Интерактивная система просмотра системных руководств (man-ов)
ng_frame_relay (4)
>> ng_frame_relay (4) ( FreeBSD man: Специальные файлы /dev/* )
BSD mandoc
NAME
ng_frame_relay
- frame relay netgraph node type
SYNOPSIS
#include <netgraph/ng_frame_relay.h>
DESCRIPTION
The
frame_relay
node type performs encapsulation, de-encapsulation, and multiplexing
of packets using the frame relay protocol.
It supports up to 1024 DLCI's.
The LMI protocol is handled by a separate node type (see
ng_lmi4).
The
downstream
hook should be connected to the synchronous line, i.e., the switch.
Then hooks
dlci0dlci1
through
dlci1023
are available to connect to each of the DLCI channels.
HOOKS
This node type supports the following hooks:
downstream
The connection to the synchronous line.
dlciX
Here X is a decimal number from 0 to 1023.
This hook corresponds
to the DLCI X frame relay virtual channel.
CONTROL MESSAGES
This node type supports only the generic control messages.
SHUTDOWN
This node shuts down upon receipt of a
NGM_SHUTDOWN
control message, or when all hooks have been disconnected.
Technically, frames on DLCI X should not be transmitted to the switch
until the LMI protocol entity on both ends has configured DLCI X as active.
The
node type ignores this restriction, and will always pass data received
on a DLCI hook to
downstream
Instead, it should query the LMI node first.
