Hi... I'm looking for some opinion on this topic, i've done a bit of reading but can't find much about how SPs and Enterprise manage Ethernet based services.
So in a senario where we have:
Site A CPE >> Carrier NTU >> L2WAN >> Carrier NTU >> Site B CPE
If there is a fault condition in the L2 WAN it would be most likly that CPE interfaces would remain in an UP/UP state. If there were resilient links between Site A and B you would not get a Site Down Type Alarm. Obviously any L3 routing protocol would go down but there must be a clever way round paying for a licence to monitor BGP states and one of the ways i have read about which is using tunnel keep alives just seems messy.
Has anyone done anything smart to try and work arround this problem or do we all just buy the bolt on's for our chosen network management platform?