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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];   /* DLCIs ever seen */
		u_char	up[NGM_LMI_STAT_ARYSIZE];     /* DLCIs currently 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	10.1		       November	13, 2012		  FreeBSD 10.1

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

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