[c-nsp] 1841 dumps to rommon only on power failure

[Vinny Abello]

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Thanks... I'm going to try and reproduce it this weekend. It's actually connected to an APC power distribution bar. That thing actually boots up itself before supplying power to the ports so it's not like there is suddenly a jolt of power coming from the utility when it's restored. I still have a feeling it has something to do with how long it's been without power, but I'm not sure why. I'll try to narrow it down and post back any findings to the list in case it helps someone in the future.



- -Vinny



On 7/18/2011 5:50 AM, Henry-Nicolas Tourneur wrote:

> I would say: your issue sounds to be physical not software related. 

> Probably there's some weird happening on your power circuit when it goes

> down, otherwise you should have the same issue with the power switch.

> Since it's hard to say what happens when your power source goes down, it'll

> be hard for us to tell you the exact cause.

> 

> You should try to reproduce the conditions of the power cut, if the power

> switch doesn't work, try shutting down your fuse, if possible.

> When you succeed to reproduce the conditions, try moving your router to

> another location and see if it behave the same way.

> If it does, then your router might be faulty, if it doesn't, then you might

> have an issue with your power circuit.

> 

> Hope it helps,

> 

> -----Original Message-----

> From: cisco-nsp-bounces at puck.nether.net

> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Vinny Abello

> Sent: lundi 18 juillet 2011 5:58

> To: cisco-nsp at puck.nether.net

> Subject: [c-nsp] 1841 dumps to rommon only on power failure

> 

> Got an interesting problem I thought someone else might have 

> experienced. I have an 1841 in my home that I've used for a while. 

> Recently (probably within the past year) I noticed that when it looses 

> power, the next time it powers on it doesn't boot properly and just gets 

> dumped to rommon. This problem may have existed far longer as it used to 

> be on a UPS, but now is just on a surge protector. I know what everyone 

> is going to say, your config registers aren't set properly... Well, yes 

> they are. I've verified the config register being 0x2102 a dozen times 

> now and even reset it a few times to be sure. The odd thing about this 

> is if I simply reboot it again, it starts fine. Even if I power cycle it 

> with the rocker switch it boots up fine. I literally cannot reproduce 

> the problem by powering it off and back on, yet every time there is a 

> power failure, it fails to load IOS and a reboot is the quick fix. This 

> kind of stumped me having used Cisco routers and switches of all types 

> for many many years now. The only thing I could think of is that somehow 

> the lack of power for an extended period is causing it. Could this 

> behavior be caused by the battery on the main board being too low of 

> voltage? I think it was rated for 3.3 volts and measuring slightly over 

> 3 volts but my memory may be foggy on that. Any other thoughts (other 

> than put it on a UPS like it used to be)? :)

> 

> Thanks for any thoughts...

> 

> -Vinny

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