HP Procurve 5300xl tagg and untagged ports

[davidle75]

Hi could you some one give some advice, I want to segment network traffic with a vlan no routing involved, should it be tagged or untagged?? what is the difference between the two?

[Marco Wessel]

The difference is how frames are put onto the wire.

In a situation where you simply want a specific computer connected to a port to be in a vlan, you use untagged traffic. This is normal traffic as generated by the computer itself, too.

Between switches, if you want to have two vlans and have both of them be connected, you could do two things: connect the switches with two wires or use a single wire and tag the traffic. This means the switch will insert a special header in the frames it sends that says 'this frame is from vlan 1', etc.

So if you have only one switch you only need to use untagged.

[davidle75]

Cool so if the vlan just need to be local with grouped ports then i would use vlan x untagg into that ports, if i need for them to talk over switches then i would have to use vlan tagg.

[Marco Wessel]

If you intend for the 'groups' to be connected to edge devices (computers, printers, the like), then yes that is exactly right.