SYNOPSIS
In sys/types.h In netgraph/ng_lmi.hDESCRIPTION
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_relay4 node. Typically, 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.