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The authors present a framework to facilitate the inter-domain multipath routing for carrier networks that are based on circuit switching technologies, without significant changes to the existing inter-domain protocols. They first introduce a simple mechanism, namely, Single Routing Plane Multipath (SRPM) which can be easily implemented in the existing PCE-based inter- domain architectures. The main idea behind the SRPM method is to represent multiple link disjoint paths as a single virtual edge in the PCE and thus use the existing single path routing mechanisms to enable multipath routing. They further present a more generic mechanism, referred to as Multiple Routing Plane Multipath (MRPM) method, with the goal to facilitate the provisioning of multipath connections over dynamically selected domain chains.
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