This read-write Integer32 object (1-2147483647) sets the maximum allowed cost related to Cost Based Routing, used by PXM to avoid choosing a path with a cost greater than this configured level, and it's not necessary to provide in the connection setup request. This gives an admin a way to cap how expensive (by whatever cost metric PXM uses) a routed path can be for this connection, preventing it from being routed over an undesirably costly path. An engineer with a cost-sensitive connection would explicitly set this object to constrain PXM's path selection rather than leaving it to PXM's default behavior.