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Merge pull request #17924 from donaldsharp/evaluate_paths_optimization

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bgpd: Optimize evaluate paths for a peer going down
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Russ White 2025-01-28 11:29:15 -05:00 committed by GitHub
commit 219b00cb74
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1 changed files with 19 additions and 0 deletions
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19
bgpd/bgp_nht.c
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@ -1278,6 +1278,25 @@ void evaluate_paths(struct bgp_nexthop_cache *bnc)
}
LIST_FOREACH (path, &(bnc->paths), nh_thread) {
/*
* Currently when a peer goes down, bgp immediately
* sees this via the interface events( if it is directly
* connected). And in this case it takes and puts on
* a special peer queue all path info's associated with
* but these items are not yet processed typically when
* the nexthop is being handled here. Thus we end
* up in a situation where the process Queue for BGP
* is being asked to look at the same path info multiple
* times. Let's just cut to the chase here and if
* the bnc has a peer associated with it and the path info
* being looked at uses that peer and the peer is no
* longer established we know the path_info is being
* handled elsewhere and we do not need to process
* it here at all since the pathinfo is going away
*/
if (peer && path->peer == peer && !peer_established(peer->connection))
continue;
if (path->type == ZEBRA_ROUTE_BGP &&
(path->sub_type == BGP_ROUTE_NORMAL ||
path->sub_type == BGP_ROUTE_STATIC ||