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routing between 2 domains

I have 3 data centers spread across 2 different companies.  
2 are in the same building separated by a wall (Data Center A and Data Center B)
1 is in a different state (Data Center C)

Data Center A and C belong to the same company, are part of the same domain and are connected via MPLS.

Data Center B is a different company and different domain.

There is a trust between the two domains.  Datacenter B can communicate with Data Center A as there is a direct connection between the two L3 switches.

I want to set up communication between Data Center B and C using the MPLS connection  between A and C

I am not sure how I need to set that up. I had hoped all I would need to do was set up the vlan and add routing to DataCenter B. This is not the case.
Please assist
1 Solution
Depending on the MPLS type and configuration, you probably need to add routes to datacentre B to the MPLS via datacentre A, otherwise the routers on the MPLS will not know where to send the traffic, or if there is a default route on the MPLS, this could be going out the wrong gateway.

If this is managed by your provider, you will need to speak to them about this.
dustaineAuthor Commented:
That makes sense and something I have been thinking about.  I have a call in to them and will approach it that way as well.
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