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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
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dustaine
Asked:
dustaine
1 Solution
 
InteraXCommented:
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.
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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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