[nsp] Cisco 1750 loses Ethernet input

[Ed Ravin]

On Sat, Jun 05, 2004 at 04:37:01PM -0400, Robert Boyle wrote:
> At 04:09 PM 6/5/2004, you wrote:
> >I've got a Cisco 1750 running IOS 12.1(20).  Every now and then
> >(the incidents are 1-3 months apart) it suddenly stops receiving
> >packets on its FastEthernet0 interface.  "show int faste0" says
> >that there is zero input.
> >
> >In the past, we've done things like reboot it or do a "shut/no shut"
> >on the interface in order to recover.  It just happened again today,
> >and I tried doing "clear interface FastEthernet0" and that worked
> >too!
> >
> >Is this a known problem with the 1700 series routers?
> 
> We have seen this when there is a duplex mismatch. Eventually, the router 
> just freaks out and stops seeing or sending any traffic. Forcing both sides 
> to match or making sure both are set to auto will usually fix the problem 
> permanently.

Nope, that wasn't the problem.  We'd checked that several times already.
In the meantime, a couple of days after I posted, the router gave up its
Ethernet completely - it claims the interface is up, lights are on, but
no traffic passed in either direction.  I guess it was hardware trouble.