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BFD: Update documentation about per-session options

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Ondrej Zajicek (work) 2020-11-12 04:50:45 +01:00
parent 3b56bf8849
commit 4a42e7e925
1 changed files with 7 additions and 2 deletions
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doc/bird.sgml
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@ -1943,6 +1943,8 @@ configuration is often sufficient.
<p>Note that to use BFD for other protocols like OSPF or BGP, these protocols <p>Note that to use BFD for other protocols like OSPF or BGP, these protocols
also have to be configured to request BFD sessions, usually by <cf/bfd/ option. also have to be configured to request BFD sessions, usually by <cf/bfd/ option.
In BGP case, it is also possible to specify per-peer BFD session options (e.g.
rx/tx intervals) as a part of the <cf/bfd/ option.
<p>A BFD instance not associated with any VRF handles session requests from all <p>A BFD instance not associated with any VRF handles session requests from all
other protocols, even ones associated with a VRF. Such setup would work for other protocols, even ones associated with a VRF. Such setup would work for
@ -2315,14 +2317,17 @@ using the following configuration parameters:
immediately shut down. Note that this option cannot be used with immediately shut down. Note that this option cannot be used with
multihop BGP. Default: enabled for direct BGP, disabled otherwise. multihop BGP. Default: enabled for direct BGP, disabled otherwise.
<tag><label id="bgp-bfd">bfd <M>switch</M>|graceful</tag> <tag><label id="bgp-bfd">bfd <M>switch</M>|graceful| { <m/options/ }</tag>
BGP could use BFD protocol as an advisory mechanism for neighbor BGP could use BFD protocol as an advisory mechanism for neighbor
liveness and failure detection. If enabled, BIRD setups a BFD session liveness and failure detection. If enabled, BIRD setups a BFD session
for the BGP neighbor and tracks its liveness by it. This has an for the BGP neighbor and tracks its liveness by it. This has an
advantage of an order of magnitude lower detection times in case of advantage of an order of magnitude lower detection times in case of
failure. When a neighbor failure is detected, the BGP session is failure. When a neighbor failure is detected, the BGP session is
restarted. Optionally, it can be configured (by <cf/graceful/ argument) restarted. Optionally, it can be configured (by <cf/graceful/ argument)
to trigger graceful restart instead of regular restart. Note that BFD to trigger graceful restart instead of regular restart. It is also
possible to specify section with per-peer BFD session options instead of
just switch argument. Most BFD session specific options are allowed here
with the exception of authentication options. here Note that BFD
protocol also has to be configured, see <ref id="bfd" name="BFD"> protocol also has to be configured, see <ref id="bfd" name="BFD">
section for details. Default: disabled. section for details. Default: disabled.