Enabling Igmp Report Suppression; Setting The Maximum Number Of Multicast Groups On A Port - HP MSR2003 Configuration Manual

If the function of dropping unknown multicast data is enabled, the Layer 2 device drops all received
•
unknown multicast data.
To enable dropping unknown multicast data for a VLAN:
Step
1. Enter system view.
2. Enter VLAN view.
3. Enable
multicast data for the VLAN.

Enabling IGMP report suppression

This feature is supported on the following hardware:
MSR routers installed with the Layer 2 switching module HMIM 24GSW, HMIM 24GSW-POE, or HMIM
8GSW.
When a Layer 2 device receives an IGMP report from a multicast group member, the Layer 2 device
forwards the IGMP report to the directly connected Layer 3 device. If multiple members of a multicast
group are attached to the Layer 2 device, the Layer 3 device might receive duplicate reports for the same
multicast group.
When the IGMP report suppression function is enabled, the Layer 2 device in each query interval
forwards only the first IGMP report for the multicast group to the Layer 3 device. It does not forward the
subsequent IGMP reports for the same multicast group, which reduces the number of packets being
transmitted over the network.
To enable IGMP report suppression:
Step
1. Enter system view.
2. Enter IGMP-snooping view.
3. Enable
suppression.

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 on 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 on 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:
Command
system-view
vlan vlan-id
dropping unknown
igmp-snooping drop-unknown
Command
system-view
igmp-snooping
IGMP report
report-aggregation
Remarks
N/A
N/A
By default, IGMP report suppression is
enabled.
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Remarks
N/A
N/A
By default, the dropping unknown
multicast data feature is disabled.
Unknown multicast data is flooded.