Configuring Maximum Multicast Groups That Can Be Joined On A Port; Configuring Multicast Group Replacement - HP A6600 Configuration Manual

Configuring maximum multicast groups that can be joined on a
port
By configuring the maximum number of multicast groups that a port can join, you can limit the number of
multicast programs on-demand available to users, thus to regulate traffic on the port.
To do...
1. Enter system view.
2. Enter Ethernet interface/Layer
2 aggregate interface view or
port group view.
3. Set the maximum number of
multicast groups that a port
can join.
When you set or change the maximum number of multicast groups that a port can join, if the port is
currently in more multicast groups, the system deletes all the forwarding entries for the port from the IGMP
snooping forwarding table to expel the port from all groups. Then, if the port is a static member port of
some multicast groups, the system applies the static member port configuration again to re-join the port to
the groups. If simulated joining is enabled on the port, the port sends IGMP responses in response to
IGMP queries to trigger the establishment of the corresponding forwarding entries.

Configuring multicast group replacement

The number of multicast groups that can be joined on the current router or port might exceed the number
configured for the router or the port. In addition, in some specific applications, a multicast group newly
joined on the router needs to replace an existing multicast group automatically. A typical example is
"channel switching". 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 router or
certain ports. When the number of multicast groups joined on the router 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
To do...
1. Enter system view.
2. Enter IGMP-snooping view.
3. Enable multicast group
replacement.
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
igmp-snooping group-limit limit
[ vlan vlan-list ]
Use the command...
system-view
igmp-snooping
overflow-replace [ vlan vlan-list ]
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Remarks
—
Required.
Use either approach.
Optional.
1000 by default.
Remarks
—
—
Required.
Disabled by default.