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The Cisco ACI multicast must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272095CACI-RT-000035SV-272095r1115727_ruleCCI-002403low
Description
Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download here or there), whereas multicast can have broader impact on bandwidth consumption, resulting in extreme network congestion. Hence, it is imperative that there is multicast admission control to restrict which multicast groups hosts are allowed to join via IGMP or MLD.
STIGDate
Cisco ACI Router Security Technical Implementation Guide2025-06-18

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-03Boundary Protection
0.50
NET-04.1Deny Traffic by Default & Allow Traffic by Exception
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CM-6Configuration Settings
1.00
SC-24Fail in Known State
1.00
SC-47Alternate Communications Paths
1.00
SC-5Denial-of-service Protection
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-7(5)Deny by Default — Allow by Exception
1.00
CCI1 mapping
CCI-002403
1.00

Details

Check Text (C-272095r1115727_chk)

This requirement is only applicable to Source Specific Multicast (SSM) implementation. This requirement is not applicable to Any Source Multicast (ASM) since the filtering is being performed by the rendezvous point switch. Review the configuration of the designated router (DR) to verify that it is filtering IGMP or MLD Membership Report messages, allowing hosts to join only those groups that have been approved. If the Cisco ACI is not filtering IGMP or MLD Membership Report messages, this is a finding.

Fix Text (F-76052r1115726_fix)

Configure "IGMP Snooping" and create access groups that define which multicast groups are permitted on specific ports. For filtering IPv6 multicast traffic (MLD), use similar commands with the "mld" keyword instead of "igmp". 1. Navigate to the relevant bridge domain, interface or VLAN and enable IGMP snooping using the command. apic(config)# interface <interface_name> apic (config-if)# ip igmp snooping or apic(config)# bd BD-1 apic(config-bd-1)# ip igmp snooping 2. Define a new access group with a name and specify the permitted multicast groups. apic(config)# ip igmp snooping vlan <vlan_id> access-group <access_group_name> apic(config)# access-group <access_group_name> apic(config)# permit ip multicast <multicast_group_address> 3. Navigate to the specific port configuration where the filter is to be applied. apic(config)# ip igmp snooping access-group <group-name> to associate the created access group with the port. apic(config)# interface Ethernet1/1 apic(config-if)# ip igmp snooping access-group allowed-groups