commit 325fcfb6d83c9add415e24e786035b67b00fd719
author Daniel Walton <dwalton@cumulusnetworks.com> Tue May 19 17:58:10 2015 -0700
committer Paul Jakma <paul.jakma@hpe.com> Tue Sep 13 10:36:46 2016 +0100
tree f8608273e8b41d31888dd9112e978a5b0af21075
parent 76a7280ddebd94b20c545e93d9773e7ad4db91de

bgpd: Add clear command to force a bestpath recalculation and re-advertisement of a prefix

Add these commands to bgp:

clear ip bgp prefix A.B.C.D/M
clear bgp ipv6 (unicast|multicast) prefix X:X::X:X/M

These two commands forces a bestpath calculation to happen again if
necessary to re-advertise the prefix.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>

bgpd/bgp_route.c

diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 17b87f4..48645cf 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1602,7 +1602,8 @@
   new_select = old_and_new.new;
 
   /* Nothing to do. */
-  if (old_select && old_select == new_select)
+  if (old_select && old_select == new_select 
+      && !CHECK_FLAG(rn->flags, BGP_NODE_USER_CLEAR))
     {
       if (! CHECK_FLAG (old_select->flags, BGP_INFO_ATTR_CHANGED))
         {
@@ -1616,6 +1617,9 @@
         }
     }
 
+  /* If the user did "clear ip bgp prefix x.x.x.x" this flag will be set */
+  UNSET_FLAG(rn->flags, BGP_NODE_USER_CLEAR);
+
   if (old_select)
     bgp_info_unset_flag (rn, old_select, BGP_INFO_SELECTED);
   if (new_select)