Protected Port Configuration Guidelines; Configuring A Protected Port; Configuring Port Blocking; Default Port Blocking Configuration - Cisco IE 3000 Software Configuration Manual

Chapter 22 Configuring Port-Based Traffic Control

Protected Port Configuration Guidelines

You can configure protected ports on a physical interface (for example, Gigabit Ethernet port 1) or an
EtherChannel group (for example, port-channel 5). When you enable protected ports for a port channel,
it is enabled for all ports in the port-channel group.

Configuring a Protected Port

Beginning in privileged EXEC mode, follow these steps to define a port as a protected port:
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3
switchport protected
Step 4
end
Step 5 show interfaces interface-id switchport
Step 6 copy running-config startup-config
To disable protected port, use the no switchport protected interface configuration command.
This example shows how to configure a port as a protected port:
Switch# configure terminal
Switch(config)# interface gigabitethernet1/1
Switch(config-if)# switchport protected
Switch(config-if)# end

Configuring Port Blocking

By default, the switch floods packets with unknown destination MAC addresses out of all ports. If
unknown unicast and multicast traffic is forwarded to a protected port, there could be security issues. To
prevent unknown unicast or multicast traffic from being forwarded from one port to another, you can
block a port (protected or nonprotected) from flooding unknown unicast or multicast packets to other
ports.
These sections contain this configuration information:
•
•

Default Port Blocking Configuration

The default is to not block flooding of unknown multicast and unicast traffic out of a port, but to flood
these packets to all ports.
OL-13018-01
Default Port Blocking Configuration, page 22-7
Blocking Flooded Traffic on an Interface, page 22-8
Purpose
Enter global configuration mode.
Specify the interface to be configured, and enter interface
configuration mode.
Configure the interface to be a protected port.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco IE 3000 Switch Software Configuration Guide
Configuring Port Blocking
22-7