94 lines
3.6 KiB
Groff
94 lines
3.6 KiB
Groff
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.\" Copyright (c) 1996-1999 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@whistle.com>
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.\"
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.\" $FreeBSD$
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.\" $Whistle: ng_frame_relay.8,v 1.4 1999/01/25 23:46:26 archie Exp $
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.\"
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.Dd January 19, 1999
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.Dt NG_FRAME_RELAY 8
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.Os FreeBSD 3
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.Sh NAME
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.Nm ng_frame_relay
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.Nd Frame relay netgraph node type
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.Sh SYNOPSIS
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.Fd #include <netgraph/ng_frame_relay.h>
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.Sh DESCRIPTION
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The
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.Nm frame_relay
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node type performs encapsulation, de-encapsulation, and multiplexing
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of packets using the frame relay protocol. It supports up to 1024 DLCI's.
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The LMI protocol is handled by a separate node type (see
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.Xr ng_lmi 8 ).
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.Pp
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The
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.Dv downstream
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hook should be connected to the synchronous line, i.e., the switch.
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Then hooks
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.Dv dlci0 ,
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.Dv dlci1 ,
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through
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.Dv dlci1023
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are available to connect to each of the DLCI channels.
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.Sh HOOKS
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This node type supports the following hooks:
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.Pp
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.Bl -tag -width foobar
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.It Dv downstream
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The connection to the synchronous line.
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.It Dv dlciX
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Here X is a decimal number from 0 to 1023. This hook corresponds
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to the DLCI X frame relay virtual channel.
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.El
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.Sh CONTROL MESSAGES
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This node type supports only the generic control messages.
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when all hooks have been disconnected.
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.Sh BUGS
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Technically, frames on DLCI X should not be transmitted to the switch
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until the LMI protocol entity on both ends has configured DLCI X as active.
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The
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.Nm frame_relay
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node type ignores this restriction, and will always pass data received
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on a DLCI hook to
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.Dv downstream .
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Instead, it should query the LMI node first.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_lmi 8 ,
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.Xr ngctl 8 .
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.Sh AUTHOR
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Julian Elisher <julian@whistle.com>
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