![]() ![]() BFD was specifically built for fast/low CPU detection, and in the case of single-hop, can offload a great deal of the checks to CEF (by using echo mode - more later), even on a typical router. Tuning the timers can theoretically get you sub-second failure detection in some protocols, but this produces unnecessary high overhead as the average IGP wasn't designed with that in mind. All routing protocols have some way of detecting failure, usually timer-related. It can detect link failures in milliseconds, with the potential for microseconds on the right platform. to use BFD for link failure detection instead of their own mechanisms.īFD is a high-speed "are you up" protocol that other routing protocols subscribe to. Once it’s up and running, you can configure protocols like OSPF, EIGRP, BGP, HSRP, MPLS LDP etc. Routing protocols like OSPF or EIGRP are able to quickly select another path once they lose a neighbor but it takes a while for them to realize that something is wrong.īFD runs independent from any other (routing) protocols. ![]() Networks that use real-time traffic like VoIP require fast convergence times. OSPF uses hello packets and a dead interval, EIGRP uses hello packets and a holddown timer etc. All (routing) protocols have some sort of mechanism to detect link failures. BFD (Bidirectional Forwarding Detection) is a super fast protocol that is able to detect link failures within milliseconds or even microseconds. ![]()
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