I'm facing an ethernet cabling mistery.
My company owns a Cisco 2821 router.
This cisco is connected throught Fastethernet to a Cisco 2801 owned by a Telco operator.
Everything was working fine for almost a year.
Last week end, after a power failure, the link appeared to be down on the router ( Link Up, Protocol Down )
I solved the problem changing the cable between these two routers with a cross cable.
The previous cable appeared to be a staight cable !?!
I'm wondering... how could it work for almost a year?
Is there a way to activate some auto crossing protocol on a Fastethernet Interface (MDI-X?) or was there some mysterious changes on my network?
ip address XXX XXX
ip access-group external3 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no mop enabled
standby 1 priority 80
Thanks for your help