139 lines
4.6 KiB
Groff
139 lines
4.6 KiB
Groff
.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_lmi.8,v 1.4 1999/01/25 23:46:27 archie Exp $
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.\"
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.Dd January 19, 1999
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.Dt NG_LMI 4
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.Os
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.Sh NAME
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.Nm ng_lmi
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.Nd frame relay LMI protocol netgraph node type
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.Sh SYNOPSIS
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.In sys/types.h
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.In netgraph/ng_lmi.h
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.Sh DESCRIPTION
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The
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.Nm lmi
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node type performs the frame relay LMI protocol.
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It supports
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the ITU Annex A, ANSI Annex D, and Group-of-four LMI types.
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It also supports auto-detection of the LMI type.
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.Pp
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To enable a specific LMI type, connect the corresponding hook
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.Dv ( annexA ,
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.Dv annexD ,
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or
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.Dv group4 ")"
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to DLCI 0 or 1023 of a
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.Xr ng_frame_relay 4
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node.
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Typically, Annex A and Annex D live on DLCI 0 while Group-of-four
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lives on DLCI 1023.
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.Pp
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To enable LMI type auto-detection, connect the
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.Dv auto0
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hook to DLCI 0 and the
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.Dv auto1023
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hook to DLCI 1023.
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The node will attempt to automatically determine
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which LMI type is running at the switch, and go into that mode.
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.Pp
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Only one fixed LMI type, or auto-detection, can be active at any given time.
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.Pp
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The
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.Dv NGM_LMI_GET_STATUS
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control message can be used at any time to query the current status
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of the LMI protocol and each DLCI channel.
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This node also supports the
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.Dv NGM_TEXT_STATUS
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control message.
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.Sh HOOKS
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This node type supports the following hooks:
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.Bl -tag -width foobarbaz
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.It Dv annexA
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ITU Annex A LMI hook.
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.It Dv annexD
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ANSI Annex D LMI hook.
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.It Dv group4
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Group-of-four LMI hook.
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.It Dv auto0
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Auto-detection hook for DLCI 0.
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.It Dv auto1023
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Auto-detection hook for DLCI 1023.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_LMI_GET_STATUS
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This command returns status information in a
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.Dv "struct nglmistat" :
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.Bd -literal -offset 4n
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#define NGM_LMI_STAT_ARYSIZE (1024/8)
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struct nglmistat {
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u_char proto[12]; /* Active proto (same as hook name) */
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u_char hook[12]; /* Active hook */
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u_char fixed; /* If set to fixed LMI mode */
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u_char autod; /* If currently auto-detecting */
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u_char seen[NGM_LMI_STAT_ARYSIZE]; /* bitmap DLCIs seen */
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u_char up[NGM_LMI_STAT_ARYSIZE]; /* bitmap DLCIs up */
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};
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.Ed
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.It Dv NGM_TEXT_STATUS
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This generic message returns is a human-readable version of the node status.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_frame_relay 4 ,
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.Xr ngctl 8
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.Rs
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.%T "ANSI T1.617-1991 Annex D"
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.Re
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.Rs
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.%T "ITU-T Q.933 Digital Subscriber Signaling System No. 1 - Signaling Specification for Frame Mode Basic Call Control, Annex A"
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.Re
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.Sh HISTORY
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The
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.Nm
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node type was implemented in
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.Fx 4.0 .
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.Sh AUTHORS
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.An Julian Elischer Aq julian@FreeBSD.org
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