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