Yes, 8100 is the TPID for 802.1Q (the Cisco Press BCMSN book - page 103).
Have a great weekend,
Ole
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ole Drews Jensen
Systems Network Manager
CCNA, MCSE, MCP+I
RWR Enterprises, Inc.
[EMAIL PROTECTED]
http://www.insync.net/~drews/ccnp
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-----Original Message-----
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 08, 2000 5:44 PM
To: [EMAIL PROTECTED]
Subject: RE: 802.1Q or ISL
Looks like a typo maybe? 0800 would be IP!
I think the 802.1q TPID is 8100 though the only page I could find on this
topic is in German!
http://einstein.offis.uni-oldenburg.de/lehre/Protokolle/08/index.htm
Priscilla
At 02:33 PM 9/8/00, [EMAIL PROTECTED] wrote:
>You're right. I wasn't paying attention. Took a closer look at the format
>on my source and saw it was mislabeled.
>
>Here goes with the corrected info:
>
>2 octet TPID with a value of 08-00.
>2 octet TCI (Tag Control Information) consiting of
> 3 bits = user priority
> 1 bit = CFI (Canonical Format Indicator)
> 12 bits = VID (VLAN Identifier)
>
>if CFI = 1 then there will be an additional 4-32 octets for the Embeded RIF
>in the following format:
>
>2 octets length/type field
>2 octet RC (Route Control) field consisting of
> 3 bit = routing type
> 5 bit = length field
> 1 bit = direction bit
> 6 bit = LF (Largest Frame) field
> 1 bit = NCFI (Non-Canonical Format Indicator) - 0=MAC address info is
>in non-canonical format, 1=MAC address info is in canonical format.
>0-28 octets of route descriptors.
>
>http://www.protocols.com/pbook/lan2.htm#VLAN
>
>Karen E Young
>Network Engineer
>ELF Technologies, Inc
>[EMAIL PROTECTED]
>
>
>
>
>
>
> Ole
> Drews
>
> Jensen To:
> "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>,
> <OJensen@mail "Erick B."
> <[EMAIL PROTECTED]>
> 1.rwr.com> cc: [EMAIL PROTECTED],
> [EMAIL PROTECTED], Ole Drews
> Jensen <[EMAIL PROTECTED]>,
> [EMAIL PROTECTED]
> 09/08/2000 Subject: RE: 802.1Q or
> ISL
> 01:59
> PM
>
>
>
>
>
>
>
>
>How can 08-00 be only one byte ???
>
>Ole
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~
> Ole Drews Jensen
> Systems Network Manager
> CCNA, MCSE, MCP+I
> RWR Enterprises, Inc.
> [EMAIL PROTECTED]
>~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
>Sent: Friday, September 08, 2000 3:52 PM
>To: Erick B.
>Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED];
>[EMAIL PROTECTED]
>Subject: RE: 802.1Q or ISL
>
>
>
>Good question since the info I have shows the value to be 08-00 and is only
>1 byte....
>
>Maybe we should ask Howard to verify since he evidently has the IEEE
>Standards doc.
>
>Karen E Young
>Network Engineer
>ELF Technologies, Inc
>[EMAIL PROTECTED]
>
>
>
>
>
>
> "Erick B."
>
> <erickbe@yaho To: Dale Holmes
><[EMAIL PROTECTED]>,
> o.com> [EMAIL PROTECTED],
>[EMAIL PROTECTED], [EMAIL PROTECTED]
> Sent by: cc:
>
> nobody@groups Subject: RE: 802.1Q or ISL
>
> tudy.com
>
>
>
>
>
> 09/08/2000
>
> 01:18 PM
>
> Please
>
> respond to
>
> "Erick B."
>
>
>
>
>
>
>
>
>
>Trivia Q... where the TPID value of 0x8100 come from?
>
>--- Dale Holmes <[EMAIL PROTECTED]> wrote:
> > Yes, it's true, .1Q adds 4 bytes. The TPID and TCI
> > fields look like this:
> >
> > Tag Protocol Identifier (TPID) 2 bytes
> > - fixed value of 0x8100 16 bits
> > Tag Control Information (TCI) 2 bytes
> > - User Prioroty 3 bits
> > - Canonical FFormat Indicator (CFI) 1 bit
> > - VLAN Identifier 12 bits
>
>
>=====
>---------------------/-----------------------
> Erick B. / http://berk.dhs.org
> [EMAIL PROTECTED] / CCNP+Security+NetRanger
> / Nortel NCSE, CCIE Writ.
>-----------------/---------------------------
>
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________________________
Priscilla Oppenheimer
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