0/0 le 32