R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

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• When dropping unknown multicast data is disabled, the switch floods unknown multicast data in
the VLAN to which the unknown multicast data belongs, causing network bandwidth waste and low
forwarding efficiency.
• When dropping unknown multicast data is enabled, the switch forwards unknown multicast data to
its router ports instead of flooding it in the VLAN. If no router ports exist, the switch drops the
unknown multicast data.
To enable dropping unknown multicast data for a VLAN:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter VLAN view.
vlan vlan-id N/A
3. Enable dropping unknown
multicast data for the VLAN.
igmp-snooping drop-unknown
By default, this function is disabled.
Unknown multicast data is flooded.
Setting the maximum number of multicast groups on a port
You can set the maximum number of multicast groups on a port to regulate the port traffic.
When you set the maximum number of multicast groups on a port, follow these guidelines:
• This configuration is effective for the multicast groups that a port dynamically joins. If you configure
the port as a static member port for a multicast group, this configuration is not effective for the
multicast group.
• If the number of multicast groups on a port exceeds the limit, the system removes all the forwarding
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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Set the maximum number of
multicast groups on a port.
igmp-snooping group-limit limit
[ vlan vlan-list ]
The default setting is
4294967295.
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 multicast
group with a newly joined multicast group.