H3C Technologies H3C S3100V2 Series Switches - Manual (Page 38)

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are attached to the Layer 2 device, the Layer 3 device directly connected with it will receive duplicate
IGMP reports from these members.
With the IGMP report suppression function enabled, within each query cycle, the Layer 2 device
forwards only the first IGMP report per multicast group to the Layer 3 device and will not forward the
subsequent IGMP reports from the same multicast group to the Layer 3 device. This helps reduce the
number of packets being transmitted over the network.
Follow these steps to configure IGMP report suppression:
To do... Use the command... Remarks
Enter system view system-view —
Enter IGMP snooping view igmp-snooping —
Enable IGMP report suppression report-aggregation
Optional
Enabled by default
CAUTION:
On an IGMP snooping proxy, IGMP membership reports are suppressed if the entries for the
corresponding groups exist in the forwarding table, whether the suppression function is enabled or not.
Configuring maximum multicast groups that a port can join
To regulate multicast traffic on a port, configure the maximum number of multicast groups that the port
can join.
Follow these steps to configure the maximum number of multicast groups that a port can join:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type
interface-number
Enter Ethernet interface/Layer 2
aggregate interface view or port
group view
port-group manual
port-group-name
Required
Use either approach
Configure the maximum number of
multicast groups that a port can
join
igmp-snooping group-limit limit
[ vlan vlan-list ] Optional
512 by default
NOTE:
•
When the number of multicast groups that a port has joined reaches the maximum number configured,
the system deletes all the forwarding entries persistent to that port from the IGMP snooping forwarding
table, and the hosts on this port need to join the multicast groups again.
• If you have configured static or simulated joins on a port, however, when the number of multicast groups
on the port exceeds the configured threshold, the system deletes all the forwarding entries persistent to
that port from the IGMP snooping forwarding table and applies the static or simulated joins again, until
the number of multicast groups joined by the port comes back within the configured threshold.