Protocol that spots a failed ExpressRoute link in less than a second. Microsoft's MSEE routers already have it on for new peerings, so you enable it on your own edge routers and tie it to the BGP session.
Also called Bidirectional Forwarding Detection.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains BFD in context, with comparison tables and the common traps.
Terms in this definition
- ExpressRoute
A dedicated private link between on-premises networks and Azure, using Microsoft peering or private peering.
- MSEE
Microsoft Enterprise Edge, the routers on which ExpressRoute circuits terminate. Their BGP defaults are a 60-second keep-alive and a 180-second hold time.
- BGP
Dynamic routing protocol used with both ExpressRoute and VPN connections. On ExpressRoute private peering it is the only way to exchange routes, including a 0.0.0.0/0 default route for forced tunnelling.
Related terms
- Customer edge router
For ExpressRoute, the router owned by you or your partner that forms BGP sessions with Microsoft's Enterprise Edge routers (MSEEs); BFD gets configured here.