Suppressing Flooding Of Unknown Multicast Traffic In A Vlan - 3Com 5500-EI PWR Install Manual

To do...
Enable IGMP Snooping
querier
Configuring IGMP query interval
Follow these steps to configure IGMP query interval:
To do...
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:
To do...
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.
Follow these steps to suppress flooding of unknown multicast traffic in the VLAN:
To do...
Enter system view
Enable unknown
multicast flooding
suppression
Use the command...
igmp-snooping querier
Use the command...
system-view
vlan vlan-id
igmp-snooping query-interval
seconds
Use the 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 }
Use the command...
system-view
igmp-snooping
nonflooding-enable
11
Remarks
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
—
Required
By default, unknown multicast flooding
suppression