diff --git a/ripd/rip_interface.c b/ripd/rip_interface.c
new file mode 100644
index 0000000..06d4416
--- /dev/null
+++ b/ripd/rip_interface.c
@@ -0,0 +1,2001 @@
+/* Interface related function for RIP.
+ * Copyright (C) 1997, 98 Kunihiro Ishiguro <kunihiro@zebra.org>
+ *
+ * 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.  
+ */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "if.h"
+#include "sockunion.h"
+#include "prefix.h"
+#include "memory.h"
+#include "network.h"
+#include "table.h"
+#include "log.h"
+#include "stream.h"
+#include "thread.h"
+#include "zclient.h"
+#include "filter.h"
+#include "sockopt.h"
+
+#include "zebra/connected.h"
+
+#include "ripd/ripd.h"
+#include "ripd/rip_debug.h"
+
+void rip_enable_apply (struct interface *);
+void rip_passive_interface_apply (struct interface *);
+int rip_if_down(struct interface *ifp);
+
+struct message ri_version_msg[] = 
+{
+  {RI_RIP_VERSION_1,       "1"},
+  {RI_RIP_VERSION_2,       "2"},
+  {RI_RIP_VERSION_1_AND_2, "1 2"},
+  {0,                      NULL}
+};
+
+/* RIP enabled network vector. */
+vector rip_enable_interface;
+
+/* RIP enabled interface table. */
+struct route_table *rip_enable_network;
+
+/* Vector to store passive-interface name. */
+vector Vrip_passive_interface;
+
+/* Join to the RIP version 2 multicast group. */
+int
+ipv4_multicast_join (int sock, 
+		     struct in_addr group, 
+		     struct in_addr ifa,
+		     unsigned int ifindex)
+{
+  int ret;
+
+  ret = setsockopt_multicast_ipv4 (sock, 
+				   IP_ADD_MEMBERSHIP, 
+				   ifa, 
+				   group.s_addr, 
+				   ifindex); 
+
+  if (ret < 0) 
+    zlog (NULL, LOG_INFO, "can't setsockopt IP_ADD_MEMBERSHIP %s",
+	  strerror (errno));
+
+  return ret;
+}
+
+/* Leave from the RIP version 2 multicast group. */
+int
+ipv4_multicast_leave (int sock, 
+		      struct in_addr group, 
+		      struct in_addr ifa,
+		      unsigned int ifindex)
+{
+  int ret;
+
+  ret = setsockopt_multicast_ipv4 (sock, 
+				   IP_DROP_MEMBERSHIP, 
+				   ifa, 
+				   group.s_addr, 
+				   ifindex);
+
+  if (ret < 0) 
+    zlog (NULL, LOG_INFO, "can't setsockopt IP_DROP_MEMBERSHIP");
+
+  return ret;
+}
+
+/* Allocate new RIP's interface configuration. */
+struct rip_interface *
+rip_interface_new ()
+{
+  struct rip_interface *ri;
+
+  ri = XMALLOC (MTYPE_RIP_INTERFACE, sizeof (struct rip_interface));
+  memset (ri, 0, sizeof (struct rip_interface));
+
+  /* Default authentication type is simple password for Cisco
+     compatibility. */
+  /* ri->auth_type = RIP_NO_AUTH; */
+  ri->auth_type = RIP_AUTH_SIMPLE_PASSWORD;
+
+  /* Set default split-horizon behavior.  If the interface is Frame
+     Relay or SMDS is enabled, the default value for split-horizon is
+     off.  But currently Zebra does detect Frame Relay or SMDS
+     interface.  So all interface is set to split horizon.  */
+  ri->split_horizon_default = 1;
+  ri->split_horizon = ri->split_horizon_default;
+
+  return ri;
+}
+
+void
+rip_interface_multicast_set (int sock, struct interface *ifp)
+{
+  int ret;
+  listnode node;
+  struct servent *sp;
+  struct sockaddr_in from;
+
+  for (node = listhead (ifp->connected); node; nextnode (node))
+    {
+      struct prefix_ipv4 *p;
+      struct connected *connected;
+      struct in_addr addr;
+
+      connected = getdata (node);
+      p = (struct prefix_ipv4 *) connected->address;
+
+      if (p->family == AF_INET)
+	{
+	  addr = p->prefix;
+
+	  if (setsockopt_multicast_ipv4 (sock, IP_MULTICAST_IF,
+					 addr, 0, ifp->ifindex) < 0) 
+	    {
+	      zlog_warn ("Can't setsockopt IP_MULTICAST_IF to fd %d", sock);
+	      return;
+	    }
+
+	  /* Bind myself. */
+	  memset (&from, 0, sizeof (struct sockaddr_in));
+
+	  /* Set RIP port. */
+	  sp = getservbyname ("router", "udp");
+	  if (sp) 
+	    from.sin_port = sp->s_port;
+	  else 
+	    from.sin_port = htons (RIP_PORT_DEFAULT);
+
+	  /* Address shoud be any address. */
+	  from.sin_family = AF_INET;
+	  from.sin_addr = addr;
+#ifdef HAVE_SIN_LEN
+	  from.sin_len = sizeof (struct sockaddr_in);
+#endif /* HAVE_SIN_LEN */
+
+	  ret = bind (sock, (struct sockaddr *) & from, 
+		      sizeof (struct sockaddr_in));
+	  if (ret < 0)
+	    {
+	      zlog_warn ("Can't bind socket: %s", strerror (errno));
+	      return;
+	    }
+
+	  return;
+
+	}
+    }
+}
+
+/* Send RIP request packet to specified interface. */
+void
+rip_request_interface_send (struct interface *ifp, u_char version)
+{
+  struct sockaddr_in to;
+
+  /* RIPv2 support multicast. */
+  if (version == RIPv2 && if_is_multicast (ifp))
+    {
+      
+      if (IS_RIP_DEBUG_EVENT)
+	zlog_info ("multicast request on %s", ifp->name);
+
+      rip_request_send (NULL, ifp, version);
+      return;
+    }
+
+  /* RIPv1 and non multicast interface. */
+  if (if_is_pointopoint (ifp) || if_is_broadcast (ifp))
+    {
+      listnode cnode;
+
+      if (IS_RIP_DEBUG_EVENT)
+	zlog_info ("broadcast request to %s", ifp->name);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct prefix_ipv4 *p;
+	  struct connected *connected;
+
+	  connected = getdata (cnode);
+	  p = (struct prefix_ipv4 *) connected->destination;
+
+	  if (p->family == AF_INET)
+	    {
+	      memset (&to, 0, sizeof (struct sockaddr_in));
+	      to.sin_port = htons (RIP_PORT_DEFAULT);
+	      to.sin_addr = p->prefix;
+
+#if 0
+	      if (IS_RIP_DEBUG_EVENT)
+		zlog_info ("SEND request to %s", inet_ntoa (to.sin_addr));
+#endif /* 0 */
+	      
+	      rip_request_send (&to, ifp, version);
+	    }
+	}
+    }
+}
+
+/* This will be executed when interface goes up. */
+void
+rip_request_interface (struct interface *ifp)
+{
+  struct rip_interface *ri;
+
+  /* In default ripd doesn't send RIP_REQUEST to the loopback interface. */
+  if (if_is_loopback (ifp))
+    return;
+
+  /* If interface is down, don't send RIP packet. */
+  if (! if_is_up (ifp))
+    return;
+
+  /* Fetch RIP interface information. */
+  ri = ifp->info;
+
+
+  /* If there is no version configuration in the interface,
+     use rip's version setting. */
+  if (ri->ri_send == RI_RIP_UNSPEC)
+    {
+      if (rip->version == RIPv1)
+	rip_request_interface_send (ifp, RIPv1);
+      else
+	rip_request_interface_send (ifp, RIPv2);
+    }
+  /* If interface has RIP version configuration use it. */
+  else
+    {
+      if (ri->ri_send & RIPv1)
+	rip_request_interface_send (ifp, RIPv1);
+      if (ri->ri_send & RIPv2)
+	rip_request_interface_send (ifp, RIPv2);
+    }
+}
+
+/* Send RIP request to the neighbor. */
+void
+rip_request_neighbor (struct in_addr addr)
+{
+  struct sockaddr_in to;
+
+  memset (&to, 0, sizeof (struct sockaddr_in));
+  to.sin_port = htons (RIP_PORT_DEFAULT);
+  to.sin_addr = addr;
+
+  rip_request_send (&to, NULL, rip->version);
+}
+
+/* Request routes at all interfaces. */
+void
+rip_request_neighbor_all ()
+{
+  struct route_node *rp;
+
+  if (! rip)
+    return;
+
+  if (IS_RIP_DEBUG_EVENT)
+    zlog_info ("request to the all neighbor");
+
+  /* Send request to all neighbor. */
+  for (rp = route_top (rip->neighbor); rp; rp = route_next (rp))
+    if (rp->info)
+      rip_request_neighbor (rp->p.u.prefix4);
+}
+
+/* Multicast packet receive socket. */
+int
+rip_multicast_join (struct interface *ifp, int sock)
+{
+  listnode cnode;
+
+  if (if_is_up (ifp) && if_is_multicast (ifp))
+    {
+      if (IS_RIP_DEBUG_EVENT)
+	zlog_info ("multicast join at %s", ifp->name);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct prefix_ipv4 *p;
+	  struct connected *connected;
+	  struct in_addr group;
+	      
+	  connected = getdata (cnode);
+	  p = (struct prefix_ipv4 *) connected->address;
+      
+	  if (p->family != AF_INET)
+	    continue;
+      
+	  group.s_addr = htonl (INADDR_RIP_GROUP);
+	  if (ipv4_multicast_join (sock, group, p->prefix, ifp->ifindex) < 0)
+	    return -1;
+	  else
+	    return 0;
+	}
+    }
+  return 0;
+}
+
+/* Leave from multicast group. */
+void
+rip_multicast_leave (struct interface *ifp, int sock)
+{
+  listnode cnode;
+
+  if (if_is_up (ifp) && if_is_multicast (ifp))
+    {
+      if (IS_RIP_DEBUG_EVENT)
+	zlog_info ("multicast leave from %s", ifp->name);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct prefix_ipv4 *p;
+	  struct connected *connected;
+	  struct in_addr group;
+	      
+	  connected = getdata (cnode);
+	  p = (struct prefix_ipv4 *) connected->address;
+      
+	  if (p->family != AF_INET)
+	    continue;
+      
+	  group.s_addr = htonl (INADDR_RIP_GROUP);
+          if (ipv4_multicast_leave (sock, group, p->prefix, ifp->ifindex) == 0)
+	    return;
+        }
+    }
+}
+
+/* Is there and address on interface that I could use ? */
+int
+rip_if_ipv4_address_check (struct interface *ifp)
+{
+  struct listnode *nn;
+  struct connected *connected;
+  int count = 0;
+
+  for (nn = listhead (ifp->connected); nn; nextnode (nn))
+    if ((connected = getdata (nn)) != NULL)
+      {
+	struct prefix *p;
+
+	p = connected->address;
+
+	if (p->family == AF_INET)
+          {
+	    count++;
+	  }
+      }
+						
+  return count;
+}
+						
+						
+						
+
+/* Does this address belongs to me ? */
+int
+if_check_address (struct in_addr addr)
+{
+  listnode node;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      listnode cnode;
+      struct interface *ifp;
+
+      ifp = getdata (node);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct connected *connected;
+	  struct prefix_ipv4 *p;
+
+	  connected = getdata (cnode);
+	  p = (struct prefix_ipv4 *) connected->address;
+
+	  if (p->family != AF_INET)
+	    continue;
+
+	  if (IPV4_ADDR_CMP (&p->prefix, &addr) == 0)
+	    return 1;
+	}
+    }
+  return 0;
+}
+
+/* is this address from a valid neighbor? (RFC2453 - Sec. 3.9.2) */
+int
+if_valid_neighbor (struct in_addr addr)
+{
+  listnode node;
+  struct connected *connected = NULL;
+  struct prefix_ipv4 *p;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      listnode cnode;
+      struct interface *ifp;
+
+      ifp = getdata (node);
+
+      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
+	{
+	  struct prefix *pxn = NULL; /* Prefix of the neighbor */
+	  struct prefix *pxc = NULL; /* Prefix of the connected network */
+
+	  connected = getdata (cnode);
+
+	  if (if_is_pointopoint (ifp))
+	    {
+	      p = (struct prefix_ipv4 *) connected->address;
+
+	      if (p && p->family == AF_INET)
+		{
+		  if (IPV4_ADDR_SAME (&p->prefix, &addr))
+		    return 1;
+
+		  p = (struct prefix_ipv4 *) connected->destination;
+		  if (p && IPV4_ADDR_SAME (&p->prefix, &addr))
+		    return 1;
+		}
+	    }
+	  else
+	    {
+	      p = (struct prefix_ipv4 *) connected->address;
+
+	      if (p->family != AF_INET)
+		continue;
+
+	      pxn = prefix_new();
+	      pxn->family = AF_INET;
+	      pxn->prefixlen = 32;
+	      pxn->u.prefix4 = addr;
+	      
+	      pxc = prefix_new();
+	      prefix_copy(pxc, (struct prefix *) p);
+	      apply_mask(pxc);
+	  
+	      if (prefix_match (pxc, pxn)) 
+		{
+		  prefix_free (pxn);
+		  prefix_free (pxc);
+		  return 1;
+		}
+	      prefix_free(pxc);
+	      prefix_free(pxn);
+	    }
+	}
+    }
+  return 0;
+}
+
+/* Inteface link down message processing. */
+int
+rip_interface_down (int command, struct zclient *zclient, zebra_size_t length)
+{
+  struct interface *ifp;
+  struct stream *s;
+
+  s = zclient->ibuf;  
+
+  /* zebra_interface_state_read() updates interface structure in
+     iflist. */
+  ifp = zebra_interface_state_read(s);
+
+  if (ifp == NULL)
+    return 0;
+
+  rip_if_down(ifp);
+ 
+  if (IS_RIP_DEBUG_ZEBRA)
+    zlog_info ("interface %s index %d flags %ld metric %d mtu %d is down",
+	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);
+
+  return 0;
+}
+
+/* Inteface link up message processing */
+int
+rip_interface_up (int command, struct zclient *zclient, zebra_size_t length)
+{
+  struct interface *ifp;
+
+  /* zebra_interface_state_read () updates interface structure in
+     iflist. */
+  ifp = zebra_interface_state_read (zclient->ibuf);
+
+  if (ifp == NULL)
+    return 0;
+
+  if (IS_RIP_DEBUG_ZEBRA)
+    zlog_info ("interface %s index %d flags %ld metric %d mtu %d is up",
+	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);
+
+  /* Check if this interface is RIP enabled or not.*/
+  rip_enable_apply (ifp);
+ 
+  /* Check for a passive interface */
+  rip_passive_interface_apply (ifp);
+
+  /* Apply distribute list to the all interface. */
+  rip_distribute_update_interface (ifp);
+
+  return 0;
+}
+
+/* Inteface addition message from zebra. */
+int
+rip_interface_add (int command, struct zclient *zclient, zebra_size_t length)
+{
+  struct interface *ifp;
+
+  ifp = zebra_interface_add_read (zclient->ibuf);
+
+  if (IS_RIP_DEBUG_ZEBRA)
+    zlog_info ("interface add %s index %d flags %ld metric %d mtu %d",
+	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);
+
+  /* Check if this interface is RIP enabled or not.*/
+  rip_enable_apply (ifp);
+
+  /* Apply distribute list to the all interface. */
+  rip_distribute_update_interface (ifp);
+
+  /* rip_request_neighbor_all (); */
+
+  return 0;
+}
+
+int
+rip_interface_delete (int command, struct zclient *zclient,
+		      zebra_size_t length)
+{
+  struct interface *ifp;
+  struct stream *s;
+
+
+  s = zclient->ibuf;  
+  /* zebra_interface_state_read() updates interface structure in iflist */
+  ifp = zebra_interface_state_read(s);
+
+  if (ifp == NULL)
+    return 0;
+
+  if (if_is_up (ifp)) {
+    rip_if_down(ifp);
+  } 
+  
+  zlog_info("interface delete %s index %d flags %ld metric %d mtu %d",
+	    ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);  
+  
+  /* To support pseudo interface do not free interface structure.  */
+  /* if_delete(ifp); */
+
+  return 0;
+}
+
+void
+rip_interface_clean ()
+{
+  listnode node;
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      ifp = getdata (node);
+      ri = ifp->info;
+
+      ri->enable_network = 0;
+      ri->enable_interface = 0;
+      ri->running = 0;
+
+      if (ri->t_wakeup)
+	{
+	  thread_cancel (ri->t_wakeup);
+	  ri->t_wakeup = NULL;
+	}
+    }
+}
+
+void
+rip_interface_reset ()
+{
+  listnode node;
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      ifp = getdata (node);
+      ri = ifp->info;
+
+      ri->enable_network = 0;
+      ri->enable_interface = 0;
+      ri->running = 0;
+
+      ri->ri_send = RI_RIP_UNSPEC;
+      ri->ri_receive = RI_RIP_UNSPEC;
+
+      /* ri->auth_type = RIP_NO_AUTH; */
+      ri->auth_type = RIP_AUTH_SIMPLE_PASSWORD;
+
+      if (ri->auth_str)
+	{
+	  free (ri->auth_str);
+	  ri->auth_str = NULL;
+	}
+      if (ri->key_chain)
+	{
+	  free (ri->key_chain);
+	  ri->key_chain = NULL;
+	}
+
+      ri->split_horizon = 0;
+      ri->split_horizon_default = 0;
+
+      ri->list[RIP_FILTER_IN] = NULL;
+      ri->list[RIP_FILTER_OUT] = NULL;
+
+      ri->prefix[RIP_FILTER_IN] = NULL;
+      ri->prefix[RIP_FILTER_OUT] = NULL;
+      
+      if (ri->t_wakeup)
+	{
+	  thread_cancel (ri->t_wakeup);
+	  ri->t_wakeup = NULL;
+	}
+
+      ri->recv_badpackets = 0;
+      ri->recv_badroutes = 0;
+      ri->sent_updates = 0;
+
+      ri->passive = 0;
+    }
+}
+
+int
+rip_if_down(struct interface *ifp)
+{
+  struct route_node *rp;
+  struct rip_info *rinfo;
+  struct rip_interface *ri = NULL;
+  if (rip)
+    {
+      for (rp = route_top (rip->table); rp; rp = route_next (rp))
+	if ((rinfo = rp->info) != NULL)
+	  {
+	    /* Routes got through this interface. */
+	    if (rinfo->ifindex == ifp->ifindex &&
+		rinfo->type == ZEBRA_ROUTE_RIP &&
+		rinfo->sub_type == RIP_ROUTE_RTE)
+	      {
+		rip_zebra_ipv4_delete ((struct prefix_ipv4 *) &rp->p,
+				       &rinfo->nexthop,
+				       rinfo->ifindex);
+
+		rip_redistribute_delete (rinfo->type,rinfo->sub_type,
+					 (struct prefix_ipv4 *)&rp->p,
+					 rinfo->ifindex);
+	      }
+	    else
+	      {
+		/* All redistributed routes but static and system */
+		if ((rinfo->ifindex == ifp->ifindex) &&
+		    (rinfo->type != ZEBRA_ROUTE_STATIC) &&
+		    (rinfo->type != ZEBRA_ROUTE_SYSTEM))
+		  rip_redistribute_delete (rinfo->type,rinfo->sub_type,
+					   (struct prefix_ipv4 *)&rp->p,
+					   rinfo->ifindex);
+	      }
+	  }
+    }
+	    
+  ri = ifp->info;
+  
+  if (ri->running)
+   {
+     if (IS_RIP_DEBUG_EVENT)
+       zlog_info ("turn off %s", ifp->name);
+
+     /* Leave from multicast group. */
+     rip_multicast_leave (ifp, rip->sock);
+
+     ri->running = 0;
+   }
+
+  return 0;
+}
+
+/* Needed for stop RIP process. */
+void
+rip_if_down_all ()
+{
+  struct interface *ifp;
+  listnode node;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      ifp = getdata (node);
+      rip_if_down (ifp);
+    }
+}
+
+int
+rip_interface_address_add (int command, struct zclient *zclient,
+			   zebra_size_t length)
+{
+  struct connected *ifc;
+  struct prefix *p;
+
+  ifc = zebra_interface_address_add_read (zclient->ibuf);
+
+  if (ifc == NULL)
+    return 0;
+
+  p = ifc->address;
+
+  if (p->family == AF_INET)
+    {
+      if (IS_RIP_DEBUG_ZEBRA)
+	zlog_info ("connected address %s/%d is added", 
+		   inet_ntoa (p->u.prefix4), p->prefixlen);
+      
+      /* Check is this interface is RIP enabled or not.*/
+      rip_enable_apply (ifc->ifp);
+
+#ifdef HAVE_SNMP
+      rip_ifaddr_add (ifc->ifp, ifc);
+#endif /* HAVE_SNMP */
+    }
+
+  return 0;
+}
+
+int
+rip_interface_address_delete (int command, struct zclient *zclient,
+			      zebra_size_t length)
+{
+  struct connected *ifc;
+  struct prefix *p;
+
+  ifc = zebra_interface_address_delete_read (zclient->ibuf);
+  
+  if (ifc)
+    {
+      p = ifc->address;
+      if (p->family == AF_INET)
+	{
+	  if (IS_RIP_DEBUG_ZEBRA)
+
+	    zlog_info ("connected address %s/%d is deleted",
+		       inet_ntoa (p->u.prefix4), p->prefixlen);
+
+#ifdef HAVE_SNMP
+	  rip_ifaddr_delete (ifc->ifp, ifc);
+#endif /* HAVE_SNMP */
+
+	  /* Check if this interface is RIP enabled or not.*/
+	  rip_enable_apply (ifc->ifp);
+	}
+
+      connected_free (ifc);
+
+    }
+
+  return 0;
+}
+
+/* Check interface is enabled by network statement. */
+int
+rip_enable_network_lookup (struct interface *ifp)
+{
+  struct listnode *nn;
+  struct connected *connected;
+  struct prefix_ipv4 address;
+
+  for (nn = listhead (ifp->connected); nn; nextnode (nn))
+    if ((connected = getdata (nn)) != NULL)
+      {
+	struct prefix *p; 
+	struct route_node *node;
+
+	p = connected->address;
+
+	if (p->family == AF_INET)
+	  {
+	    address.family = AF_INET;
+	    address.prefix = p->u.prefix4;
+	    address.prefixlen = IPV4_MAX_BITLEN;
+	    
+	    node = route_node_match (rip_enable_network,
+				     (struct prefix *)&address);
+	    if (node)
+	      {
+		route_unlock_node (node);
+		return 1;
+	      }
+	  }
+      }
+  return -1;
+}
+
+/* Add RIP enable network. */
+int
+rip_enable_network_add (struct prefix *p)
+{
+  struct route_node *node;
+
+  node = route_node_get (rip_enable_network, p);
+
+  if (node->info)
+    {
+      route_unlock_node (node);
+      return -1;
+    }
+  else
+    node->info = "enabled";
+
+  return 1;
+}
+
+/* Delete RIP enable network. */
+int
+rip_enable_network_delete (struct prefix *p)
+{
+  struct route_node *node;
+
+  node = route_node_lookup (rip_enable_network, p);
+  if (node)
+    {
+      node->info = NULL;
+
+      /* Unlock info lock. */
+      route_unlock_node (node);
+
+      /* Unlock lookup lock. */
+      route_unlock_node (node);
+
+      return 1;
+    }
+  return -1;
+}
+
+/* Check interface is enabled by ifname statement. */
+int
+rip_enable_if_lookup (char *ifname)
+{
+  int i;
+  char *str;
+
+  for (i = 0; i < vector_max (rip_enable_interface); i++)
+    if ((str = vector_slot (rip_enable_interface, i)) != NULL)
+      if (strcmp (str, ifname) == 0)
+	return i;
+  return -1;
+}
+
+/* Add interface to rip_enable_if. */
+int
+rip_enable_if_add (char *ifname)
+{
+  int ret;
+
+  ret = rip_enable_if_lookup (ifname);
+  if (ret >= 0)
+    return -1;
+
+  vector_set (rip_enable_interface, strdup (ifname));
+
+  return 1;
+}
+
+/* Delete interface from rip_enable_if. */
+int
+rip_enable_if_delete (char *ifname)
+{
+  int index;
+  char *str;
+
+  index = rip_enable_if_lookup (ifname);
+  if (index < 0)
+    return -1;
+
+  str = vector_slot (rip_enable_interface, index);
+  free (str);
+  vector_unset (rip_enable_interface, index);
+
+  return 1;
+}
+
+/* Join to multicast group and send request to the interface. */
+int
+rip_interface_wakeup (struct thread *t)
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  /* Get interface. */
+  ifp = THREAD_ARG (t);
+
+  ri = ifp->info;
+  ri->t_wakeup = NULL;
+
+  /* Join to multicast group. */
+  if (rip_multicast_join (ifp, rip->sock) < 0)
+    {
+      zlog_err ("multicast join failed, interface %s not running", ifp->name);
+      return 0;
+    }
+
+  /* Set running flag. */
+  ri->running = 1;
+
+  /* Send RIP request to the interface. */
+  rip_request_interface (ifp);
+
+  return 0;
+}
+
+int rip_redistribute_check (int);
+
+void
+rip_connect_set (struct interface *ifp, int set)
+{
+  struct listnode *nn;
+  struct connected *connected;
+  struct prefix_ipv4 address;
+
+  for (nn = listhead (ifp->connected); nn; nextnode (nn))
+    if ((connected = getdata (nn)) != NULL)
+      {
+	struct prefix *p; 
+	p = connected->address;
+
+	if (p->family != AF_INET)
+	  continue;
+
+	address.family = AF_INET;
+	address.prefix = p->u.prefix4;
+	address.prefixlen = p->prefixlen;
+	apply_mask_ipv4 (&address);
+
+	if (set)
+	  rip_redistribute_add (ZEBRA_ROUTE_CONNECT, RIP_ROUTE_INTERFACE,
+				&address, connected->ifp->ifindex, NULL);
+	else
+	  {
+	    rip_redistribute_delete (ZEBRA_ROUTE_CONNECT, RIP_ROUTE_INTERFACE,
+				     &address, connected->ifp->ifindex);
+	    if (rip_redistribute_check (ZEBRA_ROUTE_CONNECT))
+	      rip_redistribute_add (ZEBRA_ROUTE_CONNECT, RIP_ROUTE_REDISTRIBUTE,
+				    &address, connected->ifp->ifindex, NULL);
+	  }
+      }
+}
+
+/* Update interface status. */
+void
+rip_enable_apply (struct interface *ifp)
+{
+  int ret;
+  struct rip_interface *ri = NULL;
+
+  /* Check interface. */
+  if (if_is_loopback (ifp))
+    return;
+
+  if (! if_is_up (ifp))
+    return;
+
+  ri = ifp->info;
+
+  /* Check network configuration. */
+  ret = rip_enable_network_lookup (ifp);
+
+  /* If the interface is matched. */
+  if (ret > 0)
+    ri->enable_network = 1;
+  else
+    ri->enable_network = 0;
+
+  /* Check interface name configuration. */
+  ret = rip_enable_if_lookup (ifp->name);
+  if (ret >= 0)
+    ri->enable_interface = 1;
+  else
+    ri->enable_interface = 0;
+
+  /* any interface MUST have an IPv4 address */
+  if ( ! rip_if_ipv4_address_check (ifp) )
+    {
+      ri->enable_network = 0;
+      ri->enable_interface = 0;
+    }
+
+  /* Update running status of the interface. */
+  if (ri->enable_network || ri->enable_interface)
+    {
+      if (! ri->running)
+	{
+	  if (IS_RIP_DEBUG_EVENT)
+	    zlog_info ("turn on %s", ifp->name);
+
+	  /* Add interface wake up thread. */
+	  if (! ri->t_wakeup)
+	    ri->t_wakeup = thread_add_timer (master, rip_interface_wakeup,
+					     ifp, 1);
+          rip_connect_set (ifp, 1);
+	}
+    }
+  else
+    {
+      if (ri->running)
+	{
+	  if (IS_RIP_DEBUG_EVENT)
+	    zlog_info ("turn off %s", ifp->name);
+
+	  /* Might as well clean up the route table as well */ 
+	  rip_if_down(ifp);
+
+	  ri->running = 0;
+          rip_connect_set (ifp, 0);
+	}
+    }
+}
+
+/* Apply network configuration to all interface. */
+void
+rip_enable_apply_all ()
+{
+  struct interface *ifp;
+  listnode node;
+
+  /* Check each interface. */
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      ifp = getdata (node);
+      rip_enable_apply (ifp);
+    }
+}
+
+int
+rip_neighbor_lookup (struct sockaddr_in *from)
+{
+  struct prefix_ipv4 p;
+  struct route_node *node;
+
+  memset (&p, 0, sizeof (struct prefix_ipv4));
+  p.family = AF_INET;
+  p.prefix = from->sin_addr;
+  p.prefixlen = IPV4_MAX_BITLEN;
+
+  node = route_node_lookup (rip->neighbor, (struct prefix *) &p);
+  if (node)
+    {
+      route_unlock_node (node);
+      return 1;
+    }
+  return 0;
+}
+
+/* Add new RIP neighbor to the neighbor tree. */
+int
+rip_neighbor_add (struct prefix_ipv4 *p)
+{
+  struct route_node *node;
+
+  node = route_node_get (rip->neighbor, (struct prefix *) p);
+
+  if (node->info)
+    return -1;
+
+  node->info = rip->neighbor;
+
+  return 0;
+}
+
+/* Delete RIP neighbor from the neighbor tree. */
+int
+rip_neighbor_delete (struct prefix_ipv4 *p)
+{
+  struct route_node *node;
+
+  /* Lock for look up. */
+  node = route_node_lookup (rip->neighbor, (struct prefix *) p);
+  if (! node)
+    return -1;
+  
+  node->info = NULL;
+
+  /* Unlock lookup lock. */
+  route_unlock_node (node);
+
+  /* Unlock real neighbor information lock. */
+  route_unlock_node (node);
+
+  return 0;
+}
+
+/* Clear all network and neighbor configuration. */
+void
+rip_clean_network ()
+{
+  int i;
+  char *str;
+  struct route_node *rn;
+
+  /* rip_enable_network. */
+  for (rn = route_top (rip_enable_network); rn; rn = route_next (rn))
+    if (rn->info)
+      {
+	rn->info = NULL;
+	route_unlock_node (rn);
+      }
+
+  /* rip_enable_interface. */
+  for (i = 0; i < vector_max (rip_enable_interface); i++)
+    if ((str = vector_slot (rip_enable_interface, i)) != NULL)
+      {
+	free (str);
+	vector_slot (rip_enable_interface, i) = NULL;
+      }
+}
+
+/* Utility function for looking up passive interface settings. */
+int
+rip_passive_interface_lookup (char *ifname)
+{
+  int i;
+  char *str;
+
+  for (i = 0; i < vector_max (Vrip_passive_interface); i++)
+    if ((str = vector_slot (Vrip_passive_interface, i)) != NULL)
+      if (strcmp (str, ifname) == 0)
+	return i;
+  return -1;
+}
+
+void
+rip_passive_interface_apply (struct interface *ifp)
+{
+  int ret;
+  struct rip_interface *ri;
+
+  ri = ifp->info;
+
+  ret = rip_passive_interface_lookup (ifp->name);
+  if (ret < 0)
+    ri->passive = 0;
+  else
+    ri->passive = 1;
+}
+
+void
+rip_passive_interface_apply_all ()
+{
+  struct interface *ifp;
+  listnode node;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      ifp = getdata (node);
+      rip_passive_interface_apply (ifp);
+    }
+}
+
+/* Passive interface. */
+int
+rip_passive_interface_set (struct vty *vty, char *ifname)
+{
+  if (rip_passive_interface_lookup (ifname) >= 0)
+    return CMD_WARNING;
+
+  vector_set (Vrip_passive_interface, strdup (ifname));
+
+  rip_passive_interface_apply_all ();
+
+  return CMD_SUCCESS;
+}
+
+int
+rip_passive_interface_unset (struct vty *vty, char *ifname)
+{
+  int i;
+  char *str;
+
+  i = rip_passive_interface_lookup (ifname);
+  if (i < 0)
+    return CMD_WARNING;
+
+  str = vector_slot (Vrip_passive_interface, i);
+  free (str);
+  vector_unset (Vrip_passive_interface, i);
+
+  rip_passive_interface_apply_all ();
+
+  return CMD_SUCCESS;
+}
+
+/* Free all configured RIP passive-interface settings. */
+void
+rip_passive_interface_clean ()
+{
+  int i;
+  char *str;
+
+  for (i = 0; i < vector_max (Vrip_passive_interface); i++)
+    if ((str = vector_slot (Vrip_passive_interface, i)) != NULL)
+      {
+	free (str);
+	vector_slot (Vrip_passive_interface, i) = NULL;
+      }
+  rip_passive_interface_apply_all ();
+}
+
+/* RIP enable network or interface configuration. */
+DEFUN (rip_network,
+       rip_network_cmd,
+       "network (A.B.C.D/M|WORD)",
+       "Enable routing on an IP network\n"
+       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
+       "Interface name\n")
+{
+  int ret;
+  struct prefix_ipv4 p;
+
+  ret = str2prefix_ipv4 (argv[0], &p);
+
+  if (ret)
+    ret = rip_enable_network_add ((struct prefix *) &p);
+  else
+    ret = rip_enable_if_add (argv[0]);
+
+  if (ret < 0)
+    {
+      vty_out (vty, "There is a same network configuration %s%s", argv[0],
+	       VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  rip_enable_apply_all ();
+
+  return CMD_SUCCESS;
+}
+
+/* RIP enable network or interface configuration. */
+DEFUN (no_rip_network,
+       no_rip_network_cmd,
+       "no network (A.B.C.D/M|WORD)",
+       NO_STR
+       "Enable routing on an IP network\n"
+       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
+       "Interface name\n")
+{
+  int ret;
+  struct prefix_ipv4 p;
+
+  ret = str2prefix_ipv4 (argv[0], &p);
+
+  if (ret)
+    ret = rip_enable_network_delete ((struct prefix *) &p);
+  else
+    ret = rip_enable_if_delete (argv[0]);
+
+  if (ret < 0)
+    {
+      vty_out (vty, "Can't find network configuration %s%s", argv[0],
+	       VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  rip_enable_apply_all ();
+
+  return CMD_SUCCESS;
+}
+
+/* RIP neighbor configuration set. */
+DEFUN (rip_neighbor,
+       rip_neighbor_cmd,
+       "neighbor A.B.C.D",
+       "Specify a neighbor router\n"
+       "Neighbor address\n")
+{
+  int ret;
+  struct prefix_ipv4 p;
+
+  ret = str2prefix_ipv4 (argv[0], &p);
+
+  if (ret <= 0)
+    {
+      vty_out (vty, "Please specify address by A.B.C.D%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  rip_neighbor_add (&p);
+  
+  return CMD_SUCCESS;
+}
+
+/* RIP neighbor configuration unset. */
+DEFUN (no_rip_neighbor,
+       no_rip_neighbor_cmd,
+       "no neighbor A.B.C.D",
+       NO_STR
+       "Specify a neighbor router\n"
+       "Neighbor address\n")
+{
+  int ret;
+  struct prefix_ipv4 p;
+
+  ret = str2prefix_ipv4 (argv[0], &p);
+
+  if (ret <= 0)
+    {
+      vty_out (vty, "Please specify address by A.B.C.D%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  rip_neighbor_delete (&p);
+  
+  return CMD_SUCCESS;
+}
+
+DEFUN (ip_rip_receive_version,
+       ip_rip_receive_version_cmd,
+       "ip rip receive version (1|2)",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement reception\n"
+       "Version control\n"
+       "RIP version 1\n"
+       "RIP version 2\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1. */
+  if (atoi (argv[0]) == 1)
+    {
+      ri->ri_receive = RI_RIP_VERSION_1;
+      return CMD_SUCCESS;
+    }
+  if (atoi (argv[0]) == 2)
+    {
+      ri->ri_receive = RI_RIP_VERSION_2;
+      return CMD_SUCCESS;
+    }
+  return CMD_WARNING;
+}
+
+DEFUN (ip_rip_receive_version_1,
+       ip_rip_receive_version_1_cmd,
+       "ip rip receive version 1 2",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement reception\n"
+       "Version control\n"
+       "RIP version 1\n"
+       "RIP version 2\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1 and 2. */
+  ri->ri_receive = RI_RIP_VERSION_1_AND_2;
+  return CMD_SUCCESS;
+}
+
+DEFUN (ip_rip_receive_version_2,
+       ip_rip_receive_version_2_cmd,
+       "ip rip receive version 2 1",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement reception\n"
+       "Version control\n"
+       "RIP version 2\n"
+       "RIP version 1\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1 and 2. */
+  ri->ri_receive = RI_RIP_VERSION_1_AND_2;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_rip_receive_version,
+       no_ip_rip_receive_version_cmd,
+       "no ip rip receive version",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement reception\n"
+       "Version control\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  ri->ri_receive = RI_RIP_UNSPEC;
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_rip_receive_version,
+       no_ip_rip_receive_version_num_cmd,
+       "no ip rip receive version (1|2)",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement reception\n"
+       "Version control\n"
+       "Version 1\n"
+       "Version 2\n")
+
+DEFUN (ip_rip_send_version,
+       ip_rip_send_version_cmd,
+       "ip rip send version (1|2)",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement transmission\n"
+       "Version control\n"
+       "RIP version 1\n"
+       "RIP version 2\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1. */
+  if (atoi (argv[0]) == 1)
+    {
+      ri->ri_send = RI_RIP_VERSION_1;
+      return CMD_SUCCESS;
+    }
+  if (atoi (argv[0]) == 2)
+    {
+      ri->ri_send = RI_RIP_VERSION_2;
+      return CMD_SUCCESS;
+    }
+  return CMD_WARNING;
+}
+
+DEFUN (ip_rip_send_version_1,
+       ip_rip_send_version_1_cmd,
+       "ip rip send version 1 2",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement transmission\n"
+       "Version control\n"
+       "RIP version 1\n"
+       "RIP version 2\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1 and 2. */
+  ri->ri_send = RI_RIP_VERSION_1_AND_2;
+  return CMD_SUCCESS;
+}
+
+DEFUN (ip_rip_send_version_2,
+       ip_rip_send_version_2_cmd,
+       "ip rip send version 2 1",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement transmission\n"
+       "Version control\n"
+       "RIP version 2\n"
+       "RIP version 1\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* Version 1 and 2. */
+  ri->ri_send = RI_RIP_VERSION_1_AND_2;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_rip_send_version,
+       no_ip_rip_send_version_cmd,
+       "no ip rip send version",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement transmission\n"
+       "Version control\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  ri->ri_send = RI_RIP_UNSPEC;
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_rip_send_version,
+       no_ip_rip_send_version_num_cmd,
+       "no ip rip send version (1|2)",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Advertisement transmission\n"
+       "Version control\n"
+       "Version 1\n"
+       "Version 2\n")
+
+DEFUN (ip_rip_authentication_mode,
+       ip_rip_authentication_mode_cmd,
+       "ip rip authentication mode (md5|text)",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication mode\n"
+       "Keyed message digest\n"
+       "Clear text authentication\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  if (strncmp ("md5", argv[0], strlen (argv[0])) == 0)
+    ri->auth_type = RIP_AUTH_MD5;
+  else if (strncmp ("text", argv[0], strlen (argv[0])) == 0)
+    ri->auth_type = RIP_AUTH_SIMPLE_PASSWORD;
+  else
+    {
+      vty_out (vty, "mode should be md5 or text%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_rip_authentication_mode,
+       no_ip_rip_authentication_mode_cmd,
+       "no ip rip authentication mode",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication mode\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  /* ri->auth_type = RIP_NO_AUTH; */
+  ri->auth_type = RIP_AUTH_SIMPLE_PASSWORD;
+
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_rip_authentication_mode,
+       no_ip_rip_authentication_mode_type_cmd,
+       "no ip rip authentication mode (md5|text)",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication mode\n"
+       "Keyed message digest\n"
+       "Clear text authentication\n")
+
+DEFUN (ip_rip_authentication_string,
+       ip_rip_authentication_string_cmd,
+       "ip rip authentication string LINE",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication string\n"
+       "Authentication string\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  if (strlen (argv[0]) > 16)
+    {
+      vty_out (vty, "%% RIPv2 authentication string must be shorter than 16%s",
+	       VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  if (ri->key_chain)
+    {
+      vty_out (vty, "%% key-chain configuration exists%s", VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  if (ri->auth_str)
+    free (ri->auth_str);
+
+  ri->auth_str = strdup (argv[0]);
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_rip_authentication_string,
+       no_ip_rip_authentication_string_cmd,
+       "no ip rip authentication string",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication string\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *)vty->index;
+  ri = ifp->info;
+
+  if (ri->auth_str)
+    free (ri->auth_str);
+
+  ri->auth_str = NULL;
+
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_rip_authentication_string,
+       no_ip_rip_authentication_string2_cmd,
+       "no ip rip authentication string LINE",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication string\n"
+       "Authentication string\n")
+
+DEFUN (ip_rip_authentication_key_chain,
+       ip_rip_authentication_key_chain_cmd,
+       "ip rip authentication key-chain LINE",
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication key-chain\n"
+       "name of key-chain\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *) vty->index;
+  ri = ifp->info;
+
+  if (ri->auth_str)
+    {
+      vty_out (vty, "%% authentication string configuration exists%s",
+	       VTY_NEWLINE);
+      return CMD_WARNING;
+    }
+
+  if (ri->key_chain)
+    free (ri->key_chain);
+
+  ri->key_chain = strdup (argv[0]);
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_rip_authentication_key_chain,
+       no_ip_rip_authentication_key_chain_cmd,
+       "no ip rip authentication key-chain",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication key-chain\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = (struct interface *) vty->index;
+  ri = ifp->info;
+
+  if (ri->key_chain)
+    free (ri->key_chain);
+
+  ri->key_chain = NULL;
+
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_rip_authentication_key_chain,
+       no_ip_rip_authentication_key_chain2_cmd,
+       "no ip rip authentication key-chain LINE",
+       NO_STR
+       IP_STR
+       "Routing Information Protocol\n"
+       "Authentication control\n"
+       "Authentication key-chain\n"
+       "name of key-chain\n")
+
+DEFUN (rip_split_horizon,
+       rip_split_horizon_cmd,
+       "ip split-horizon",
+       IP_STR
+       "Perform split horizon\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = vty->index;
+  ri = ifp->info;
+
+  ri->split_horizon = 1;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_rip_split_horizon,
+       no_rip_split_horizon_cmd,
+       "no ip split-horizon",
+       NO_STR
+       IP_STR
+       "Perform split horizon\n")
+{
+  struct interface *ifp;
+  struct rip_interface *ri;
+
+  ifp = vty->index;
+  ri = ifp->info;
+
+  ri->split_horizon = 0;
+  return CMD_SUCCESS;
+}
+
+DEFUN (rip_passive_interface,
+       rip_passive_interface_cmd,
+       "passive-interface IFNAME",
+       "Suppress routing updates on an interface\n"
+       "Interface name\n")
+{
+  return rip_passive_interface_set (vty, argv[0]);
+}
+
+DEFUN (no_rip_passive_interface,
+       no_rip_passive_interface_cmd,
+       "no passive-interface IFNAME",
+       NO_STR
+       "Suppress routing updates on an interface\n"
+       "Interface name\n")
+{
+  return rip_passive_interface_unset (vty, argv[0]);
+}
+
+/* Write rip configuration of each interface. */
+int
+rip_interface_config_write (struct vty *vty)
+{
+  listnode node;
+  struct interface *ifp;
+
+  for (node = listhead (iflist); node; nextnode (node))
+    {
+      struct rip_interface *ri;
+
+      ifp = getdata (node);
+      ri = ifp->info;
+
+      vty_out (vty, "interface %s%s", ifp->name,
+	       VTY_NEWLINE);
+
+      if (ifp->desc)
+	vty_out (vty, " description %s%s", ifp->desc,
+		 VTY_NEWLINE);
+
+      /* Split horizon. */
+      if (ri->split_horizon != ri->split_horizon_default)
+	{
+	  if (ri->split_horizon)
+	    vty_out (vty, " ip split-horizon%s", VTY_NEWLINE);
+	  else
+	    vty_out (vty, " no ip split-horizon%s", VTY_NEWLINE);
+	}
+
+      /* RIP version setting. */
+      if (ri->ri_send != RI_RIP_UNSPEC)
+	vty_out (vty, " ip rip send version %s%s",
+		 lookup (ri_version_msg, ri->ri_send),
+		 VTY_NEWLINE);
+
+      if (ri->ri_receive != RI_RIP_UNSPEC)
+	vty_out (vty, " ip rip receive version %s%s",
+		 lookup (ri_version_msg, ri->ri_receive),
+		 VTY_NEWLINE);
+
+      /* RIP authentication. */
+#if 0 
+      /* RIP_AUTH_SIMPLE_PASSWORD becomes default mode. */
+      if (ri->auth_type == RIP_AUTH_SIMPLE_PASSWORD)
+	vty_out (vty, " ip rip authentication mode text%s", VTY_NEWLINE);
+#endif /* 0 */
+      if (ri->auth_type == RIP_AUTH_MD5)
+	vty_out (vty, " ip rip authentication mode md5%s", VTY_NEWLINE);
+
+      if (ri->auth_str)
+	vty_out (vty, " ip rip authentication string %s%s",
+		 ri->auth_str, VTY_NEWLINE);
+
+      if (ri->key_chain)
+	vty_out (vty, " ip rip authentication key-chain %s%s",
+		 ri->key_chain, VTY_NEWLINE);
+
+      vty_out (vty, "!%s", VTY_NEWLINE);
+    }
+  return 0;
+}
+
+int
+config_write_rip_network (struct vty *vty, int config_mode)
+{
+  int i;
+  char *ifname;
+  struct route_node *node;
+
+  /* Network type RIP enable interface statement. */
+  for (node = route_top (rip_enable_network); node; node = route_next (node))
+    if (node->info)
+      vty_out (vty, "%s%s/%d%s", 
+	       config_mode ? " network " : "    ",
+	       inet_ntoa (node->p.u.prefix4),
+	       node->p.prefixlen,
+	       VTY_NEWLINE);
+
+  /* Interface name RIP enable statement. */
+  for (i = 0; i < vector_max (rip_enable_interface); i++)
+    if ((ifname = vector_slot (rip_enable_interface, i)) != NULL)
+      vty_out (vty, "%s%s%s",
+	       config_mode ? " network " : "    ",
+	       ifname,
+	       VTY_NEWLINE);
+
+  /* RIP neighbors listing. */
+  for (node = route_top (rip->neighbor); node; node = route_next (node))
+    if (node->info)
+      vty_out (vty, "%s%s%s", 
+	       config_mode ? " neighbor " : "    ",
+	       inet_ntoa (node->p.u.prefix4),
+	       VTY_NEWLINE);
+
+  /* RIP passive interface listing. */
+  if (config_mode)
+    for (i = 0; i < vector_max (Vrip_passive_interface); i++)
+      if ((ifname = vector_slot (Vrip_passive_interface, i)) != NULL)
+	vty_out (vty, " passive-interface %s%s", ifname, VTY_NEWLINE);
+
+  return 0;
+}
+
+struct cmd_node interface_node =
+{
+  INTERFACE_NODE,
+  "%s(config-if)# ",
+  1,
+};
+
+/* Called when interface structure allocated. */
+int
+rip_interface_new_hook (struct interface *ifp)
+{
+  ifp->info = rip_interface_new ();
+  return 0;
+}
+
+/* Called when interface structure deleted. */
+int
+rip_interface_delete_hook (struct interface *ifp)
+{
+  XFREE (MTYPE_RIP_INTERFACE, ifp->info);
+  return 0;
+}
+
+/* Allocate and initialize interface vector. */
+void
+rip_if_init ()
+{
+  /* Default initial size of interface vector. */
+  if_init();
+  if_add_hook (IF_NEW_HOOK, rip_interface_new_hook);
+  if_add_hook (IF_DELETE_HOOK, rip_interface_delete_hook);
+  
+  /* RIP network init. */
+  rip_enable_interface = vector_init (1);
+  rip_enable_network = route_table_init ();
+
+  /* RIP passive interface. */
+  Vrip_passive_interface = vector_init (1);
+
+  /* Install interface node. */
+  install_node (&interface_node, rip_interface_config_write);
+
+  /* Install commands. */
+  install_element (CONFIG_NODE, &interface_cmd);
+  install_default (INTERFACE_NODE);
+  install_element (INTERFACE_NODE, &interface_desc_cmd);
+  install_element (INTERFACE_NODE, &no_interface_desc_cmd);
+  install_element (RIP_NODE, &rip_network_cmd);
+  install_element (RIP_NODE, &no_rip_network_cmd);
+  install_element (RIP_NODE, &rip_neighbor_cmd);
+  install_element (RIP_NODE, &no_rip_neighbor_cmd);
+
+  install_element (RIP_NODE, &rip_passive_interface_cmd);
+  install_element (RIP_NODE, &no_rip_passive_interface_cmd);
+
+  install_element (INTERFACE_NODE, &ip_rip_send_version_cmd);
+  install_element (INTERFACE_NODE, &ip_rip_send_version_1_cmd);
+  install_element (INTERFACE_NODE, &ip_rip_send_version_2_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_send_version_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_send_version_num_cmd);
+
+  install_element (INTERFACE_NODE, &ip_rip_receive_version_cmd);
+  install_element (INTERFACE_NODE, &ip_rip_receive_version_1_cmd);
+  install_element (INTERFACE_NODE, &ip_rip_receive_version_2_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_receive_version_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_receive_version_num_cmd);
+
+  install_element (INTERFACE_NODE, &ip_rip_authentication_mode_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_mode_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_mode_type_cmd);
+
+  install_element (INTERFACE_NODE, &ip_rip_authentication_key_chain_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_key_chain_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_key_chain2_cmd);
+
+  install_element (INTERFACE_NODE, &ip_rip_authentication_string_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_string_cmd);
+  install_element (INTERFACE_NODE, &no_ip_rip_authentication_string2_cmd);
+
+  install_element (INTERFACE_NODE, &rip_split_horizon_cmd);
+  install_element (INTERFACE_NODE, &no_rip_split_horizon_cmd);
+}