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diff --git a/isisd/isis_adjacency.h b/isisd/isis_adjacency.h
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+/*
+ * IS-IS Rout(e)ing protocol - isis_adjacency.h   
+ *                             IS-IS adjacency handling
+ *
+ * Copyright (C) 2001,2002   Sampo Saaristo
+ *                           Tampere University of Technology      
+ *                           Institute of Communications Engineering
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public Licenseas published by the Free 
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc., 
+ * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef _ZEBRA_ISIS_ADJACENCY_H
+#define _ZEBRA_ISIS_ADJACENCY_H
+
+enum isis_adj_usage
+{
+  ISIS_ADJ_NONE,
+  ISIS_ADJ_LEVEL1,
+  ISIS_ADJ_LEVEL2,
+  ISIS_ADJ_LEVEL1AND2
+};
+
+enum isis_system_type 
+{
+  ISIS_SYSTYPE_UNKNOWN,
+  ISIS_SYSTYPE_ES,
+  ISIS_SYSTYPE_IS,
+  ISIS_SYSTYPE_L1_IS,
+  ISIS_SYSTYPE_L2_IS
+};
+
+enum isis_adj_state 
+{
+  ISIS_ADJ_INITIALIZING,
+  ISIS_ADJ_UP,
+  ISIS_ADJ_DOWN
+};
+
+/*
+ * we use the following codes to give an indication _why_
+ * a specific adjacency is up or down
+ */
+enum isis_adj_updown_reason
+{
+  ISIS_ADJ_REASON_SEENSELF,
+  ISIS_ADJ_REASON_AREA_MISMATCH,
+  ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
+  ISIS_ADJ_REASON_AUTH_FAILED,
+  ISIS_ADJ_REASON_CHECKSUM_FAILED
+};
+
+#define DIS_RECORDS 8 /* keep the last 8 DIS state changes on record */
+
+struct isis_dis_record {
+  int                              dis; /* is our neighbor the DIS ? */          time_t               last_dis_change; /* timestamp for last dis change */
+};
+
+struct isis_adjacency{
+  u_char snpa[ETH_ALEN];           /* NeighbourSNPAAddress */ 
+  u_char sysid[ISIS_SYS_ID_LEN];   /* neighbourSystemIdentifier */
+  u_char lanid[ISIS_SYS_ID_LEN+1]; /* LAN id on bcast circuits */
+  int dischanges[ISIS_LEVELS];     /* how many DIS changes ?*/ 
+  /* an array of N levels for M records */
+  struct isis_dis_record  dis_record[DIS_RECORDS * ISIS_LEVELS]; 
+  enum isis_adj_state adj_state;  /* adjacencyState */
+  enum isis_adj_usage adj_usage;  /* adjacencyUsage */
+  struct list *area_addrs;        /* areaAdressesOfNeighbour */
+  struct nlpids nlpids;           /* protocols spoken ... */
+  struct list *ipv4_addrs;
+#ifdef HAVE_IPV6
+  struct list *ipv6_addrs;
+#endif /* HAVE_IPV6 */
+  u_char prio[ISIS_LEVELS];        /* priorityOfNeighbour for DIS*/
+  int circuit_t;                   /* from hello PDU hdr */
+  int level;                       /* level (1 or 2) */
+  enum  isis_system_type sys_type; /* neighbourSystemType */
+  u_int16_t hold_time;             /* entryRemainingTime */
+  u_int32_t last_upd;
+  u_int32_t last_flap;             /* last time the adj flapped */
+  int flaps;                       /* number of adjacency flaps  */
+  struct thread *t_expire;         /* expire after hold_time  */
+  struct isis_circuit *circuit;    /* back pointer */     
+};
+
+
+struct isis_adjacency *isis_adj_lookup (u_char *sysid, struct list *adjdb);
+struct isis_adjacency *isis_adj_lookup_snpa (u_char *ssnpa, 
+					     struct list *adjdb);
+struct isis_adjacency *isis_new_adj (u_char *id, u_char *snpa, int level, 
+                                     struct isis_circuit *circuit); 
+void isis_delete_adj (struct isis_adjacency *adj, struct list *adjdb); 
+void isis_adj_state_change (struct isis_adjacency *adj, 
+                            enum isis_adj_state state, char *reason); 
+void isis_adj_print (struct isis_adjacency *adj); 
+int  isis_adj_expire (struct thread *thread);
+void isis_adj_print_vty (struct isis_adjacency *adj, struct vty *vty);
+void isis_adj_print_vty_detail (struct isis_adjacency *adj, struct vty *vty);
+void isis_adj_print_vty_extensive (struct isis_adjacency *adj, 
+                                   struct vty *vty);
+void isis_adj_p2p_print_vty (struct isis_adjacency *adj, struct vty *vty);
+void isis_adj_p2p_print_vty_detail (struct isis_adjacency *adj, 
+                                    struct vty *vty);
+void isis_adj_p2p_print_vty_extensive (struct isis_adjacency *adj, 
+                                       struct vty *vty);
+
+void isis_adj_build_neigh_list (struct list *adjdb, struct list *list);
+void isis_adj_build_up_list (struct list *adjdb, struct list *list);
+void isis_adjdb_iterate (struct list *adjdb, 
+                         void (*func)(struct isis_adjacency*, 
+                                      void *), void *arg);
+
+#endif /* ISIS_ADJACENCY_H */
+