VLAN port tagging question

VLAN taggings always throws me for a loop. I have a HP Procurve 5412zl and a Dell Powerconnect 6248. Currently the Procurve has multiple VLANs on it and 1 of those VLANs extends to the Dell switch, but the Dell switch (as far as I'm aware) is not aware of the VLAN. To clarify the Dell is pretty much out of the box but the port it plugs into on the Procurve is untagged on VLAN 2. Now I need another VLAN to be able to be used on the Dell Switch.
So my question is how do I tag the ports that connect to the Dell switch so I can use both VLANs.
My assumption is when this is done the default VLAN of the switch will be VLAN2 and if I want something to work on the new VLAN I'll need to untag that port accordingly on the Dell switch.
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js479Asked:
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mlehnertzCommented:
The ports that connect the Powerconnect 6248 and the ProCurve 5412zl together must both be members of the same tagged VLANs to pass multiple-VLAN traffic between the two switches.  

The ProCurve port can be a tagged member of any VLAN that exists on the ProCurve.  The Poweredge only needs to be a member of the VLAN whose traffic must pass to the ProCurve.    

Tagged ports cannot pass traffic to untagged ports.
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js479Author Commented:
So if I understand that correctly I need to change the port on the procurve from an untagged member of VLAN2 to a tagged member of VLAN2 and VLAN4, would that port be an untagged member of any VLANs?
And on the Dell switch I'd need to create VLANs 2 and 4 and then tag the port that connects to the Procurve to both VLAN 2 and 4. Would it be an untagged member of any VLAN?
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mlehnertzCommented:
Correct, the ProCurve and Powerconnect ports would be tagged members of VLAN2 and VLAN4.  Create VLAN4 on the Powerconnect and tag the port as member of VLAN2 and VLAN4.

The ProCurve will not allow you to make a port a member of both a tagged and an untagged VLAN - it's one or the other.  I can't speak for the Powerconnect.  Because the two ports connect a multi-VLAN switch to another multi-VLAN switch, there's no reason for it to be untagged.

If you're programming one of the switches through the other switch, make sure you configure the remote switch first, then the local switch, because the connection will drop between the two switches because of the tagged/untagged differences.
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