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In generalized multiprotocol label switching (GMPLS)-enabled wavelength-switched optical networks (WSONs), shared path protection (SPP) attains 100% survivability with an acceptable recovery time, for lightpaths affected by a single-link failure. This is achieved by sharing backup resources. Nevertheless, neither the standard OSPF-TE nor the RSVP-TE protocols support the respective flooding/collection of shareable resource information for SPP purposes. This prevents the source node from computing backup paths exploiting the SPP advantages, and the destination node from performing optimal wavelength assignment (WA) favoring the reuse of shareable resources. In this paper, we experimentally evaluate, in the GMPLS control plane of the ADRENALINE testbed, the performance improvements when shareable resource information is either flooded (by enhanced OSPF-TE) and/or collected (by enhanced RSVP-TE), under the wavelength continuity constraint. Additionally, we propose efficient SPP path computation and WA algorithms, considering three information dissemination strategies: aggregated unreserved bandwidth, aggregated shared bandwidth, and wavelength-channel granularity.