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Open AccessArticle

Latency-Based Dynamic Controller Assignment in Hybrid SDNs: Considering the Impact of Legacy Routers

1
Key Laboratory of Trustworthy Distributed Computing and Service, Beijing University of Posts and Telecommunications, Ministry of Education, Haidian District, Beijing 100876, China
2
China Electric Power Research Institute, Haidian District, Beijing 100192, China
3
DIANA Team, Institut National de Recherche en Automatique et Informatique (INRIA), 75020 Paris, France
*
Authors to whom correspondence should be addressed.
Future Internet 2019, 11(8), 168; https://doi.org/10.3390/fi11080168
Received: 23 June 2019 / Revised: 22 July 2019 / Accepted: 26 July 2019 / Published: 28 July 2019
Software-defined networking (SDN) is a modern network architecture, which separates the network control plane from the data plane. Considering the gradual migration from traditional networks to SDNs, the hybrid SDN, which consists of SDN-enabled devices and legacy devices, is an intermediate state. For wide-area hybrid SDNs, to guarantee the control performance, such as low latency, multi SDN controllers are usually needed to be deployed at different places. How to assign them to switches and partition the network into several control domains is a critical problem. For this problem, the control latency and the packet loss rate of control messages are important metrics, which have been considered in a lot of previous works. However, hybrid SDNs have their unique characters, which can affect the assignment scheme and have been ignored by previous studies. For example, control messages pass through Legacy Forwarding Devices (LFDs) in hybrid SDNs and cause more latency and packet loss rate for queuing compared with SDN-enabled Forwarding Devices (SFDs). In this paper, we propose a dynamic controller assignment scheme in hybrid SDNs, which is called the Legacy Based Assignment (LBA). This scheme can dynamically delegate each controller with a subset of SFDs in the hybrid SDNs, whose objective is to minimize average SFD-to-control latency. We performed some experiments compared with other schemes, which show that our scheme has a better performance in terms of the latency and the packet loss rate. View Full-Text
Keywords: hybrid SDN; dynamic controller assignment; wide area network hybrid SDN; dynamic controller assignment; wide area network
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Yuan, J.; Li, E.; Kang, C.; Chang, F.; Yuan, T.; Li, X. Latency-Based Dynamic Controller Assignment in Hybrid SDNs: Considering the Impact of Legacy Routers. Future Internet 2019, 11, 168.

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