3Com 4200G 12-Port - Configuring Static Member Port for a Multicast Group; Suppressing Flooding of Unknown Multicast Traffic in a VLAN

2-10
Operation Command Remarks
Configure the interval of
sending general queries
igmp-snooping
query-interval seconds
Optional
By default, the interval of
sending general queries is 60
seconds.
Configure the source IP
address of general queries
igmp-snooping
general-query source-ip
{ current-interface |
ip-address }
Optional
By default, the source IP
address of general queries is
0.0.0.0.
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
—