From f691f2ebbdeb77cb6a9daacb62f2f57ec5ce8414 Mon Sep 17 00:00:00 2001 From: Renato Westphal Date: Thu, 25 Feb 2021 14:40:34 -0300 Subject: [PATCH] doc: improve documentation of the IS-IS fast reroute commands * Clarify which commands are applicable to which flavors of LFA; * Explain the default prefix priority for different prefix types; * Rearrange some command descriptions so that they appear in this order: local LFA, remote LFA and then TI-LFA. Signed-off-by: Renato Westphal --- doc/user/isisd.rst | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/doc/user/isisd.rst b/doc/user/isisd.rst index 457f841118..ebcf21b04c 100644 --- a/doc/user/isisd.rst +++ b/doc/user/isisd.rst @@ -121,17 +121,23 @@ ISIS Timer ISIS Fast-Reroute ================= +Unless stated otherwise, commands in this section apply to all LFA +flavors (local LFA, Remote LFA and TI-LFA). + .. clicmd:: spf prefix-priority [critical | high | medium] WORD Assign a priority to the prefixes that match the specified access-list. + By default loopback prefixes have medium priority and non-loopback prefixes + have low priority. + .. clicmd:: fast-reroute priority-limit [critical | high | medium] [level-1 | level-2] Limit LFA backup computation up to the specified prefix priority. .. clicmd:: fast-reroute lfa tiebreaker [downstream | lowest-backup-metric | node-protecting] index (1-255) [level-1 | level-2] - Configure a tie-breaker for multiple LFA backups. Lower indexes are + Configure a tie-breaker for multiple local LFA backups. Lower indexes are processed first. .. clicmd:: fast-reroute load-sharing disable [level-1 | level-2] @@ -140,8 +146,8 @@ ISIS Fast-Reroute .. clicmd:: fast-reroute remote-lfa prefix-list [WORD] [level-1 | level-2] - Configure a prefix-list to select eligible PQ nodes (valid for all protected - interfaces). + Configure a prefix-list to select eligible PQ nodes for remote LFA + backups (valid for all protected interfaces). .. _isis-region: @@ -239,15 +245,11 @@ ISIS interface .. clicmd:: isis fast-reroute lfa [level-1 | level-2] - Enable per-prefix LFA fast reroute link protection. + Enable per-prefix local LFA fast reroute link protection. .. clicmd:: isis fast-reroute lfa [level-1 | level-2] exclude interface IFNAME - Exclude an interface from the LFA backup nexthop computation. - -.. clicmd:: isis fast-reroute ti-lfa [level-1|level-2] [node-protection] - - Enable per-prefix TI-LFA fast reroute link or node protection. + Exclude an interface from the local LFA backup nexthop computation. .. clicmd:: isis fast-reroute remote-lfa tunnel mpls-ldp [level-1 | level-2] @@ -259,6 +261,10 @@ ISIS interface Limit Remote LFA PQ node selection within the specified metric. +.. clicmd:: isis fast-reroute ti-lfa [level-1|level-2] [node-protection] + + Enable per-prefix TI-LFA fast reroute link or node protection. + .. _showing-isis-information: