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Create vlan

Hi, I'm trying to setup a new vlan for guest wifi network using the asdm. I've got a 5510 with a security plus license so I know my vlan limit is at 100. In asdm I go to configuration --> interfaces and I've already got all the physical vlans in use. e0/0 is my inside, e0/1 is out, e0/2 is for my redundant ISP link and e0/3 is used for HA failover between two asa's. How can I create this additional vlan when they're all in use however the limit is 100? I don't believe I would need a physical cable to go from one of the interfaces on the asa to the switch in order to make the guest wifi work, correct? I'm following this guide btw: http://itguy11.wordpress.com/2010/07/21/guest-wireless-access-using-a-cisco-asa-5510-with-vlan-configuration/

Thanks for all the help.

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You use subinterfaces and

You use subinterfaces and trunk the VLANs onto them.