R3102-R3103-HP 6600/HSR6600 Routers IP Multicast Configuration Guide

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Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view. igmp-snooping N/A
3. Enable IGMP report
suppression.
report-aggregation Enabled by default.
Setting the maximum number of multicast groups that a port can
join
You can set the maximum number of multicast groups that a port can join to regulate traffic on the port.
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.
To set the maximum number of multicast groups that a port can join:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view, or
enter port group view.
• Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Use either command.
3. Set the maximum number of
multicast groups that the port
can join.
igmp-snooping group-limit limit
[ vlan vlan-list ]
The default value is 1000.
Enabling multicast group replacement
For various reasons, the number of multicast groups that the router or a port joins might exceed the upper
limit. In addition, in some specific applications, a multicast group that the router 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 realize such requirements, you can enable the multicast group replacement function on the router or
on a certain port. When the number of multicast groups that the router or on the port has joined reaches
the limit, one of the following occurs:
• If the multicast group replacement feature is disabled, new IGMP reports are automatically
discarded.