H3C Technologies H3C S12500 Series Switches - Manual (Page 44)

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Configuring a multicast group filter globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IGMP-snooping view. igmp-snooping N/A
3. Configure a multicast group
filter. group-policy acl-number [ vlan
vlan-list ]
By default, no group filter is
globally configured. Hosts in
VLANs can join any valid multicast
group.
Configuring a multicast group filter on a port
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view, or
enter port group view.
• Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface interface-type
interface-number
• Enter port group view:
port-group manual
port-group-name
Use either method.
3. Configure a multicast group
filter. igmp-snooping group-policy
acl-number [ vlan vlan-list ]
By default, no group filter is
configured on the current port.
Hosts on this port can join any
valid multicast group.
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 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 to which the unknown multicast data belongs.
• When the function of dropping unknown multicast data is enabled, the switch drops all received
unknown multicast data.
To enable dropping unknown multicast data in a VLAN:
Step 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.