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.
