NAME    [Toc]    [Back]

     ng_frame_relay -- frame relay netgraph node type

SYNOPSIS    [Toc]    [Back]

     #include <netgraph/ng_frame_relay.h>

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     This node type supports only the generic control messages.

SHUTDOWN    [Toc]    [Back]

     This node shuts down upon receipt of a NGM_SHUTDOWN control message, or
     when all hooks have been disconnected.

BUGS    [Toc]    [Back]

     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.

SEE ALSO    [Toc]    [Back]

     netgraph(4), ng_lmi(4), ngctl(8)

HISTORY    [Toc]    [Back]

     The ng_frame_relay node type was implemented in FreeBSD 4.0.

AUTHORS    [Toc]    [Back]

     Julian Elischer <julian@FreeBSD.org>


FreeBSD 5.2.1		       January 19, 1999 		 FreeBSD 5.2.1