H3C Technologies H3C S10500 Series Switches - Manual (Page 49)

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To do... Use the command... Remarks
Enter IGMP-snooping view igmp-snooping —
Enable IGMP report suppression report-aggregation
Required
Enabled by default.
CAUTION:
On an IGMP snooping proxy, IGMP membership reports are suppressed if the entries for the
corresponding groups exist in the forwarding table, no matter the suppression function is enabled or not.
Setting the maximum number of multicast groups that a port can
join
To regulate multicast traffic on a port, configure the maximum number of multicast groups that the port
can join.
Follow these steps to set the maximum number of multicast groups that a port can join:
To do... Use the command... Remarks
Enter system view system-view —
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface interface-type
interface-number
Enter Layer 2 Ethernet interface
view, Layer 2 aggregate interface
view, or port group view
Enter port group view:
port-group manual
port-group-name
Required
Use either command
Set the maximum number of
multicast groups that a port can
join
igmp-snooping group-limit limit
[ vlan vlan-list ]
Required
2000 by default.
NOTE:
When you configure this maximum number, if the number of multicast groups the port has joined exceeds
the configured maximum value, the system deletes all the forwarding entries for the port from the IGMP
snooping forwarding table, and the hosts on this port join multicast groups again until the number of
multicast groups that the port joins reaches the maximum value. When the port joins a multicast group, if
the port has been configured as a static member port, the system applies the configurations to the port
again. If you have configured simulated joining on the port, the system establishes corresponding
forwarding entry for the port after receiving a report from the simulated member host.
Configuring multicast group replacement
For various reasons, the number of multicast groups that the switch or a port joins might exceed the upper
limit. In addition, in some specific applications, a multicast group that the switch newly joins must replace
an existing multicast group automatically. A typical example is channel switching: To view a new channel,
a user switches from the current multicast group to the new one.