This object points to an entry in the cienaCesmplsTunnelPathTable that specifies the explicit route hops this dynamic encap tunnel must follow, as the description states. This matters because it lets an admin force a signaled LSP over a specific set of links for capacity, latency, or diversity reasons, rather than leaving path selection entirely to the IGP-based metrics the signaling protocol would otherwise use on its own. For example, a path index of 5 referencing a pre-defined explicit path forces this LSP through a specific set of core routers rather than whatever the shortest computed IGP path would otherwise be.