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Configuring LAN Interfaces

Configuring Fast EtherChannel

IC-35

Cisco IOS Interface Configuration Guide

Configuring the Port-Channel Interface

To configure the port-channel interface, use the following commands beginning in global configuration

mode:

Note If you want to use the Cisco Discovery Protocol (CDP), you must configure it on the

physical Ethernet, Fast Ethernet, or GigabitEthernet interface, not on the port-channel

interface.

Caution With Release 11.1(20)CC and later, Fast EtherChannel supports CEF/dCEF. We

recommend that you clear all explicit ip route-cache distributed commands from the Fast

Ethernet interfaces before enabling dCEF on the port-channel interface. Doing this gives

the port-channel interface proper control of its physical Fast Ethernet links. When you

enable CEF/dCEF globally, all interfaces that support CEF/dCEF are enabled. When

CEF/dCEF is enabled on the port-channel interface, it is automatically enabled on each of

the Fast Ethernet interfaces in the channel group. However, if you have previously disabled

CEF/dCEF on the Fast Ethernet interface, CEF/dCEF is not automatically enabled. In this

case, you must enable CEF/dCEF on the Fast Ethernet interface.

Command Purpose

Step 1

interface port-channel

channel-number

Creates the port-channel interface and enters interface configuration mode. The

channel number can be 1 to 4.

Step 2

ip address ip-address mask

Assigns an IP address and subnet mask to the Fast EtherChannel.

If you configure ISL, you must assign the IP address to the subinterface (for

example, interface port-channel 1.1—an IP address per VLAN) and you must

specify the encapsulation with VLAN number under that subinterface (for

example, encapsulation isl 100).

Step 3

mac-address ieee-address

(Optional) Assigns a static MAC address to the Fast EtherChannel.

If you do not assign a static MAC address on the port-channel interface, the

Cisco IOS software automatically assigns a MAC address. If you assign a static

MAC address and then later remove it, the Cisco IOS software automatically

assigns a MAC address.

Step 4

end

(Optional) Enables other supported interface commands to execute, and exits

when they have finished.

Step 5

show interface port-channel

Displays information about the port-channel interface so you can verify the

configuration.

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