From 16852e808e38f3f1cb4bcd8784748960702c6e66 Mon Sep 17 00:00:00 2001 From: maehdros Date: Tue, 12 Jan 2021 21:58:28 +0100 Subject: BFD: Added explanation on the purpose --- docs/configuration/protocols/bfd.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/docs/configuration/protocols/bfd.rst b/docs/configuration/protocols/bfd.rst index 4812f930..8d19334c 100644 --- a/docs/configuration/protocols/bfd.rst +++ b/docs/configuration/protocols/bfd.rst @@ -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 ============= -- cgit v1.2.3