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The Arista multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join a multicast group only from sources that have been approved by the organization.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-256046ARST-RT-000670SV-256046r882480_ruleCCI-002403medium
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
Arista MLS EOS 4.X Router Security Technical Implementation Guide2025-02-20

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-256046r882480_chk)

Review the configuration of the Arista DR to verify it is filtering IGMP or MLD report messages, allowing hosts to only join multicast groups from sources that have been approved. Note: This requirement is only applicable to Source Specific Multicast (SSM) implementation. Step 1: To verify the ACL filters the unauthorized IGMP joins, execute the command "sh ip access-list". ip access-list standard ALLOWED_SOURCES 10 permit 232.0.0.0/8 20 deny any log Step 2: Verify the ACL is configured on internal host-facing interfaces (pim process) to filter IGMP joins. router pim sparse-mode ipv4 ssm range ALLOWED_SOURCES If the Arista DR is not filtering IGMP or MLD report messages, this is a finding.

Fix Text (F-59665r882479_fix)

Configure the Arista DR to filter the IGMP and MLD report messages to allow hosts to join only multicast groups from sources that have been approved. Step 1: Configure the ACL to filter the unauthorized IGMP groups. LEAF-1A(config-if-Et3)#ip access-list standard ALLOWED_SOURCES LEAF-1A(config-std-acl-ALLOWED_SOURCES)# 10 permit 232.0.0.0/8 LEAF-1A(config-std-acl-ALLOWED_SOURCES)# 20 deny any log Step 2: Configure the IGMP filter in IGMP process. LEAF-1A(config)#router pim sparse-mode LEAF-1A(config-router-pim-sparse)# ipv4 LEAF-1A(config-router-pim-sparse-ipv4)# ssm range ALLOWED_SOURCES