MLD snooping support for EVPN-MPLS

Multicast Listener Discovery (MLD) protocol snooping is supported in an EVPN over an MPLS network. Enabling MLD snooping helps to constrain IPv6 multicast traffic to interested receivers in a broadcast domain. Multicast sources and receivers in the EVPN instance (EVI) can each be single-homed to one provider edge (PE) device or multihomed in active/active mode to multiple PE devices.

MLD snooping support in this environment includes:

• Either MLDv1 and MLDv2 with any-source multicast (*,G) or MLDv2 with source-specific multicast (S,G) (configurable)
• MLD state synchronization among multihoming PE devices using BGP EVPN Type 7 (Join Sync Route) and Type 8 (Leave Sync Route) network layer reachability information (NLRI)
• Inclusive multicast forwarding from the ingress PE device into the EVPN core to reach all other PE devices
• Forwarding across bridge domains (VLANs) using IRB interfaces and PIM operating in passive and distributed designated router (PIM-DDR) modes