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Add ISIS fast reroute documentation

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Adding basic descriptions of ISIS fast reroute documentation. Sadly it's sparse because FRR didn't really document it very deeply. But we'll get more as time goes on.
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Cheeze_It 2023-12-03 15:08:55 -07:00
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docs/configuration/protocols/isis.rst
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@ -302,6 +302,34 @@ Timers
control the timing of the execution of SPF calculations in response control the timing of the execution of SPF calculations in response
to IGP events. The process described in :rfc:`8405`. to IGP events. The process described in :rfc:`8405`.
Loop Free Alternate (LFA)
-------------------------
.. cfgcmd:: set protocols isis fast-reroute lfa remote prefix-list <name>
<level-1|level-2>
This command enables IP fast re-routing that is part of :rfc:`5286`.
Specifically this is a prefix list which references a prefix in which
will select eligible PQ nodes for remote LFA backups.
.. cfgcmd:: set protocols isis fast-reroute lfa local load-sharing disable
<level-1|level-2>
This command disables the load sharing across multiple LFA backups.
.. cfgcmd:: set protocols isis fast-reroute lfa local tiebreaker
<downstream|lowest-backup-metric|node-protecting> index <number>
<level-1|level-2>
This command will configure a tie-breaker for multiple local LFA backups.
The lower index numbers will be processed first.
.. cfgcmd:: set protocols isis fast-reroute lfa local priority-limit
<medium|high|critical> <level-1|level-2>
This command will limit LFA backup computation up to the specified
prefix priority.
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Examples Examples