[c-nsp] Switch lights rapid blinking

[Michael Sprouffske]

I'm about to do a port mirror to see whats going on with that.  Every port on every switch blinks at the same time as fast as they can.  I don't see any issues with spanning tree changing.  I did some netflows and don't see anything out of the norm with that.  Hopefully port mirror will shed some light.




________________________________
 From: "A.L.M.Buxey at lboro.ac.uk" <A.L.M.Buxey at lboro.ac.uk>
To: Michael Sprouffske <msprouffske at yahoo.com> 
Cc: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net> 
Sent: Monday, January 28, 2013 11:21 AM
Subject: Re: [c-nsp] Switch lights rapid blinking
 
Hi,
> Can someone please point me in the right direction to correct this issue.  I came into a network that is using the default vlan and for about 2 weeks now, every switch and port is rapidly blinking.  I looked at wireshark and don't seen anything out of the ordinary.  I also checked for loops in the network and don't see any.  Is there some tool I can use to track down what is causing this?  I'm running cisco 2960's all over.

if all the usual things are okay - ie spanning-tree is stable, there are no links going up/down, 
you have eg portfast for edge devices etc etc then perhaps all you are seeing are the usual busy
lights for cisco LEDs - what sort of rapid blinking? all blinking at same time?  have you done a
port-mirror of the uplink to see what is really going on?

alan