[ONOS-3856] BGP flow specification extended community path attribute parsing.

Change-Id: I9ea9db5565e91598328fdb703186c3d6577e2dc7
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/util/Constants.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/util/Constants.java
index 33fdfc8..8d68742 100644
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/util/Constants.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/util/Constants.java
@@ -48,6 +48,8 @@
     public static final int ENHANCED = 0x20;
     public static final int RESERVED = 0x40;
 
+    public static final byte BGP_EXTENDED_COMMUNITY = 0x10;
+
     public static final byte BGP_FLOWSPEC_DST_PREFIX = 0x01;
     public static final byte BGP_FLOWSPEC_SRC_PREFIX = 0x02;
     public static final byte BGP_FLOWSPEC_IP_PROTO = 0x03;