diff --git a/vtysh/vtysh.c b/vtysh/vtysh.c
new file mode 100644
index 0000000..965eb39
--- /dev/null
+++ b/vtysh/vtysh.c
@@ -0,0 +1,1803 @@
+/* Virtual terminal interface shell.
+ * Copyright (C) 2000 Kunihiro Ishiguro
+ *
+ * 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 <sys/un.h>
+#include <setjmp.h>
+#include <sys/wait.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#include "command.h"
+#include "memory.h"
+#include "vtysh/vtysh.h"
+
+/* Struct VTY. */
+struct vty *vty;
+
+/* VTY shell pager name. */
+char *vtysh_pager_name = NULL;
+
+/* VTY shell client structure. */
+struct vtysh_client
+{
+  int fd;
+} vtysh_client[VTYSH_INDEX_MAX];
+
+/* When '^Z' is received from vty, move down to the enable mode. */
+int
+vtysh_end ()
+{
+  switch (vty->node)
+    {
+    case VIEW_NODE:
+    case ENABLE_NODE:
+      /* Nothing to do. */
+      break;
+    default:
+      vty->node = ENABLE_NODE;
+      break;
+    }
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_end_all,
+	 vtysh_end_all_cmd,
+	 "end",
+	 "End current mode and down to previous mode\n")
+{
+  return vtysh_end (vty);
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_log_stdout,
+	 vtysh_log_stdout_cmd,
+	 "log stdout",
+	 "Logging control\n"
+	 "Logging goes to stdout\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 no_vtysh_log_stdout,
+	 no_vtysh_log_stdout_cmd,
+	 "no log stdout",
+	 NO_STR
+	 "Logging control\n"
+	 "Logging goes to stdout\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+       vtysh_log_file,
+       vtysh_log_file_cmd,
+       "log file FILENAME",
+       "Logging control\n"
+       "Logging to file\n"
+       "Logging filename\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+       no_vtysh_log_file,
+       no_vtysh_log_file_cmd,
+       "no log file [FILENAME]",
+       NO_STR
+       "Logging control\n"
+       "Cancel logging to file\n"
+       "Logging file name\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_log_syslog,
+	 vtysh_log_syslog_cmd,
+	 "log syslog",
+	 "Logging control\n"
+	 "Logging goes to syslog\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 no_vtysh_log_syslog,
+	 no_vtysh_log_syslog_cmd,
+	 "no log syslog",
+	 NO_STR
+	 "Logging control\n"
+	 "Cancel logging to syslog\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_log_trap,
+	 vtysh_log_trap_cmd,
+	 "log trap (emergencies|alerts|critical|errors|warnings|notifications|informational|debugging)",
+	 "Logging control\n"
+	 "Limit logging to specifed level\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 no_vtysh_log_trap,
+	 no_vtysh_log_trap_cmd,
+	 "no log trap",
+	 NO_STR
+	 "Logging control\n"
+	 "Permit all logging information\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_log_record_priority,
+	 vtysh_log_record_priority_cmd,
+	 "log record-priority",
+	 "Logging control\n"
+	 "Log the priority of the message within the message\n")
+{
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 no_vtysh_log_record_priority,
+	 no_vtysh_log_record_priority_cmd,
+	 "no log record-priority",
+	 NO_STR
+	 "Logging control\n"
+	 "Do not log the priority of the message within the message\n")
+{
+  return CMD_SUCCESS;
+}
+
+void
+vclient_close (struct vtysh_client *vclient)
+{
+  if (vclient->fd > 0)
+    close (vclient->fd);
+  vclient->fd = -1;
+}
+
+
+/* Following filled with debug code to trace a problematic condition
+   under load - it SHOULD handle it.
+*/
+#define ERR_WHERE_STRING "vtysh(): vtysh_client_config(): "
+int
+vtysh_client_config (struct vtysh_client *vclient, char *line)
+{
+  int ret;
+  char *buf;
+  size_t bufsz;
+  char *pbuf;
+  size_t left;
+  char *eoln;
+  int nbytes;
+  int i;
+  int readln;
+
+  if (vclient->fd < 0)
+    return CMD_SUCCESS;
+
+  ret = write (vclient->fd, line, strlen (line) + 1);
+  if (ret <= 0)
+    {
+      vclient_close (vclient);
+      return CMD_SUCCESS;
+    }
+	
+  /* Allow enough room for buffer to read more than a few pages from socket
+   */
+  bufsz = 5 * sysconf(_SC_PAGESIZE) + 1;
+  buf = XMALLOC(MTYPE_TMP, bufsz);
+  memset(buf, 0, bufsz);
+  pbuf = buf;
+
+  while (1)
+    {
+      if (pbuf >= ((buf + bufsz) -1))
+	{
+	  fprintf (stderr, ERR_WHERE_STRING \
+		   "warning - pbuf beyond buffer end.\n");
+	  return CMD_WARNING;
+	}
+
+      readln = (buf + bufsz) - pbuf - 1;
+      nbytes = read (vclient->fd, pbuf, readln);
+
+      if (nbytes <= 0)
+	{
+
+	  if (errno == EINTR)
+	    continue;
+
+	  fprintf(stderr, ERR_WHERE_STRING "(%u)", errno);
+	  perror("");
+
+	  if (errno == EAGAIN || errno == EIO)
+	    continue;
+
+	  vclient_close (vclient);
+	  XFREE(MTYPE_TMP, buf);
+	  return CMD_SUCCESS;
+	}
+
+      pbuf[nbytes] = '\0';
+
+      if (nbytes >= 4)
+	{
+	  i = nbytes - 4;
+	  if (pbuf[i] == '\0' && pbuf[i + 1] == '\0' && pbuf[i + 2] == '\0')
+	    {
+	      ret = pbuf[i + 3];
+	      break;
+	    }
+	}
+      pbuf += nbytes;
+
+      /* See if a line exists in buffer, if so parse and consume it, and
+	 reset read position */
+      if ((eoln = strrchr(buf, '\n')) == NULL)
+	continue;
+
+      if (eoln >= ((buf + bufsz) - 1))
+	{
+	  fprintf (stderr, ERR_WHERE_STRING \
+		   "warning - eoln beyond buffer end.\n");
+	}
+      vtysh_config_parse(buf);
+
+      eoln++;
+      left = (size_t)(buf + bufsz - eoln);
+      memmove(buf, eoln, left);
+      buf[bufsz-1] = '\0';
+      pbuf = buf + strlen(buf);
+    }
+
+  /* parse anything left in the buffer */
+  vtysh_config_parse (buf);
+
+  XFREE(MTYPE_TMP, buf);
+  return ret;
+}
+
+int
+vtysh_client_execute (struct vtysh_client *vclient, char *line, FILE *fp)
+{
+  int ret;
+  char buf[1001];
+  int nbytes;
+  int i;
+
+  if (vclient->fd < 0)
+    return CMD_SUCCESS;
+
+  ret = write (vclient->fd, line, strlen (line) + 1);
+  if (ret <= 0)
+    {
+      vclient_close (vclient);
+      return CMD_SUCCESS;
+    }
+	
+  while (1)
+    {
+      nbytes = read (vclient->fd, buf, sizeof(buf)-1);
+
+      if (nbytes <= 0 && errno != EINTR)
+	{
+	  vclient_close (vclient);
+	  return CMD_SUCCESS;
+	}
+
+      if (nbytes > 0)
+	{
+	  buf[nbytes] = '\0';
+	  fprintf (fp, "%s", buf);
+	  fflush (fp);
+
+	  if (nbytes >= 4)
+	    {
+	      i = nbytes - 4;
+	      if (buf[i] == '\0' && buf[i + 1] == '\0' && buf[i + 2] == '\0')
+		{
+		  ret = buf[i + 3];
+		  break;
+		}
+	    }
+	}
+    }
+  return ret;
+}
+
+void
+vtysh_exit_ripd_only ()
+{
+  vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIP], "exit", stdout);
+}
+
+
+void
+vtysh_pager_init ()
+{
+  vtysh_pager_name = getenv ("VTYSH_PAGER");
+  if (! vtysh_pager_name)
+    vtysh_pager_name = "more";
+}
+
+/* Command execution over the vty interface. */
+void
+vtysh_execute_func (char *line, int pager)
+{
+  int ret, cmd_stat;
+  vector vline;
+  struct cmd_element *cmd;
+  FILE *fp = NULL;
+
+  /* Split readline string up into the vector */
+  vline = cmd_make_strvec (line);
+
+  if (vline == NULL)
+    return;
+
+  ret = cmd_execute_command (vline, vty, &cmd);
+
+  cmd_free_strvec (vline);
+
+  switch (ret)
+    {
+    case CMD_WARNING:
+      if (vty->type == VTY_FILE)
+	printf ("Warning...\n");
+      break;
+    case CMD_ERR_AMBIGUOUS:
+      printf ("%% Ambiguous command.\n");
+      break;
+    case CMD_ERR_NO_MATCH:
+      printf ("%% Unknown command.\n");
+      break;
+    case CMD_ERR_INCOMPLETE:
+      printf ("%% Command incomplete.\n");
+      break;
+    case CMD_SUCCESS_DAEMON:
+      {
+	if (pager && vtysh_pager_name)
+	  {
+	    fp = popen ("more", "w");
+	    if (fp == NULL)
+	      {
+		perror ("popen");
+		exit (1);
+	      }
+	  }
+	else
+	  fp = stdout;
+
+	if (! strcmp(cmd->string,"configure terminal"))
+	  {
+	    cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_ZEBRA],
+					     line, fp);
+	    if (cmd_stat != CMD_WARNING)
+	      cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIP],
+					       line, fp);
+	    if (cmd_stat != CMD_WARNING)
+	      cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIPNG], line, fp);
+	    if (cmd_stat != CMD_WARNING)
+	      cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF],
+					       line, fp);
+	    if (cmd_stat != CMD_WARNING)
+	      cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF6], line, fp);
+	    if (cmd_stat != CMD_WARNING)
+	      cmd_stat = vtysh_client_execute (&vtysh_client[VTYSH_INDEX_BGP],
+					       line, fp);
+	    if (cmd_stat)
+	      {
+                line = "end";
+                vline = cmd_make_strvec (line);
+
+                if (vline == NULL)
+		  {
+		    if (pager && vtysh_pager_name && fp)
+		      {
+			if (pclose (fp) == -1)
+			  {
+			    perror ("pclose");
+			    exit (1);
+			  }
+			fp = NULL;
+		      }
+		    return;
+		  }
+
+                ret = cmd_execute_command (vline, vty, &cmd);
+                cmd_free_strvec (vline);
+                if (ret != CMD_SUCCESS_DAEMON)
+                  break;
+	      }
+	    else
+	      if (cmd->func)
+		{
+		  (*cmd->func) (cmd, vty, 0, NULL);
+		  break;
+                }
+	  }
+
+	if (cmd->daemon & VTYSH_ZEBRA)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_ZEBRA], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->daemon & VTYSH_RIPD)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIP], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->daemon & VTYSH_RIPNGD)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIPNG], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->daemon & VTYSH_OSPFD)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->daemon & VTYSH_OSPF6D)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF6], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->daemon & VTYSH_BGPD)
+	  if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_BGP], line, fp)
+	      != CMD_SUCCESS)
+	    break;
+	if (cmd->func)
+	  (*cmd->func) (cmd, vty, 0, NULL);
+      }
+    }
+  if (pager && vtysh_pager_name && fp)
+    {
+      if (pclose (fp) == -1)
+	{
+	  perror ("pclose");
+	  exit (1);
+	}
+      fp = NULL;
+    }
+}
+
+void
+vtysh_execute_no_pager (char *line)
+{
+  vtysh_execute_func (line, 0);
+}
+
+void
+vtysh_execute (char *line)
+{
+  vtysh_execute_func (line, 1);
+}
+
+/* Configration make from file. */
+int
+vtysh_config_from_file (struct vty *vty, FILE *fp)
+{
+  int ret;
+  vector vline;
+  struct cmd_element *cmd;
+
+  while (fgets (vty->buf, VTY_BUFSIZ, fp))
+    {
+      if (vty->buf[0] == '!' || vty->buf[1] == '#')
+	continue;
+
+      vline = cmd_make_strvec (vty->buf);
+
+      /* In case of comment line */
+      if (vline == NULL)
+	continue;
+
+      /* Execute configuration command : this is strict match */
+      ret = cmd_execute_command_strict (vline, vty, &cmd);
+
+      /* Try again with setting node to CONFIG_NODE */
+      if (ret != CMD_SUCCESS 
+	  && ret != CMD_SUCCESS_DAEMON
+	  && ret != CMD_WARNING)
+	{
+	  if (vty->node == KEYCHAIN_KEY_NODE)
+	    {
+	      vty->node = KEYCHAIN_NODE;
+	      vtysh_exit_ripd_only ();
+	      ret = cmd_execute_command_strict (vline, vty, &cmd);
+
+	      if (ret != CMD_SUCCESS 
+		  && ret != CMD_SUCCESS_DAEMON 
+		  && ret != CMD_WARNING)
+		{
+		  vtysh_exit_ripd_only ();
+		  vty->node = CONFIG_NODE;
+		  ret = cmd_execute_command_strict (vline, vty, &cmd);
+		}
+	    }
+	  else
+	    {
+	      vtysh_execute ("end");
+	      vtysh_execute ("configure terminal");
+	      vty->node = CONFIG_NODE;
+	      ret = cmd_execute_command_strict (vline, vty, &cmd);
+	    }
+	}	  
+
+      cmd_free_strvec (vline);
+
+      switch (ret)
+	{
+	case CMD_WARNING:
+	  if (vty->type == VTY_FILE)
+	    printf ("Warning...\n");
+	  break;
+	case CMD_ERR_AMBIGUOUS:
+	  printf ("%% Ambiguous command.\n");
+	  break;
+	case CMD_ERR_NO_MATCH:
+	  printf ("%% Unknown command: %s", vty->buf);
+	  break;
+	case CMD_ERR_INCOMPLETE:
+	  printf ("%% Command incomplete.\n");
+	  break;
+	case CMD_SUCCESS_DAEMON:
+	  {
+	    if (cmd->daemon & VTYSH_ZEBRA)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_ZEBRA],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->daemon & VTYSH_RIPD)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIP],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->daemon & VTYSH_RIPNGD)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_RIPNG],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->daemon & VTYSH_OSPFD)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->daemon & VTYSH_OSPF6D)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_OSPF6],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->daemon & VTYSH_BGPD)
+	      if (vtysh_client_execute (&vtysh_client[VTYSH_INDEX_BGP],
+					vty->buf, stdout) != CMD_SUCCESS)
+		break;
+	    if (cmd->func)
+	      (*cmd->func) (cmd, vty, 0, NULL);
+	  }
+	}
+    }
+  return CMD_SUCCESS;
+}
+
+/* We don't care about the point of the cursor when '?' is typed. */
+int
+vtysh_rl_describe ()
+{
+  int ret;
+  int i;
+  vector vline;
+  vector describe;
+  int width;
+  struct desc *desc;
+
+  vline = cmd_make_strvec (rl_line_buffer);
+
+  /* In case of '> ?'. */
+  if (vline == NULL)
+    {
+      vline = vector_init (1);
+      vector_set (vline, '\0');
+    }
+  else 
+    if (rl_end && isspace ((int) rl_line_buffer[rl_end - 1]))
+      vector_set (vline, '\0');
+
+  describe = cmd_describe_command (vline, vty, &ret);
+
+  printf ("\n");
+
+  /* Ambiguous and no match error. */
+  switch (ret)
+    {
+    case CMD_ERR_AMBIGUOUS:
+      cmd_free_strvec (vline);
+      printf ("%% Ambiguous command.\n");
+      rl_on_new_line ();
+      return 0;
+      break;
+    case CMD_ERR_NO_MATCH:
+      cmd_free_strvec (vline);
+      printf ("%% There is no matched command.\n");
+      rl_on_new_line ();
+      return 0;
+      break;
+    }  
+
+  /* Get width of command string. */
+  width = 0;
+  for (i = 0; i < vector_max (describe); i++)
+    if ((desc = vector_slot (describe, i)) != NULL)
+      {
+	int len;
+
+	if (desc->cmd[0] == '\0')
+	  continue;
+
+	len = strlen (desc->cmd);
+	if (desc->cmd[0] == '.')
+	  len--;
+
+	if (width < len)
+	  width = len;
+      }
+
+  for (i = 0; i < vector_max (describe); i++)
+    if ((desc = vector_slot (describe, i)) != NULL)
+      {
+	if (desc->cmd[0] == '\0')
+	  continue;
+
+	if (! desc->str)
+	  printf ("  %-s\n",
+		  desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd);
+	else
+	  printf ("  %-*s  %s\n",
+		  width,
+		  desc->cmd[0] == '.' ? desc->cmd + 1 : desc->cmd,
+		  desc->str);
+      }
+
+  cmd_free_strvec (vline);
+  vector_free (describe);
+
+  rl_on_new_line();
+
+  return 0;
+}
+
+/* result of cmd_complete_command() call will be stored here
+   and used in new_completion() in order to put the space in
+   correct places only */
+int complete_status;
+
+char *
+command_generator (char *text, int state)
+{
+  vector vline;
+  static char **matched = NULL;
+  static int index = 0;
+
+  /* First call. */
+  if (! state)
+    {
+      index = 0;
+
+      if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
+	return NULL;
+
+      vline = cmd_make_strvec (rl_line_buffer);
+      if (vline == NULL)
+	return NULL;
+
+      if (rl_end && isspace ((int) rl_line_buffer[rl_end - 1]))
+	vector_set (vline, '\0');
+
+      matched = cmd_complete_command (vline, vty, &complete_status);
+    }
+
+  if (matched && matched[index])
+    return matched[index++];
+
+  return NULL;
+}
+
+char **
+new_completion (char *text, int start, int end)
+{
+  char **matches;
+
+  matches = completion_matches (text, command_generator);
+
+  if (matches)
+    {
+      rl_point = rl_end;
+      if (complete_status == CMD_COMPLETE_FULL_MATCH)
+	rl_pending_input = ' ';
+    }
+
+  return matches;
+}
+
+char **
+vtysh_completion (char *text, int start, int end)
+{
+  int ret;
+  vector vline;
+  char **matched = NULL;
+
+  if (vty->node == AUTH_NODE || vty->node == AUTH_ENABLE_NODE)
+    return NULL;
+
+  vline = cmd_make_strvec (rl_line_buffer);
+  if (vline == NULL)
+    return NULL;
+
+  /* In case of 'help \t'. */
+  if (rl_end && isspace ((int) rl_line_buffer[rl_end - 1]))
+    vector_set (vline, '\0');
+
+  matched = cmd_complete_command (vline, vty, &ret);
+
+  cmd_free_strvec (vline);
+
+  return (char **) matched;
+}
+
+/* BGP node structure. */
+struct cmd_node bgp_node =
+{
+  BGP_NODE,
+  "%s(config-router)# ",
+};
+
+/* BGP node structure. */
+struct cmd_node rip_node =
+{
+  RIP_NODE,
+  "%s(config-router)# ",
+};
+
+struct cmd_node interface_node =
+{
+  INTERFACE_NODE,
+  "%s(config-if)# ",
+};
+
+DEFUNSH (VTYSH_BGPD,
+	 router_bgp,
+	 router_bgp_cmd,
+	 "router bgp <1-65535>",
+	 ROUTER_STR
+	 BGP_STR
+	 AS_STR)
+{
+  vty->node = BGP_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_vpnv4,
+	 address_family_vpnv4_cmd,
+	 "address-family vpnv4",
+	 "Enter Address Family command mode\n"
+	 "Address family\n")
+{
+  vty->node = BGP_VPNV4_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_vpnv4_unicast,
+	 address_family_vpnv4_unicast_cmd,
+	 "address-family vpnv4 unicast",
+	 "Enter Address Family command mode\n"
+	 "Address family\n"
+	 "Address Family Modifier\n")
+{
+  vty->node = BGP_VPNV4_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_ipv4_unicast,
+	 address_family_ipv4_unicast_cmd,
+	 "address-family ipv4 unicast",
+	 "Enter Address Family command mode\n"
+	 "Address family\n"
+	 "Address Family Modifier\n")
+{
+  vty->node = BGP_IPV4_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_ipv4_multicast,
+	 address_family_ipv4_multicast_cmd,
+	 "address-family ipv4 multicast",
+	 "Enter Address Family command mode\n"
+	 "Address family\n"
+	 "Address Family Modifier\n")
+{
+  vty->node = BGP_IPV4M_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_ipv6,
+	 address_family_ipv6_cmd,
+	 "address-family ipv6",
+	 "Enter Address Family command mode\n"
+	 "Address family\n")
+{
+  vty->node = BGP_IPV6_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_BGPD,
+	 address_family_ipv6_unicast,
+	 address_family_ipv6_unicast_cmd,
+	 "address-family ipv6 unicast",
+	 "Enter Address Family command mode\n"
+	 "Address family\n"
+	 "Address Family Modifier\n")
+{
+  vty->node = BGP_IPV6_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_RIPD,
+	 key_chain,
+	 key_chain_cmd,
+	 "key chain WORD",
+	 "Authentication key management\n"
+	 "Key-chain management\n"
+	 "Key-chain name\n")
+{
+  vty->node = KEYCHAIN_NODE;
+  return CMD_SUCCESS;
+}	 
+
+DEFUNSH (VTYSH_RIPD,
+	 key,
+	 key_cmd,
+	 "key <0-2147483647>",
+	 "Configure a key\n"
+	 "Key identifier number\n")
+{
+  vty->node = KEYCHAIN_KEY_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_RIPD,
+	 router_rip,
+	 router_rip_cmd,
+	 "router rip",
+	 ROUTER_STR
+	 "RIP")
+{
+  vty->node = RIP_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_RIPNGD,
+	 router_ripng,
+	 router_ripng_cmd,
+	 "router ripng",
+	 ROUTER_STR
+	 "RIPng")
+{
+  vty->node = RIPNG_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_OSPFD,
+	 router_ospf,
+	 router_ospf_cmd,
+	 "router ospf",
+	 "Enable a routing process\n"
+	 "Start OSPF configuration\n")
+{
+  vty->node = OSPF_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_OSPF6D,
+	 router_ospf6,
+	 router_ospf6_cmd,
+	 "router ospf6",
+	 OSPF6_ROUTER_STR
+	 OSPF6_STR)
+{
+  vty->node = OSPF6_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_RMAP,
+	 route_map,
+	 route_map_cmd,
+	 "route-map WORD (deny|permit) <1-65535>",
+	 "Create route-map or enter route-map command mode\n"
+	 "Route map tag\n"
+	 "Route map denies set operations\n"
+	 "Route map permits set operations\n"
+	 "Sequence to insert to/delete from existing route-map entry\n")
+{
+  vty->node = RMAP_NODE;
+  return CMD_SUCCESS;
+}
+
+/* Enable command */
+DEFUNSH (VTYSH_ALL,
+	 vtysh_enable, 
+	 vtysh_enable_cmd,
+	 "enable",
+	 "Turn on privileged mode command\n")
+{
+  vty->node = ENABLE_NODE;
+  return CMD_SUCCESS;
+}
+
+/* Disable command */
+DEFUNSH (VTYSH_ALL,
+	 vtysh_disable, 
+	 vtysh_disable_cmd,
+	 "disable",
+	 "Turn off privileged mode command\n")
+{
+  if (vty->node == ENABLE_NODE)
+    vty->node = VIEW_NODE;
+  return CMD_SUCCESS;
+}
+
+/* Configration from terminal */
+DEFUNSH (VTYSH_ALL,
+	 vtysh_config_terminal,
+	 vtysh_config_terminal_cmd,
+	 "configure terminal",
+	 "Configuration from vty interface\n"
+	 "Configuration terminal\n")
+{
+  vty->node = CONFIG_NODE;
+  return CMD_SUCCESS;
+}
+
+int
+vtysh_exit (struct vty *vty)
+{
+  switch (vty->node)
+    {
+    case VIEW_NODE:
+    case ENABLE_NODE:
+      exit (0);
+      break;
+    case CONFIG_NODE:
+      vty->node = ENABLE_NODE;
+      break;
+    case INTERFACE_NODE:
+    case ZEBRA_NODE:
+    case BGP_NODE:
+    case RIP_NODE:
+    case RIPNG_NODE:
+    case OSPF_NODE:
+    case OSPF6_NODE:
+    case MASC_NODE:
+    case RMAP_NODE:
+    case VTY_NODE:
+    case KEYCHAIN_NODE:
+      vty->node = CONFIG_NODE;
+      break;
+    case BGP_VPNV4_NODE:
+    case BGP_IPV4_NODE:
+    case BGP_IPV4M_NODE:
+    case BGP_IPV6_NODE:
+      vty->node = BGP_NODE;
+      break;
+    case KEYCHAIN_KEY_NODE:
+      vty->node = KEYCHAIN_NODE;
+      break;
+    default:
+      break;
+    }
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ALL,
+	 vtysh_exit_all,
+	 vtysh_exit_all_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_all,
+       vtysh_quit_all_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_BGPD,
+	 exit_address_family,
+	 exit_address_family_cmd,
+	 "exit-address-family",
+	 "Exit from Address Family configuration mode\n")
+{
+  if (vty->node == BGP_IPV4_NODE
+      || vty->node == BGP_IPV4M_NODE
+      || vty->node == BGP_VPNV4_NODE
+      || vty->node == BGP_IPV6_NODE)
+    vty->node = BGP_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFUNSH (VTYSH_ZEBRA,
+	 vtysh_exit_zebra,
+	 vtysh_exit_zebra_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_zebra,
+       vtysh_quit_zebra_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_RIPD,
+	 vtysh_exit_ripd,
+	 vtysh_exit_ripd_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_ripd,
+       vtysh_quit_ripd_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_RMAP,
+	 vtysh_exit_rmap,
+	 vtysh_exit_rmap_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_rmap,
+       vtysh_quit_rmap_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_BGPD,
+	 vtysh_exit_bgpd,
+	 vtysh_exit_bgpd_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_bgpd,
+       vtysh_quit_bgpd_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_OSPFD,
+	 vtysh_exit_ospfd,
+	 vtysh_exit_ospfd_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_ospfd,
+       vtysh_quit_ospfd_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUNSH (VTYSH_ZEBRA|VTYSH_RIPD|VTYSH_OSPFD,
+	 vtysh_interface,
+	 vtysh_interface_cmd,
+	 "interface IFNAME",
+	 "Select an interface to configure\n"
+	 "Interface's name\n")
+{
+  vty->node = INTERFACE_NODE;
+  return CMD_SUCCESS;
+}
+
+DEFSH (VTYSH_RIPD|VTYSH_BGPD,
+       set_ip_nexthop_cmd,
+       "set ip next-hop A.B.C.D",
+       SET_STR
+       IP_STR
+       "Next hop address\n"
+       "IP address of next hop\n")
+
+DEFSH (VTYSH_RMAP,
+       set_metric_cmd,
+       "set metric <0-4294967295>",
+       SET_STR
+       "Metric value for destination routing protocol\n"
+       "Metric value\n")
+
+DEFUNSH (VTYSH_ZEBRA|VTYSH_RIPD|VTYSH_OSPFD,
+	 vtysh_exit_interface,
+	 vtysh_exit_interface_cmd,
+	 "exit",
+	 "Exit current mode and down to previous mode\n")
+{
+  return vtysh_exit (vty);
+}
+
+ALIAS (vtysh_exit_interface,
+       vtysh_quit_interface_cmd,
+       "quit",
+       "Exit current mode and down to previous mode\n")
+
+DEFUN (vtysh_write_terminal,
+       vtysh_write_terminal_cmd,
+       "write terminal",
+       "Write running configuration to memory, network, or terminal\n"
+       "Write to terminal\n")
+{
+  int ret;
+  char line[] = "write terminal\n";
+  FILE *fp = NULL;
+
+  if (vtysh_pager_name)
+    {
+      fp = popen ("more", "w");
+      if (fp == NULL)
+	{
+	  perror ("popen");
+	  exit (1);
+	}
+    }
+  else
+    fp = stdout;
+
+  vty_out (vty, "Building configuration...%s", VTY_NEWLINE);
+  vty_out (vty, "%sCurrent configuration:%s", VTY_NEWLINE,
+	   VTY_NEWLINE);
+
+  vtysh_config_write (fp);
+
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_ZEBRA], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_RIP], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_RIPNG], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_OSPF], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_OSPF6], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_BGP], line);
+
+  vtysh_config_dump (fp);
+
+  if (vtysh_pager_name && fp)
+    {
+      fflush (fp);
+      if (pclose (fp) == -1)
+	{
+	  perror ("pclose");
+	  exit (1);
+	}
+      fp = NULL;
+    }
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_write_memory,
+       vtysh_write_memory_cmd,
+       "write memory",
+       "Write running configuration to memory, network, or terminal\n"
+       "Write configuration to the file (same as write file)\n")
+{
+  int ret;
+  mode_t old_umask;
+  char line[] = "write terminal\n";
+  FILE *fp;
+  char *integrate_sav = NULL;
+
+  /* config files have 0600 perms... */ 
+  old_umask = umask (0077);
+
+  integrate_sav = malloc (strlen (integrate_default) 
+			    + strlen (CONF_BACKUP_EXT) + 1);
+  strcpy (integrate_sav, integrate_default);
+  strcat (integrate_sav, CONF_BACKUP_EXT);
+
+
+  printf ("Building Configuration...\n");
+
+  /* Move current configuration file to backup config file */
+  unlink (integrate_sav);
+  rename (integrate_default, integrate_sav);
+
+  fp = fopen (integrate_default, "w");
+  if (fp == NULL)
+    {
+      printf ("%% Can't open configuration file %s.\n", integrate_default);
+      umask (old_umask);
+      return CMD_SUCCESS;
+    }
+  else
+    printf ("[OK]\n");
+	  
+
+  vtysh_config_write (fp);
+
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_ZEBRA], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_RIP], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_RIPNG], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_OSPF], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_OSPF6], line);
+  ret = vtysh_client_config (&vtysh_client[VTYSH_INDEX_BGP], line);
+
+  vtysh_config_dump (fp);
+
+  fclose (fp);
+
+  umask (old_umask);
+  return CMD_SUCCESS;
+}
+
+ALIAS (vtysh_write_memory,
+       vtysh_copy_runningconfig_startupconfig_cmd,
+       "copy running-config startup-config",  
+       "Copy from one file to another\n"
+       "Copy from current system configuration\n"
+       "Copy to startup configuration\n")
+
+ALIAS (vtysh_write_memory,
+       vtysh_write_file_cmd,
+       "write file",
+       "Write running configuration to memory, network, or terminal\n"
+       "Write configuration to the file (same as write memory)\n")
+
+ALIAS (vtysh_write_terminal,
+       vtysh_show_running_config_cmd,
+       "show running-config",
+       SHOW_STR
+       "Current operating configuration\n")
+
+/* Execute command in child process. */
+int
+execute_command (char *command, int argc, char *arg1, char *arg2)
+{
+  int ret;
+  pid_t pid;
+  int status;
+
+  /* Call fork(). */
+  pid = fork ();
+
+  if (pid < 0)
+    {
+      /* Failure of fork(). */
+      fprintf (stderr, "Can't fork: %s\n", strerror (errno));
+      exit (1);
+    }
+  else if (pid == 0)
+    {
+      /* This is child process. */
+      switch (argc)
+	{
+	case 0:
+	  ret = execlp (command, command, NULL);
+	  break;
+	case 1:
+	  ret = execlp (command, command, arg1, NULL);
+	  break;
+	case 2:
+	  ret = execlp (command, command, arg1, arg2, NULL);
+	  break;
+	}
+
+      /* When execlp suceed, this part is not executed. */
+      fprintf (stderr, "Can't execute %s: %s\n", command, strerror (errno));
+      exit (1);
+    }
+  else
+    {
+      /* This is parent. */
+      execute_flag = 1;
+      ret = wait4 (pid, &status, 0, NULL);
+      execute_flag = 0;
+    }
+  return 0;
+}
+
+DEFUN (vtysh_ping,
+       vtysh_ping_cmd,
+       "ping WORD",
+       "send echo messages\n"
+       "Ping destination address or hostname\n")
+{
+  execute_command ("ping", 1, argv[0], NULL);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_traceroute,
+       vtysh_traceroute_cmd,
+       "traceroute WORD",
+       "Trace route to destination\n"
+       "Trace route to destination address or hostname\n")
+{
+  execute_command ("traceroute", 1, argv[0], NULL);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_telnet,
+       vtysh_telnet_cmd,
+       "telnet WORD",
+       "Open a telnet connection\n"
+       "IP address or hostname of a remote system\n")
+{
+  execute_command ("telnet", 1, argv[0], NULL);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_telnet_port,
+       vtysh_telnet_port_cmd,
+       "telnet WORD PORT",
+       "Open a telnet connection\n"
+       "IP address or hostname of a remote system\n"
+       "TCP Port number\n")
+{
+  execute_command ("telnet", 2, argv[0], argv[1]);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_start_shell,
+       vtysh_start_shell_cmd,
+       "start-shell",
+       "Start UNIX shell\n")
+{
+  execute_command ("sh", 0, NULL, NULL);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_start_bash,
+       vtysh_start_bash_cmd,
+       "start-shell bash",
+       "Start UNIX shell\n"
+       "Start bash\n")
+{
+  execute_command ("bash", 0, NULL, NULL);
+  return CMD_SUCCESS;
+}
+
+DEFUN (vtysh_start_zsh,
+       vtysh_start_zsh_cmd,
+       "start-shell zsh",
+       "Start UNIX shell\n"
+       "Start Z shell\n")
+{
+  execute_command ("zsh", 0, NULL, NULL);
+  return CMD_SUCCESS;
+}
+
+/* Route map node structure. */
+struct cmd_node rmap_node =
+{
+  RMAP_NODE,
+  "%s(config-route-map)# "
+};
+
+/* Zebra node structure. */
+struct cmd_node zebra_node =
+{
+  ZEBRA_NODE,
+  "%s(config-router)# "
+};
+
+struct cmd_node bgp_vpnv4_node =
+{
+  BGP_VPNV4_NODE,
+  "%s(config-router-af)# "
+};
+
+struct cmd_node bgp_ipv4_node =
+{
+  BGP_IPV4_NODE,
+  "%s(config-router-af)# "
+};
+
+struct cmd_node bgp_ipv4m_node =
+{
+  BGP_IPV4M_NODE,
+  "%s(config-router-af)# "
+};
+
+struct cmd_node bgp_ipv6_node =
+{
+  BGP_IPV6_NODE,
+  "%s(config-router-af)# "
+};
+
+struct cmd_node ospf_node =
+{
+  OSPF_NODE,
+  "%s(config-router)# "
+};
+
+/* RIPng node structure. */
+struct cmd_node ripng_node =
+{
+  RIPNG_NODE,
+  "%s(config-router)# "
+};
+
+/* OSPF6 node structure. */
+struct cmd_node ospf6_node =
+{
+  OSPF6_NODE,
+  "%s(config-ospf6)# "
+};
+
+struct cmd_node keychain_node =
+{
+  KEYCHAIN_NODE,
+  "%s(config-keychain)# "
+};
+
+struct cmd_node keychain_key_node =
+{
+  KEYCHAIN_KEY_NODE,
+  "%s(config-keychain-key)# "
+};
+
+void
+vtysh_install_default (enum node_type node)
+{
+  install_element (node, &config_list_cmd);
+}
+
+/* Making connection to protocol daemon. */
+int
+vtysh_connect (struct vtysh_client *vclient, char *path)
+{
+  int ret;
+  int sock, len;
+  struct sockaddr_un addr;
+  struct stat s_stat;
+  uid_t euid;
+  gid_t egid;
+
+  memset (vclient, 0, sizeof (struct vtysh_client));
+  vclient->fd = -1;
+
+  /* Stat socket to see if we have permission to access it. */
+  euid = geteuid();
+  egid = getegid();
+  ret = stat (path, &s_stat);
+  if (ret < 0 && errno != ENOENT)
+    {
+      fprintf  (stderr, "vtysh_connect(%s): stat = %s\n", 
+		path, strerror(errno)); 
+      exit(1);
+    }
+  
+  if (ret >= 0)
+    {
+      if (! S_ISSOCK(s_stat.st_mode))
+	{
+	  fprintf (stderr, "vtysh_connect(%s): Not a socket\n",
+		   path);
+	  exit (1);
+	}
+      
+      if (euid != s_stat.st_uid 
+	  || !(s_stat.st_mode & S_IWUSR)
+	  || !(s_stat.st_mode & S_IRUSR))
+	{
+	  fprintf (stderr, "vtysh_connect(%s): No permission to access socket\n",
+		   path);
+	  exit (1);
+	}
+    }
+
+  sock = socket (AF_UNIX, SOCK_STREAM, 0);
+  if (sock < 0)
+    {
+#ifdef DEBUG
+      fprintf(stderr, "vtysh_connect(%s): socket = %s\n", path, strerror(errno));
+#endif /* DEBUG */
+      return -1;
+    }
+
+  memset (&addr, 0, sizeof (struct sockaddr_un));
+  addr.sun_family = AF_UNIX;
+  strncpy (addr.sun_path, path, strlen (path));
+#ifdef HAVE_SUN_LEN
+  len = addr.sun_len = SUN_LEN(&addr);
+#else
+  len = sizeof (addr.sun_family) + strlen (addr.sun_path);
+#endif /* HAVE_SUN_LEN */
+
+  ret = connect (sock, (struct sockaddr *) &addr, len);
+  if (ret < 0)
+    {
+#ifdef DEBUG
+      fprintf(stderr, "vtysh_connect(%s): connect = %s\n", path, strerror(errno));
+#endif /* DEBUG */
+      close (sock);
+      return -1;
+    }
+  vclient->fd = sock;
+
+  return 0;
+}
+
+void
+vtysh_connect_all()
+{
+  /* Clear each daemons client structure. */
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_ZEBRA], ZEBRA_PATH);
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_RIP], RIP_PATH);
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_RIPNG], RIPNG_PATH);
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_OSPF], OSPF_PATH);
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_OSPF6], OSPF6_PATH);
+  vtysh_connect (&vtysh_client[VTYSH_INDEX_BGP], BGP_PATH);
+}
+
+
+/* To disable readline's filename completion */
+int
+vtysh_completion_entry_fucntion (int ignore, int invoking_key)
+{
+  return 0;
+}
+
+void
+vtysh_readline_init ()
+{
+  /* readline related settings. */
+  rl_bind_key ('?', vtysh_rl_describe);
+  rl_completion_entry_function = vtysh_completion_entry_fucntion;
+  rl_attempted_completion_function = (CPPFunction *)new_completion;
+  /* do not append space after completion. It will be appended
+     in new_completion() function explicitly */
+  rl_completion_append_character = '\0';
+}
+
+char *
+vtysh_prompt ()
+{
+  struct utsname names;
+  static char buf[100];
+  const char*hostname;
+  extern struct host host;
+
+  hostname = host.name;
+
+  if (!hostname)
+    {
+      uname (&names);
+      hostname = names.nodename;
+    }
+
+  snprintf (buf, sizeof buf, cmd_prompt (vty->node), hostname);
+
+  return buf;
+}
+
+void
+vtysh_init_vty ()
+{
+  /* Make vty structure. */
+  vty = vty_new ();
+  vty->type = VTY_SHELL;
+  vty->node = VIEW_NODE;
+
+  /* Initialize commands. */
+  cmd_init (0);
+
+  /* Install nodes. */
+  install_node (&bgp_node, NULL);
+  install_node (&rip_node, NULL);
+  install_node (&interface_node, NULL);
+  install_node (&rmap_node, NULL);
+  install_node (&zebra_node, NULL);
+  install_node (&bgp_vpnv4_node, NULL);
+  install_node (&bgp_ipv4_node, NULL);
+  install_node (&bgp_ipv4m_node, NULL);
+/* #ifdef HAVE_IPV6 */
+  install_node (&bgp_ipv6_node, NULL);
+/* #endif */
+  install_node (&ospf_node, NULL);
+/* #ifdef HAVE_IPV6 */
+  install_node (&ripng_node, NULL);
+  install_node (&ospf6_node, NULL);
+/* #endif */
+  install_node (&keychain_node, NULL);
+  install_node (&keychain_key_node, NULL);
+
+  vtysh_install_default (VIEW_NODE);
+  vtysh_install_default (ENABLE_NODE);
+  vtysh_install_default (CONFIG_NODE);
+  vtysh_install_default (BGP_NODE);
+  vtysh_install_default (RIP_NODE);
+  vtysh_install_default (INTERFACE_NODE);
+  vtysh_install_default (RMAP_NODE);
+  vtysh_install_default (ZEBRA_NODE);
+  vtysh_install_default (BGP_VPNV4_NODE);
+  vtysh_install_default (BGP_IPV4_NODE);
+  vtysh_install_default (BGP_IPV4M_NODE);
+  vtysh_install_default (BGP_IPV6_NODE);
+  vtysh_install_default (OSPF_NODE);
+  vtysh_install_default (RIPNG_NODE);
+  vtysh_install_default (OSPF6_NODE);
+  vtysh_install_default (KEYCHAIN_NODE);
+  vtysh_install_default (KEYCHAIN_KEY_NODE);
+
+  install_element (VIEW_NODE, &vtysh_enable_cmd);
+  install_element (ENABLE_NODE, &vtysh_config_terminal_cmd);
+  install_element (ENABLE_NODE, &vtysh_disable_cmd);
+
+  /* "exit" command. */
+  install_element (VIEW_NODE, &vtysh_exit_all_cmd);
+  install_element (VIEW_NODE, &vtysh_quit_all_cmd);
+  install_element (CONFIG_NODE, &vtysh_exit_all_cmd);
+  /* install_element (CONFIG_NODE, &vtysh_quit_all_cmd); */
+  install_element (ENABLE_NODE, &vtysh_exit_all_cmd);
+  install_element (ENABLE_NODE, &vtysh_quit_all_cmd);
+  install_element (RIP_NODE, &vtysh_exit_ripd_cmd);
+  install_element (RIP_NODE, &vtysh_quit_ripd_cmd);
+  install_element (OSPF_NODE, &vtysh_exit_ospfd_cmd);
+  install_element (OSPF_NODE, &vtysh_quit_ospfd_cmd);
+  install_element (BGP_NODE, &vtysh_exit_bgpd_cmd);
+  install_element (BGP_NODE, &vtysh_quit_bgpd_cmd);
+  install_element (BGP_VPNV4_NODE, &vtysh_exit_bgpd_cmd);
+  install_element (BGP_VPNV4_NODE, &vtysh_quit_bgpd_cmd);
+  install_element (BGP_IPV4_NODE, &vtysh_exit_bgpd_cmd);
+  install_element (BGP_IPV4_NODE, &vtysh_quit_bgpd_cmd);
+  install_element (BGP_IPV4M_NODE, &vtysh_exit_bgpd_cmd);
+  install_element (BGP_IPV4M_NODE, &vtysh_quit_bgpd_cmd);
+  install_element (BGP_IPV6_NODE, &vtysh_exit_bgpd_cmd);
+  install_element (BGP_IPV6_NODE, &vtysh_quit_bgpd_cmd);
+  install_element (KEYCHAIN_NODE, &vtysh_exit_ripd_cmd);
+  install_element (KEYCHAIN_NODE, &vtysh_quit_ripd_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &vtysh_exit_ripd_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &vtysh_quit_ripd_cmd);
+  install_element (RMAP_NODE, &vtysh_exit_rmap_cmd);
+  install_element (RMAP_NODE, &vtysh_quit_rmap_cmd);
+
+  /* "end" command. */
+  install_element (CONFIG_NODE, &vtysh_end_all_cmd);
+  install_element (ENABLE_NODE, &vtysh_end_all_cmd);
+  install_element (RIP_NODE, &vtysh_end_all_cmd);
+  install_element (RIPNG_NODE, &vtysh_end_all_cmd);
+  install_element (OSPF_NODE, &vtysh_end_all_cmd);
+  install_element (OSPF6_NODE, &vtysh_end_all_cmd);
+  install_element (BGP_NODE, &vtysh_end_all_cmd);
+  install_element (BGP_IPV4_NODE, &vtysh_end_all_cmd);
+  install_element (BGP_IPV4M_NODE, &vtysh_end_all_cmd);
+  install_element (BGP_VPNV4_NODE, &vtysh_end_all_cmd);
+  install_element (BGP_IPV6_NODE, &vtysh_end_all_cmd);
+  install_element (KEYCHAIN_NODE, &vtysh_end_all_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &vtysh_end_all_cmd);
+  install_element (RMAP_NODE, &vtysh_end_all_cmd);
+
+  install_element (INTERFACE_NODE, &vtysh_end_all_cmd);
+  install_element (INTERFACE_NODE, &vtysh_exit_interface_cmd);
+  install_element (INTERFACE_NODE, &vtysh_quit_interface_cmd);
+  install_element (CONFIG_NODE, &router_rip_cmd);
+#ifdef HAVE_IPV6
+  install_element (CONFIG_NODE, &router_ripng_cmd);
+#endif
+  install_element (CONFIG_NODE, &router_ospf_cmd);
+#ifdef HAVE_IPV6
+  install_element (CONFIG_NODE, &router_ospf6_cmd);
+#endif
+  install_element (CONFIG_NODE, &router_bgp_cmd);
+  install_element (BGP_NODE, &address_family_vpnv4_cmd);
+  install_element (BGP_NODE, &address_family_vpnv4_unicast_cmd);
+  install_element (BGP_NODE, &address_family_ipv4_unicast_cmd);
+  install_element (BGP_NODE, &address_family_ipv4_multicast_cmd);
+#ifdef HAVE_IPV6
+  install_element (BGP_NODE, &address_family_ipv6_cmd);
+  install_element (BGP_NODE, &address_family_ipv6_unicast_cmd);
+#endif
+  install_element (BGP_VPNV4_NODE, &exit_address_family_cmd);
+  install_element (BGP_IPV4_NODE, &exit_address_family_cmd);
+  install_element (BGP_IPV4M_NODE, &exit_address_family_cmd);
+  install_element (BGP_IPV6_NODE, &exit_address_family_cmd);
+  install_element (CONFIG_NODE, &key_chain_cmd);
+  install_element (CONFIG_NODE, &route_map_cmd);
+  install_element (KEYCHAIN_NODE, &key_cmd);
+  install_element (KEYCHAIN_NODE, &key_chain_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &key_chain_cmd);
+  install_element (CONFIG_NODE, &vtysh_interface_cmd);
+  install_element (ENABLE_NODE, &vtysh_show_running_config_cmd);
+  install_element (ENABLE_NODE, &vtysh_copy_runningconfig_startupconfig_cmd);
+  install_element (ENABLE_NODE, &vtysh_write_file_cmd);
+
+  /* write terminal command */
+  install_element (ENABLE_NODE, &vtysh_write_terminal_cmd);
+  install_element (CONFIG_NODE, &vtysh_write_terminal_cmd);
+  install_element (BGP_NODE, &vtysh_write_terminal_cmd);
+  install_element (BGP_VPNV4_NODE, &vtysh_write_terminal_cmd);
+  install_element (BGP_IPV4_NODE, &vtysh_write_terminal_cmd);
+  install_element (BGP_IPV4M_NODE, &vtysh_write_terminal_cmd);
+  install_element (BGP_IPV6_NODE, &vtysh_write_terminal_cmd);
+  install_element (RIP_NODE, &vtysh_write_terminal_cmd);
+  install_element (RIPNG_NODE, &vtysh_write_terminal_cmd);
+  install_element (OSPF_NODE, &vtysh_write_terminal_cmd);
+  install_element (OSPF6_NODE, &vtysh_write_terminal_cmd);
+  install_element (INTERFACE_NODE, &vtysh_write_terminal_cmd);
+  install_element (RMAP_NODE, &vtysh_write_terminal_cmd);
+  install_element (KEYCHAIN_NODE, &vtysh_write_terminal_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &vtysh_write_terminal_cmd);
+
+  /* write memory command */
+  install_element (ENABLE_NODE, &vtysh_write_memory_cmd);
+  install_element (CONFIG_NODE, &vtysh_write_memory_cmd);
+  install_element (BGP_NODE, &vtysh_write_memory_cmd);
+  install_element (BGP_VPNV4_NODE, &vtysh_write_memory_cmd);
+  install_element (BGP_IPV4_NODE, &vtysh_write_memory_cmd);
+  install_element (BGP_IPV4M_NODE, &vtysh_write_memory_cmd);
+  install_element (BGP_IPV6_NODE, &vtysh_write_memory_cmd);
+  install_element (RIP_NODE, &vtysh_write_memory_cmd);
+  install_element (RIPNG_NODE, &vtysh_write_memory_cmd);
+  install_element (OSPF_NODE, &vtysh_write_memory_cmd);
+  install_element (OSPF6_NODE, &vtysh_write_memory_cmd);
+  install_element (INTERFACE_NODE, &vtysh_write_memory_cmd);
+  install_element (RMAP_NODE, &vtysh_write_memory_cmd);
+  install_element (KEYCHAIN_NODE, &vtysh_write_memory_cmd);
+  install_element (KEYCHAIN_KEY_NODE, &vtysh_write_memory_cmd);
+
+  install_element (VIEW_NODE, &vtysh_ping_cmd);
+  install_element (VIEW_NODE, &vtysh_traceroute_cmd);
+  install_element (VIEW_NODE, &vtysh_telnet_cmd);
+  install_element (VIEW_NODE, &vtysh_telnet_port_cmd);
+  install_element (ENABLE_NODE, &vtysh_ping_cmd);
+  install_element (ENABLE_NODE, &vtysh_traceroute_cmd);
+  install_element (ENABLE_NODE, &vtysh_telnet_cmd);
+  install_element (ENABLE_NODE, &vtysh_telnet_port_cmd);
+  install_element (ENABLE_NODE, &vtysh_start_shell_cmd);
+  install_element (ENABLE_NODE, &vtysh_start_bash_cmd);
+  install_element (ENABLE_NODE, &vtysh_start_zsh_cmd);
+
+  install_element (RMAP_NODE, &set_metric_cmd);
+  install_element (RMAP_NODE, &set_ip_nexthop_cmd);
+
+  install_element (CONFIG_NODE, &vtysh_log_stdout_cmd);
+  install_element (CONFIG_NODE, &no_vtysh_log_stdout_cmd);
+  install_element (CONFIG_NODE, &vtysh_log_file_cmd);
+  install_element (CONFIG_NODE, &no_vtysh_log_file_cmd);
+  install_element (CONFIG_NODE, &vtysh_log_syslog_cmd);
+  install_element (CONFIG_NODE, &no_vtysh_log_syslog_cmd);
+  install_element (CONFIG_NODE, &vtysh_log_trap_cmd);
+  install_element (CONFIG_NODE, &no_vtysh_log_trap_cmd);
+  install_element (CONFIG_NODE, &vtysh_log_record_priority_cmd);
+  install_element (CONFIG_NODE, &no_vtysh_log_record_priority_cmd);
+}