![]() How IGMP Snooping Works with Routed VLAN Interfaces OnĪll other devices, you must explicitly configure IGMP snooping on a VLAN or in a bridge domain (ELS) configuration style, IGMP snooping is enabled by default on all VLANs (or only on theĭefault VLAN on some devices) and you can disable it selectively on one or more VLANs. On EX Series and QFX Series switches that do not support the Enhanced Layer 2 Software That are connected to members of the appropriate multicast groups. Uses the multicast forwarding table to selectively forward the traffic to only the interfaces When the device receives multicast packets, it That are connected to members of the groups. IGMP packets between receivers and multicast routers and uses the content of the packets toīuild a multicast forwarding table-a database of multicast groups and the interfaces ![]() When you enable IGMP snooping, the device monitors Might not necessarily be interested receivers. The traffic on the relevant VLAN, sending a significant amount of traffic for which there However, a multicast MAC address can never be the source address for a packet.Īs a result, when a device receives traffic for a multicast destination address, it floods The frames they receive and then send any traffic for that unicast address only to the appropriate Devices usually learn unicast MAC addresses by checking the source address field of
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