SOA 12C Enterprise Deployment - Clustered

Question

We are currently implementing 12c with OSB(Oracle Service Bus), OTD (Oracle Traffic Director) and SOA
AS you can imagine the build has a number of SOA composites.
IN our Test and Production environments, we have 2 nodes per cluster, and we have separate OSB and SOA clusters. We also make use of MDS
Now to set the scene, a number of our SOA composites call other down stream composites.
As an example a payment composite may call a create customer composite as part of its process.
The way we have configured this all is the SOA Composites point to MDS, and the WSDL (Endpoint URL) contains the URL for the second service.
We currently have a situation where if a service is called on Node1, it will always call the downstream services on Node1 due to the fact that the MDS wsdl has the NODE1 endpoint Url Hard coded.
Obviously this does not make sense in a clustered environment, as such i am seeking assistance from the community on what the best practice is in this situation.
Our current thoughts are
     1) Have the MDS wsdls point at a load balacer (potentially OTD or some other LBR) which will then distribute the traffic down stream
     2) Have the SOA composites point at an OSB proxy, which does load balancing to the downstream SOA composites
     3) Somehow configure the MDS wsdls to have the end points generate dynamically at run time (hopefully this will then automatigically distribute the load)
Any advice is welcome

Answer 1

I think what you're looking for is "callback url"(in enterprise manager) and "frontend host/port" (in weblogic console -> cluster -> http tab).
hope it helps