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FusionAccess 6.5 F5 Configuration Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Basic Concepts

Basic Concepts

  • Node

A node is a device that processes traffic sent by a load balancer, usually a service server. When a server is added to a load balancing pool, the server is called a node. A node indicates the IP address of the server, such as,, and in the preceding figure.

  • Pool Member

A load balancing pool member is the IP address and port number of the server that processes the request sent by the load balancer, for example,,, and

  • Pool

A group of pool members forms a pool. A pool is associated with a specific virtual server. The traffic flowing to the virtual server is forwarded to the member nodes in the associated load balancing pool. For example, Pool_web contains three members:,, and

  • Virtual Server

A virtual server corresponds to a virtual address and a port number. A virtual server is a visible and routable entity. A client sends requests to a virtual server, that is, requests a certain type of service. After the association between a virtual server and a load balancing pool is established, the requests destined for a virtual server are forwarded to the nodes in the associated load balancing pool. The nodes respond to the requests from the client. For example, is a virtual server.

The request from the client first is forwarded to the virtual server, and then to the corresponding pool member according to the corresponding pool in the virtual server.

  • Load Balance Method

A load balance method defines how a virtual server forwards a request from the client to the specific pool member. The load balance method is configured in the pool. Load balance methods include Round Robin, Ratio, Fastest, Least Connections, Least Sessions, and more.

  • Persistence

Session persistence means that a load balancer can ensure that a series of associated access requests from the same client are allocated to the same load balancing pool member. The session persistence method is configured in the virtual server. Session persistence methods include Source address, Cookie, Destination address, Hash, SIP, SSL, and more.

  • Health Check (Monitor)

Health check (Monitor) is used to check the health status of member nodes in a load balancing pool. If the services of a member node in the pool are interrupted, the BIG-IP redirects the traffic to other members. Monitor methods include pinging the IP address of a member, checking whether the port of a member is enabled, and simulating the client to send a real service request.

Updated: 2019-05-30

Document ID: EDOC1100062218

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