Displaying And Maintaining Igmp Snooping - 3Com Switch 4800G 24-Port Configuration Manual

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp
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Configuring Multicast
Group Replacement
Displaying and
Maintaining IGMP
Snooping
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:
To do...
Enter system view
Enter IGMP Snooping view
Configure multicast group
replacement
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...
Enter system view
Enter the
corresponding view
Configure multicast group
replacement
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.
To do...
View the information of IGMP
Snooping multicast groups

Displaying and Maintaining IGMP Snooping

Use the command...
system-view
igmp-snooping
overflow-replace [ vlan
vlan-list ]
Use the command...
system-view
Enter Ethernet
interface interface-type
port view
interface-number
Enter port group
port-group { manual
view
port-group-name |
aggregation agg-id }
igmp-snooping
overflow-replace [ vlan
vlan-list ]
Use the command...
display igmp-snooping group [ vlan
vlan-id ] [ verbose ]
569
Remarks
-
-
Required
Disabled by default
Remarks
-
Use either command
Required
Disabled by default
Remarks
Available in
any view

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