H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 2 IGMP Snooping Configuration
2-22
2.6.7 Configuring Multicast Group Replacement
For some special reasons, the number of multicast groups that can be joined on the
current switch or port may exceed the number configured for the switch or the port. In
addition, in some specific applications, a multicast group newly joined on the switch
needs to replace an existing multicast group automatically. A typical example is
“channel switching”, namely, by joining a new multicast group, a user automatically
switches from the current multicast group to the new one.
To address such situations, you can enable the multicast group replacement function
on the switch or certain ports. When the number of multicast groups joined on the
switch or a port has joined reaches the limit:
z If the multicast group replacement feature is enabled, the newly joined multicast
group automatically replaces an existing multicast group with the lowest address.
z If the multicast group replacement feature is not enabled, new IGMP reports will
be automatically discarded.
I. Configuring multicast group replacement globally
Follow these steps to configure multicast group replacement globally:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter IGMP Snooping
view
igmp-snooping
—
Configure multicast group
replacement
overflow-replace [ vlan
vlan-list ]
Required
Disabled by default
II. Configuring multicast group replacement on a port or a group of ports
Follow these steps to configure multicast group replacement on a port or a group of
ports:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter Ethernet
port view
interface interface-type
interface-number
Enter the
corresponding
view
Enter port
group view
port-group { manual
port-group-name |
aggregation agg-id }
Required
Use either
command.
Configure multicast group
replacement
igmp-snooping
overflow-replace [ vlan
vlan-list ]
Required
Disabled by
default