4 Octet AS Path Capability is sent to neighbor.
4 Octet AS in AS_PATH is parsed.
Now BGP can establish 4 Octet AS Path enabled peering with neighbor.

Change-Id: Ibb72e8037554928584ccafe6a14b82ffaca7e2cd
diff --git a/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpConstants.java b/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpConstants.java
index 0cb74cf..1d7d4c5 100644
--- a/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpConstants.java
+++ b/apps/sdnip/src/main/java/org/onosproject/sdnip/bgp/BgpConstants.java
@@ -227,6 +227,12 @@
             /** BGP UPDATE Attributes Type Code AS_PATH. */
             public static final int TYPE = 2;
 
+            /** BGP AS length. */
+            public static final int AS_LENGTH = 2;
+
+            /** BGP 4 Octet AS length (RFC 6793). */
+            public static final int AS_4OCTET_LENGTH = 4;
+
             /** BGP UPDATE AS_PATH Type: AS_SET. */
             public static final int AS_SET = 1;