[c-nsp] Switch lights rapid blinking

[Jeffrey G. Fitzwater]

Alan, there are many normal things that can cause this, like ARP broadcast, unknown unicast especially in a large flat nets.

   I  would start there, but remember it might be normal.


Jeff Fitzwater
OIT Network Systems
Princeton University
 wrote:

> 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
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