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78 Intel® Gigabit Ethernet Switch AXXSW1GB User Guide
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.