3750X Stack IOS Upgrade

[TAEJUN YUN]

Hello,

I have to upgrade 3750X Stack's IOS.

There are four switches that are consist of one master and three stack member.

I wonder that It is possible to upgrade IOS without unplugging stack cables. 

 1) If It is possible, how can I upgrade IOS? 

     - I know that auto-upgrade feature doesn't work if IOS version's major number is different.

 2) or If It is impossible, I'd like to know how to upgrade. 

     - Is it required to unplug all of stack cables?

I'm really wondering about it !

[InayathUlla Sharieff · Accepted solution]

Hi,

Here you go. Download the bin file and then copy it to the switch:-

 so the commands are:
 
1.  copy tftp://<TFTP IP address>/filename.bin flash1:
2.  copy tftp://<TFTP IP address>/filename.bin flash2:
3.  copy tftp://<TFTP IP address>/filename.bin flash3:

4. copy tftp://<TFTP IP address>/filename.bin flash4:
 
No need to break the stack.  Once the BIN file is copied across all members of the stack, optionally you can verify the MD5 hash, and then you reboot.
https://supportforums.cisco.com/message/3933664#3933664

HTH

Regards

Inayath

*Plz rate if this info is helpfull.