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2. Configuration items for advanced IGMP snooping features
Item Descri
tion
Port
Select the port on which advanced IGMP snooping features are to be configured. The port
can be an Ethernet port or Layer-2 aggregate port.
After a port is selected, advanced features configured on this port are displayed at the
lower part of this page.
IMPORTANT:
Advanced IGMP snooping features configured on a Layer 2 aggregate port do not interfere
with features configured on its member ports, nor do they take part in aggregation
calculations; features configured on a member port of the aggregate group will not take
effect until it leaves the aggregate group
VLAN ID
Specify a VLAN in which you can configure the fast leave function for the port or the
maximum number of multicast groups allowed on the port.
Configurations made in a VLAN take effect for the ports in this VLAN only.
Group Limit
Configure the maximum number of multicast groups that the port can join.
With this feature, you can regulate multicast traffic on the port.
IMPORTANT:
When the number of multicast groups a port has joined reaches the configured threshold, the
system deletes all the forwarding entries persistent on that port from the IGMP snooping
forwarding table, and the hosts on this port need to join the multicast groups again.
Fast Leave
Enable or disable the fast leave function for the port.
With the fast leave function enabled on a port, the switch, when receiving an IGMP leave
message on the port, immediately deletes that port from the outgoing port list of the
corresponding forwarding table entry. Then, when receiving IGMP group-specific queries
for that multicast group, the switch does not forward them to that port. In VLANs where
only one host is attached to each port, the fast leave function helps improve bandwidth
and resource usage.
IMPORTANT:
If fast leave is enabled for a port to which more than one host is attached, when one host
leaves a multicast group, the other hosts listening to the same multicast group fails to receive
multicast data.
Return to Configuration task list.
Display IGMP snooping multicast entry information
Select Network IGMP Snooping in the navigation tree to enter the basic configuration page shown in a.
Click the plus sign (+) in front of Show Entries to display information about IGMP snooping multicast entries,
as shown in a. You can view the detailed information of an entry by clicking the
icon corresponding to
the entry.
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