Enabling The Multicast Group Replacement Function - HP 5920 series Configuration Manual

If the number of multicast groups on a port exceeds the limit, the system removes all the forwarding
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entries related to that port from the IGMP snooping forwarding table. The receiver hosts attached to
that port can join multicast groups again before the number of multicast groups on the port reaches
the limit.
To set the maximum number of multicast groups on a port:
Step
1. Enter system view.
2. Enter Ethernet interface view
or aggregate interface view.
3. Set the maximum number of
multicast groups on a port.

Enabling the multicast group replacement function

When the number of multicast groups on a switch or a port exceeds the limit:
If the multicast group replacement is enabled, the switch or the port replaces an existing IPv6
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multicast group with a newly joined IPv6 multicast group.
If the IPv6 multicast group replacement is disabled, the switch or the port discards IGMP reports that
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are used for joining a new IPv6 multicast group.
In some specific applications, such as channel switching, a newly joined multicast group must
automatically replace an existing multicast group. In this case, the function of IPv6 multicast group
replacement must also be enabled so a user can switch from the current multicast group to a new group.
When you enable the multicast group replacement function, follow these guidelines
This configuration is effective for the multicast groups that a port dynamically joins. If you configure
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the port as a static member port for a multicast group, this configuration is not effective for the
multicast group.
You can enable the multicast group replacement function either for the current port in proper
•
interface view or globally for all ports in IGMP-snooping view. If the configurations are made in
both interface view and IGMP-snooping view, the configuration made in interface view takes
priority.
To enable the multicast group replacement function globally:
Step
1. Enter system view.
2. Enter IGMP-snooping view.
Enable the multicast group
3.
replacement function globally.
To enable the multicast group replacement function on a port:
Step
1. Enter system view.
Command
system-view
interface interface-type
interface-number
igmp-snooping group-limit limit
[ vlan vlan-list ]
Command
system-view
igmp-snooping
overflow-replace [ vlan vlan-list ]
Command
system-view
24
Remarks
N/A
N/A
The default setting is
4294967295.
Remarks
N/A
N/A
By default, the multicast group
replacement function is disabled.
Remarks
N/A