Abstract
A top concern in Software-Defined Networking (SDN) is the management of network flows. The resource limitation in SDN devices, e.g., Ternary Content Addressable Memory (TCAM) size, and the signaling overhead between the control and data plane elements can impose scalability restrictions for a network. A notable SDN technology is the OpenFlow protocol, and failures in links and nodes inside an OpenFlow network could lead to drawbacks, such as packet loss. This work proposes the Local Node Group fast reroute (LONG), a hybrid resilience mechanism for OpenFlow networks that combines protection and restoration resilience mechanisms. The results achieved indicate that LONG is a practical approach when compared against the state-of-the-art algorithms.
Highlights
Software-Defined Networking (SDN) is emerging as a new paradigm [1,2,3,4], which proposes to avoid the vertical integration and separation of logic control from devices to promote innovation.SDN enables a global view and network programmability of the infrastructure through its centralized network management approach based on the so-called SDN controller [5,6].There are some instances of the concepts of SDN [7], and one of them is the OpenFlow protocol [8].The OpenFlow protocol allows an OpenFlow controller to program the Forwarding Information Base (FIB) of OpenFlow switches [8]
Local Node Group fast reroute (LONG) is analyzed against the Path Protection (PP), Local Restoration (LR), Path Restoration (PR) and Local Fast Restoration (LFR) approaches
Controller to recover from a link failure. This is not the case for the protection mechanisms, which is the case of path protection and the LONG protection phase, as all recovery rules are already installed inside the OpenFlow switches, and those rules protect the network from a link failure
Summary
Software-Defined Networking (SDN) is emerging as a new paradigm [1,2,3,4], which proposes to avoid the vertical integration and separation of logic control from devices to promote innovation. Decoupling hardware and software of network devices is a major feature of SDN and imposes more latency for restoration resilience mechanisms due to communication between data and control plane elements. This approach makes the network state maintenance more straightforward, once the failure event is notified to the controller. FF notoriously reduces the recovery time after a link failure [14,16,17], it produces an inconsistency of the network state inside the controller, as all restoration processes occur at the data plane level (OpenFlow switches). A literature review of the current state-of-the-art in resilience mechanisms for OpenFlow networks is in Section 3; The presentation of LONG, a hybrid resilience mechanism for OpenFlow networks, is in Section 4; The remainder of this paper is organized as follows: Section 2 presents preliminary concepts about OpenFlow and resilience mechanisms; Section 3 depicts related works; Section 4 details LONG’s logic; Section 5 describes the performance evaluation executed; Section 6 discusses the main results of this paper; and Section 7 provides the final thoughts
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