Router reboot in a loop after IOS upgradation

[Farhan Jaffer]

When i upgrade my 3660 router from IOS 12.1(5)T5 to 12.3(20), the router reloads in a loop. After recovery i got following outputs against show flash command:

3 176236 crashinfo_19930301-000020 [deleted]

4 176251 crashinfo_19930301-000020 [deleted]

5 176236 crashinfo_19930301-000020 [deleted]

6 177969 crashinfo_19930301-000020 [deleted]

7 176236 crashinfo_19930301-000020 [deleted]

8 176251 crashinfo_19930301-000020 [deleted]

9 176235 crashinfo_19930301-000020 [deleted]

10 176256 crashinfo_19930301-000020 [deleted]

11 177953 crashinfo_19930301-000020 [deleted]

12 176251 crashinfo_19930301-000020 [deleted]

13 176255 crashinfo_19930301-000020 [deleted]

14 176236 crashinfo_19930301-000020

What could be the problem?

[glen.grant · Accepted solution]

Did you have adequate memory in the router for the new version , thats afairly big jump and that version has quite a bit higher memory requirements.

[Farhan Jaffer]

Yah, i had around 5.6 Mb free space

[Farhan Jaffer]

5.6 Mb free space flash & 90Mb+ RAM

[Farhan Jaffer]

Got the cause, that is the memory issue. thanks for support.

use more flash:cash... command

[Richard Burts]

Farhan

I have checked on CCO and it looks like most of the feature sets of 12.3(20) require 96MB of memory to run. I gather from your post that you have sufficient memory and sufficient flash.

There are several things that could produce the symptoms that you describe. It could be that the image that you are loading was corrupted while being transferred. I would suggest that you load a new copy of the image from CCO (be careful to verify that the transfer is successful) and then load the new image to the router. reboot and see if it works any better.

If you still have the problem then capturing and posting the messages sent to the console during boot would be very helpful in diagnosing your problem.

HTH

Rick