diff --git a/Makefile b/Makefile
index e066a25..9b140ce 100755
--- a/Makefile
+++ b/Makefile
@@ -55,7 +55,7 @@ clean: ## clean cache
 ## prepare environment
 update:
 	git submodule init
-	git submodule update
+	git submodule update --remote
 
 vendor:
 	go clean -modcache
diff --git a/pkg/config/switch.go b/pkg/config/switch.go
index 9caeee3..17706ac 100755
--- a/pkg/config/switch.go
+++ b/pkg/config/switch.go
@@ -153,12 +153,13 @@ func (s *Switch) Format() {
 	for _, obj := range s.Network {
 		context := obj.Specifies
 		obj.NewSpecifies()
-		if data, err := libol.Marshal(context, true); err == nil {
-			if err := libol.Unmarshal(obj.Specifies, data); err != nil {
-				libol.Warn("Switch.Format %s", err)
-			} else {
-				libol.Info("Switch.Format %v", obj.Specifies)
-			}
+		if obj.Specifies == nil {
+			continue
+		}
+		if data, err := libol.Marshal(context, true); err != nil {
+			libol.Warn("Switch.Format %s", err)
+		} else if err := libol.Unmarshal(obj.Specifies, data); err != nil {
+			libol.Warn("Switch.Format %s", err)
 		}
 	}
 }
diff --git a/pkg/switch/openlan.go b/pkg/switch/openlan.go
index e5c6141..99770dc 100755
--- a/pkg/switch/openlan.go
+++ b/pkg/switch/openlan.go
@@ -39,7 +39,7 @@ func NewOpenLANWorker(c *co.Network) *OpenLANWorker {
 }
 
 func (w *OpenLANWorker) updateVPN() {
-	cfg, vpn := w.GetCfgs()
+	_, vpn := w.GetCfgs()
 	if vpn == nil {
 		return
 	}
@@ -47,7 +47,7 @@ func (w *OpenLANWorker) updateVPN() {
 	routes := vpn.Routes
 	routes = append(routes, vpn.Subnet)
 	if addr := w.Subnet(); addr != "" {
-		libol.Info("OpenLANWorker.updateVPN %s subnet %s", cfg.Name, addr)
+		w.out.Info("OpenLANWorker.updateVPN subnet %s", addr)
 		routes = append(routes, addr)
 	}
 
diff --git a/pkg/switch/router.go b/pkg/switch/router.go
index 26e8235..5b7add4 100755
--- a/pkg/switch/router.go
+++ b/pkg/switch/router.go
@@ -33,6 +33,7 @@ func (w *RouterWorker) updateVPN() {
 	routes := vpn.Routes
 	routes = append(routes, vpn.Subnet)
 	for _, sub := range spec.Subnets {
+		w.out.Info("RouterWorker.updateVPN subnet %s", sub.CIDR)
 		routes = append(routes, sub.CIDR)
 	}