RE: 802.1Q or ISL

[Karen . Young]

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], 
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                    nobody@groups        Subject:     RE: 802.1Q or ISL                
                      
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                    09/08/2000                                                         
                      
                    01:18 PM                                                           
                      
                    Please                                                             
                      
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                    "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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