H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 440)

44-10
Suppressing Flooding of Unknown Multicast Traffic in a VLAN
With IGMP Snooping enabled in a VLAN, multicast traffic for unknown multicast groups is flooded within
the VLAN by default. This wastes network bandwidth and affects multicast forwarding efficiency.
With the unknown multicast flooding suppression function enabled, when receiving a multicast packet
for an unknown multicast group, an IGMP Snooping device creates a nonflooding entry and relays the
packet to router ports only, instead of flooding the packet within the VLAN. If the device has no router
ports, it drops the multicast packet.
Follow these steps to suppress flooding of unknown multicast traffic in the VLAN:
To do… Use the command… Remarks
Enter system view system-view —
Enable unknown multicast flooding
suppression igmp-snooping
nonflooding-enable
Required
By default, unknown multicast
flooding suppression
If the function of dropping unknown multicast packets is enabled, you cannot enable unknown multicast
flooding suppression.
Configuring Static Member Port for a Multicast Group
If the host connected to a port is interested in the multicast data for a specific group, you can configure
that port as a static member port for that multicast group.
In Ethernet port view
Follow these steps to configure a static multicast group member port in Ethernet port view:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the current port as a
static member port for a multicast
group in a VLAN
multicast static-group
group-address vlan vlan-id
Required
By default, no port is configured as
a static multicast group member
port.
In VLAN interface view
Follow these steps to configure a static multicast group member port in VLAN interface view: