FreeBSD/Linux Kernel Cross Reference
sys/modules/netgraph/frame_relay/ng_frame_relay.4

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    .\" Author: Archie Cobbs <archie@freebsd.org>
    .\"
    .\" $FreeBSD$
    .\" $Whistle: ng_frame_relay.8,v 1.4 1999/01/25 23:46:26 archie Exp $
    .\"
    .Dd January 19, 1999
    .Dt NG_FRAME_RELAY 4
    .Os FreeBSD
    .Sh NAME
    .Nm ng_frame_relay
    .Nd frame relay netgraph node type
    .Sh SYNOPSIS
    .Fd #include <netgraph/ng_frame_relay.h>
    .Sh DESCRIPTION
    The
    .Nm 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
    .Xr ng_lmi 4 ).
    .Pp
    The
    .Dv downstream
    hook should be connected to the synchronous line, i.e., the switch.
    Then hooks
    .Dv dlci0 ,
    .Dv dlci1 ,
    through
    .Dv dlci1023
    are available to connect to each of the DLCI channels.
    .Sh HOOKS
    This node type supports the following hooks:
    .Pp
    .Bl -tag -width foobar
    .It Dv downstream
    The connection to the synchronous line.
    .It Dv dlciX
    Here X is a decimal number from 0 to 1023. This hook corresponds
    to the DLCI X frame relay virtual channel.
    .El
    .Sh CONTROL MESSAGES
    This node type supports only the generic control messages.
    .Sh SHUTDOWN
    This node shuts down upon receipt of a
    .Dv NGM_SHUTDOWN
    control message, or when all hooks have been disconnected.
    .Sh 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
    .Nm
    node type ignores this restriction, and will always pass data received
    on a DLCI hook to
    .Dv downstream .
    Instead, it should query the LMI node first.
    .Sh SEE ALSO
    .Xr netgraph 4 ,
    .Xr ng_lmi 4 ,
    .Xr ngctl 8
    .Sh HISTORY
    The
    .Nm
    node type was implemented in
    .Fx 4.0 .
    .Sh AUTHORS
    .An Julian Elischer Aq julian@freebsd.org

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