Yes, I would agree that the route 10.10/16 going through the MPLS is probably a problem - unless you want the traffic to go COLO -> Corporate -> DSO. But more important, you say DSO has no routes - how does traffic from DSO get anywhere? It seems like COLO-to-DSO link needs it's own address assignment (like a /30 or /31), and then route that traffic to it.
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