IS-IS for FabricPath

Hi all,

Lets say we have two data center locations and one remote location and MPLS VRF configured between the data centers and the remote location.  We use IS-IS as the IGP.  Now we want to run FabricPath between the data centers, could we use the existing IS-IS domain or would we need to create a whole new domain?  What is best practice in this scenario?

Thanks