Merge 2 MPLS Network

We currently have an MPLS network provided from vendor A and we are moving to
an MPLS network provided by vendor B.
For next 3 months till all other sites get FOC dates we have to utilize MPLS
network provided from vendor A. The only way around is to merge 2 networks and
start routing traffic on MPLS network provided by vendor B, till all sites
eventually are on vendor's B network.
How can one merge 2 MPLS network?
-yuri

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Received on Wed Mar 27 2013 - 16:04:11 ART