期刊
ACM SIGCOMM COMPUTER COMMUNICATION REVIEW
卷 43, 期 4, 页码 3-14出版社
ASSOC COMPUTING MACHINERY
DOI: 10.1145/2534169.2486019
关键词
Centralized Traffic Engineering; Wide-Area Networks; Software-Defined Networking; Routing; OpenFlow
We present the design, implementation, and evaluation of B-4, a private WAN connecting Google's data centers across the planet. B-4 has a number of unique characteristics: i) massive bandwidth requirements deployed to a modest number of sites, ii) elastic traffic demand that seeks to maximize average bandwidth, and iii) full control over the edge servers and network, which enables rate limiting and demand measurement at the edge. These characteristics led to a Software Defined Networking architecture using OpenFlow to control relatively simple switches built from merchant silicon. B-4's centralized traffic engineering service drives links to near 100% utilization, while splitting application flows among multiple paths to balance capacity against application priority/demands. We describe experience with three years of B-4 production deployment, lessons learned, and areas for future work.
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