diff --git a/src/main/java/net/onrc/onos/core/linkdiscovery/internal/EventHistoryTopologyLink.java b/src/main/java/net/onrc/onos/core/linkdiscovery/internal/EventHistoryTopologyLink.java
new file mode 100644
index 0000000..378859f
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/linkdiscovery/internal/EventHistoryTopologyLink.java
@@ -0,0 +1,62 @@
+package net.onrc.onos.core.linkdiscovery.internal;
+
+import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
+
+import org.codehaus.jackson.annotate.JsonProperty;
+import org.codehaus.jackson.map.annotate.JsonSerialize;
+
+/***
+ * Topology link up/down event history related classes and members
+ * @author subrata
+ *
+ */
+public class EventHistoryTopologyLink {
+    // The following fields are not stored as String to save memory
+    // They should be converted to appropriate human-readable strings by 
+    // the front end (e.g. in cli in Python)
+    public long     srcSwDpid;
+    public long     dstSwDpid;
+    public int      srcPortState;
+    public int      dstPortState;
+    public int      srcSwport;
+    public int      dstSwport;
+    public String   linkType;
+    public String   reason;
+    
+    @JsonProperty("Source-Switch")
+    @JsonSerialize(using=DPIDSerializer.class)
+    public long getSrcSwDpid() {
+        return srcSwDpid;
+    }
+    @JsonProperty("Dest-Switch")
+    @JsonSerialize(using=DPIDSerializer.class)
+    public long getDstSwDpid() {
+        return dstSwDpid;
+    }
+    @JsonProperty("SrcPortState")
+    public int getSrcPortState() {
+        return srcPortState;
+    }
+    @JsonProperty("DstPortState")
+    public int getDstPortState() {
+        return dstPortState;
+    }
+    @JsonProperty("SrcPort")
+    public int getSrcSwport() {
+        return srcSwport;
+    }
+    @JsonProperty("DstPort")
+    public int getDstSwport() {
+        return dstSwport;
+    }
+    @JsonProperty("LinkType")
+    public String getLinkType() {
+        return linkType;
+    }
+    @JsonProperty("Reason")
+    public String getReason() {
+        return reason;
+    }
+    
+    
+}