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.
78 | Intel® Gigabit Ethernet Switch AXXSW1GB User Guide |
