Configuring LAN Interfaces

Configuring Fast EtherChannel

Configuring the Port-Channel Interface

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

 

Command

Purpose

Step 1

 

 

interface port-channel

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

 

channel-number

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.

 

 

 

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.

Cisco IOS Interface Configuration Guide

IC-35

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Cisco Systems IC-23 manual Configuring the Port-Channel Interface, IC-35

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