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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