Defining IGMP Snooping

When IGMP Snooping is enabled globally, all IGMP packets are forwarded to the CPU. The CPU analyzes the incoming packets and determines:

Which ports want to join which Multicast groups.

Which ports have Multicast routers generating IGMP queries.

Hosts on ports join a specific Multicast group by sending an IGMP report, learned by the bridge. This results in the creation of the Multicast filtering database.

Note: Ensure that Bridge Multicast filtering is enabled before enabling IGMP Snooping (see Defining Multicast Groups).

To enable IGMP Snooping:

1.Click Layer 2 > Multicast > IGMP Snooping. The IGMP Snooping Page opens:

Figure 58. IGMP Snooping Page

The IGMP Snooping Page contains the following fields:

Enable IGMP Snooping Status — Indicates if IGMP Snooping is enabled on the device. IGMP Snooping can be enabled only if Bridge Multicast Filtering is enabled. The possible field values are:

Checked — Enables IGMP Snooping on the device.

Unchecked — Disables IGMP Snooping on the device.

VLAN ID — Specifies the VLAN ID.

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Intel® Gigabit Ethernet Switch AXXSW1GB User Guide

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Intel AXXSW1GB manual Defining Igmp Snooping