I was wondering how a core switch would feed VLANs to a remote router through other routers. For example, if someone is using DSL on a DSLAM using Vlan 2, which from the DSLAM is connecting to Router A, Router A is then connected via Serial to Router B, which is connected to Router C, then Router D, then to Switch A. Wouldn't Switch A be trunked with router D, which is Trunked using .1q on it's Serial port to Router C's serial, which is trunking with Router B and so on until it gets to Router A, or would it not even need .1q trunking between the routers? Do you have any insight?