H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500 Series Ethernet Switches Chapter 3
IGMP Snooping Configuration
3-10
3.2.5 Configuring to Limit the Number of Multicast Groups on a Port
With limit imposed on the number of multicast groups on a switch port, users can no
longer have as many multicast groups as they want when demanding programs in
multicast groups. Thereby, the bandwidth on the port is controlled.
Follow these steps to configure to limit number of multicast groups on a port:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet port
view
interface interface-type
interface-number
—
Limit the number of
multicast groups on a
port
igmp-snooping group-limit
limit [ vlan vlan-list
[ overflow-replace ] |
overflow-replace]
Optional
The number of multicast
groups on a port is not
limited by default.
3.2.6 Configuring Suppression on IGMP Report Messages
When a Layer 2 switch receives IGMP report messages from a host in a multicast
group, the switch will forward the packets to the port of a Layer 3 switch that is
connected to it. In this way, a Layer 3 switch will receive the same IGMP report
messages from multiple hosts in a multicast group when there are multiple hosts in this
multicast group.
When suppression on IGMP report messages is enabled, in a query interval, the Layer
2 switch will forward only the first IGMP report message from a multicast group to the
Layer 3 switch, and drop the other IGMP report messages from the same multicast
group.
Follow these steps to configure suppression on IGMP report messages:
To do... Use the command... Remarks
Enter system view
system-view
—
Configure
suppression on IGMP
report messages
report-aggregation
Required
By default, suppression on IGMP
report messages is disabled.
3.2.7 Configuring Multicast VLAN
In the current multicast mode, when users in different VLANs order the same stream,
the multicast stream is copied to each of the VLANs. This mode wastes a lot of
bandwidth.