Suppressing Flooding Of Unknown Multicast Traffic In A Vlan; Configuring Static Member Port For A Multicast Group - 3Com 4200G 12-Port Configuration Manual

Operation
Configure the interval of
sending general queries
Configure the source IP
address of general queries

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
Enter system view
Enable 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
Enter system view
Enter Ethernet port view
Command
igmp-snooping
query-interval seconds
igmp-snooping
general-query source-ip
{ current-interface |
ip-address }
Command
system-view
igmp-snooping
nonflooding-enable
Command
system-view
interface interface-type
interface-number
2-10
Remarks
Optional
By default, the interval of
sending general queries is 60
seconds.
Optional
By default, the source IP
address of general queries is
0.0.0.0.
Remarks
—
Required
By default, unknown multicast
flooding suppression
Remarks
—
—