1 files changed, 7 insertions, 3 deletions

diff --git a/framework/src/onos/apps/routing-api/src/main/java/org/onosproject/routing/RouteEntry.java b/framework/src/onos/apps/routing-api/src/main/java/org/onosproject/routing/RouteEntry.java
index 2b0ef989..8204a109 100644
--- a/framework/src/onos/apps/routing-api/src/main/java/org/onosproject/routing/RouteEntry.java
+++ b/framework/src/onos/apps/routing-api/src/main/java/org/onosproject/routing/RouteEntry.java
@@ -89,14 +89,17 @@ public class RouteEntry {
     /**
      * Creates the binary string representation of an IP prefix.
      * The prefix can be either IPv4 or IPv6.
-     * The string length is equal to the prefix length.
+     * The string length is equal to the prefix length + 1.
+     *
+     * For each string, we put a extra "0" in the front. The purpose of
+     * doing this is to store the default route inside InvertedRadixTree.
      *
      * @param ipPrefix the IP prefix to use
      * @return the binary string representation
      */
     public static String createBinaryString(IpPrefix ipPrefix) {
         if (ipPrefix.prefixLength() == 0) {
-            return "";
+            return "0";
         }
 
         byte[] octets = ipPrefix.address().toOctets();
@@ -109,7 +112,8 @@ public class RouteEntry {
             boolean isSet = ((value & mask) != 0);
             result.append(isSet ? "1" : "0");
         }
-        return result.toString();
+
+        return "0" + result.toString();
     }
 
     @Override