add secondary-route feature for router server

if an export policy rejects a selected route, try the next route in
order until one that is accepted is found or all routes for the peer
are rejected.

the default is disabled. You can enable this feature in the following
way:

[neighbors.route-server.config]
  route-server-client = true
  secondary-route = true

Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/api/gobgp.proto b/api/gobgp.proto
index 5ae6bc8d..8586e80f 100644
--- a/api/gobgp.proto
+++ b/api/gobgp.proto
@@ -772,6 +772,7 @@ message Transport {
 
 message RouteServer {
   bool route_server_client = 1;
+  bool secondary_route = 2;
 }
 
 message GracefulRestart {