In the Huawei HCIA-Cloud Computing curriculum, specifically under the "Network Technology Basics" module, Open vSwitch (OVS) is introduced as a key component of software-defined networking (SDN). The primary technology used by OVS for remote access to its control plane and for the programmatic control of traffic flows is OpenFlow.5 OpenFlow is a standard communications protocol that allows an SDN controller (the "brain" of the network) to interact with the forwarding plane (the switch) of a network device.
OpenFlow enables "traffic control" by allowing the controller to define specificflow rules.6These rules tell the switch exactly how to handle packets based on various criteria such as source MAC, destination IP, or TCP port. Instead of the switch making local, autonomous decisions (as a traditional switch does), OVS uses OpenFlow to receive instructions from a centralized management layer. This is how Huawei’s cloud infrastructure achieves "remote access" for network orchestration; an administrator can change the network behavior of thousands of virtual machines across multiple physical hosts by pushing new OpenFlow tables from a central controller.
WhileOVSDB(Option B) is also a critical protocol for OVS, its primary role is to manage theconfigurationof the switch (such as creating bridges, adding ports, or setting up tunnels), rather than the "traffic control" or "flow steering" handled by OpenFlow.BFD(Option C) is used for link failure detection, andNQA(Option D) is a Huawei-specific tool for measuring network performance. In the context of the HCIA exam, OpenFlow is the correct answer for the protocol that enables the intelligent, remote management of data paths in a virtualized network environment.
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