The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 .\" Copyright (c) 1996-1999 Whistle Communications, Inc.
    2 .\" All rights reserved.
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   23 .\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   24 .\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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   32 .\" 
   33 .\" Author: Archie Cobbs <archie@freebsd.org>
   34 .\"
   35 .\" $FreeBSD: stable/3/sys/modules/netgraph/frame_relay/ng_frame_relay.4 67528 2000-10-24 22:35:27Z julian $
   36 .\" $Whistle: ng_frame_relay.8,v 1.4 1999/01/25 23:46:26 archie Exp $
   37 .\"
   38 .Dd January 19, 1999
   39 .Dt NG_FRAME_RELAY 4
   40 .Os FreeBSD
   41 .Sh NAME
   42 .Nm ng_frame_relay
   43 .Nd frame relay netgraph node type
   44 .Sh SYNOPSIS
   45 .Fd #include <netgraph/ng_frame_relay.h>
   46 .Sh DESCRIPTION
   47 The
   48 .Nm frame_relay
   49 node type performs encapsulation, de-encapsulation, and multiplexing
   50 of packets using the frame relay protocol. It supports up to 1024 DLCI's.
   51 The LMI protocol is handled by a separate node type (see
   52 .Xr ng_lmi 4 ).
   53 .Pp
   54 The
   55 .Dv downstream
   56 hook should be connected to the synchronous line, i.e., the switch.
   57 Then hooks
   58 .Dv dlci0 ,
   59 .Dv dlci1 ,
   60 through
   61 .Dv dlci1023
   62 are available to connect to each of the DLCI channels.
   63 .Sh HOOKS
   64 This node type supports the following hooks:
   65 .Pp
   66 .Bl -tag -width foobar
   67 .It Dv downstream
   68 The connection to the synchronous line.
   69 .It Dv dlciX
   70 Here X is a decimal number from 0 to 1023. This hook corresponds
   71 to the DLCI X frame relay virtual channel.
   72 .El
   73 .Sh CONTROL MESSAGES
   74 This node type supports only the generic control messages.
   75 .Sh SHUTDOWN
   76 This node shuts down upon receipt of a
   77 .Dv NGM_SHUTDOWN
   78 control message, or when all hooks have been disconnected.
   79 .Sh BUGS
   80 Technically, frames on DLCI X should not be transmitted to the switch
   81 until the LMI protocol entity on both ends has configured DLCI X as active.
   82 The
   83 .Nm
   84 node type ignores this restriction, and will always pass data received
   85 on a DLCI hook to
   86 .Dv downstream .
   87 Instead, it should query the LMI node first.
   88 .Sh SEE ALSO
   89 .Xr netgraph 4 ,
   90 .Xr ng_lmi 4 ,
   91 .Xr ngctl 8
   92 .Sh HISTORY
   93 The
   94 .Nm
   95 node type was implemented in
   96 .Fx 4.0 .
   97 .Sh AUTHORS
   98 .An Julian Elischer Aq julian@freebsd.org

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