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Downgrading a c3750X to IOS 12.2.55-SE8

HI guys, I couldn't find a page with a breakdown of features I'll lose when downgrading from IOS 15 to 12. Do you guys know what features I'd lose/gain or point me on the right track?

Thanks.

2 ACCEPTED SOLUTIONS

Accepted Solutions
VIP Super Bronze

Downgrading a c3750X to IOS 12.2.55-SE8

Hi Lorenzo,

You would need to go through the release notes and look at the major sections.  A lots of changes are bug fix related, so you may not loose any feature.  I don't remeber a significant feature that is in IOS 15 and not in 12.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se/release/notes/OL23053.html

for 15

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/15.0_1_se/release/notes/OL25302.html

HTH

New Member

Downgrading a c3750X to IOS 12.2.55-SE8

Hello,

For future reference...

You can use the feature navigator to compare features between two images:

http://tools.cisco.com/ITDIT/CFN/jsp/compareImages.jsp

Regards,

Sony

10 REPLIES
VIP Super Bronze

Downgrading a c3750X to IOS 12.2.55-SE8

Hi Lorenzo,

You would need to go through the release notes and look at the major sections.  A lots of changes are bug fix related, so you may not loose any feature.  I don't remeber a significant feature that is in IOS 15 and not in 12.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/12.2_55_se/release/notes/OL23053.html

for 15

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/software/release/15.0_1_se/release/notes/OL25302.html

HTH

Hall of Fame Super Gold

Downgrading a c3750X to IOS 12.2.55-SE8

Before you downgrade from one bad IOS version to another bad IOS version, what is your CURRENT IOS version?

Downgrading a c3750X to IOS 12.2.55-SE8

I was going to install the latest IOS 15 version as opposed to the factory shipped image which i believe is 12.2.55-SE5.

So technically i'm still upgrading the switch but since my boss wanted it to run the latest IOS version I wanted a breakdown of bugs/features present on both versions.

Bronze

Re: Downgrading a c3750X to IOS 12.2.55-SE8

Sooooo out of curiosity why are you looking to downgrade? High CPU?

I don't know offhand of any major features in 15 not in 12. Something to watch out for is the microcode will be downgraded in the process, and that takes about 25 minutes. So expect 30 minutes of downtime for the switch

Sent from Cisco Technical Support iPad App

Hall of Fame Super Gold

Re: Downgrading a c3750X to IOS 12.2.55-SE8

Something to watch out for is the microcode will be downgraded in the process, and that takes about 25 minutes. So expect 30 minutes of downtime for the switch

I've downgraded from 15.0 to 12.2(55)SE7 and I've never seen a microcode downgrade before.

I don't know offhand of any major features in 15 not in 12.

You remember those scary stories your parents tell you before you go to sleep and keeps you up all night?  IOS version 15.0 is much, much worst than those scary stories.  Currently, 15.0(2)SE4 is looking like a "mature" version.  Any versions  is something to avoid like a bad case of the flu.

Personally, I wouldn't install any 15.0 IOS (execpt for the SE4) in the network unless tomorrow is your last day. 

NOTE:  Hence, the reason why I am keeping 15.0(2)SE3 in my files.  LOL!

Downgrading a c3750X to IOS 12.2.55-SE8

The reason behind this is because i will mix 3750x and 3750 on a switch stack and as you know they need to be running the same IOS versions.

I didn't see IOS 15 available for the 3750 but after you guys have said about that version I'm not even interested on it anymore lol

New Member

Downgrading a c3750X to IOS 12.2.55-SE8

Hello,

For future reference...

You can use the feature navigator to compare features between two images:

http://tools.cisco.com/ITDIT/CFN/jsp/compareImages.jsp

Regards,

Sony

Downgrading a c3750X to IOS 12.2.55-SE8

Sonywen Gouldbourne wrote:

Hello,

For future reference...

You can use the feature navigator to compare features between two images:

http://tools.cisco.com/ITDIT/CFN/jsp/compareImages.jsp

Regards,

Sony

This tool is awesome! Thanks bunch.

Hall of Fame Super Gold

Re: Downgrading a c3750X to IOS 12.2.55-SE8

I didn't see IOS 15 available for the 3750

Most likely because your 3750 only has 16 mb flash.  IOS version 15.0 is supported on models with 32 mb flash.

If you have at least one 3750 in a stack and with 16 mb flash, then I'd recommend you use 12.2(55)SE8.  Starting from 12.2(55)SE7, this version is considered (in my books) as one of THE MOST STABLE/mature IOS I've ever come across. 

New Member

Re: Downgrading a c3750X to IOS 12.2.55-SE8

We had a pair of 3750G's running stable forever, even w/ an old version of 12.2(44)SE5.

A colleague just replaced one of them w/ 3750X, (3750G reached EoX status) running 15.0(2)SE2.

We don't do anything fancy...just BGP & HSRP.

After the switch replacement, HSRP would flap every 60 minutes, which is driving us crazy. (HSRP peer w/ the remaining 3750G, which is to be replaced next week)

We didn't change any config between the old & new switches - straight up copy & paste...WTF?!

Our plan was to run a SPAN, and see which HSRP hello's were missed/dropped, but if the switch is dropping the hello's, the SPAN data probably isn't reliable either.

We'll probably rollback the change, and put the old 3750G back in place, or downgrade to 12.2(55)SE8 per Leo's advise.

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