Questions related to IOS

[vijay kumar]

I have few questions related to IOS ...

1. Which is the preffered one if the ios release has ED/GD/MD ?

2. Is cisco 2921 router will support 12.x series ios ?

[Leo Laohoo · Accepted solution]

Is cisco 2921 router will support 12.x series ios ?

No.

1. Which is the preffered one if the ios release has ED/GD/MD ?

I prefer the latest IOS. But that's just me. 

GD means General Deployment.

ED means Engineering Deployment.  This means IOS was developed to support a hardware.

MD means Maintainance Deployment.  IOS was developed to fix a bug.

I'd go for GD or MD. 

[vijay kumar]

Thanks for the reply.

It would be better if i have answer for 2nd question too

[Leo Laohoo]

It would be better if i have answer for 2nd question too

I did respond to your 2nd question. 

[cadet alain · Accepted solution]

Hi,

As Leo stated , the 2921 won't support 12.x IOS because it is an ISR G2 and these new platforms only support 15.x IOS because of the licensing feature not supported by IOS 12.x

Regards

Alain

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[vijay kumar]

Thanks for the reply !!!

It would be better if you elabrate the second question, coz i heard that it ED is the release where ios is not bug fixed and md is bug fixed. Is it correct???

[cadet alain]

Hi,

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6968/ps6350/product_bulletin_cisco_ios_software_gd_program_retirement.html

Regards

Alain

Don't forget to rate helpful posts.

[Joseph W. Doherty]

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Posting

vijay kumar wrote:
Thanks for the reply !!!
It would be better if you elabrate the second question, coz i heard that it ED is the release where ios is not bug fixed and md is bug fixed. Is it correct???

I believe ED releases get bug fixes but MD releases have longer release life.