The multicast Rendezvous Point (RP) Arista router must be configured to filter Protocol Independent Multicast (PIM) Register and Join messages received from the Designated Router (DR) for any undesirable multicast groups and sources.
An XCCDF Rule
Description
<VulnDiscussion>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. Satisfies: SRG-NET-000019-RTR-000013, SRG-NET-000019-RTR-000014</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-256007r882363_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
Configure the RP router to filter PIM register and join messages received from a multicast DR for any undesirable multicast groups or sources.
Step 1: Configure an ACL to filter the multicast groups.
LEAF-1A(config)#ip access-list standard ALLOWED_MULTICAST_GROUP
LEAF-1A(config-std-acl-ALLOWED_MULTICAST_GROUP)#10 permit 224.0.0.0/8