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NG_LMI(4)	       FreeBSD Kernel Interfaces Manual		     NG_LMI(4)

NAME
     ng_lmi -- frame relay LMI protocol	netgraph node type

SYNOPSIS
     #include <sys/types.h>
     #include <netgraph/ng_lmi.h>

DESCRIPTION
     The lmi node type performs	the frame relay	LMI protocol.  It supports the
     ITU Annex A, ANSI Annex D,	and Group-of-four LMI types.  It also supports
     auto-detection of the LMI type.

     To	enable a specific LMI type, connect the	corresponding hook (annexA,
     annexD, or	group4)	to DLCI	0 or 1023 of a ng_frame_relay(4) node.	Typi-
     cally, Annex A and	Annex D	live on	DLCI 0 while Group-of-four lives on
     DLCI 1023.

     To	enable LMI type	auto-detection,	connect	the auto0 hook to DLCI 0 and
     the auto1023 hook to DLCI 1023.  The node will attempt to automatically
     determine which LMI type is running at the	switch,	and go into that mode.

     Only one fixed LMI	type, or auto-detection, can be	active at any given
     time.

     The NGM_LMI_GET_STATUS control message can	be used	at any time to query
     the current status	of the LMI protocol and	each DLCI channel.  This node
     also supports the NGM_TEXT_STATUS control message.

HOOKS
     This node type supports the following hooks:

     annexA	ITU Annex A LMI	hook.

     annexD	ANSI Annex D LMI hook.

     group4	Group-of-four LMI hook.

     auto0	Auto-detection hook for	DLCI 0.

     auto1023	Auto-detection hook for	DLCI 1023.

CONTROL	MESSAGES
     This node type supports the generic control messages, plus	the following:

     NGM_LMI_GET_STATUS
	  This command returns status information in a struct nglmistat:

	      #define NGM_LMI_STAT_ARYSIZE   (1024/8)

	      struct nglmistat {
		u_char	proto[12];    /* Active	proto (same as hook name) */
		u_char	hook[12];     /* Active	hook */
		u_char	fixed;	      /* If set	to fixed LMI mode */
		u_char	autod;	      /* If currently auto-detecting */
		u_char	seen[NGM_LMI_STAT_ARYSIZE];   /* bitmap	DLCIs seen */
		u_char	up[NGM_LMI_STAT_ARYSIZE];     /* bitmap	DLCIs up */
	      };

     NGM_TEXT_STATUS
	  This generic message returns is a human-readable version of the node
	  status.

SHUTDOWN
     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or
     when all hooks have been disconnected.

SEE ALSO
     netgraph(4), ng_frame_relay(4), ngctl(8)

     ANSI T1.617-1991 Annex D.

     ITU-T Q.933 Digital Subscriber Signaling System No. 1 - Signaling
     Specification for Frame Mode Basic	Call Control, Annex A.

HISTORY
     The ng_lmi	node type was implemented in FreeBSD 4.0.

AUTHORS
     Julian Elischer <julian@FreeBSD.org>

FreeBSD	9.3		       January 19, 1999			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | SHUTDOWN | SEE ALSO | HISTORY | AUTHORS

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