1、picOS：
支持白盒交换机列表：http://www.pica8.com/products/hardware-compatibility-list
特点：
- A Layer-2 protocol stack featuring MLAG
- Full Layer-3 protocol support including OSPF, BGP and multicast
- Support for OpenFlow, OVSDB, and key SDN protocols
- Integration with market-leading SDN controllers including HP VAN, ONOS, OpenDaylight, and Ryu
- Simple device provisioning and management via ZTP, CLI, DevOps automation tools, and a standard Linux shell
Founded by engineers who created and reliably operated some of the largest data center networks on the planet by adopting open networking principles, SnapRoute is dedicated to bringing simplicity, reliability, and white-box economics to data center networks everywhere. SnapRoute’s FlexSwitch software runs on industry standard white-box switches, providing all management and networking functionality through an innovative architecture that simplifies the networking stack and dramatically reduces the code bloat typical of incumbent products. SnapRoute makes it easy to automate network provisioning while giving unprecedented visibility into how the network is running. SnapRoute is backed by Norwest Venture Partners, Lightspeed Venture Partners, AT&T, and Microsoft.
源代码：https://github.com/OpenComputeProject/OpenNetworkLinux
Open Network Linux is a Linux distribution for "bare metal" switches, that is, network forwarding devices built from commodity components. ONL uses ONIE to install onto on-board flash memory. Open Network Linux is a part of the Open Compute Project and is a component in a growing collection of open source and commercial projects.
4、todo