A Framework for Establishing Efficient SDN Environment
Date Issued
2015
Date
2015
Author(s)
Huang, Yu-Cheng
Abstract
SDN (Software-Defined Network), unlike the distributed traditional net- work, is a centralized network. It features its highly configurable characteris- tic, and has been adopted by large corporations for industrial purposes. How- ever, since SDN operates on existing network protocols, which are designed for distributed networking systems, there is room for improvement to better adapt the SDN to existing network protocols. This thesis proposes a framework to improve the efficiency of SDN, both in LAN and WAN. In this framework, by handling broadcast packets in dif- ferent proxies, broadcast packets in LAN are no longer necessary and are thus eliminated. This saves the bandwidth wasted by broadcast packets and shortens the response time. This also solves the problem caused by broadcast packets, such as the broadcast storm. In WAN, the framework allows multiple gateways to be connected, and it aggregates them into a logically centralized virtual gateway. This virtual gateway is then able to provide bandwidth en- hancement, load balance and redundancy. The virtual gateway has no limit on the number of connected gateways (WAN ports), while existing commercial WAN load balancers are limited to only 2-4 WAN ports. Experiments conducted in a regular office with 49 hosts proved the effec- tiveness of our framework in LAN, and experiments on Mininet showed that our implementation of the virtual gateway provides (weighted) WAN load bal- ance, bandwidth enhancement and redundancy using multiple physical gate- ways.
Subjects
network
SDN
broadcast packet
virtual gateway
load balance
Type
thesis
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