Dynamic resource management in SDN-based virtualized networks

Abstract

Abstract-Network virtualization allows for an abstraction between user and physical resources by letting a given physical infrastructure to be shared by multiple service providers. However, network virtualization presents some challenges, such as, efficient resource management, fast provisioning and scalability. By separating a network's control logic from the underlying routers and switches, software defined networking (SDN) promises an unprecedented simplification in network programmability, management and innovation by service providers, and hence, its control model presents itself as a candidate solution to the challenges in network virtualization. In this paper, we use the SDN control plane to efficiently manage resources in virtualized networks by dynamically adjusting the virtual network (VN) to substrate network (SN) mappings based on network status. We extend an SDN controller to monitor the resource utilisation of VNs, as well as the average loading of SN links and switches, and use this information to proactively add or remove flow rules from the switches. Simulations show that, compared with three state-of-art approaches, our proposal improves the VN acceptance ratio by about 40% and reduces VN resource costs by over 10%.

Self-managed resources in network virtualisation environments

“…Future works will involve extending the approach to consider multiple link failures, and hence node failures. For all three sub-problems, it may also simplify resource management in NVEs, by employing SDN [46].…”

A Game-Theoretic Based QoS-Aware Capacity Management for Real-Time EdgeIoT Applications

“…A flow migration approach to dynamically managed link and switch resources in an SDN-based virtualised environment was presented in [33]. The technique extended a floodlight controller by adding an application module which monitors the resource costs of mapped virtual links, as well as average load of the substrate links and switches.…”

A dynamic resource defragmentation scheme for virtualized SDN-enabled substrate networks

“…We distinguish two categories of approaches according to the trigger mode: periodic [3] [4] and event-based. This last category is decomposed into three subcategories: (1) reactively triggered on VN request rejection; (2) proactively [2] [5] triggered by events like VN departure and (3) hybrid which can be triggered when a VN request embedding fails or/and on a VN expiration. Some solutions [3][6] [5] condition the recon guration by the level of congestion beyond which the recon guration happens.…”

“…Input : G(N, L); X set of running Virtual Links; F k ∀k ∈ X; θ; N max ; τ 1 begin 2 Initialize ℵ θ ←− set of substrate links (i, j) : s(i, j) ≥ θ ∪ set of substrate nodes i :…”

“…The emerging SDN paradigm has been recognized as a key solution to overcome these problems by enabling dynamic and automated con gurations for a fast and reliable deployment. But, its use has also introduced some new constraints, namely, the limited capacity of forwarding tables, which is actually around a few thousands of entries [1] [2] in commodity SDNcompliant switches. These switching resources are not only requested by virtual nodes, they are also required to embed VLs.…”