Install a new 3750 into the exising stack

[varundhanda]

Hi Guys,

I have to install a new 3750 switch(switch 5) into the existing stack of four switches with a new 3 meter stackwise cable.

My question is if remove the existing cable coming from switch 1 (master) to switch 4 would it affect anything. Please see the attached diagram.

can anyone give the steps on how to perform this

Thank you.

[Leo Laohoo]

As long as you remove or relocate the stack cable one at a time, the rest of the stack should be fine.  This is what I'd recommend you do:

1.  Install the new switch but DO NOT apply power;

2.  Move one stack cable to the new stack member;

3.  Apply power and wait for the stack master to recognize the new stack member;

4.  Relocate the last stack cable.

Make sure you take advantage of the "switch X provision" subcommand before doing anything.

[varundhanda]

Thank for your reply leolaohoo.

Another thing i wanted to add is, all the existing 3750 switches are 24 ports but the new switch i wanted to add is 48 ports.

The switch type is different. Do i need to add specefic commands to make it compatible with the existing switch.

[Latchum Naidu]

Hi,

You can do that without any issues, please find the below discussion for the same.

http://blog.qsolved.com/2011/05/is-it-possible-to-stack-3750g-and-3750x.html

http://www.learnios.com/viewtopic.php?f=16&t=12983

Please rate the helpfull posts.
Regards,
Naidu.

[Jean-Pierre Burlet]

Hi,

before you take the switch in the cluster, you need to change the priority. He may not have the same Priortät as another switch. He needs the small neste priority.

switch#sh sw

Switch/Stack Mac Address : 1111.2222.3333

                                           H/W   Current

Switch#  Role   Mac Address     Priority Version  State

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

*1       Master 1111.2222.3333     15     0       Ready              

  2      Member 4444.5555.6666    12     0       Ready              

  3      Member 7777.8888.9999     9      0       Ready              

  4      Member 0000.1111.2222     6      0       Ready    

Regards,

JP

[varundhanda]

Thanks Naidu,

Will the master switch(3750G-24T) automatically copy the IOS to the new 3750X-48T-S switch or do i have to do it manually. Please see the show version output from 3750G-24Tand 3750X-48-T.

3750G-24T(existing stack master)

Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2007 by Cisco Systems, Inc.

cisco WS-C3750G-24T (PowerPC405) processor (revision N0) with 118784K/12280K bytes of memory.

Processor board ID FDO1303Z0AQ

3750X-48T-S(new switch)

Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(55)SE1,RELEASE SOFTWARE (fc1)

cisco WS-C3750X-48 (PowerPC405) processor (revision A0) with 262144K bytes of memory.

Processor board ID FDO1505P0F6

[Latchum Naidu]

You are most welcome varundhanda...

And yes, once you added the new switch to stack then the stack master will automatically configure the new unit with running IOS.

See the below link for your reference.
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_white_paper09186a00801b096a.html

Please rate the helpfull posts.
Regards,
Naidu.

[Leo Laohoo · Accepted solution]

Will the master switch(3750G-24T) automatically copy the IOS to the new 3750X-48T-S switch or do i have to do it manually. Please see the show version output from 3750G-24Tand 3750X-48-T.

This won't work.  There's no chance in he11 the 3750X will be able to join the stack because the existing stack is running an IOS version (12.2.35) that the 3750X can't "understand".  You will need to upgrade the existing stack to at least 12.2(53)SE2 or later to get the 3750X to join the stack.

Message was edited by: Leo Laohoo

[varundhanda]

Hi leolaohoo,

Thanks for the reply.

I suspected that, this is why i mentioned the IOS version earler.

Well, the problem is 3750G stack are production switches and i would like to upgrade the stack with a minimal outage.

Do i just need to update IOS on the Master switch? i believe that will copy the IOS on the member switches.

[Reza Sharifi]

Hi,

Use a .tar file to upgrade the entire stack.  You also need an outage window, so you can reboot the stack after the completion.

Have a look at this doc for step-by-step instructions.

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_example09186a00804799d7.shtml#maintask1

HTH

Reza

[varundhanda]

Can i downgrade the new 3750X-48T switch to same image which are being used by 3750G-24T switches?

Or 3750X is not compatilble with IOS version (12.2.35)

[Leo Laohoo]

Do i just need to update IOS on the Master switch?

That defeats the full purpose of the 3750 is you copy an IOS to the master stack without updating the stack member. Besides, if you do this then the remainder of the stack running different IOS to the stack master won't be able to join the stack.

You need to update the entire stack first before you add the 3750X.  3750X is supported from IOS version 12.2(53)SE2.

[varundhanda]

Hi,

THANKS for the reply guys.

Is it possible to downgrade the IOS image of 3750X - 48T from UNIVERSALK9-M Version 12.2(55)SE1to IPBASE-M, Version 12.2(35)SE5(same as 3750g 24T)

Thank you.

[Latchum Naidu]

Hi,

You can do that..Remember the both switches must have same IOS or else it wont joing in stack.

Also see the below link for more infor and for troubleshooting purpose and guide lines.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/troubleshooting/switch_stacks.html#wp40112

Please rate the helpfull posts.
Regards,
Naidu.

[Leo Laohoo · Accepted solution]

Is it possible to downgrade the IOS image of 3750X - 48T from UNIVERSALK9-M Version 12.2(55)SE1to IPBASE-M, Version 12.2(35)SE5(same as 3750g 24T)

No you can't.  3750X is supported from IOS version 12.2(53)SE2.