SDN and OSCARS how-to Evangelos Chaniotakis Network Engineering Group ESCC Indianapoilis, July 2009 Energy Sciences Network Lawrence Berkeley National.

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Presentation transcript:

SDN and OSCARS how-to Evangelos Chaniotakis Network Engineering Group ESCC Indianapoilis, July 2009 Energy Sciences Network Lawrence Berkeley National Laboratory Networking for the Future of Science

Why use SDN? Provides tools to do traffic engineering on big science flows (vs. small enterprise). For these big flows: –Traffic isolation allows impolite protocols –Guaranteed WAN bandwidth –More efficient long-latency flows –Use appropriate layer (L2 : cheaper) SDN can help your site network (and ESnet!) be more efficient and cost-effective.

Preparing for SDN Discover Which are the big apps? Who are the people? Establish rapport, dialogue & procedures. Measure Deploy PerfSONAR Measure performance, identify weaknesses Remedy Fix low-hanging fruit in the site network / hosts (e.g.: host TCP tuning)

Using SDN Experiment Evaluate SDN L3 service Deploy Reconfigure site to support chosen SDN configuration Integrate Mesh SDN VC scheduling into workflow

Separate Enterprise and Science Networks

Baseline SDN setup Use case: A data source / sink at an ESnet site. –The site network is configured once (at most), statically. –Other endpoints can now be connected to it over SDN. –Minimal site setup needed Allows site to separately manage & engineer big flows.

Minimal L3 VC service Site decides schedule, bw, and a flowspec: –Source / destination subnets –DSCP bits Zero config needed in either site / app. VC is by default unidirectional Hops onto / off ESnet will take regular IP route

L3 VC service ESnet Confidential

Minimal L2 VC service Site decides destination, bandwidth, VLAN Big flows arrive at a subinterface –Much easier to manage inside the site Site config needed: VLAN plumbing. VC participant sites must arrange routing –ESnet highly recommends use of a dynamic routing protocol for this.

L2 VC service

Expanding SDN

Active SDN endpoint Use case: More than one data intensive application at the site need to use the same network resources. –The site has decided to programmatically schedule and control virtual circuits on SDN. Site configuration: –Should install & configure OSCARS client software –Need to have a DOEGrids certificate and related OSCARS user account

Active SDN endpoint (cont.) Advantage: Good measure of control, better utilization of resources Applications that bring up VCs only when they absolutely are needed –helps bring both site and ESnet networking costs down.

Integrated SDN site Use case: Evolution of the active endpoint, with data intensive applications transparently and dynamically configuring VCs. This usually means that the site hosts and / or network need to be dynamically reconfigured. The site can use a solution like TeraPaths / LambdaStation / Phoebus to automate the process. Can integrate this with overall data and computing workflow

Integrated SDN site (cont.) Advantages: –Almost / fully transparent to applications. –Can do sophisticated scheduling. –Can guarantee QoS inside the site network. The site has almost created its own internal virtual circuit service, stitched to the SDN service Next step: run an IDC!