server: support graceful-restart helper-speaker behavior

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>

9 files changed, 434 insertions, 280 deletions

diff --git a/api/gobgp.pb.go b/api/gobgp.pb.go
index 8a12b76a..b4e3eb27 100644
--- a/api/gobgp.pb.go
+++ b/api/gobgp.pb.go
@@ -683,6 +683,7 @@ type Path struct {
 	SourceAsn          uint32   `protobuf:"varint,9,opt,name=source_asn" json:"source_asn,omitempty"`
 	SourceId           string   `protobuf:"bytes,10,opt,name=source_id" json:"source_id,omitempty"`
 	Filtered           bool     `protobuf:"varint,11,opt,name=filtered" json:"filtered,omitempty"`
+	Stale              bool     `protobuf:"varint,12,opt,name=stale" json:"stale,omitempty"`
 }
 
 func (m *Path) Reset()                    { *m = Path{} }
@@ -2984,224 +2985,225 @@ var _GobgpApi_serviceDesc = grpc.ServiceDesc{
 }
 
 var fileDescriptor0 = []byte{
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+	0x84, 0xca, 0x57, 0x8b, 0x4b, 0xe7, 0xf0, 0x3c, 0xf7, 0xc2, 0x21, 0xd5, 0xa2, 0x6f, 0x0c, 0x84,
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+	0xbf, 0x84, 0x17, 0xbd, 0xa1, 0x4f, 0xf6, 0xe4, 0x35, 0x0a, 0x66, 0xea, 0x2f, 0x5f, 0xa5, 0x25,
+	0x02, 0x62, 0x19, 0xbf, 0x60, 0x27, 0x63, 0x9c, 0xb8, 0x93, 0xc5, 0x6e, 0xee, 0xcf, 0x89, 0x01,
+	0xe2, 0x86, 0xfd, 0x67, 0x22, 0xb3, 0xa5, 0x8e, 0x88, 0x78, 0x7d, 0xc2, 0xf2, 0x61, 0x1b, 0xe2,
+	0xbd, 0x12, 0x85, 0xee, 0xe3, 0x43, 0x15, 0x52, 0xe7, 0x12, 0x57, 0x45, 0xf4, 0xf2, 0x3f, 0x49,
+	0xb8, 0xff, 0x86, 0x0a, 0xb2, 0x8a, 0x1c, 0x34, 0x25, 0xde, 0xc6, 0xd7, 0x93, 0xef, 0xe8, 0x29,
+	0xb1, 0xae, 0xc7, 0xd0, 0xbd, 0xcb, 0xe1, 0xb3, 0xf7, 0x55, 0x62, 0x1f, 0x13, 0x28, 0x37, 0x62,
+	0xf2, 0x27, 0x7c, 0x65, 0x90, 0xb4, 0x8d, 0x2f, 0xb9, 0x9e, 0x84, 0x33, 0x74, 0xd2, 0xec, 0x5a,
+	0x4f, 0x1c, 0x68, 0x03, 0x15, 0x2c, 0x56, 0xbc, 0xcb, 0x20, 0xe3, 0x06, 0x76, 0xa1, 0x1c, 0xfd,
+	0x50, 0x41, 0x79, 0x37, 0x26, 0xff, 0xea, 0x07, 0x0c, 0xc9, 0x49, 0xaf, 0x88, 0x22, 0xc8, 0x89,
+	0x76, 0x65, 0xc6, 0xad, 0xaf, 0xac, 0x88, 0xe4, 0x1f, 0xa0, 0xe0, 0x78, 0x7c, 0x31, 0x24, 0x94,
+	0xf6, 0x6b, 0xec, 0xa3, 0x82, 0x8f, 0x09, 0x94, 0xb7, 0xe2, 0x89, 0x2e, 0xfe, 0x05, 0x44, 0x92,
+	0x9c, 0x1d, 0xd8, 0x5a, 0xc8, 0x19, 0x99, 0xff, 0x5f, 0x72, 0x21, 0x58, 0x7f, 0xd9, 0x65, 0xe1,
+	0x15, 0xa5, 0x0b, 0x5b, 0x09, 0xdf, 0x36, 0x28, 0x37, 0x93, 0x04, 0x5b, 0xfd, 0xf4, 0x21, 0x41,
+	0xc4, 0x93, 0x3c, 0x7f, 0x1c, 0xf7, 0xe9, 0x3f, 0x03, 0x00, 0x00, 0xff, 0xff, 0x5c, 0xe1, 0xbf,
+	0x08, 0x2b, 0x27, 0x00, 0x00,
 }
diff --git a/api/gobgp.proto b/api/gobgp.proto
index 5bdc9046..11f969e0 100644
--- a/api/gobgp.proto
+++ b/api/gobgp.proto
@@ -197,6 +197,7 @@ message Path {
     uint32 source_asn = 9;
     string source_id = 10;
     bool filtered = 11;
+    bool stale = 12;
 }
 
 message Destination {
diff --git a/gobgp/cmd/common.go b/gobgp/cmd/common.go
index 44de301e..e039c5ff 100644
--- a/gobgp/cmd/common.go
+++ b/gobgp/cmd/common.go
@@ -164,6 +164,7 @@ type Path struct {
 	Validation int32                        `json:"validation"`
 	Filtered   bool                         `json:"filtered"`
 	SourceId   string                       `json:"source-id"`
+	Stale      bool                         `json:"stale"`
 }
 
 func ApiStruct2Path(p *gobgpapi.Path) ([]*Path, error) {
@@ -211,6 +212,7 @@ func ApiStruct2Path(p *gobgpapi.Path) ([]*Path, error) {
 			Validation: p.Validation,
 			SourceId:   p.SourceId,
 			Filtered:   p.Filtered,
+			Stale:      p.Stale,
 		})
 	}
 	return paths, nil
diff --git a/gobgp/cmd/neighbor.go b/gobgp/cmd/neighbor.go
index 8f820b0c..3a9afd02 100644
--- a/gobgp/cmd/neighbor.go
+++ b/gobgp/cmd/neighbor.go
@@ -285,6 +285,9 @@ func ShowRoute(pathList []*Path, showAge, showBest, showLabel, isMonitor, printH
 		}
 
 		best := ""
+		if p.Stale {
+			best += "S"
+		}
 		switch int(p.Validation) {
 		case config.RPKI_VALIDATION_RESULT_TYPE_NOT_FOUND.ToInt():
 			best += "N"
diff --git a/server/fsm.go b/server/fsm.go
index aa0d7d4e..8a8748a5 100644
--- a/server/fsm.go
+++ b/server/fsm.go
@@ -116,24 +116,25 @@ func (s AdminState) String() string {
 }
 
 type FSM struct {
-	t                tomb.Tomb
-	gConf            *config.Global
-	pConf            *config.Neighbor
-	state            bgp.FSMState
-	reason           FsmStateReason
-	conn             net.Conn
-	connCh           chan net.Conn
-	idleHoldTime     float64
-	opensentHoldTime float64
-	adminState       AdminState
-	adminStateCh     chan AdminState
-	getActiveCh      chan struct{}
-	h                *FSMHandler
-	rfMap            map[bgp.RouteFamily]bool
-	capMap           map[bgp.BGPCapabilityCode][]bgp.ParameterCapabilityInterface
-	recvOpen         *bgp.BGPMessage
-	peerInfo         *table.PeerInfo
-	policy           *table.RoutingPolicy
+	t                    tomb.Tomb
+	gConf                *config.Global
+	pConf                *config.Neighbor
+	state                bgp.FSMState
+	reason               FsmStateReason
+	conn                 net.Conn
+	connCh               chan net.Conn
+	idleHoldTime         float64
+	opensentHoldTime     float64
+	adminState           AdminState
+	adminStateCh         chan AdminState
+	getActiveCh          chan struct{}
+	h                    *FSMHandler
+	rfMap                map[bgp.RouteFamily]bool
+	capMap               map[bgp.BGPCapabilityCode][]bgp.ParameterCapabilityInterface
+	recvOpen             *bgp.BGPMessage
+	peerInfo             *table.PeerInfo
+	policy               *table.RoutingPolicy
+	gracefulRestartTimer *time.Timer
 }
 
 func (fsm *FSM) bgpMessageStateUpdate(MessageType uint8, isIn bool) {
@@ -191,19 +192,21 @@ func NewFSM(gConf *config.Global, pConf *config.Neighbor, policy *table.RoutingP
 		adminState = ADMIN_STATE_DOWN
 	}
 	fsm := &FSM{
-		gConf:            gConf,
-		pConf:            pConf,
-		state:            bgp.BGP_FSM_IDLE,
-		connCh:           make(chan net.Conn, 1),
-		opensentHoldTime: float64(HOLDTIME_OPENSENT),
-		adminState:       adminState,
-		adminStateCh:     make(chan AdminState, 1),
-		getActiveCh:      make(chan struct{}),
-		rfMap:            make(map[bgp.RouteFamily]bool),
-		capMap:           make(map[bgp.BGPCapabilityCode][]bgp.ParameterCapabilityInterface),
-		peerInfo:         table.NewPeerInfo(gConf, pConf),
-		policy:           policy,
+		gConf:                gConf,
+		pConf:                pConf,
+		state:                bgp.BGP_FSM_IDLE,
+		connCh:               make(chan net.Conn, 1),
+		opensentHoldTime:     float64(HOLDTIME_OPENSENT),
+		adminState:           adminState,
+		adminStateCh:         make(chan AdminState, 1),
+		getActiveCh:          make(chan struct{}),
+		rfMap:                make(map[bgp.RouteFamily]bool),
+		capMap:               make(map[bgp.BGPCapabilityCode][]bgp.ParameterCapabilityInterface),
+		peerInfo:             table.NewPeerInfo(gConf, pConf),
+		policy:               policy,
+		gracefulRestartTimer: time.NewTimer(time.Hour),
 	}
+	fsm.gracefulRestartTimer.Stop()
 	fsm.t.Go(fsm.connectLoop)
 	return fsm
 }
@@ -285,7 +288,7 @@ func (fsm *FSM) connectLoop() error {
 	ticker.Stop()
 
 	connect := func() {
-		if fsm.state == bgp.BGP_FSM_ACTIVE {
+		if fsm.state == bgp.BGP_FSM_ACTIVE && !fsm.pConf.GracefulRestart.State.PeerRestarting {
 			addr := fsm.pConf.Config.NeighborAddress
 			host := net.JoinHostPort(addr, strconv.Itoa(bgp.BGP_PORT))
 			// check if LocalAddress has been configured
@@ -376,6 +379,15 @@ func (h *FSMHandler) idle() (bgp.FSMState, FsmStateReason) {
 		select {
 		case <-h.t.Dying():
 			return -1, FSM_DYING
+		case <-fsm.gracefulRestartTimer.C:
+			if fsm.pConf.GracefulRestart.State.PeerRestarting {
+				log.WithFields(log.Fields{
+					"Topic": "Peer",
+					"Key":   fsm.pConf.Config.NeighborAddress,
+					"State": fsm.state,
+				}).Warn("graceful restart timer expired")
+				return bgp.BGP_FSM_IDLE, FSM_RESTART_TIMER_EXPIRED
+			}
 		case conn, ok := <-fsm.connCh:
 			if !ok {
 				break
@@ -440,6 +452,15 @@ func (h *FSMHandler) active() (bgp.FSMState, FsmStateReason) {
 			// we don't implement delayed open timer so move to opensent right
 			// away.
 			return bgp.BGP_FSM_OPENSENT, 0
+		case <-fsm.gracefulRestartTimer.C:
+			if fsm.pConf.GracefulRestart.State.PeerRestarting {
+				log.WithFields(log.Fields{
+					"Topic": "Peer",
+					"Key":   fsm.pConf.Config.NeighborAddress,
+					"State": fsm.state,
+				}).Warn("graceful restart timer expired")
+				return bgp.BGP_FSM_IDLE, FSM_RESTART_TIMER_EXPIRED
+			}
 		case err := <-h.errorCh:
 			return bgp.BGP_FSM_IDLE, err
 		case s := <-fsm.adminStateCh:
@@ -708,6 +729,15 @@ func (h *FSMHandler) opensent() (bgp.FSMState, FsmStateReason) {
 				"Key":   fsm.pConf.Config.NeighborAddress,
 				"State": fsm.state,
 			}).Warn("Closed an accepted connection")
+		case <-fsm.gracefulRestartTimer.C:
+			if fsm.pConf.GracefulRestart.State.PeerRestarting {
+				log.WithFields(log.Fields{
+					"Topic": "Peer",
+					"Key":   fsm.pConf.Config.NeighborAddress,
+					"State": fsm.state,
+				}).Warn("graceful restart timer expired")
+				return bgp.BGP_FSM_IDLE, FSM_RESTART_TIMER_EXPIRED
+			}
 		case e := <-h.msgCh:
 			switch e.MsgData.(type) {
 			case *bgp.BGPMessage:
@@ -868,6 +898,15 @@ func (h *FSMHandler) openconfirm() (bgp.FSMState, FsmStateReason) {
 				"Key":   fsm.pConf.Config.NeighborAddress,
 				"State": fsm.state,
 			}).Warn("Closed an accepted connection")
+		case <-fsm.gracefulRestartTimer.C:
+			if fsm.pConf.GracefulRestart.State.PeerRestarting {
+				log.WithFields(log.Fields{
+					"Topic": "Peer",
+					"Key":   fsm.pConf.Config.NeighborAddress,
+					"State": fsm.state,
+				}).Warn("graceful restart timer expired")
+				return bgp.BGP_FSM_IDLE, FSM_RESTART_TIMER_EXPIRED
+			}
 		case <-ticker.C:
 			m := bgp.NewBGPKeepAliveMessage()
 			b, _ := m.Serialize()
@@ -1031,6 +1070,8 @@ func (h *FSMHandler) established() (bgp.FSMState, FsmStateReason) {
 		holdTimer = time.NewTimer(time.Second * time.Duration(fsm.pConf.Timers.State.NegotiatedHoldTime))
 	}
 
+	fsm.gracefulRestartTimer.Stop()
+
 	for {
 		select {
 		case <-h.t.Dying():
@@ -1048,6 +1089,15 @@ func (h *FSMHandler) established() (bgp.FSMState, FsmStateReason) {
 		case err := <-h.errorCh:
 			h.conn.Close()
 			h.t.Kill(nil)
+			if s := fsm.pConf.GracefulRestart.State; s.Enabled && (err == FSM_READ_FAILED || err == FSM_WRITE_FAILED) {
+				err = FSM_GRACEFUL_RESTART
+				log.WithFields(log.Fields{
+					"Topic": "Peer",
+					"Key":   fsm.pConf.Config.NeighborAddress,
+					"State": fsm.state,
+				}).Info("peer graceful restart")
+				fsm.gracefulRestartTimer.Reset(time.Duration(fsm.pConf.GracefulRestart.State.PeerRestartTime) * time.Second)
+			}
 			return bgp.BGP_FSM_IDLE, err
 		case <-holdTimer.C:
 			log.WithFields(log.Fields{
diff --git a/server/peer.go b/server/peer.go
index da76bf93..ee9c8bdd 100644
--- a/server/peer.go
+++ b/server/peer.go
@@ -97,11 +97,45 @@ func (peer *Peer) isGracefulRestartEnabled() bool {
 	return peer.fsm.pConf.GracefulRestart.State.Enabled
 }
 
+func (peer *Peer) recvedAllEOR() bool {
+	for _, a := range peer.fsm.pConf.AfiSafis {
+		if s := a.MpGracefulRestart.State; s.Enabled && !s.EndOfRibReceived {
+			return false
+		}
+	}
+	return true
+}
+
 func (peer *Peer) configuredRFlist() []bgp.RouteFamily {
 	rfs, _ := config.AfiSafis(peer.conf.AfiSafis).ToRfList()
 	return rfs
 }
 
+func (peer *Peer) forwardingPreservedFamilies() ([]bgp.RouteFamily, []bgp.RouteFamily) {
+	list := []bgp.RouteFamily{}
+	for _, a := range peer.fsm.pConf.AfiSafis {
+		if s := a.MpGracefulRestart.State; s.Enabled && s.Received {
+			f, _ := bgp.GetRouteFamily(string(a.AfiSafiName))
+			list = append(list, f)
+		}
+	}
+	preserved := []bgp.RouteFamily{}
+	notPreserved := []bgp.RouteFamily{}
+	for _, f := range peer.configuredRFlist() {
+		p := true
+		for _, g := range list {
+			if f == g {
+				p = false
+				preserved = append(preserved, f)
+			}
+		}
+		if p {
+			notPreserved = append(notPreserved, f)
+		}
+	}
+	return preserved, notPreserved
+}
+
 func (peer *Peer) getAccepted(rfList []bgp.RouteFamily) []*table.Path {
 	return peer.adjRibIn.PathList(rfList, true)
 }
@@ -206,6 +240,10 @@ func (peer *Peer) startFSMHandler(incoming, stateCh chan *FsmMsg) {
 	peer.fsm.h = NewFSMHandler(peer.fsm, incoming, stateCh, peer.outgoing)
 }
 
+func (peer *Peer) StaleAll(rfList []bgp.RouteFamily) {
+	peer.adjRibIn.StaleAll(rfList)
+}
+
 func (peer *Peer) PassConn(conn *net.TCPConn) {
 	select {
 	case peer.fsm.connCh <- conn:
diff --git a/server/server.go b/server/server.go
index a833fa7f..f9976624 100644
--- a/server/server.go
+++ b/server/server.go
@@ -452,7 +452,7 @@ func (server *BgpServer) Serve() {
 					t.Stop()
 				}(addr)
 
-				m := server.dropPeerAllRoutes(peer)
+				m := server.dropPeerAllRoutes(peer, peer.configuredRFlist())
 				if len(m) > 0 {
 					senderMsgs = append(senderMsgs, m...)
 				}
@@ -580,11 +580,11 @@ func filterpath(peer *Peer, path *table.Path) *table.Path {
 	return path
 }
 
-func (server *BgpServer) dropPeerAllRoutes(peer *Peer) []*SenderMsg {
+func (server *BgpServer) dropPeerAllRoutes(peer *Peer, families []bgp.RouteFamily) []*SenderMsg {
 	msgs := make([]*SenderMsg, 0)
 
 	options := &table.PolicyOptions{}
-	for _, rf := range peer.configuredRFlist() {
+	for _, rf := range families {
 		dsts := server.globalRib.DeletePathsByPeer(peer.fsm.peerInfo, rf)
 		server.validatePaths(dsts, true)
 		if peer.isRouteServerClient() {
@@ -957,10 +957,26 @@ func (server *BgpServer) handleFSMMessage(peer *Peer, e *FsmMsg) []*SenderMsg {
 			if t.Sub(time.Unix(peer.conf.Timers.State.Uptime, 0)) < FLOP_THRESHOLD {
 				peer.conf.State.Flops++
 			}
-
+			var drop []bgp.RouteFamily
+			if peer.fsm.reason == FSM_GRACEFUL_RESTART {
+				peer.fsm.pConf.GracefulRestart.State.PeerRestarting = true
+				var p []bgp.RouteFamily
+				p, drop = peer.forwardingPreservedFamilies()
+				peer.StaleAll(p)
+			} else {
+				drop = peer.configuredRFlist()
+			}
+			peer.DropAll(drop)
+			msgs = append(msgs, server.dropPeerAllRoutes(peer, drop)...)
+		} else if peer.fsm.pConf.GracefulRestart.State.PeerRestarting && nextState == bgp.BGP_FSM_IDLE {
+			// RFC 4724 4.2
+			// If the session does not get re-established within the "Restart Time"
+			// that the peer advertised previously, the Receiving Speaker MUST
+			// delete all the stale routes from the peer that it is retaining.
+			peer.fsm.pConf.GracefulRestart.State.PeerRestarting = false
 			peer.DropAll(peer.configuredRFlist())
 
-			msgs = append(msgs, server.dropPeerAllRoutes(peer)...)
+			msgs = append(msgs, server.dropPeerAllRoutes(peer, peer.configuredRFlist())...)
 		}
 
 		close(peer.outgoing)
@@ -1072,6 +1088,14 @@ func (server *BgpServer) handleFSMMessage(peer *Peer, e *FsmMsg) []*SenderMsg {
 			}
 
 			if len(eor) > 0 {
+				for _, f := range eor {
+					for i, a := range peer.fsm.pConf.AfiSafis {
+						if g, _ := bgp.GetRouteFamily(string(a.AfiSafiName)); f == g {
+							peer.fsm.pConf.AfiSafis[i].MpGracefulRestart.State.EndOfRibReceived = true
+						}
+					}
+				}
+
 				// RFC 4724 4.1
 				// Once the session between the Restarting Speaker and the Receiving
 				// Speaker is re-established, ...snip... it MUST defer route
@@ -1080,33 +1104,17 @@ func (server *BgpServer) handleFSMMessage(peer *Peer, e *FsmMsg) []*SenderMsg {
 				// "Restart State" bit set in the received capability and excluding the
 				// ones that do not advertise the graceful restart capability) or ...snip...
 				if peer.fsm.pConf.GracefulRestart.State.LocalRestarting {
-					var end bool
-					for _, f := range eor {
-						end = true
-						for i, a := range peer.fsm.pConf.AfiSafis {
-							if g, _ := bgp.GetRouteFamily(string(a.AfiSafiName)); f == g {
-								peer.fsm.pConf.AfiSafis[i].MpGracefulRestart.State.EndOfRibReceived = true
-							}
-							if s := a.MpGracefulRestart.State; s.Enabled && !s.EndOfRibReceived {
-								end = false
+					allEnd := func() bool {
+						for _, p := range server.neighborMap {
+							if !p.recvedAllEOR() {
+								return false
 							}
 						}
-					}
-					if end {
-						log.WithFields(log.Fields{
-							"Topic": "Peer",
-							"Key":   peer.conf.Config.NeighborAddress,
-						}).Debug("all family's EOR received")
-						peer.fsm.pConf.GracefulRestart.State.LocalRestarting = false
-					}
-					allEnd := true
-					for _, p := range server.neighborMap {
-						if p.fsm.pConf.GracefulRestart.State.LocalRestarting {
-							allEnd = false
-						}
-					}
+						return true
+					}()
 					if allEnd {
 						for _, p := range server.neighborMap {
+							p.fsm.pConf.GracefulRestart.State.LocalRestarting = false
 							if !p.isGracefulRestartEnabled() {
 								continue
 							}
@@ -1121,6 +1129,18 @@ func (server *BgpServer) handleFSMMessage(peer *Peer, e *FsmMsg) []*SenderMsg {
 						}).Info("sync finished")
 					}
 				}
+				if peer.fsm.pConf.GracefulRestart.State.PeerRestarting {
+					if peer.recvedAllEOR() {
+						peer.fsm.pConf.GracefulRestart.State.PeerRestarting = false
+						pathList := peer.adjRibIn.DropStale(peer.configuredRFlist())
+						log.WithFields(log.Fields{
+							"Topic": "Peer",
+							"Key":   peer.conf.Config.NeighborAddress,
+						}).Debugf("withdraw %d stale routes", len(pathList))
+						m, _ := server.propagateUpdate(peer, pathList)
+						msgs = append(msgs, m...)
+					}
+				}
 			}
 		default:
 			log.WithFields(log.Fields{
@@ -2381,7 +2401,7 @@ func (server *BgpServer) handleGrpcModNeighbor(grpcReq *GrpcRequest) (sMsgs []*S
 			n.fsm.t.Wait()
 			t.Stop()
 		}(addr)
-		m := server.dropPeerAllRoutes(n)
+		m := server.dropPeerAllRoutes(n, n.configuredRFlist())
 		if len(m) > 0 {
 			sMsgs = append(sMsgs, m...)
 		}
diff --git a/table/adj.go b/table/adj.go
index 77660fab..411f74f0 100644
--- a/table/adj.go
+++ b/table/adj.go
@@ -133,3 +133,31 @@ func (adj *AdjRib) Drop(rfList []bgp.RouteFamily) {
 		}
 	}
 }
+
+func (adj *AdjRib) DropStale(rfList []bgp.RouteFamily) []*Path {
+	pathList := make([]*Path, 0, adj.Count(rfList))
+	for _, rf := range rfList {
+		if table, ok := adj.table[rf]; ok {
+			for _, p := range table {
+				if p.IsStale() {
+					delete(table, p.getPrefix())
+					if p.Filtered(adj.id) == POLICY_DIRECTION_NONE {
+						adj.accepted[rf]--
+					}
+					pathList = append(pathList, p.Clone(true))
+				}
+			}
+		}
+	}
+	return pathList
+}
+
+func (adj *AdjRib) StaleAll(rfList []bgp.RouteFamily) {
+	for _, rf := range rfList {
+		if table, ok := adj.table[rf]; ok {
+			for _, p := range table {
+				p.MarkStale(true)
+			}
+		}
+	}
+}
diff --git a/table/path.go b/table/path.go
index bb3eb7a3..87ba4212 100644
--- a/table/path.go
+++ b/table/path.go
@@ -55,6 +55,7 @@ type originInfo struct {
 	key                string
 	uuid               []byte
 	eor                bool
+	stale              bool
 }
 
 type Path struct {
@@ -237,6 +238,7 @@ func (path *Path) ToApiStruct(id string) *api.Path {
 		Family:     family,
 		SourceAsn:  path.OriginInfo().source.AS,
 		SourceId:   path.OriginInfo().source.ID.String(),
+		Stale:      path.IsStale(),
 	}
 }
 
@@ -308,6 +310,14 @@ func (path *Path) GetSource() *PeerInfo {
 	return path.OriginInfo().source
 }
 
+func (path *Path) MarkStale(s bool) {
+	path.OriginInfo().stale = s
+}
+
+func (path *Path) IsStale() bool {
+	return path.OriginInfo().stale
+}
+
 func (path *Path) GetSourceAs() uint32 {
 	attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
 	if attr != nil {