Abstract
Software-defined elastic optical networks (SD-EONs) provide operators more flexibility to customize their optical infrastructures dynamically. By leveraging infrastructure-as-a-service (IaaS), virtual SD-EONs (vSD-EONs) can be realized to further enhance the adaptivity of SD-EONs and shorten the time-to-market of new services. In this paper, we design and demonstrate the building and operating of quality-of-service (QoS) aware survivable vSD-EONs that are equipped with transparent data plane (DP) resiliency. Specifically, when slicing a vSD-EON, our network hypervisor (NHV) chooses to use "1:1" virtual link (VL) protection or on-demand VL remapping as the DP restoration scheme, according to the service-level agreement (SLA) between the vSD-EON's operator and the infrastructure provider (InP). Then, during an actual substrate link (SL) failure, the NHV realizes automatic DP restoration that is transparent to the controllers of vSD-EONs. We build a network testbed to demonstrate the creation of QoS-aware survivable vSD-EONs, the activation of lightpaths in the vSD-EONs to support upper-layer applications, and the automatic and simultaneous QoS-aware DP restorations during an SL failure. The experimental results indicate that our vSD-EON slicing system can build QoS-aware survivable vSD-EONs on-demand, operate them to set up lightpaths for carrying real application traffic, and facilitate differentiated DP restorations during SL failures to recover the vSD-EONs' services according to their SLAs.
Highlights
Flexible-grid elastic optical networks (EONs) rely on agile bandwidth management [1] in the optical layer to make optical networks more adaptive and not be restricted by the fixed spectrum grids or rigid optical transmission setup [2, 3]
The experimental results indicate that our vSD-EON slicing system can build QoS-aware survivable vSD-EONs on-demand, operate them to set up lightpaths for carrying application traffics, and facilitate differentiated data plane (DP) restorations during substrate link (SL) failures to recover the vSD-EONs’ services according to their service-level agreement (SLA)
First of all, when a vSD-EON operator sends a vSD-EON request to the infrastructure provider (InP), virtual network manager (VNMgr) calculates the survivable virtual network embedding (S-VNE) scheme of virtual DP (vDP) embedding based on the information in it, i.e., the vDP topology, bandwidth requirement, SLA, and end-node locations
Summary
Flexible-grid elastic optical networks (EONs) rely on agile bandwidth management [1] in the optical layer to make optical networks more adaptive and not be restricted by the fixed spectrum grids or rigid optical transmission setup (e.g., bit-rate and modulation selections) [2, 3]. We first design and implement a QoS-aware survivable vSD-EON slicing system that utilizes an OpenVirteX [23] based NHV to realize automatic DP restoration that are transparent to the controllers of vSD-EONs. when slicing a vSD-EON, the NHV determines whether to use “1:1" virtual link (VL) protection or on-demand VL remapping to restore its DP services when substrate link (SL) failure happens, according to the servicelevel agreement (SLA) between the vSD-EON’s operator and the infrastructure provider (InP). The experimental results indicate that our vSD-EON slicing system can build QoS-aware survivable vSD-EONs on-demand, operate them to set up lightpaths for carrying application traffics, and facilitate differentiated DP restorations during SL failures to recover the vSD-EONs’ services according to their SLAs. To the best of our knowledge, this is the first experimental demonstration of building and operating of QoS-aware survivable vSDEONs with transparent resiliency, which covers both CP and DP operations and incorporates real application traffics (i.e., the “full stack" investigation).
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