0x00 导读

Openvswitch是一款开源的openflow switch实现，该项目由Linux Foundation管理。ovs是目前比较主流的的一种实现，除了可以通过Openflow管理，ovs也支持通过ovsdb协议管理。
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0x01 why Open Vswitch

Open Vswitch官方描述

  • 灵活的状态迁移：虚拟机在不同的主机上面迁移，需要保存原先的状态
    • 配置信息，比如vlan，qos等
    • 实时状态信息？
  • 网络拓扑变幻莫测：虚拟机时刻变化速度快，从而导致网络拓扑一直变化
    • ovsdb
    • openflow
  • 逻辑标识的维护：标识虚拟机或者虚拟机域。比如mpls，vlan等
  • 软硬件一体化：Open Vswitch 容易适配到不同的软硬件平台。

    0x01 特性

  • Visibility into inter-VM communication via NetFlow, sFlow(R), IPFIX, SPAN, RSPAN, and GRE-tunneled mirrors
  • LACP (IEEE 802.1AX-2008)
  • Standard 802.1Q VLAN model with trunking
  • Multicast snooping
  • IETF Auto-Attach SPBM and rudimentary required LLDP support
  • BFD and 802.1ag link monitoring
  • STP (IEEE 802.1D-1998) and RSTP (IEEE 802.1D-2004)
  • Fine-grained QoS control
  • Support for HFSC qdisc
  • Per VM interface traffic policing
  • NIC bonding with source-MAC load balancing, active backup, and L4 hashing
  • OpenFlow protocol support (including many extensions for virtualization)
  • IPv6 support
  • Multiple tunneling protocols (GRE, VXLAN, STT, and Geneve, with IPsec support)
  • Remote configuration protocol with C and Python bindings
  • Kernel and user-space forwarding engine options
  • Multi-table forwarding pipeline with flow-caching engine
  • Forwarding layer abstraction to ease porting to new software and hardware platforms

0x02 生态

openvswitch社区除了ovs外还有ovn，ovn作为ovs的补充，用于实现更高层的网络抽象，比如L2 overlay。