2960X-48TD-L reloading when logging in

[Jernej Vodopivec]

Hi, I'm experiencing strange issue with two switches 2960X-48TD-L connected in a stack.

Switches were running 15.0.2-EX5(ED) for quite some time. We upgraded to latest recommended version 15.0.2a-EX5(ED) recently.

Every time we try to login throught ssh or telnet since the upgrade has been done  switches reload automatically.

Management can be still done through serial connection.

Here is the log message we can find in the console window when error occurs:

May 29 17:20:06.671: %SSH-5-SSH2_SESSION: SSH2 Session request from 192.168.1.10 (tty = 0) using crypto cipher 'aes256-cbc', hmac 'hmac-sha1' Succeeded

19:20:11 UTC Fri May 29 2015: Unexpected exception to CPUvector 200, PC = 1020

-Traceback= 0x1020z 0x1ABDB64z 0x2889D30z 0x429104z 0x429C28z 0x4308C4z 0x42E38Cz 0x42E738z 0xE01CE0z 0x1932E34z 0x1926A24z 0x27158E8z 0x270F928z

Writing crashinfo to flash:/crashinfo_ext/crashinfo_ext_4

I can't find any simmilar bug for this version in the Cisco bug toolkit.

Anyone experienced simmilar error?

[Reza Sharifi]

Hi,

The IOS you are running 15.0.2a-EX5(ED is the latest version available for the 2960X switches.

Can you try redoing the SSH again and test?  You should still open a ticket with TAC.

HTH

[Jernej Vodopivec]

The same problem happenes everytime we try to login to switch.

We downgraded software from 15.0.2a-EX5(ED) to 15.0.2a-EX5(ED) and issue is gone.

There must be a bug in 15.0.2a-EX5(ED) version.

[gaborlaszlo]

Exactly same issue here.

I don't know if I should downgrade or upgrade the Switches.

It is happen to Singleswitches and Stacks.

I have open up one TAC case and hope to receive Answer quickly because this issue block my schedule. 

[Jernej Vodopivec]

Hi Gabor, did you get any useful info from TAC yet?

[Jernej Vodopivec]

Hi, did you get any info from TAC center about this problem maybe?

[jonaskunze]

Same problem with my single 2960X-48FPS-L after upgrading to 15.0(2a)EX5.

Shut off the VTY lines to see if the that is the problem and the switch is running just fine. Any ideas?

[bret]

I had this same problem and after opening a ticket with TAC they said I was hitting CSCud90069 Failed ssh login with "login on-failure log" enabled causes A switch or router to crash or experience a spurious access when a user attempts to log into the device via SSH and is either successful, or fails to log in. I have updated to 15.2(2)E3 and no longer have the problem.

[jonaskunze]

The same for me. Updates to a newer version (15.2(2)E3) and the problem was gone.