From 8196f13d2ab7f3b09150c00328228f90391acb7c Mon Sep 17 00:00:00 2001 From: Josh Bailey Date: Wed, 20 Jul 2011 20:47:07 -0700 Subject: bgpd: Modify the BGP to zebra route announcement to support multipath routes. Use a growable buffer (bgp_nexthop_buf) to collect nexthops that are included in the announcement. Use the BGP_INFO_MULTIPATH_CHG flag to trigger zebra announcement so zebra will be updated if the multipath set changes. Display all multipath nexthops in 'debug bgp zebra' output. * bgpd/bgp_main.c * bgp_exit(): Free bgp_nexthop_buf when exiting * bgpd/bgp_route.c * bgp_process_rsclient(): Clear BGP_INFO_MULTIPATH_CHG after processing * bgp_process_main(): Check BGP_INFO_MULTIPATH_CHG to trigger zebra announcement and clear aftr processing * bgpd/bgp_zebra.c * bgp_nexthop_buf: Growable buffer used to collect nexthops for zebra announcement * bgp_zebra_announce(): Grow bgp_nexthop_buf if needed. Include multipath count in zebra announcement and add all nexthops to bgp_nexthop_buf. Pass bgp_nexthop_buf data to zebra announcement. Added nexthops to debug output. * bgp_zebra_init(): Initialize bgp_nexthop_buf at startup * bgpd/bgp_zebra.h * BGP_NEXTHOP_BUF_SIZE: Default initial bgp_nexthop_buf size has room for 8 nexthops --- bgpd/bgp_route.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'bgpd/bgp_route.c') diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c index ec17dc61..f3e46221 100644 --- a/bgpd/bgp_route.c +++ b/bgpd/bgp_route.c @@ -1487,7 +1487,8 @@ bgp_process_rsclient (struct work_queue *wq, void *data) { bgp_info_set_flag (rn, new_select, BGP_INFO_SELECTED); bgp_info_unset_flag (rn, new_select, BGP_INFO_ATTR_CHANGED); - } + UNSET_FLAG (new_select->flags, BGP_INFO_MULTIPATH_CHG); + } bgp_process_announce_selected (rsclient, new_select, rn, afi, safi); @@ -1501,6 +1502,7 @@ bgp_process_rsclient (struct work_queue *wq, void *data) { bgp_info_set_flag (rn, new_select, BGP_INFO_SELECTED); bgp_info_unset_flag (rn, new_select, BGP_INFO_ATTR_CHANGED); + UNSET_FLAG (new_select->flags, BGP_INFO_MULTIPATH_CHG); } bgp_process_announce_selected (rsclient, new_select, rn, afi, safi); } @@ -1537,9 +1539,11 @@ bgp_process_main (struct work_queue *wq, void *data) { if (! CHECK_FLAG (old_select->flags, BGP_INFO_ATTR_CHANGED)) { - if (CHECK_FLAG (old_select->flags, BGP_INFO_IGP_CHANGED)) + if (CHECK_FLAG (old_select->flags, BGP_INFO_IGP_CHANGED) || + CHECK_FLAG (old_select->flags, BGP_INFO_MULTIPATH_CHG)) bgp_zebra_announce (p, old_select, bgp); + UNSET_FLAG (old_select->flags, BGP_INFO_MULTIPATH_CHG); UNSET_FLAG (rn->flags, BGP_NODE_PROCESS_SCHEDULED); return WQ_SUCCESS; } @@ -1551,6 +1555,7 @@ bgp_process_main (struct work_queue *wq, void *data) { bgp_info_set_flag (rn, new_select, BGP_INFO_SELECTED); bgp_info_unset_flag (rn, new_select, BGP_INFO_ATTR_CHANGED); + UNSET_FLAG (new_select->flags, BGP_INFO_MULTIPATH_CHG); } -- cgit v1.2.1