diff --git a/dist/rootfs/etc/openlan/switch/network/v1024.json.example b/dist/rootfs/etc/openlan/switch/network/v1024.json.example
index 8acf275..f2e4646 100755
--- a/dist/rootfs/etc/openlan/switch/network/v1024.json.example
+++ b/dist/rootfs/etc/openlan/switch/network/v1024.json.example
@@ -20,7 +20,7 @@
         },
         {
             "vlan": 0,
-            "interface": "gre:3.3.3.3"
+            "interface": "gre:3.3.3.3:55"
         }
     ]
 }
diff --git a/pkg/switch/network.go b/pkg/switch/network.go
index a1236d3..fe760c8 100755
--- a/pkg/switch/network.go
+++ b/pkg/switch/network.go
@@ -159,7 +159,10 @@ func (w *WorkerImpl) AddOutput(bridge string, port *LinuxPort) {
 		if port.link == "" {
 			port.link = co.GenName("gre")
 		}
+		key, _ := strconv.Atoi(values[2])
 		link := &netlink.Gretap{
+			IKey: uint32(key),
+			OKey: uint32(key),
 			LinkAttrs: netlink.LinkAttrs{
 				Name: port.link,
 				MTU:  1460,