Configuration Guidelines For Unicast Flood Blocking; Configuring Unicast Flood Blocking On The Switch; Enabling Unicast Flood Blocking - Cisco WS-C2948G-GE-TX Configuration Manual

Configuration Guidelines for Unicast Flood Blocking

Configuration Guidelines for Unicast Flood Blocking
This section lists the guidelines for configuring unicast flood blocking:
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Configuring Unicast Flood Blocking on the Switch

These sections describe how to configure unicast flood blocking:
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Note It is important to remember that the unicast flood blocking feature is given priority over other features,
such as protocol filtering.

Enabling Unicast Flood Blocking

To configure the switch to drop unicast flood packets on a port, you must disable unicast flood blocking.
The port disables unicast flooding once the MAC address limit is reached.
Note
To configure unicast flood blocking, perform this task in privileged mode:
Task
Enable unicast flood blocking on the desired
Ethernet ports to disable unicast flooding.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
17-2
Only Ethernet ports can block 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 on the port.
You cannot configure unicast flood blocking on 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 unicast flood packets and exchange VLAN configuration
information with GVRP switches at the same time.
Enabling Unicast Flood Blocking, page 17-2
Disabling Unicast Flood Blocking, page 17-3
Displaying Unicast Flood Blocking, page 17-3
Chapter 17 Configuring Unicast Flood Blocking
Command
set port unicast-flood mod/port disable
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