3750 Stack version mismatch problem

[newfabcom]

Hi, I am running a 3750E-48PD switch with firmware 15.2.SE1 UniversalK9 firmware as a master and I want to stack to a 3750G-16TD currently running 12.2(35)SE5 IP-Base. When i try to stack them I get a "booting in mismatch mode" and then it hangs. I understand the versions should match, but there is no UNIVERSAL version for the 3750g-16TD Switch. What can I do to make the stack work?

Thanks for any help.

[Leo Laohoo · Accepted solution]

3750G/X supports 15.1 and later.  3750/G do NOT support 15.1 and later.  

You'll need to downgrade the IOS of the 3750E.

[newfabcom]

Hi, thanks! I downgraded to 12 and now my stack works. any idea if I am missing out major differences with 12 instead of 15?

[Leo Laohoo]

any idea if I am missing out major differences with 12 instead of 15?

Thanks for taking the time to rate our posts. 

Can't really tell because I don't know what your network is like.  But if your network is plain "vanilla" (voice VLAN, data VLAN and no funky stuff like 802.1X) then you're not missing much.  

As a matter of fact, the most stable IOS for the 3560- & 3750-series family of switches is still 12.2(55)SE.  So if you want to consider this version, then look at 12.2(55)SE10.