124 lines
3.7 KiB
Groff
124 lines
3.7 KiB
Groff
.\" $NetBSD: vlan.4,v 1.8 2000/12/20 02:16:33 jhawk Exp $
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.\"
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.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of Zembu Labs, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 27, 2000
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.Dt VLAN 4
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.Os
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.Sh NAME
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.Nm vlan
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.Nd 802.1Q Virtual LAN network device
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.Sh SYNOPSIS
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.Cd "pseudo-device vlan"
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.Sh DESCRIPTION
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The
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.Nm
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interface provides support for 802.1Q Virtual LANs. This allows the
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trunking of more than one network on a single network interface.
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This is particularly useful on routers or on hosts which must be
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connected to many different networks.
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.Pp
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To use a
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.Nm vlan
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interface, the administrator must first create the interface and then
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specify the VLAN tag and physical interface associated with the VLAN.
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This can be done by using the
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.Xr ifconfig 8
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.Sq create ,
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.Sq vlan ,
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and
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.Sq vlanif
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subcommands, or
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.Dv SIOCSIFCREATE
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and
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.Dv SIOCSIFVLAN
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ioctls.
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.Pp
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To be compatible with others 802.1Q devices, the
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.Nm
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interface shall support a 1500 bytes MTU, which means that the parent
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interface will have to handle frames that are 4 bytes larger than the
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ethernet MTU. Drivers supporting this incerased MTU are:
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.Bl -dash -compact indent
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.It
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drivers using the dp8390 core (
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.Xr ec 4 ,
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.Xr we 4 ,
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.Xr ne 4 ,
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possibly others)
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.It
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.Xr ex 4
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.It
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.Xr fxp 4
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.It
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.Xr le 4
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.It
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.Xr tulip 4
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.It
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.Xr epic 4
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.It
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.Xr ti 4
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.El
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.Nm
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can be used with devices not supporting the 802.1Q MTU, but then the MTU of the
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.Nm
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interface will be 4 bytes too small and will not interoperate properly with
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other 802.1Q devices, unless the MTU of the remote end is also lowered.
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.Sh SEE ALSO
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Nx 1.6 .
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.Sh BUGS
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The
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.Nm
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interfaces do not currently inherit changes made to the physical
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interfaces's MTU.
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.Sh AUTHOR
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The
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.Nm
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driver was integrated by
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.An Andrew Doran
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.Aq ad@netbsd.org
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and
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.An Jason R. Thorpe
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.Aq thorpej@zembu.com .
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It was derived from a VLAN implementation that appeared in
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.Fx
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and
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.Ox .
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