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Dynamic Distributed Bucket Based Shared Path Protection Scheme

Failed Link ID. Link Considered. Dynamic Distributed Bucket Based Shared Path Protection Scheme Andrea Fumagalli, Marco Tacca, Luca Valcarenghi, Parthasarathy Kothandaraman, Sandeep Darisala Optical Networks Advanced Research (OpNeAR) Lab.,

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Dynamic Distributed Bucket Based Shared Path Protection Scheme

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  1. Failed Link ID Link Considered Dynamic Distributed Bucket Based Shared Path Protection Scheme Andrea Fumagalli, Marco Tacca, Luca Valcarenghi, Parthasarathy Kothandaraman, Sandeep Darisala Optical Networks Advanced Research (OpNeAR) Lab., Erik Jonsson School of EECS, University of Texas at Dallas Concept of bucket IP Over WDM • IP over WDM • Highly dynamic IP traffic characteristics  high flexibility in WDM • WDM data plane • IP/GMPLS control plane • Routing  OSPF • Signaling  CR-LDP • Buckets refer to protection bandwidth profile of a network link • Bucket hlkrepresents the number of required protection wavelengths on link l upon the specific failure event (e.g., link k failure) • Buckets determine sharability 4 1 3 2 Link State Protocol Path Calculation Signaling • Two link costs utilized for path calculation • Working lightpath • Link cost depends on available link resource (wavelength) • Protection lightpath • Working lightpath links have infinite cost (diverse routing) • Remaining link cost based on posibility to share protectionresources (wavelength) already reserved • Working Path signaling Protection path signaling • WP-RESERVE PP-RESERVE • WP-BLOCKING PP-BLOCKING • WP-MAPPING PP-MAPPING • WP-RELEASE PP-RELEASE • Based upon proposed extensions to GMPLS signaling protocol • Working Path Reservation • Working Path Vector • BW Required • Protection Path Reservation • Protection path vector • Working Path Vector • BW required • Working Path Release • Protection Path Release • Link State Advertisement (LSA) • sequence number • age field • whether link is up / down • link cost • Extensions to LSA • link’s capacity • amount of resources consumed • link’s buckets • Periodic flooding of LSA • all nodes flood LSAs at periodic intervals Effect of OSPF convergence Summary • Considered distributed bucket-based shared path protection scheme for survivable dynamic lighpaths • Evaluated effect of convergence time of link-state advertisement protocol on lighpath blocking probability • When LSA update cannot keep up with lightpath request arrivals blocking probability due to link-state misalignment grows significantly • Results helps in setting up LSA update interval • When  and 1/ are comparable with T source blocking increase is far less than other blocking contribute increase • As  shortens blocking during the reservation phase is the main contribution Prism Network, cl=4 Italian Network, cl=4

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