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switch.arista.Arista-and-SDN.md

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Arista and SDN - Programmable but not Overlay

techtarget.com/Arista-and-SDN

  • Arista provide network programmability via EOS (Extensible OS).

  • Every process talk with via DB. It's a pub-sub model in EOS.

  • Instead of Overlay Controller mode of SDN it allows network to be s/w definable.

  • Communications baked in

  • HP/IBM management platforms where network is managed like storage and compute
  • VMWare VSphere/vCloud platforms that map port profile to virtualization
  • OpenStack

  • EOS got Extensible APIs to talk to any management platform.

  • Arista will distribute OpenFlow Protocols in switch, then OpenFlow Controller can manage multiple switches.

  • System database is built on Linux, people can access it and write their own extensions for EOS.

  • For programmability, Arista introduced first application switch FPGA (Field Programmable Gate-Array).

  • (Currently) people using Arista have to dedicate an application and server to get performance they need. Increases hops and thus latency.

  • With FX [application switch], can have consistent switching apps right on FPGA and reduce latency.

  • Over-subscribed enterprisey 3-tier Network Topology is gone, condensed to 2-tier.

  • With VXLAN one can cross Layer-2 and Layer-3 boundaries and build an extremely large virtual and physical network.

  • VXLAN protocol allows to scale from 4K to 16mil VLANs.