port trunk for hp switches?

How should i configure my 3x HP switches?
I have a L3 HP 2910al poe and 2x HP 1910s (l2)
I have 2x vlans 1&20 on the l3 switch and vlan1 only on the 2x 1910s.
Should the port(s) going from the 2910al to the 2x 1910s be marked as a trunk port?
Currently they are left untagged.
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If there's only one VLAN configured on the 1910s and the 2910 is passing the correct VLAN then there's no need to start tagging ports.

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CHI-LTDAuthor Commented:
okay.  just seems that recently data has slowed.  possibly due to prioritising voice on the l3.
Perhaps take a look at the stats on the ports to see if you can find a bottleneck. This might be easier using some kind of SNMP monitoring tool such as PRTG, Spiceworks etc.
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