Hi Edward,
A1: You could use EoMPLS/VLANoMPLS or L2TPv3, if your equipment/IOS does support this.
The requirement will be MPLS activation between the two sites and EoMPLS or L2TPv3 configuration.
For EoMPLS configuration have a look at "MPLS AToM: Transport, Platform, and Release Specifics" and the following chapters.
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804a0d17.html
For L2TPv3 configuration have a look at "L2TPv3: Layer 2 Tunneling Protocol Version 3"
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804420e7.html
Basically you transport all ethernet/dot1Q frames between two ethernet ports over an IP or MPLS network.
Afaik MPLS will give better performance but also requires and end-to-end label switched path, i.e. changes in the transport network. L2TPv3 uses IP to tunnel the L2 frames, so in principle only endpoints need to be configured. Both technologies might give you MTU related issues because of the additional overhead, which need to be addressed in the transport network. So check the intermediate network (especially all sort of ethernet interfaces) for support of jumbo frames.
A2: you can avoid this for now using A1 ;-)
A3: DWDM across the fiber and real VLANs end-to-end. Or simple GE over the fiber with a mixture of routed and switched VLANs through a L3 switch. But A3 is just a wild guess without details regarding your topology and hardware.
Hope this helps!
Regards, Martin
