re: Any WAN experts on board ? adding a comcast fiber link to AT&T MPLS network

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If they are handing you a layer 2 metro at the location you would need a switch and that is it. It would look like an uplink to another floor in your building.

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True. But just bc the new circuit is capable of layer 2 you can put layer 3 interfaces on either end an route traffic across it from my experience.

Without knowing what type of gear you currently have it's hard to say what your options are.

For example if you have layer 3 switches at either end you could just change the switchports to layer 3 interfaces on either end and route across them. You'd be limited in the QoS queuing you could do using layer 3 switches but that might not be an issue for you.

Personally I'd like to have a remote site in its own network (ie routed) rather than switched.

Again, knowing the type of gear you have would be helpful.