Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Etherchannel - err disabled

Hello, I'm practicing forming Etherchannel groups and I have a question. I have two switches with Fa 0/5, 6 ,7 as trunks between the switches. When create the Po1 adding each interface one by one (first in one SW and then in the other SW) my Po1 goes to an err-disabled status in the first SW. Then I have to enter into the Po1 interface, apply a shutdown and then a no shutdown and then the Po1 comes up........ is this a normal behavior when you add each interface one by one to the Po? .... see the attachment.

When I create the Po1 by adding the 3 interfaces together (int range fa 0/5 - 7) in one SW the interfaces go down. Then I do the same in the other SW and once the Po1 has been configured in both SWs the Po1 comes up by itself I dont have to apply a shu/no shut to the Po1 interface.

Is there a way to create a Po without interrupting traffic? What is the normal or best way to create the Po?

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Etherchannel - err disabled

Francisco, Hi It's me again!

I'd recommend you to do as follows:

- Shut all interfaces in the channel down on both sides. To avoid the order operation problems.

- start configuring Etherchannel all interfaces.

- Make sure that all interfaces have identical configuration.

- Bring all interfaces back up.

You can use a "show interface status err-disabled" command to see what's the problem.

Hopes this link can help you some:

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00806cd87b.shtml

HTH,

Toshi

3 REPLIES

Re: Etherchannel - err disabled

Francisco, Hi It's me again!

I'd recommend you to do as follows:

- Shut all interfaces in the channel down on both sides. To avoid the order operation problems.

- start configuring Etherchannel all interfaces.

- Make sure that all interfaces have identical configuration.

- Bring all interfaces back up.

You can use a "show interface status err-disabled" command to see what's the problem.

Hopes this link can help you some:

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00806cd87b.shtml

HTH,

Toshi

New Member

Re: Etherchannel - err disabled

The link explains it all.... thanks Toshi.

Purple

Re: Etherchannel - err disabled

That is normal behavior . When creating etherchannels particularly negotiated ones such as LACP or PAGP all ports have to be brought up at the same time via the port channel interface , not the individual interfaces in the group.

1563
Views
0
Helpful
3
Replies