NAME
ng_frame_relay —
frame relay netgraph node
type
SYNOPSIS
#include
<netgraph/frame_relay/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
HISTORY
The ng_frame_relay node type was
implemented in FreeBSD 4.0.
AUTHORS
Julian Elischer <julian@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.