Initial revision
diff --git a/isisd/isis_csm.h b/isisd/isis_csm.h
new file mode 100644
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+++ b/isisd/isis_csm.h
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+/*
+ * IS-IS Rout(e)ing protocol - isis_csm.h
+ * IS-IS circuit state machine
+ *
+ * Copyright (C) 2001,2002 Sampo Saaristo
+ * Tampere University of Technology
+ * Institute of Communications Engineering
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public Licenseas published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#ifndef _ZEBRA_ISIS_CSM_H
+#define _ZEBRA_ISIS_CSM_H
+
+/*
+ * Circuit states
+ */
+#define C_STATE_NA 0
+#define C_STATE_INIT 1 /* Connected to interface */
+#define C_STATE_CONF 2 /* Configured for ISIS */
+#define C_STATE_UP 3 /* CONN | CONF */
+
+/*
+ * Circuit events
+ */
+#define ISIS_ENABLE 1
+#define IF_UP_FROM_Z 2
+#define ISIS_DISABLE 3
+#define IF_DOWN_FROM_Z 4
+
+struct isis_circuit *isis_csm_state_change (int event,
+ struct isis_circuit *circuit,
+ void *arg);
+
+#endif /* _ZEBRA_ISIS_CSM_H */