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Step Command Remarks
2. Enter Layer 2 Ethernet
interface view.
interface interface-type
interface-number
N/A
3. Enable multicast source port
filtering.
igmp-snooping source-deny
By default, the multicast source port
filtering is disabled.
Enabling dropping unknown multicast data
Unknown multicast data refers to multicast data for which no forwarding entries exist in the IGMP
snooping forwarding table. When the switch receives such multicast data, one of the following occurs:
• If dropping unknown multicast data is disabled, the switch floods unknown multicast data in the
VLAN to which the data belongs.
• If dropping unknown multicast data is enabled, the switch forwards unknown multicast data to other
router ports instead of flooding it in the VLAN. If no other router ports exist, the switch drops the
unknown multicast data.
To enable dropping unknown multicast data for a VLAN:
Ste
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.
Enabling IGMP report suppression
After receiving an IGMP report from a multicast group member, a Layer 2 switch forwards the IGMP
report to the directly connected Layer 3 device. If multiple members of a multicast group are attached to
the Layer 2 switch, the Layer 3 device will receive multiple membership reports for the same multicast
group.
To reduce the multicast traffic, you can enable the IGMP report suppression function on the Layer 2 switch.
In this way, the Layer 2 switch forwards only the first IGMP report for the multicast group to the upstream
Layer 3 device during one query interval.
To enable IGMP report suppression:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view.
igmp-snooping N/A
3. Enable IGMP report
suppression.
report-aggregation
By default, IGMP report suppression is
enabled.
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