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45-2

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

OL-8978-04

Chapter 45 Configuring Unicast Flood Blocking

Unicast Flood Blocking Configuration Guidelines

This section describes the guidelines for configuring unicast flood blocking:

• Only the Ethernet ports can block the unicast flood traffic.

• If the Ethernet port is part of an IPX network, you must manually enter a static CAM entry in the

CAM table before you disable unicast flood blocking on the port.

• You cannot configure unicast flood blocking on the SPAN destination ports.

• You cannot configure a SPAN destination on a unicast flood blocking port.

• You cannot configure unicast flood blocking on a trunk port. If you attempt to configure unicast

flood blocking on a trunk port, you will see an error message.

• You cannot configure unicast flood blocking on a port channel.

• You cannot configure a port channel on a unicast flood blocking port.

• Unicast flood blocking and GARP VLAN Registration Protocol (GVRP) are mutually exclusive.

You cannot configure the port to block the unicast flood packets and exchange VLAN configuration

information with the GVRP switches at the same time.

Configuring Unicast Flood Blocking on the Switch

These sections describe how to configure unicast flood blocking:

• Enabling Unicast Flood Blocking, page 45-2

• Disabling Unicast Flood Blocking, page 45-3

• Displaying Unicast Flood Blocking, page 45-3

Note When you are configuring unicast flood blocking, it is important to note that unicast flood blocking is

given priority over other features (such as protocol filtering).

Enabling Unicast Flood Blocking

To configure the switch to drop the unicast flood packets on a port, you must disable unicast flood

blocking.

Note The port disables unicast flooding once the MAC address limit is reached.

To enable unicast flood blocking, perform this task in privileged mode:

Task Command

Enable unicast flood blocking on the desired

Ethernet ports to disable unicast flooding.

set port unicast-flood mod/port disable

Cisco WS-C6506 User Manual

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