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The Juniper EX switch must be configured to enable IGMP or MLD Snooping on all VLANs.


Overview

Finding ID Version Rule ID IA Controls Severity
V-253963 JUEX-L2-000160 SV-253963r843922_rule Low
Description
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.
STIG Date
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide 2022-08-31

Details

Check Text ( C-57415r843920_chk )
Review the switch configuration to verify that IGMP or MLD snooping has been configured for IPv4 and IPv6 multicast traffic respectively.

Verify IGMP and MLD is globally configured for all VLANs:
[edit protocols]
igmp-snooping {
vlan all {
immediate-leave;
interface . {
multicast-router-interface;
}
}
}
mld-snooping {
vlan all {
immediate-leave;
interface . {
multicast-router-interface;
}
}
}

For VLAN-specific values, verify IGMP and MLD snooping is configured for each VLAN:
[edit protocols]
igmp-snooping {
vlan vlan-name {
immediate-leave;
interface . {
multicast-router-interface;
}
interface . {
host-only-interface;
}
}
}
mld-snooping {
vlan vlan-name {
immediate-leave;
interface . {
multicast-router-interface;
}
interface . {
host-only-interface;
}
}
}

If the switch is not configured to implement IGMP or MLD snooping for each VLAN, this is a finding.
Fix Text (F-57366r843921_fix)
Configure IGMP or MLD snooping for IPv4 and IPv6 multicast traffic respectively for each VLAN.

Global:
set protocols igmp-snooping vlan all immediate-leave
set protocols igmp-snooping vlan all interface . multicast-router-interface
set protocols mld-snooping vlan all immediate-leave
set protocols mld-snooping vlan all interface . multicast-router-interface

Per VLAN:
set protocols igmp-snooping vlan vlan-name immediate-leave
set protocols igmp-snooping vlan vlan-name interface . multicast-router-interface
set protocols igmp-snooping vlan vlan-name interface . host-only-interface
set protocols mld-snooping vlan vlan-name immediate-leave
set protocols mld-snooping vlan vlan-name interface . multicast-router-interface
set protocols mld-snooping vlan vlan-name interface . host-only-interface