I have a question I have two hp procurve 2510-48 switches and I have two companies sharing a network and I want to separate them by giving them their own VLAN. However they share a phone system so I want to grant ports access to phone system VLAN. How can I go about granting ports the ability to talk to another VLAN assuming they are on a sub net that can talk to each other?
You want to use 802.11q vlans (tagging). This allows ports to belong to more than one vlan. So you will have a set of ports that only belong to the vlan for company A, a set of ports that only belong to the vlan for company B, and a set of ports that are members of both vlans, where the phone system equipment is connected.