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.

Debian                                          January 19, 1999                               NG_FRAME_RELAY(4)