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, 6 insertions, 0 deletions

diff --git a/pkg/server/peer.go b/pkg/server/peer.go
index d7fb46c3..910c7472 100644
--- a/pkg/server/peer.go
+++ b/pkg/server/peer.go
@@ -147,6 +147,12 @@ func (peer *peer) isRouteServerClient() bool {
 	return peer.fsm.pConf.RouteServer.Config.RouteServerClient
 }
 
+func (peer *peer) isSecondaryRouteEnabled() bool {
+	peer.fsm.lock.RLock()
+	defer peer.fsm.lock.RUnlock()
+	return peer.fsm.pConf.RouteServer.Config.RouteServerClient && peer.fsm.pConf.RouteServer.Config.SecondaryRoute
+}
+
 func (peer *peer) isRouteReflectorClient() bool {
 	peer.fsm.lock.RLock()
 	defer peer.fsm.lock.RUnlock()