3Com 3CRUS2475 Command Reference Manual page 61

Syntax
bridge multicast forbidden forward-all {add | remove} {ethernet
interface-list | port-channel port-channel-number-list}
no bridge multicast forbidden forward-all
Parameters
add — Forbids forwarding all multicast packets.
■
remove — Does not forbid forwarding all multicast packets.
■
interface-list — Separates nonconsecutive Ethernet ports with a
■
comma and no spaces; a hyphen is used to designate a range of ports.
port-channel-number-list — Separates nonconsecutive port-channels
■
with a comma and no spaces; a hyphen is used to designate a range
of port-channels.
Default Configuration
This setting is disabled.
Command Mode
Interface Configuration (VLAN) mode
User Guidelines
IGMP snooping dynamically discovers multicast device ports. When a
multicast device port is discovered, all the multicast packets are
forwarded to it unconditionally.
This command prevents a port from becoming a multicast device port.
Example
In this example, forwarding all multicast packets to g1 with VLAN 2 is
forbidden.
Console(config)# interface vlan 2
Console(config-if)# bridge multicast forbidden forward-all
add ethernet g1
bridge multicast forbidden forward-all 61