Enabling Igmp Report Suppression - HP A8800 Configuration Manual

If the function of dropping unknown multicast data is disabled, the router floods unknown multicast
•
data in the VLAN that the unknown multicast data belongs to.
If the function of dropping unknown multicast data is enabled, the router 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 dropping unknown
multicast data.
NOTE:
When enabled to drop unknown multicast data, the router still forwards unknown multicast data to other
router ports in the VLAN.

Enabling IGMP report suppression

When a Layer 2 device receives an IGMP report from a multicast group member, the device forwards the
message to the Layer 3 device directly connected with it. Thus, when multiple members of a multicast
group are attached to the Layer 2 device, the Layer 3 device directly connected with it will receive
duplicate IGMP reports for the multicast group from these members.
With the IGMP report suppression function enabled, within each query cycle, the Layer 2 device
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 to the Layer 3 device. This helps reduce the
number of packets being transmitted over the network.
IMPORTANT:
On an IGMP snooping proxy, IGMP reports for a multicast group from downstream hosts are suppressed
if the forwarding entry for the multicast group exists on the proxy, whether the suppression function is
enabled or not.
To enable IGMP report suppression:
Step
1. Enter system view.
2. Enter IGMP snooping view.
3. Enable IGMP report
suppression.
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.
Command
system-view
vlan vlan-id
igmp-snooping drop-unknown
Command
system-view
igmp-snooping
report-aggregation
30
Remarks
N/A
N/A
Disabled by default.
Remarks
N/A
N/A
Enabled by default.