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BFD: Added explanation on the purpose

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maehdros 2021-01-12 21:58:28 +01:00 committed by GitHub
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docs/configuration/protocols/bfd.rst
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@ -9,6 +9,12 @@ BFD
:abbr:`BFD (Bidirectional Forwarding Detection)` is described and extended by
the following RFCs: :rfc:`5880`, :rfc:`5881` and :rfc:`5883`.
In the age of very fast networks, a second of unreachability may equal millions of lost packets.
The idea behind BFD is to detect very quickly when a peer is down and take action extremely fast.
BFD sends lots of small UDP packets very quickly to ensures that the peer is still alive.
This allows avoiding the timers defined in BGP and OSPF protocol to expires.
Configure BFD
=============