Usually, when Cisco oriented networker sets off to the HP networking world, first confusing thing is VLAN port assignment. When speaking about VLAN ports in HP world, the ports can be tagged or untagged (despite the access / trunk ports in Cisco). As you may guess, tagging means 802.1q tagging in Ethernet frames. It is important to realize that Cisco is “port-centric”, whereas Procurve is is “vlan-centric” when speaking about