diff --git a/plugin/sdnController/src/main/java/org/zstack/sdnController/SdnControllerBase.java b/plugin/sdnController/src/main/java/org/zstack/sdnController/SdnControllerBase.java
index f4733f6a833..8ff809fd308 100644
--- a/plugin/sdnController/src/main/java/org/zstack/sdnController/SdnControllerBase.java
+++ b/plugin/sdnController/src/main/java/org/zstack/sdnController/SdnControllerBase.java
@@ -86,6 +86,10 @@ public String getSdnControllerSignature() {
         return "sdn-controller-" + self.getUuid();
     }
 
+    public String getSdnControllerHostSignature(String hostUuid) {
+        return "sdn-controller-" + self.getUuid() + "-host-" + hostUuid;
+    }
+
     protected SdnController getSdnController() {
         SdnControllerFactory factory = sdnMgr.getSdnControllerFactory(self.getVendorType());
         return factory.getSdnController(self);
@@ -427,7 +431,7 @@ private void sdnControllerAddHost(APISdnControllerAddHostMsg msg, Completion com
         thdf.chainSubmit(new ChainTask(completion) {
             @Override
             public String getSyncSignature() {
-                return getSdnControllerSignature();
+                return getSdnControllerHostSignature(msg.getHostUuid());
             }
 
             @Override
@@ -508,7 +512,7 @@ private void sdnControllerRemoveHostInQueue(SdnControllerRemoveHostMsg msg, Comp
         thdf.chainSubmit(new ChainTask(completion) {
             @Override
             public String getSyncSignature() {
-                return getSdnControllerSignature();
+                return getSdnControllerHostSignature(msg.getHostUuid());
             }
 
             @Override
@@ -594,7 +598,7 @@ private void doControllerChangeHost(APISdnControllerChangeHostMsg msg, Completio
         thdf.chainSubmit(new ChainTask(completion) {
             @Override
             public String getSyncSignature() {
-                return getSdnControllerSignature();
+                return getSdnControllerHostSignature(msg.getHostUuid());
             }
 
             @Override