diff --git a/bgpd/bgp_nht.h b/bgpd/bgp_nht.h
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+++ b/bgpd/bgp_nht.h
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+/* BGP Nexthop tracking
+ * Copyright (C) 2013 Cumulus Networks, Inc.
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _BGP_NHT_H
+#define _BGP_NHT_H
+
+/**
+ * bgp_parse_nexthop_update() - parse a nexthop update message from Zebra.
+ */
+extern void bgp_parse_nexthop_update(void);
+
+/**
+ * bgp_find_nexthop() - lookup the nexthop cache table for the bnc object
+ * ARGUMENTS:
+ *   p - path for which the nexthop object is being looked up
+ *   c - output variable that stores whether the nexthop object has changed
+ *        since last time.
+ *   m - output variable that stores whether the nexthop metric has changed
+ *        since last time.
+ */
+extern int bgp_find_nexthop(struct bgp_info *p, int *c, int *m);
+
+/**
+ * bgp_find_or_add_nexthop() - lookup the nexthop cache table for the bnc
+ *  object. If not found, create a new object and register with ZEBRA for
+ *  nexthop notification.
+ * ARGUMENTS:
+ *   a - afi: AFI_IP or AF_IP6
+ *   p - path for which the nexthop object is being looked up
+ *   c - output variable that stores whether the nexthop object has changed
+ *        since last time.
+ *   m - output variable that stores whether the nexthop metric has changed
+ *        since last time.
+ */
+extern int bgp_find_or_add_nexthop(afi_t a, struct bgp_info *p, int *c, int *m);
+
+/**
+ * bgp_unlink_nexthop() - Unlink the nexthop object from the path structure.
+ * ARGUMENTS:
+ *   p - path structure.
+ */
+extern void bgp_unlink_nexthop(struct bgp_info *p);
+
+#endif /* _BGP_NHT_H */