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Redundant Links with STP

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Let's try to configure EtherChannel between the switches again:

Todd5000> (enable) set port channel 1/1-2 on

Port(s) 1/1-2 channel mode set to on.

Todd5000> (enable) 1997 Jul 25 23:08:20 %PAGP-5-PORTFROMSTP:Port
1/1 left bridge port 1/1

1997 Jul 25 23:08:20 %PAGP-5-PORTFROMSTP:Port 1/2 left bridge
port 1/2

1997 Jul 25 23:08:20 %PAGP-5-PORTTOSTP:Port 1/1 joined bridge
port 1/1-2

1997 Jul 25 23:08:21 %PAGP-5-PORTTOSTP:Port 1/2 joined bridge
port 1/1-2

To verify the EtherChannel bundle, use the show port channel

command:

Todd5000> (enable) sh port channel

Port Status Channel Channel Neighbor Neighbor

mode status device port

----- ---------- --------- ----------- ---------------------

1/1 errdisable on channel

1/2 errdisable on channel

----- ---------- --------- ----------- ---------------------

Todd5000> (enable)

You can see that the status is error disabled and that no neighbors are

found. This is because we still need to configure Fast EtherChannel on the
1900 switch. If this were a remote switch, you would lose contact with the
switch and have to go to the site and console into the switch to configure
EtherChannel. You should configure the remote site first; then you will lose
contact with it until you configure the local switch bundle.

To configure the EtherChannel bundle on a 1900 switch, use the port-

channel mode

command:

1900A(config)#port-channel mode ?

auto Set Fast EtherChannel mode to AUTO

desirable Set Fast EtherChannel mode to DESIRABLE

off Set Fast EtherChannel mode to OFF

on Set Fast EtherChannel mode to ON

1900A(config)#port-channel mode on

That is all you can configure on the 1900. The switch will look for the

neighbor device ID and neighbor group capability that are the same and

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