Dynamic Cross-Layer Restoration to Resolve Packet Layer Outages in FlexE-Over-EONs

• Published in: IEEE eTransactions on network and service management Vol. 19; no. 3; pp. 2600 - 2611
• Main Authors: Wu, Meihan, Da Fonseca, Nelson L. S., Zhu, Zuqing
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; cross-layer restoration; Effectiveness; elastic optical networks (EONs); EPON; Ethernet; Flexible Ethernet (FlexE); IEEE 802.3 Standard; Integer programming; Linear programming; Network latency; network survivability; Optical communication; Optical fiber networks; Optical packet switching; Optical switches; Outages; Planning; Resource utilization; Restoration; Symbiosis; Topology
• ISSN: 1932-4537; 1932-4537
• DOI: 10.1109/TNSM.2022.3178720

As a promising technology, Flex Ethernet (FlexE) helps to realize deterministic and ultra-low latency in metro and transport networks. Meanwhile, previous studies have confirmed the advantages of the symbiosis of FlexE and elastic optical network (EON) (i.e., a FlexE-over-EON) on resource utilization and cost-effectiveness. In this paper, we consider the cross-layer restoration (CLR) in FlexE-over-EONs based on the FlexE-aware architecture. Specifically, we address the situation where an outage happened on one FlexE switch in the packet layer to bring it offline temporarily and then the affected client flows need to be recovered quickly and proactively. Three CLR strategies are first proposed to fully explore the flexibility of FlexE-over-EON for restoring the affected flows. Then, with the strategies, we formulate an integer linear programming (ILP) model and design an auxiliary graph (AG) based algorithm to reroute the affected flows as well as minimize the additional operational expense (OPEX) incurred during the CLR. Extensive simulations verify the effectiveness of our proposed CLR algorithms.