[Couldn't post this to the newsgroup, hence sending it to you directly]
"Gopinath Pulyankote" <[EMAIL PROTECTED]> wrote in message news:...
How about this ? This says 10-bit VLAN ID !
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/113ed_cr/s
witch_c/xcisl.htm
Frame Tagging in ISL
With ISL, an Ethernet frame is encapsulated with a header that transports
VLAN IDs between switches and routers. A 26-byte header that contains a
10-bit VLAN ID is prepended to the Ethernet frame.
--Gopinath
> ""Brant Stevens"" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> >
> > Information on ISL header... taken from
> > http://www.cisco.com/warp/public/741/4.html
> >
> > VLAN - Virtual LAN ID
> > The VLAN field is the virtual LAN ID of the packet. It is a 15-bit value
> > that is used to distinguish frames on different VLANs. This field is
often
> > referred to as the "color" of the packet.
> >
> > Information on 802.1Q packet... taken from
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121
> > t/121t3/dtbridge.htm#xtocid114535
> >
> > The tag is stored in the following two octets and it contains 3 bits of
> user
> > priority, 1 bit of Canonical Format Identifier (CFI) and 12 bits of VLAN
> ID
> > (VID). The 3 bits of user priority are used by the standard 802.1p; and
> the
> > CFI is used for compatibility reasons between Ethernet type networks and
> > Token Ring type networks. The VID is the identification of the VLAN,
which
> > is basically used by the standard 802.1Q and, being on 12 bits, it
allows
> > the identification of 4096 VLANs.
> >
> >
> > Brant I. Stevens
> > Internetwork Solutions Engineer
> > Thrupoint, Inc.
> > 545 Fifth Avenue, 14th Floor
> > New York, NY. 10017
> > 646-562-6540
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Gopinath Pulyankote
> > Sent: Wednesday, February 28, 2001 1:49 PM
> > To: [EMAIL PROTECTED]
> > Subject: BCMSN: VLAN ID How many bits? 10 or 15 ??
> >
> >
> > Hi all,
> > The Cisco Press book BCMSN by Karen Webb says the VLAN ID is 15
bits,
> > but I read somewhere else its 10 bits.
> > Which is correct ??
> > TIA
> > --Gopinath
> >
> >
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>
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