Assuming that the VLAN is kept isolated or firewalled from the rest of your network I'd be less concerned about security and more concerned with bridging loops forming due to extending a common VLAN over your entire network.
Assuming that the VLAN is kept isolated or firewalled from the rest of your network I'd be less concerned about security and more concerned with bridging loops forming due to extending a common VLAN over your entire network.
I'm assuming that when you say that you have LAN extension links that you are using layer two across them? If so I would avoid trunking too many VLANS across them as a broadcast storm on any VLAN would saturate your links. The same goes for extending a VLAN across your local network, best practice would dictate layer three should be used to avoid the need for STP for fault recovery etc.
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