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Author: Archie Cobbs <archie@whistle.com>
$FreeBSD: head/share/man/man4/ng_lmi.4 52419 1999-10-21 09:06:11Z julian $
$Whistle: ng_lmi.8,v 1.4 1999/01/25 23:46:27 archie Exp $
.Dd January 19, 1999 .Dt NG_LMI 8 .Os FreeBSD 3 .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.
p 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 8 node. Typically, Annex A and Annex D live on DLCI 0 while Group-of-four lives on DLCI 1023.
p 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.
p Only one fixed LMI type, or auto-detection, can be active at any given time.
p 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:
p l -tag -width foobarbaz t Dv annexA ITU Annex A LMI hook. t Dv annexD ANSI Annex D LMI hook. t Dv group4 Group-of-four LMI hook. t Dv auto0 Auto-detection hook for DLCI 0. t Dv auto1023 Auto-detection hook for DLCI 1023. .El .Sh CONTROL MESSAGES This node type supports the generic control messages, plus the following: l -tag -width foo t Dv NGM_LMI_GET_STATUS This command returns status information in a .Dv "struct nglmistat" : d -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 t 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 8 , .Xr ngctl 8 . .Rs .%T "ANSI T1.617-1991 Annex D" .Re .Rs .%T "ITU-T Q.933 Digital Subscriber Signalling System No. 1 - Signalling Specification for Frame Mode Basic Call Control, Annex A" .Re .Sh AUTHOR Julian Elisher <julian@whistle.com>