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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?

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Why not separate the phone system onto a third VLAN? –  Chris McKeown Sep 26 '12 at 19:57
    
It is on a 3rd vlan. –  Matt Sep 29 '12 at 1:46
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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.

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I have setup the vlans so phone system is on the main vlan, company A is on another and company B on the 3rd vlan. This however allows company A and B able to ping one another. Now I will need to setup DHCP for company A and B. If A and B are able to ping one another wont this interfere with proper DHCP leasing? –  Matt Sep 29 '12 at 1:45
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