Defining Igmp Snooping - D-Link xStack DES-3228PA Web/Installation Manual

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.
•
Which routing protocols are forwarding packets and Multicast traffic.
Ports requesting to join a specific Multicast group issue an IGMP report, specifying that Multicast group is accept-
ing members. This results in the creation of the Multicast filtering database. To enable IGMP Snooping:
1. Click Advanced Setup > Multicast Support > IGMP. The IGMP Snooping Page opens:
Figure 92: 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.
•
IGMP Snooping Status — Indicates if IGMP snooping is enabled on the VLAN. The possible field values
are:
–
Enable — Enables IGMP Snooping on the VLAN.
–
Disable — Disables IGMP Snooping on the VLAN.
•
Auto Learn — Indicates if Auto Learn is enabled on the device. If Auto Learn is enabled, the devices auto-
matically learns where other Multicast groups are located. Enables or disables Auto Learn on the Ethernet
device.The possible field values are:
–
Enable — Enables auto learn
–
Disable — Disables auto learn.
Configuring Multicast Forwarding
Page 150
Defining IGMP Snooping