[VLAN] vlan & osi-model

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thx, but, i really do mean vlan ;)

a layer 3 switch can support vlans based on subnet.
a layer 2 switch can only support port based or 802.1q based vlan 
because it cannot look at ip-addresses.

are port based vlan really based on osi-layer 1?

greetings


Vishwas Manral wrote:
> Hi Lars,
> 
> I think you mean layer-1 VPN and not Layer-1 VLAN. 
> 
> VLAN as I know works on Layer-2 Alone.
> 
> Check the link
> http://www.ietf.org/internet-drafts/draft-takeda-l1vpn-framework-01.txt
> to find more about Layer-1 VPN.
> 
> Thanks,
> Vishwas
> 
> -----Original Message-----
> From: vlan-bounces@xxxxxxxxxxxxxxx [mailto:vlan-bounces@xxxxxxxxxxxxxxx]
> On Behalf Of Lars Reimann
> Sent: Monday, September 27, 2004 5:06 PM
> To: Linux 802.1Q VLAN
> Subject: [VLAN] vlan & osi-model
> 
> hi all,
> 
> i've a short question about the different vlan operating modes.
> 
> everywhere it says: layer 1 VLAN, layer 2 VLAN, layer 3 VLAN, layer 4-7 
> vlan.
> 
> my question is, if vlan layer 1 really corresponds to "OSI-Model Layer 1
> 
> " VLAN?
> 
> i do understand that layer 2 vlan works with mac-addresses like 
> osi-model layer 2, and layer 3 vlan inspects ip-adresses for example 
> forming vlans per subnet. but i cannot imagine how per-port vlan works 
> on layer1.
> 
> can anyone help?
> 
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> 
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> 

-- 
-------------------------------------
Lars Reimann	
Praktikant c't Redaktion
c't - Magazin f?r Computertechnik
Helstorferstr. 7
30625 Hannover
Tel.: +49[0]511 5352 300
Fax.: +49[0]511 5352 417
lar@xxxxxxxxxxx
www.heise.de/ct

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