Displaying and Maintaining IGMP Snooping 569
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:
■ If the multicast group replacement feature is enabled, the newly joined
multicast group automatically replaces an existing multicast group with the
lowest address.
■ If the multicast group replacement feature is not enabled, new IGMP reports
will be automatically discarded.
Configuring multicast group replacement globally
Follow these steps to configure multicast group replacement globally:
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:
c
CAUTION: Be sure to configure the maximum number of multicast groups
allowed on a port (refer to “Configuring Maximum Multicast Groups that Can Be
Joined on a Port” on page 568) before configuring multicast group replacement.
Otherwise, the multicast group replacement functionality will not take effect.
Displaying and
Maintaining IGMP
Snooping
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
To do… Use the command… Remarks
Enter system view system-view -
Enter the
corresponding view
Enter Ethernet
port view
interface interface-type
interface-number
Use either command
Enter port group
view
port-group { manual
port-group-name |
aggregation agg-id }
Configure multicast group
replacement
igmp-snooping
overflow-replace [ vlan
vlan-list ]
Required
Disabled by default
To do… Use the command… Remarks
View the information of IGMP
Snooping multicast groups
display igmp-snooping group [ vlan
vlan-id ] [ verbose ]
Available in
any view
To Next Page
Loading...
