Cisco Support Community
Community Member

3750 version mismatch in a mixed stack.


I would like to add three 3750X switches to my current production stack of four 3750 switches.  I was getting a version mismatch on the 3750X switches after stacking them all together. I disconnected the 3750X switches and tried to downgrade them to to match the 3750 switches but couldn't because Cisco does not have a older IOS for the 3750X.  My only option seems to be to upgrade the stack of four 3750 switches.  My question is if I upgrade the 3750 switches to IOS version 12.2(53)SE2 with an IPBASE feature set will that solve the version mismatch problem?  I am guessing the error came up because some were on an SE5 release and some were on and SE2 release.

Switch   Ports  Model              SW Version              SW Image
------   -----  -----              ----------              ----------
*    1   52     WS-C3750G-48TS     12.2(35)SE5             C3750-IPBASE-M
     2   52     WS-C3750G-48TS     12.2(35)SE5             C3750-IPBASE-M
     3   52     WS-C3750G-48PS     12.2(35)SE5             C3750-IPBASE-M
     4   52     WS-C3750G-48PS     12.2(35)SE5             C3750-IPBASE-M

3750X Version information - I have three of these.


Switch Ports Model              SW Version            SW Image
------ ----- -----              ----------            ----------
*    5 54    WS-C3750X-48       12.2(53)SE2           C3750E-UNIVERSALK9-M


Re: 3750 version mismatch in a mixed stack.


You're right, your only option here is to upgrade the 3750 switches to the same version as the 3750X ones because 3750X switches cannot run older IOS versions. Once you upgrade them to the same version, the stack should work properly.

Q. Are mixed stacks supported?

A. It depends. The Cisco StackWise and StackWise Plus solutions are flexible enough to allow you to:

• Stack any Cisco Catalyst 3000 switch in the same stack (hardware mixed stack)

• Stack any Cisco IOS Software feature set in the same stack (software mixed stack)

One exception is the new LAN Base models being introduced with the Catalyst 3750-X and 3560-X Series, which can stack only with other LAN Base models.

From 3750-X Q&A on the following link:


CreatePlease to create content