← Back to Dell OS10 Switch Layer 2 Switch Security Technical Implementation Guide

V-269963

CAT III (Low)

The Dell OS10 Switch must have IGMP or MLD Snooping configured on all VLANs

Rule ID

SV-269963r1052275_rule

STIG

Dell OS10 Switch Layer 2 Switch Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

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 Dell OS10 Switch configuration to verify that IGMP or MLD snooping has been configured for IPv4 and IPv6 multicast traffic, respectively.

Verify that IGMP and MLD snooping have not been disabled globally by checking that the following have not been configured:

  no ip igmp snooping enable
  no ipv6 mld snooping enable

Verify that IGMP or MLD snooping have not been disabled on any of the individual VLANs:

Interface vlan 100
  no ip igmp snooping
  no ipv6 mld snooping

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.

Enable IGMP or MLD snooping globally:

OS10(config)# ip igmp snooping enable
OS10(config)# ipv6 mld snooping enable

Enable IGMP or MLD snooping on each VLAN:

OS10(config)# interface vlan 100
OS10(conf-if-vl-100)# ip igmp snooping
OS10(conf-if-vl-100)# ipv6 mld snooping