第326回研究講演会開催報告


日時:平成18年9月27日(水) 15:00−16:30
会場:東北大学工学部 電気情報系3号館 303号室

演題:Availability-Constrained Shared Backup Path Protection (SBPP) for GMPLS-Based Spare Capacity Reconfiguration
講師:Professor Pin-Han Ho, University of Waterloo, CANADA

概要: Shared-backup path protection (SBPP) has been widely studied in the Generalized MPLS networks due to its efficient spare capacity sharing  and flexibility in service provisioning. This paper presents a policy-based model for evaluating the end-to-end (E2E) availability of a SBPP connection by assuming that no more than two simultaneous failures could possibly occur in the network. To minimize the redundancy while meeting the E2E availability requirement, a new parameter is defined for each connection, called protection level, which creates a framework of partial restoration from any unexpected failure. Based on the proposed availability model, two novel policy-based Linear Program (LP) formulations are introduced - called  failure dependent and failure independent policies, which aim to reconfigure the spare capacity allocation for dynamic provisioning of SBPP connections. Extensive simulations are conducted to validate the proposed availability model and demonstrate the effectiveness of the spare capacity reconfiguration architecture. The proposed availability-aware spare capacity reconfiguration (SCR) approaches are then implemented on top of a well known survivable routing scheme - Successive Survivable Routing (SSR), where the spare capacity saving ratio is taken as the performance measure. We will show that the proposed SCR framework is an effective approach for achieving the GMPLS-based recovery in packet-switched networks.

講演報告:
 現在、光ネットワークで注目されているGMPLSなどに多数の質問が寄せられ, 活発な質疑応答が行われた.講師Pin-Han Ho 教授からの丁寧な回答に加えて 参加者の方からも貴重な意見を頂くなど,大変充実した内容であった.

参加者:35名
報告者:堀口進 (東北大学)