H3C S5100-SI

2-10
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 switch creates a nonflooding entry and relays the
packet to router ports only, instead of flooding the packet within the VLAN. If the switch has no router
ports, it drops the multicast packet.
Table 2-12 Suppress flooding of unknown multicast traffic in the VLAN
Operation 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
Table 2-13 Configure a static multicast group member port in Ethernet port view
Operation 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
Table 2-14 Configure a static multicast group member port in VLAN interface view
Operation Command Remarks
Enter system view
system-view
—