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Configuring LAN Interfaces

Configuring Fast EtherChannel

IC-36

Cisco IOS Interface Configuration Guide

Configuring the Fast Ethernet Interfaces

To assign the Fast Ethernet interfaces to the Fast EtherChannel, use the following commands beginning

in global configuration mode:

Caution The port-channel interface is the routed interface. Do not enable Layer 3 addresses on the

physical Fast Ethernet interfaces. Do not assign bridge groups on the physical Fast Ethernet

interfaces because it creates loops. Also, you must disable spanning tree.

To remove a Fast Ethernet interface from a Fast EtherChannel, use the following commands beginning

in global configuration mode:

The Cisco IOS software automatically removes a Fast Ethernet interface from the Fast EtherChannel if

the interface goes down, and the software automatically adds the Fast Ethernet interface to the Fast

EtherChannel when the interface is back up.

Currently, Fast EtherChannel relies on keepalives to detect whether the line protocol is up or down.

Keepalives are enabled by default on the Fast Ethernet interfaces. If the line protocol on the interface

goes down because it did not receive a keepalive signal, the Fast EtherChannel detects that the line

protocol is down and removes the interface from the Fast EtherChannel. However, if the line protocol

remains up because keepalives are disabled on the Fast Ethernet interface, the Fast EtherChannel cannot

detect this link failure (other than a cable disconnect) and does not remove the interface from the Fast

Command Purpose

Step 1

interface fastethernet

slot/port-adapter/port

Creates or modifies an existing Fast Ethernet interface and enters interface

configuration mode.

Step 2

no ip address

Disables the IP address before performing the next step, if the Fast Ethernet

interface already exists and has an IP address assigned.

Step 3

channel-group channel-number

Assigns the Fast Ethernet interfaces to the Fast EtherChannel. The channel

number is the same as the channel number you specified when you created the

port-channel interface.

Step 4

exit

Exits interface configuration mode. Repeat Steps 1 through 4 to add up to four

Fast Ethernet interfaces to the Fast EtherChannel.

Step 5

end

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

when they have finished.

Step 6

show interface port-channel

Displays information about the Fast Ethernet interface so you can verify the

configuration.

Command Purpose

Step 1

interface fastethernet

slot/port-adapter/port

Specifies the Fast Ethernet interface and enters interface configuration mode.

Step 2

no channel-group

Removes the Fast Ethernet interface from the channel group.

Step 3

end

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

when they have finished.

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