Configuring LAN Interfaces

Configuring Fast EtherChannel

Configuring the Fast Ethernet Interfaces

To assign the Fast Ethernet interfaces to the Fast EtherChannel, use the following commands beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

interface fastethernet

Creates or modifies an existing Fast Ethernet interface and enters interface

 

slot/port-adapter/port

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.

 

 

 

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:

 

Command

Purpose

Step 1

 

 

interface fastethernet

Specifies the Fast Ethernet interface and enters interface configuration mode.

 

slot/port-adapter/port

 

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.

 

 

 

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

Cisco IOS Interface Configuration Guide

IC-36

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Cisco Systems IC-23 manual Configuring the Fast Ethernet Interfaces, IC-36

IC-23 specifications

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