SDN之父Nick教授力推的可编程数据平面人尽皆知
配合如此灵活的硬件需要一款强大的NOS，看完下面的交换机网络操作系统特性就明白为什么P4平台被称为SDN 2.0：
Supports Barefoot Tofino based networking hardware with throughput of up to 6.5 Tbps
Fully programmable OpenFlow 1.3/1.4/1.5 pipeline with up to 9 flow tables supporting wildcard or exact match flow table entries. Maximum table size varies depending on the size of the flow entries
The maximum flow table size varies depending on the size of all of the flow tables, the group table, the meters to be defined in the system, the associated match-fields and the actions, all of which share a common memory space:
Up to 100,000 32b wild card match flow entries in a single table with a simple output to port action
Up to 300,000 48b exact match flow entries in a single table with a simple output to port action
Up to 100,000 meters can be defined in meters table
Up to 100,000 entries can be defined the group table
Up to 100,000 buckets can be defined, with max of 15 buckets per group
The number of match fields, actions, group-actions, and hash-match fields is limited by available memory only
Intel x86 host processor software optimized for maximum flow-mods/second performance
这些在博通平台上备受诟病的OpenFlow特性在Tofino平台上被NOS轻松拆招，交换机支持的软件特性如下：
不是三四百万
不是三四十万
真的只要998万
业界高端硬件工艺
99大软件功能
传统协议不要钱
OpenFlow功能不要钱
真的SDN哦！
不要再犹豫了
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