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NG_LMI(4) 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 deter- mine 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 Specifi- cation 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 ports 15.quarterly November 13, 2012 NG_LMI(4)
NAME | SYNOPSIS | DESCRIPTION | HOOKS | CONTROL MESSAGES | SHUTDOWN | SEE ALSO | HISTORY | AUTHORS
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