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_lmi(4)).
The downstream hook should be connected to the synchronous line, i.e., the switch. Then hooks dlci0, dlci1, 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.
SEE ALSO
netgraph(4), ng_lmi(4), ngctl(8)
HISTORY
The ng_frame_relay node type was implemented in FreeBSD 4.0.
AUTHORS
Julian Elischer <julian [AT] FreeBSD.org>
BUGS
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 ng_frame_relay 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.
BSD January 19, 1999 BSD