hi, first of all: thanks for frequent replies! i strongly agree with Jojan, and that osi-model and vlan naming have not much in common ;) in fact there are many different names for the same things, but i think i ve understood now. THX, Lars JOJAN wrote: > 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? > > _______________________________________________ > Vlan mailing list > Vlan@xxxxxxxxxxxx > http://www.lanforge.com/mailman/listinfo/vlan > > > --------------------------------------------------------------------------- > "This e-mail and any files transmitted with it are for the sole use > of the intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient, please contact the > sender by reply e-mail and destroy all copies of the original message. > > Any unauthorized review, use, disclosure, dissemination, forwarding, > printing or copying of this email or any action taken upon this e-mail is > strictly prohibited and may be unlawful." > --------------------------------------------------------------------------- > _______________________________________________ > Vlan mailing list > Vlan@xxxxxxxxxxxx > http://www.lanforge.com/mailman/listinfo/vlan > -- ------------------------------------- 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
