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@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.