Suppressing Flooding Of Unknown Multicast Traffic In A Vlan - 3Com 4210 9-Port Configuration Manual

Operation
Enable IGMP Snooping
Enable IGMP Snooping querier
Configuring IGMP query interval
Follow these steps to configure IGMP query interval:
Operation
Enter system view
Enter VLAN view
Configure the IGMP query
interval
Configuring the source address to be carried in IGMP queries
Follow these steps to configure the source address to be carried in IGMP queries:
Operation
Enter system view
Enter VLAN view
Configure the source IP
address of IGMP general
queries
Configure the source IP
address of IGMP group-specific
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 2-11 Suppress flooding of unknown multicast traffic in the VLAN
Operation
Enter system view
Command
igmp-snooping enable
igmp-snooping querier
Command
system-view
vlan vlan-id
igmp-snooping
query-interval seconds
Command
system-view
vlan vlan-id
igmp-snooping
general-query source-ip
{ current-interface |
ip-address }
igmp-snooping
special-query source-ip
{ current-interface |
ip-address }
Command
system-view
2-10
Remarks
Required
By default, IGMP Snooping is
disabled.
Required
By default, IGMP Snooping
querier is disabled.
Remarks
—
—
Optional
60 seconds by default.
Remarks
—
—
Optional
0.0.0.0 by default
0.0.0.0 by default
Remarks
—