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Section 10. Conguring Multicast Forwarding
Multicast forwarding enables transmitting packets from either a specic multicast group to a source, or from a nonspecic
source to a multicast group.
This section contains the following topics:
Enabling IGMP Snooping
Dening Multicast Bridging Groups
Dening Multicast Forward All Parameters
10.1 Conguring Multicast Forwarding
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 trafc.
Ports requesting to join a specific Multicast group issue an IGMP report, specifying that Multicast group is accepting
members. This results in the creation of the Multicast ltering database.
To enable IGMP Snooping:
1. Click System > Bridging Cong > Multicast Support > IGMP Snooping. The IGMP Snooping Page opens:
Figure 94: IGMP Snooping Page
The IGMP Snooping Page contains the following elds:
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 eld values are:
– Checked — Enables IGMP Snooping on the device.
– Unchecked — Disables IGMP Snooping on the
device.
VLAN ID — Species the VLAN ID.
IGMP Snooping Status — Indicates if IGMP Snooping is enabled on the VLAN.
The possible eld 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 automatically 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
Host Timeout — Indicates the amount of time host waits to receive a message before timing out. The default time is 260
seconds.
MRouter Timeout — Indicates the amount of the time the Multicast router waits to receive a message before it times out.