On 2/9/2011 2:46 PM, Wil Schultz wrote:
You're going to want to use sub-interfaces for both VLAN's, use "router on a 
stick" as your google-fu keywords.


On Feb 9, 2011, at 2:28 PM, Tim Donahue wrote:
interface gigabitEthernet 0/0
  ip address 10.1.10.1 255.255.255.0
!
interface gigabitEthernet 0/0.20
  encapsulation dot1q 20
  ip address 10.1.20.1 255.255.255.0

I don't know about the 3845 specifically, but every Cisco router that I have worked with that does support sub-interfaces will work just fine with the above configuration. The gi0/0 will be the native VLAN and gi0/0.20 will be a tagged VLAN.

--
Jerry Bacon
Senior Network Engineer

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