Detections
Analytics
ARST-L2-000130 - The Arista MLS layer 2 switch must have IGMP or MLD Snooping configured on all VLANs.
Information
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.Solution
Configure the Arista MLS switch for IGMP snooping for IPv4 and IPv6 multicast traffic for each VLAN.Configure the Arista MLS switch for IP PIM, which also enables IGMP on an Arista MLS switch VLAN or interface, by using the following command:
switch(config)#int vlan8
ip igmp
pim ipv4 sparse-mode
pim ipv6 sparse-mode
switch(config)#exit
!
Arista MLS switch alternative configuration for MLD snooping on an interface for version 1 and 2. Version 2 is the default MLD version.
switch(config)# mld snooping
switch(config-mld-snooping)# vlan 200
!
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_EOS_4-X_Y25M07_STIG.zip
Item Details
Audit Name: DISA Arista MLS EOS 4.X L2S STIG v2r3
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|III, CCI|CCI-000366, Rule-ID|SV-255976r882270_rule, STIG-ID|ARST-L2-000130, Vuln-ID|V-255976
Plugin: Arista
Control ID: e3b0c13a048b51b9f271a8b5b402386cd00d3d28961267c6e15919873f0b8a44