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Check: SRG-NET-000512-L2S-000002

Layer 2 Switch SRG: SRG-NET-000512-L2S-000002 (in versions v2 r1 through v1 r4)

Title

The layer 2 switch must have IGMP or MLD Snooping configured on all VLANs (Cat III impact)

Discussion

IGMP and MLD snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership reports sent by hosts within a VLAN, the snooping application can set up Layer 2 multicast forwarding tables to deliver specific multicast traffic only to interfaces connected to hosts interested in receiving the traffic, thereby significantly reducing the volume of multicast traffic that would otherwise flood the VLAN.

Check Content

Review the switch configuration to verify that IGMP or MLD snooping has been configured for IPv4 and IPv6 multicast traffic respectively. If the switch is not configured to implement IGMP or MLD snooping for each VLAN, this is a finding.

Fix Text

Configure IGMP or MLD snooping for IPv4 and IPv6 multicast traffic respectively for each VLAN.

Additional Identifiers

Rule ID: SV-206662r385561_rule

Vulnerability ID: V-206662

Group Title: SRG-NET-000512

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CCIs

CCIs tied to check.

Number	Definition
CCI-000366	The organization implements the security configuration settings.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-6	Configuration Settings