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Catalyst 6500 Series Switch Command Reference—Release 8.4
OL-6244-01
Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands
set port unicast-flood
set port unicast-flood
To configure the switch to drop Unicast Flood traffic on an Ethernet port, use the set port unicast-flood
command.
set port unicast-flood mod/port {enable | disable}
Syntax Description
Defaults Unicast flood blocking is disabled on all ports.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines Only Ethernet ports can block unicast flood traffic.
You must have a static CAM entry associated with the Ethernet port before you disable unicast flood on
the port, or you will lose network connectivity when you disable unicast flood. You can verify a static
CAM entry exists by entering the show cam static command.
You cannot configure a port channel on a unicast flood disabled port, and you cannot disable unicast
flood on a port channel.
You cannot disable unicast flood on a SPAN destination port, and you cannot configure a SPAN
destination on a unicast flood disabled port.
You cannot disable unicast flood on a trunk port. If you do, an error message will be displayed.
If you disable unicast flood on an Ethernet port that has port security enabled on it, the switch stops
sending Unicast Flood packets to the port once the switch has learned the allowed maximum number of
MAC addresses. When the learned MAC address count drops below the maximum number allowed,
unicast flooding is automatically reenabled.
Unicast flood blocking and GARP VLAN Registration Protocol (GVRP) are mutually exclusive. You
cannot disable unicast flood and exchange VLAN configuration information with GVRP switches at the
same time.
Examples This example shows how to enable unicast flood traffic on module 4, port 1 of a switch:
Console> (enable) set port unicast-flood 4/1 disable
WARNING: Trunking & Channelling will be disabled on the port.
Unicast Flooding is successfully disabled on the port 4/1.
Console> (enable)
mod/port Number of the module and the port on the module.
enable Enables unicast flood and disables unicast flood blocking.
disable Disables unicast flood and enables unicast flood blocking.