H3C S5500-EI - Enabling Dropping Unknown Multicast Data; Configuring IGMP Report Suppression

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Configuring multicast source port filtering on a port
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or port group
view.
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Use either command.
3. Enable multicast source port
filtering.
igmp-snooping source-deny Disabled by default.
Enabling dropping unknown multicast data
Unknown multicast data refers to multicast data for which no entries exist in the IGMP snooping
forwarding table. When the switch receives such multicast traffic, one of the following occurs:
• When the function of dropping unknown multicast data is disabled, the switch floods unknown
multicast data in the VLAN that the unknown multicast data belongs to, causing network bandwidth
waste and low forwarding efficiency.
• When the function of 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.
Configuration procedure
To enable dropping unknown multicast data in 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.
igmp-snooping drop-unknown Disabled by default
Configuring IGMP report suppression
When a Layer 2 switch receives an IGMP report from a multicast group member, the switch forwards the
message to the Layer 3 device that directly connects to the Layer 2 switch. When multiple members of a
multicast group are attached to the Layer 2 switch, the Layer 3 device might receive duplicate IGMP
reports for the multicast group from these members.