Question

A service provider deploys a Carrier Ethernet EVPN bridge domain that carries IPTV multicast traffic between subscriber-facing switches. The Layer 2 segment has no multicast router (no PIM-enabled interface) attached, so there is no periodic IGMP General Query on the segment. Operators report that after the IGMP membership report timers expire, multicast streams are flooded to all ports in the bridge domain instead of being constrained to interested receivers. IGMP snooping is enabled on the switches. Which action resolves the flooding while keeping the design Layer 2 only?

Accepted Answer

Configure an IGMP snooping querier on one of the switches in the bridge domain to source periodic General Queries

Answer

Enable PIM sparse mode on a subscriber-facing SVI to elect a designated router for the segment

Answer

Disable IGMP snooping so the switch learns groups through MAC address flooding suppression

Answer

Increase the IGMP snooping robustness variable to prevent report timers from expiring