Cisco 3850 Switch Stuck at Booting

[fdharmawan]

Hi Guys,

So I have this switch on my deployment. It's on stack mode. Suddenly one of the stack members stopped working. Only SYST LED blinking. I tried to plug the console cable, but only got blank screen on the terminal. So I tried to reboot the switch, but unfortunately it stuck booting. I already wait for 10 minutes and no luck. So far I tried 3 times and got the same result.

Booting...
Interface GE 0 link down***ERROR: PHY link is down
Reading full image into memory....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................done
Bundle Image
--------------------------------------
Kernel Address : 0x5342d6a0
Kernel Size : 0x34e9ec/3467756
Initramfs Address : 0x5377c08c
Initramfs Size : 0x119e33d/18473789
Compression Format: mzip

Bootable image at @ ram:0x5342d6a0
Bootable image segment 0 address range [0x81100000, 0x81b8adc0] is in range [0x80180000, 0x90000000].
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
File "flash:cat3k_caa-universalk9.16.03.07.SPA.bin" uncompressed and installed, entry point: 0x816903a0
Loading Linux kernel with entry point 0x816903a0 ...
Bootloader: Done loading app on core_mask: 0x3f

### Launching Linux Kernel (flags = 0x5)

I know that it does not even reach POST check. Could it be something related to hardware? Is there anything that I can do for the switch? Thank you.

[Leo Laohoo]

Can you force the switch into ROMMON? 

[balaji.bandi]

have you removed this switch stack?

if not i will follow below steps :

1 Power off  the device having an issue.

2. remove from the stack

3, connect the console - go to recovery mode to get on to ROMMON

4. copy the same image to USB and boot from USB

5. if that works copy the image to flash and boot and test it.

6. all good change the switch number and priority and join the stack 

[fdharmawan]

Hi Balaji,

Sorry for late response. Just got the opportunity for physical access to the switch again at the office.

I tried booting from USB but the booting process stuck at the same stage as from flash. Is it a sign the switch is not recoverable?

[paul driver]

Hello

remove the switch from stack - attach a console cable and boot the switch post the output - if any

additionally you could power up switch and press and hold in the mode button of the switch and wait for the leds to turn amber then try and see if you begin to see any output in the terminal window if you do then you should be able to reset the switch.

[fdharmawan]

Hi Paul,

Sorry for late response. Just got the opportunity for physical access to the switch again at the office.

Can you elaborate more on reset the switch? I tried booting from USB but got stuck at the same point as before. I tried booting from USB and flash, then changing the power source from power supply only, power stack + PS, and power stack only.

Maybe I missed something.

[Leo Laohoo]

What is the exact model of this switch? 

Is this an "XS" model?

[fdharmawan]

Hi Leo,

The switch model is WS-C3850-24XU.

[Leo Laohoo]

---

@fdharmawan wrote:

The switch model is WS-C3850-24XU.

---

Leave the switch to boot overnight:  CSCvq53573 

[fdharmawan]

Hi Leo,

We did leave it up at boot stuck for days, and it did not even move from where it was. 

[Leo Laohoo]

---

@fdharmawan wrote:

We did leave it up at boot stuck for days, and it did not even move from where it was. 

---

Ok, Plan B:  Power down the switch (pull the power cable), wait until the power supplies stop screaming, apply power and force the switch into ROMMON. 
Load an OLDER IOS version, like 3.7.X, in Bundle Mode or Emergency-Install. 

See if this works.

[fdharmawan]

Hi Leo,

Okay. I will have the access to the switch this Thursday. I will update the progress here.

[fdharmawan]

Hi Guys,

Thank you very much for the input. I will do as suggested and post the update.

[balaji.bandi]

let us know how it goes ?

[fdharmawan]

Hi Balaji,

The boot from USB was still unsuccessful. It still stuck on the "### Launching Linux Kernel (flags = 0x5)".