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Hash-based Load Balanced Traffic Steering on Softswitches for Chaining Virtualized Network Functions
(2017-01-01)
Thai, Minh-Tuan
;
Lin, Ying-Dar
;
Linz, Po-Ching
;
Lai, Yuan-Cheng
;
交大名義發表
Prior load balancing solutions for chaining virtualized network functions cause significant control and data plane overheads and demand special requirements on network hardware. In this study, we present the design, implementation, and evaluation of Hash-based Traffic Steering on Softswitches (HATS), a load balancing mechanism that aims at mitigating such drawbacks. The method exploits flow hashing technique implemented on softswitches to perform server and network load balancing without triggering the control plane. We have implemented this design using OpenDayLight controller and Open vSwitch platform. The implementation demonstrates that HATS can be readily implemented with commodity network hardware. Furthermore, the experiment results confirm that HATS can reduce the number of flow entries and service chaining time up to 85% and 93%, respectively, when compared with Least Load First (LLF), a controller-based service chaining algorithm.
Performance Modeling of SDN with NFV under or aside the Controller
(2017-01-01)
Fahmin, Ahmed
;
Lai, Yuan-Cheng
;
Hossain, Md. Shohrab
;
Lin, Ying-Dar
;
Saha, Dipon
Software Defined Networking (SDN) emphasizes the separation of data and control plane while network function virtualization (NFV) decouples network function from underlying hardware. Combining SDN with NFV would have many benefits, but the problem is how to integrate them. There are two possible architectures for such integration: the controller interacts with virtualized network functions (VNFs) or the switch interacts with VNFs. In this paper, the former is referred to as NFV under the controller (NFV_C) while the latter is called NFV aside the controller (NFV_AC). To the best of our knowledge, there is no analytical model for mathematically investigating the performance of such architectures. This paper therefore aims to carry out analytical modeling of SDN with NFV under or aside the controller. We model and analyze these two SDN+NFV architectures using M/M/1 queuing model and validate our analysis with various simulations. Results show that the analytical results well match the simulation results. Also a packet delay reduction of 54.67% can be achieved for NFV_AC over NFV_C, meaning that NFV_AC is a better architecture for integrating SDN with NFV.
Performance modeling and comparison of NFV integrated with SDN: Under or aside?
(2018-07-01)
Fahmin, Ahmed
;
Lai, Yuan-Cheng
;
Hossain, Md Shohrab
;
Lin, Ying-Dar
;
資訊工程學系
Software Defined Networking (SDN) focuses on the separation of data and control plane, while network function virtualization (NFV) decouples network functions from underlying hardware. Combining SDN with NFV would have many benefits, but the problem is how to integrate them. There are two possible architectures for such integration: the controller interacts with virtualized network functions (VNFs), or the switch interacts with VNFs. In this paper, the former is referred to as NFV under the controller (NFV_C) while the latter is called NFV aside the controller (NFV_AC). To the best of our knowledge, there is no analytical model for mathematically investigating the performance of such architectures. This paper therefore reports on the analytical modeling of SDN with NFV under or aside the controller. We model and analyze these two SDN + NFV architectures using an M/M/1 queuing model and validate our analysis with various simulations. We show that the analytical results match the simulation results very well. Furthermore, a packet delay reduction of 68.83% can be achieved for NFVAC over NFVC, meaning that NFVAC is a better architecture for integrating SDN with NFV. We also consider feedback from the VNF to the switch. For low loads there is delay increase of 35.42% for high feedback (90%) in comparison with low feedback (10%). In the case of high loads we recorded a delay increase of 66.64%.
Joint server and network optimization toward load-balanced service chaining
(2018-07-10)
Minh-Tuan Thai
;
Lin, Ying-Dar
;
Lai, Yuan-Cheng
;
交大名義發表
;
資訊工程學系
Prior service chaining systems address server and network load balancing issues individually, which may not ensure efficient system performance. To this end, in this paper, we study the design, implementation, complexity analysis, and evaluation of Nearest First and Local-Global Transformation algorithm, which jointly supports server and network load balancing for chaining virtualized network functions (VNFs) in data center environment. The algorithm firstly constructs service chains by a greedy strategy, which both considers server and network latency. Then a searching technique, which replaces a selected VNF with another candidate and swaps the order of VNFs in service chains, is applied to improve the solutions. We have implemented the algorithm using Software-defined networking and OpenFlow concepts. The numerical results indicate that, compared with a sequential approach, Nearest First and Local-Global Transformation increases the system bandwidth utilization up to 45%. The results also show that it is worth applying the second phase of our algorithm since it considerably enhances the system performance by 20%.
Towards load-balanced service chaining by Hash-based Traffic Steering on Softswitches
(2018-05-01)
Thai, Minh-Tuan
;
Lin, Ying-Dar
;
Lin, Po-Ching
;
Lai, Yuan-Cheng
;
資訊工程學系
In this paper we study Hash-based Traffic Steering on Softswitches (HATS) which is a load balancing scheme for chaining virtualized network functions (VNFs), with the aim of mitigating the control and data plane overheads of existing methods. Our method uses a flow-hashing technique applied to softswitches to carry out server and network load balancing without triggering the controller. By exploiting the advantages of HATS, we then derive two algorithms, HATS with Flowcell-based Multipathing (HATS-Flowcell) and Dynamic Weight Adjustment for HATS (D-HATS), to address hash collision problems which downgrade system performance. The first algorithm divides an elephant flow into various equal-size flowcells, which are distributed over network paths as individual flows. The second algorithm periodically updates the hashing weights of VNFs and network paths according to their current load status. Our implementation demonstrates that HATS can be readily deployed on commodity network hardware. Furthermore, our experimental results show that D-HATS has roughly the same load balancing performance with Least Load First (LLF), a controller-based service chaining algorithm; while significantly reducing the number of flow entries and service chaining time by 54% and 93%.
A Joint Network and Server Load Balancing Algorithm for Chaining Virtualized Network Functions
(2016)
Minh-Tuan Thai
;
Lin, Ying-Dar
;
Lai, Yuan-Cheng
;
交大名義發表
;
National Chiao Tung University
Chaining virtualized network functions (VNF) is an effective practice to deploy network services in network operator\'s data centers. Two common concerns arise in such a deployment arc network load balancing and server load balancing. In this study, motivated by the argument that such two concerns should be jointly addressed for efficiently chaining VNFs in a data center environment, we propose a 2-phase algorithm, Nearest First and Local-Global Transformation (NF-LGT), which concurrently supports network and service load balancing. The algorithm firstly constructs service chains by a greedy strategy which both considers network latency and server latency. Then a searching technique is applied to improve the solutions. We have implemented the algorithm using Software-defined networking (SDN)/OpenFlow concept. The experimental results indicate that, compared with a sequential approach, NF-LGT improves the system bandwidth utilization up to 45%.

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