Hi!

We've a quite big network and I want to assign VLANs dynamically based on the 
MAC address, as backend I want to uses a SQL database.  My problem now is that 
the VLAN IDs on different access switch stacks (used Layer2 switches) are 
different for the same network area,  e.g. on switch1  vlan 123 is used for 
printers and on switch2 vlan124 is used for printers. The reason for this is 
the Layer3 switch (which we use as a distribution switch of the building) needs 
to be part of all VLANs and we can't use one VLAN for a building as the subnet 
would get too big.  A other requirement is that a device can roam between 
different access switches(=floors and buildings), so the VLAN the switch port 
should get set needs to be different, based on which switch is making the 
request.

This problem is easily solvable if I can use VLAN names in 
Tunnel-Private-Group-ID tags, as I would set the name always e.g. to 
printervlan. But in RFC 3580 is written:

   Note that the VLANID is 12-bits, taking a value between 1 and 4094,
   inclusive.  Since the Tunnel-Private-Group-ID is of type String as
   defined in [RFC2868], for use with IEEE 802.1X, the VLANID integer
   value is encoded as a string.

So what is the recommended solution if I can use only the numerical IDs. Thx 
for your help!


Mit freundlichen Grüßen
Robert Penz

----------------------------------------------------
Dipl. Inf. Robert Penz
DVT-Daten-Verarbeitung-Tirol GmbH
Adamgasse 22, 6020 Innsbruck
Tel: +43 512 508 3334 / Fax: +43 512 508 3355
eMail: [email protected]


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