Configuring Multicast Group Replacement - HP A5500 SI Switch Series Configuration Manual

To do...
or port group view
Configure the maximum number
of multicast groups that a port can
join
NOTE:
When you configure this maximum number, if the number of multicast groups the port has joined
exceeds the configured maximum value, the system deletes all the forwarding entries for the port from
the IGMP snooping forwarding table, and the hosts on this port join multicast groups again until the
number of multicast groups that the port joins reaches the maximum value. When the port joins a
multicast group, if the port has been configured as a static member port, the system applies the
configurations to the port again. If you have configured simulated joining on the port, the system
establishes corresponding forwarding entry for the port after receiving a report from the simulated
member host.

Configuring multicast group replacement

For various reasons, the number of multicast groups that the switch or a port joins might exceed the
upper limit. In addition, in some specific applications, a multicast group that the switch newly joins must
replace an existing multicast group automatically. A typical example is channel switching: To view a
new channel, a user switches from the current multicast group to the new one.
To address such situations, enable the multicast group replacement function on the switch or on a certain
port. When the number of multicast groups joined on the switch or on a port reaches the limit, one of the
following occurs:
If the multicast group replacement feature is not enabled, new IGMP reports are automatically
•
discarded.
If the multicast group replacement feature is enabled, the multicast group that the switch or a port
•
newly joins automatically replaces an existing multicast group that has the lowest address.
Configuring multicast group replacement globally
Follow these steps to configure multicast group replacement globally:
To do...
Enter system view
Enter IGMP snooping view
Enable multicast group
replacement
Use the command...
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 ]
33
Remarks
Use either approach
Optional
The default depends on the
product model:
• 2000 by default on the
A5500 EI Switch Series
•
1000 by default on the
A5500 SI Switch Series
Remarks
—
—
Required
Disabled by default