NAME
ng_lmi — frame relay LMI protocol netgraph node typeSYNOPSIS
#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. 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: NGM_TEXT_STATUS- This generic message returns is a human-readable version of the node status.
SHUTDOWN
This node shuts down upon receipt of aNGM_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 Specification for Frame Mode Basic Call Control, Annex A.HISTORY
The ng_lmi node type was implemented in FreeBSD 4.0.AUTHORS
Julian Elischer <[email protected]>| November 13, 2012 | Debian |