Suppressing Flooding Of Unknown Multicast Traffic In A Vlan; Configuring Static Member Port For A Multicast Group - 3Com 4500 PWR 26-Port Configuration Manual

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
If the function of dropping unknown multicast packets or the XRN fabric function is enabled, you
cannot enable unknown multicast flooding suppression.
Unknown multicast flooding suppression and multicast source port suppression cannot take effect
at the same time. If both are enabled, only multicast source port suppression takes effect. In this
case, multicast data received on the blocked port will be dropped.

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
Follow these steps to configure a static multicast group member port in Ethernet port view:
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
27-11
Remarks
—
—
Optional
0.0.0.0 by default
0.0.0.0 by default
Remarks
—
Required
By default, unknown multicast flooding
suppression