Adding switches to the switch stack

[hamidul.islam]

Hi there,

We have a stack of 2, 3750 cisco switches. OS version is 12.2 and switch priorities 15 and 10. We will add 2 more 3750 switches on the existing stack. I am not sure about the OS version yet of the new switches as they will be shipped soon.

I need to know the following:

1) Do i have to make sure that the OS versions of new switches and the old switches should be exactly same? If not same then do i have to preload the same os version?

2) The new switches will have priority 1 and do I have to change the priority before adding to the stack as both of the switches has the same priorities 1 or it will be automatically handled by the stack master?

3) what are the other prerequistes I have to take care before adding the new switches?

thanks.

[ranraju]

1. Yes, while adding the new switches into the stack you need to have the same IOS image running on each switch that you add.

2. You do not have to change the priority of the new switches, you just need to make sure that the stack master has the highest priority assigned (which is 15).

3. Power down the new switch and then plug the stack cables, then power up the new switch.

With these you should be good to bring up the stack.

Hope this answers your questions on this post.

regards,

ranraju

(TAC)

[hamidul.islam]

Thanks for the information.

If the OS version is not same and I need to copy that to the new switch then:

1) When I give show flash command, I can see many entries like  c3750-advipservicesk9-mz.122-25.SEE4.bin [I believe this is the IOS image]. How can I identify the right image file?

2) To copy the image from the existing switch to new switch will the following process work? It would be nice if you can get me the commands.

copy the image first to the TFTP from existing switch and then TFTP to new switch

Thanks for your help.

[ranraju · Accepted solution]

1. show verison command should tell you what image you are running..

it should look something like this:

Time since SWITCHA is active is 26 minutes
System returned to ROM by power cycle at 08:59:23 UTC Tue Mar 30 1993
System image file is "flash:c3750-advipservicesk9-mz.122-25.SEE4.bin"

2. Download the image onto the switch and verify the image with the following commands.

switch#copy tftp flash
Address or name of remote host []? 10.10.10.1                               <<< TFTP address
Source filename []? c3750-advipservicesk9-mz.122-25.SEE4.bin       <<< image name that you want to copy
Destination filename [c3750-advipservicesk9-mz.122-25.SEE4.bin]?   <<< just press enter here.

switch#dir flash
switch#verify flash:c3750-advipservicesk9-mz.122-25.SEE4.bin           <<< verifies the image's integrity

Change the system boot string to the new image in the flash.

switch#show boot
switch#configure terminal
switch(config)#boot system flash:c3560-ipbasek9-mz.122-44.SE.bin
switch#exit
switch#show boot   <<<< verify the boot-string if updated correctly.

Then save the config, and reload.

switch#write memory
switch#show version
switch#reload

After it reboots

switch#show ver           <<<< check if you the switch has come up with the new image

So with this you should be able to upgrade each switch.

Hope this was helpful.

Please rate useful posts.

Regards,

ranraju

(TAC)

[hamidul.islam]

Hi,

Can you tell me the difference between the following 2 OS versions:

12.2(25) SEE4 and 12.2(40) SEE4

1.What is the 25 and 40 indicates?

2. To implement the stack does this 25 and 40 should also match?

Thanks