problems add new switch to stack

[huwyhuwy123]

hi there,

We had an existing stack of 2x 3750s.

I've been trying to add a new 3750 to the stack but I've had problems.

I've upgraded all of the 3750s to the latest IOS.

The first 2 3750s I power up will form a stack, the third won't join the stack. e.g. if I power up one of the old 3750s and the new 3750 they will form a stack. When I port on the last 3750 it doesn't join the stack.

I was wondering if this might be down to not having fully redundant stackwise cabling? See the attached photo. I need to order another cable.

If its not this can anyone suggest what the issue might be?

Cheers,

Huw

[Reza Sharifi · Accepted solution]

Hi,

Did you provision the new switch to be added to the stack?

Do you have the correct priority set up for the master?

Have a look at this doc.  It explains how to add a switch to the stack

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_25_sec/configuration/guide/swstack.html#wp1177470

HTH

Reza

[Leo Laohoo]

The first 2 3750s I power up will form a stack, the third won't join the stack. e.g. if I power up one of the old 3750s and the new 3750 they will form a stack. When I port on the last 3750 it doesn't join the stack.

Please post the following output:

1.  sh version

2.  sh stack detail

[huwyhuwy123]

I've attached output from both switches.

I will take a look at the document linked.

Cheers for your help!

[Leo Laohoo]

Can you confirm that the 3rd switch is running 12.2(55)SE3 IOS with IP Services feature set?

Can you power down 3rd switch, attach a console cable, power up and paste the entire bootup process up to the point it will try to join the stack?

[huwyhuwy123]

Thanks for the help guys. I reseated the stack cables. Wiped the new switch and re-provisioned it according to that doc.

Now all working.

Cheers!