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.