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Cisco 3925/k9 sub-interface vlan support

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http://serverfault.com – I've got a brand new cisco router 3925/k9. I wanted to set up a router on a stick on my network, but it turns out it doesn't support vlan sub-interfaces. I did it multiple times in gns3 simulator on other routers, so I am familiar with IOS commands and concepts. I believe this must be a licensing issue, but so far I couldn't find anything on cisco website that explains it. Here is some info from "show version": ROM: System Bootstrap, Version 15.0(1r)M13, RELEASE SOFTWARE (fc1) System image file is "flash0:c3900-universalk9-mz.SPA.151-4.M2.bin" 3 Gigabit Ethernet interfaces 1 terminal line 1 V (HowTos)