BGP with BFD
Routing protocols have mechanism to detect link failures as well with
HELLO like mechanism but is not good enough for c
BFD runs independent of the routing protocol.
BFD had two modes of operation
Asynchronous Mode: The Asynchronous mode is like the Hello and Holddown timer , when BFD does not receive some of them the session is teared.
ECHO mode is on by default. ECHO packets are encapuslated un UDP .
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