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VLAN Routing, Cisco 2960 & 3560

My network mainly consists of Cisco 2960s, with one 3560 to handle VLAN routing.  Currently we have two VLAN's (Site A and Site B) which are connected via point to point wireless dishes.

I'd like to introduce a third VLAN, which would span both sites.  I understand how to add a third VLAN, but what I'm not sure of is the routing.  The new VLAN, VLAN 3, should have no routing ability with the other two VLANs.  How do I configure this?

Thanks in Advance.
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giltjr
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Are you sure you want VLAN 3 to span both sites?  This could cause serious performance problems depending on how much bandwidth the wireless connection is and how much traffic is flowing.

You would need to implement  ACL's on any device that VLAN 3 exists on.
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Wireless connections are load balanced and are a total of 99MBit Full Duplex.

So having never done anything ACL's  Can you give me any pointers?  Any sites I can read about them?

Thanks
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Cool... I will have to try that...  Much easier than ACL's, which I do need to learn; and had started to read up on.
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Sweet, thanks guys!  It's working like a charm.