diff --git a/zebra/debug.c b/zebra/debug.c
new file mode 100644
index 0000000..fc99623
--- /dev/null
+++ b/zebra/debug.c
@@ -0,0 +1,272 @@
+/*
+ * Zebra debug related function
+ * Copyright (C) 1999 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 "command.h"
+#include "debug.h"
+
+/* For debug statement. */
+unsigned long zebra_debug_event;
+unsigned long zebra_debug_packet;
+unsigned long zebra_debug_kernel;
+
+DEFUN (show_debugging_zebra,
+       show_debugging_zebra_cmd,
+       "show debugging zebra",
+       SHOW_STR
+       "Zebra configuration\n"
+       "Debugging information\n")
+{
+  vty_out (vty, "Zebra debugging status:%s", VTY_NEWLINE);
+
+  if (IS_ZEBRA_DEBUG_EVENT)
+    vty_out (vty, "  Zebra event debugging is on%s", VTY_NEWLINE);
+
+  if (IS_ZEBRA_DEBUG_PACKET)
+    {
+      if (IS_ZEBRA_DEBUG_SEND && IS_ZEBRA_DEBUG_RECV)
+	{
+	  vty_out (vty, "  Zebra packet%s debugging is on%s",
+		   IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		   VTY_NEWLINE);
+	}
+      else
+	{
+	  if (IS_ZEBRA_DEBUG_SEND)
+	    vty_out (vty, "  Zebra packet send%s debugging is on%s",
+		     IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		     VTY_NEWLINE);
+	  else
+	    vty_out (vty, "  Zebra packet receive%s debugging is on%s",
+		     IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		     VTY_NEWLINE);
+	}
+    }
+
+  if (IS_ZEBRA_DEBUG_KERNEL)
+    vty_out (vty, "  Zebra kernel debugging is on%s", VTY_NEWLINE);
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (debug_zebra_events,
+       debug_zebra_events_cmd,
+       "debug zebra events",
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra events\n")
+{
+  zebra_debug_event = ZEBRA_DEBUG_EVENT;
+  return CMD_WARNING;
+}
+
+DEFUN (debug_zebra_packet,
+       debug_zebra_packet_cmd,
+       "debug zebra packet",
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra packet\n")
+{
+  zebra_debug_packet = ZEBRA_DEBUG_PACKET;
+  zebra_debug_packet |= ZEBRA_DEBUG_SEND;
+  zebra_debug_packet |= ZEBRA_DEBUG_RECV;
+  return CMD_SUCCESS;
+}
+
+DEFUN (debug_zebra_packet_direct,
+       debug_zebra_packet_direct_cmd,
+       "debug zebra packet (recv|send)",
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra packet\n"
+       "Debug option set for receive packet\n"
+       "Debug option set for send packet\n")
+{
+  zebra_debug_packet = ZEBRA_DEBUG_PACKET;
+  if (strncmp ("send", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet |= ZEBRA_DEBUG_SEND;
+  if (strncmp ("recv", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet |= ZEBRA_DEBUG_RECV;
+  zebra_debug_packet &= ~ZEBRA_DEBUG_DETAIL;
+  return CMD_SUCCESS;
+}
+
+DEFUN (debug_zebra_packet_detail,
+       debug_zebra_packet_detail_cmd,
+       "debug zebra packet (recv|send) detail",
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra packet\n"
+       "Debug option set for receive packet\n"
+       "Debug option set for send packet\n"
+       "Debug option set detaied information\n")
+{
+  zebra_debug_packet = ZEBRA_DEBUG_PACKET;
+  if (strncmp ("send", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet |= ZEBRA_DEBUG_SEND;
+  if (strncmp ("recv", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet |= ZEBRA_DEBUG_RECV;
+  zebra_debug_packet |= ZEBRA_DEBUG_DETAIL;
+  return CMD_SUCCESS;
+}
+
+DEFUN (debug_zebra_kernel,
+       debug_zebra_kernel_cmd,
+       "debug zebra kernel",
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra between kernel interface\n")
+{
+  zebra_debug_kernel = ZEBRA_DEBUG_KERNEL;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_zebra_events,
+       no_debug_zebra_events_cmd,
+       "no debug zebra events",
+       NO_STR
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra events\n")
+{
+  zebra_debug_event = 0;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_zebra_packet,
+       no_debug_zebra_packet_cmd,
+       "no debug zebra packet",
+       NO_STR
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra packet\n")
+{
+  zebra_debug_packet = 0;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_zebra_packet_direct,
+       no_debug_zebra_packet_direct_cmd,
+       "no debug zebra packet (recv|send)",
+       NO_STR
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra packet\n"
+       "Debug option set for receive packet\n"
+       "Debug option set for send packet\n")
+{
+  if (strncmp ("send", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet &= ~ZEBRA_DEBUG_SEND;
+  if (strncmp ("recv", argv[0], strlen (argv[0])) == 0)
+    zebra_debug_packet &= ~ZEBRA_DEBUG_RECV;
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_zebra_kernel,
+       no_debug_zebra_kernel_cmd,
+       "no debug zebra kernel",
+       NO_STR
+       DEBUG_STR
+       "Zebra configuration\n"
+       "Debug option set for zebra between kernel interface\n")
+{
+  zebra_debug_kernel = 0;
+  return CMD_SUCCESS;
+}
+
+/* Debug node. */
+struct cmd_node debug_node =
+{
+  DEBUG_NODE,
+  "",				/* Debug node has no interface. */
+  1
+};
+
+int
+config_write_debug (struct vty *vty)
+{
+  int write = 0;
+
+  if (IS_ZEBRA_DEBUG_EVENT)
+    {
+      vty_out (vty, "debug zebra events%s", VTY_NEWLINE);
+      write++;
+    }
+  if (IS_ZEBRA_DEBUG_PACKET)
+    {
+      if (IS_ZEBRA_DEBUG_SEND && IS_ZEBRA_DEBUG_RECV)
+	{
+	  vty_out (vty, "debug zebra packet%s%s",
+		   IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		   VTY_NEWLINE);
+	  write++;
+	}
+      else
+	{
+	  if (IS_ZEBRA_DEBUG_SEND)
+	    vty_out (vty, "debug zebra packet send%s%s",
+		     IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		     VTY_NEWLINE);
+	  else
+	    vty_out (vty, "debug zebra packet recv%s%s",
+		     IS_ZEBRA_DEBUG_DETAIL ? " detail" : "",
+		     VTY_NEWLINE);
+	  write++;
+	}
+    }
+  if (IS_ZEBRA_DEBUG_KERNEL)
+    {
+      vty_out (vty, "debug zebra kernel%s", VTY_NEWLINE);
+      write++;
+    }
+  return write;
+}
+
+void
+zebra_debug_init ()
+{
+  zebra_debug_event = 0;
+  zebra_debug_packet = 0;
+
+  install_node (&debug_node, config_write_debug);
+
+  install_element (VIEW_NODE, &show_debugging_zebra_cmd);
+
+  install_element (ENABLE_NODE, &show_debugging_zebra_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_events_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_packet_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_packet_direct_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_packet_detail_cmd);
+  install_element (ENABLE_NODE, &debug_zebra_kernel_cmd);
+  install_element (ENABLE_NODE, &no_debug_zebra_events_cmd);
+  install_element (ENABLE_NODE, &no_debug_zebra_packet_cmd);
+  install_element (ENABLE_NODE, &no_debug_zebra_kernel_cmd);
+
+  install_element (CONFIG_NODE, &debug_zebra_events_cmd);
+  install_element (CONFIG_NODE, &debug_zebra_packet_cmd);
+  install_element (CONFIG_NODE, &debug_zebra_packet_direct_cmd);
+  install_element (CONFIG_NODE, &debug_zebra_packet_detail_cmd);
+  install_element (CONFIG_NODE, &debug_zebra_kernel_cmd);
+  install_element (CONFIG_NODE, &no_debug_zebra_events_cmd);
+  install_element (CONFIG_NODE, &no_debug_zebra_packet_cmd);
+  install_element (CONFIG_NODE, &no_debug_zebra_kernel_cmd);
+}