[VLAN] vlan & osi-model

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AFAIK, these are not official names.

Layer <n> VLAN is really a layer 2 solution, but it depends on some layer
<n> feature to make decision on what to do with a packet.

These rules apply only for those packets which are untagged. When they enter
the switch, the switch has to TAG it before making a decision as to which
all ports the frame has to be forwarded.

If the switch has Layer3 configurations, those rules are taken first - 
then comes layer 2 configurations
then comes layer 1 configurations.

Layer3 VLAN is named so because it examines the Layer3 packet for input to
the rules e.g., IP subnet
Layer2 VLAN is named so because it examines the layer2 features for input to
the rule e.g., MAC address, Frame Type
Layer1 VALN is named so because it checks the physical features - the port
thru which it entered the switch

Hope this is clear.

regards

jojan


-----Original Message-----
From: Lars Reimann [mailto:lar@xxxxxxxxxxx]
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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http://www.lanforge.com/mailman/listinfo/vlan


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