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ISR4331/4221 Software Releases - Gibraltar vs Amsterdam

Bilal Al-Sardar
Level 1
Level 1




Kindly I am looking for your advise on which software release to choose (Amsterdam-17.3.5 OR Gibraltar-16.12.5) if I want to upgrade Cisco ISR4331/4221 routers. Both are recommended S/W releases, although Gibraltar consumes Smart-license which we are not using currently.


Thanks & Regards,

7 Replies 7

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Personally i would go to 17.3.X version that is moving forward, eventually you need to go that version, soon or later 16.X going to be end of Life.


read the release notes :


here is smart License :


You can contact License team to conver the License for you.


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Hello Balaji,


Thanks for the prompt response, appreciated.





 According to my experience with TAC, I think the obvious version is the newer one. We know however that the newer the version more risky as we dont know what we are about to face in terms of bugs. 

 So,  my advise is if you are already running a version and it is stable and you are facing no problem, keep the version. But, if you are building something new or need some specific  feature, then go to newer recommend version.

Hello Flavio,


I totally agree with you. although the current version is stable and I am not facing any serious issues whatsoever. but you can say it is a mandatory procedure in our environment due to the security vulnerability reports.

I get that.  I used to work for a Bank in the recently past and we faced this challange all the time. Handling newer version due security concern although currently version was doing just fine. 

Level 1
Level 1

Ive seen bugs with 17.3. I'd be interested to hear if 17 other than 17.3 are fairing better

Currently using Amsterdam 17.3.5 on ISR4331 licensed with (security bundle), I didn't face any issues (Bugs, Crashes, etc...) whatsoever.

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