H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 203)

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Table 69 Configuration items
Item Description
Port
Select the port on which advanced IGMP snooping features are to be configured.
After a port is selected, advanced features configured on this port are displayed at
the lower part of the page.
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.
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 the port must 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 device, when receiving an IGMP
leave message on the port, immediately deletes that port from the outgoing port list
of the corresponding forwarding entry. Then, when receiving IGMP group-specific
queries for that multicast group, the device will not forward them to that port.
You can enable IGMP snooping fast-leave processing on a port that has only one
receiver host attached to save bandwidth and resources. If a port has multiple hosts
attached and the function of dropping unknown multicast packets has been enabled
on the switch or in the VLAN where the port resides, you should not enable IGMP
snooping fast-leave processing on this port. Otherwise, other hosts attached to this
port in the same multicast group cannot receive the multicast data for the group.
Displaying IGMP snooping multicast entry
information
1. From the navigation tree, select Network > IGMP snooping.
The basic configuration page appears, as shown in
Figure 146 .
2. Click the plus sign (+) in front of Show Entries to display IGMP snooping multicast entries, as shown
in
Figure 149 .
Figure 149 Displaying entry information
3. Click the icon corresponding to an entry to display the detailed information of the entry, as
shown in Figure 150 .