The Juniper PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.

From Juniper Router RTR Security Technical Implementation Guide

Associated with: CCI-002385

JUNI-RT-000690_rule The Juniper PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.

Vulnerability discussion

IGMP snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP membership reports sent by hosts within the bridge domain, the snooping application can set up Layer 2 multicast forwarding tables to deliver traffic only to ports with at least one interested member within the VPLS bridge, thereby significantly reducing the volume of multicast traffic that would otherwise flood an entire VPLS bridge domain. The IGMP snooping operation applies to both access circuits and pseudowires within a VPLS bridge domain.

Check content

Review the router configuration to verify that PIM snooping has been configured under the routing instance protocols hierarchy for each VPLS bridge domain as shown in the example. routing-instances { VPLS_CUST2 { instance-type vpls; interface ge-0/1/0.0; route-distinguisher 22:22; vrf-target target:22:22; } protocols { vpls { site-range 9; no-tunnel-services; site R8 { site-identifier 8; interface ge-0/1/0.0; } vpls-id 102; neighbor 8.8.8.8; } pim-snooping; } } } } If the router is not configured to implement PIM snooping for each VPLS bridge domain, this is a finding.

Fix text

Configure PIM snooping for each VPLS bridge domain as shown in the example below. [edit routing-instances VPLS_CUST2] set routing-instances VPLS_CUST2 protocols pim-snooping

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