Users Guide

Layer 2 Switching Commands 297
mac address-table multicast forbidden address
Use the mac address-table multicast forbidden address command in Global
Configuration mode to forbid adding a specific multicast address to specific
ports. To allow the multicast group, use the no form of this command.
Syntax
mac address-table multicast forbidden address vlan vlan-id {mac-multicast-
address | ip-multicast-address} {add | remove} interface interface-list
no mac address-table multicast forbidden address vlan vlan-id {mac-
multicast-address | ip-multicast-address}
• add — Adds ports to the group.
• remove — Removes ports from the group.
• vlan vlan-id — A valid vlan-id. (Range 1-4093)
• mac-multicast-address —MAC multicast address .
• ip-multicast-address — IP multicast address.
• interface-list — Specify a comma separated list of interface identifiers, a
range of interfaces, or a combination of both. Interface identifiers can be
port channel interface identifiers or Ethernet interface identifiers.
Embedded blanks are not allowed in the list.
Default Configuration
No forbidden addresses are defined.
Command Mode
Global Configuration mode
User Guidelines
Before defining forbidden ports, ensure that the multicast group is registered.
Changing an unregistered multicast address to forbidden on an mrouter port
will effectively forbid the multicast group on all ports on the switch as it
inhibits the source of the multicast group.