Preliminary checkin for implementing version aware topology state.
diff --git a/core/store/src/main/java/org/onlab/onos/store/serializers/OnosTimestampSerializer.java b/core/store/src/main/java/org/onlab/onos/store/serializers/OnosTimestampSerializer.java
index 812bc9d..192e035 100644
--- a/core/store/src/main/java/org/onlab/onos/store/serializers/OnosTimestampSerializer.java
+++ b/core/store/src/main/java/org/onlab/onos/store/serializers/OnosTimestampSerializer.java
@@ -1,6 +1,5 @@
 package org.onlab.onos.store.serializers;
 
-import org.onlab.onos.net.ElementId;
 import org.onlab.onos.store.impl.OnosTimestamp;
 
 import com.esotericsoftware.kryo.Kryo;
@@ -20,18 +19,17 @@
         // non-null, immutable
         super(false, true);
     }
+
     @Override
     public void write(Kryo kryo, Output output, OnosTimestamp object) {
-        kryo.writeClassAndObject(output, object.id());
         output.writeInt(object.termNumber());
         output.writeInt(object.sequenceNumber());
     }
 
     @Override
     public OnosTimestamp read(Kryo kryo, Input input, Class<OnosTimestamp> type) {
-        ElementId id = (ElementId) kryo.readClassAndObject(input);
         final int term = input.readInt();
         final int sequence = input.readInt();
-        return new OnosTimestamp(id, term, sequence);
+        return new OnosTimestamp(term, sequence);
     }
 }