FreeBSD/Linux Kernel Cross Reference
sys/modules/netgraph/lmi/ng_lmi.4

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    .\" Author: Archie Cobbs <archie@freebsd.org>
    .\"
    .\" $FreeBSD$
    .\" $Whistle: ng_lmi.8,v 1.4 1999/01/25 23:46:27 archie Exp $
    .\"
    .Dd January 19, 1999
    .Dt NG_LMI 4
    .Os FreeBSD
    .Sh NAME
    .Nm ng_lmi
    .Nd frame relay LMI protocol netgraph node type
    .Sh SYNOPSIS
    .Fd #include <netgraph/ng_lmi.h>
    .Sh DESCRIPTION
    The
    .Nm 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.
    .Pp
    To enable a specific LMI type, connect the corresponding hook (
    .Dv annexA ,
    .Dv annexD ,
    or
    .Dv group4 ")"
    to DLCI 0 or 1023 of a
    .Xr ng_frame_relay 4
    node.
    Typically, Annex A and Annex D live on DLCI 0 while Group-of-four
    lives on DLCI 1023.
    .Pp
    To enable LMI type auto-detection, connect the
    .Dv auto0
    hook to DLCI 0 and the
    .Dv 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.
    .Pp
    Only one fixed LMI type, or auto-detection, can be active at any given time.
    .Pp
    The
    .Dv 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
    .Dv NGM_TEXT_STATUS
    control message.
    .Sh HOOKS
    This node type supports the following hooks:
    .Pp
    .Bl -tag -width foobarbaz
    .It Dv annexA
    ITU Annex A LMI hook.
    .It Dv annexD
    ANSI Annex D LMI hook.
    .It Dv group4
    Group-of-four LMI hook.
    .It Dv auto0
    Auto-detection hook for DLCI 0.
    .It Dv auto1023
    Auto-detection hook for DLCI 1023.
    .El
    .Sh CONTROL MESSAGES
    This node type supports the generic control messages, plus the following:
    .Bl -tag -width foo
    .It Dv NGM_LMI_GET_STATUS
    This command returns status information in a
    .Dv "struct nglmistat" :
   .Bd -literal -offset 4n
   #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 */
   };
   .Ed
   .It Dv NGM_TEXT_STATUS
   This generic message returns is a human-readable version of the node status.
   .El
   .Sh SHUTDOWN
   This node shuts down upon receipt of a
   .Dv NGM_SHUTDOWN
   control message, or when all hooks have been disconnected.
   .Sh SEE ALSO
   .Xr netgraph 4 ,
   .Xr ng_frame_relay 4 ,
   .Xr ngctl 8
   .Rs
   .%T "ANSI T1.617-1991 Annex D"
   .Re
   .Rs
   .%T "ITU-T Q.933 Digital Subscriber Signaling System No. 1 - Signaling Specification for Frame Mode Basic Call Control, Annex A"
   .Re
   .Sh HISTORY
   The
   .Nm
   node type was implemented in
   .Fx 4.0 .
   .Sh AUTHORS
   .An Julian Elischer Aq julian@freebsd.org

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