SIGCOMM2013: B4 Experience with a Globally-Deployed
Software Defined WAN
This is a report of the presentation done by Amin
Vahdat on 2013-08-13. Paper co-authors
are Sushant Jain, Alok Kumar, Subhasree Mandal, Joon Ong, Leon Poutievski,
Arjun Singh, Subbaiah Venkata, Jim Wanderer, Junlan Zhou, Min Zhu, Jonathan
Zolla, Urs Hölzle, and Stephen Stuart(Google).
Wide Area Networks (WANs) that connects data centres are
critical to Internet performance and expensive resource. Amin started his presentation
with a few questions: Why adopt a new WAN architecture? How can we build a network that built from
merchant silicon, run network links at ~ 100% utilization, and differentiate
between hi/low priority traffic?
In his talk, Amin presented his team experience in
design, implementation, and evaluation of B4. B4 is a private Wide Area Network
(WAN) connecting Google’s data centres across the planet. Amin described the
special characteristics of Google’s data centres WAN that led to adopt Software
Defined Network (SDN) architecture and OpenFlow to control individual switches.
In particular, he discussed how they support standard routing protocols and
centralized Traffic Engineering at their first SDN application. Regard the
performance, Amin showed that B4 links run at near 100% utilization.
Also B4 performance has exceed their expectations but
it has one outage that highlighted a number of important areas for SDN and WAN
deployment future works:
- Scalability and latency of the packet IO path between OFC and OFA is crucial and important for evolving OpenFlow
- OFA should be asynchronous and multithreaded for more parallelism.
- Additional performance profiling and reporting
- TE server must be adaptive to failure OFC when modifying TG that depends on creating new tunnels.
- Measuring system performance to its breaking point with published envelopes regarding system scale.
Here is the full paper: http://conferences.sigcomm.org/sigcomm/2013/papers/sigcomm/p3.pdf
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