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Example Analysis of Direct connection and Bypass configuration Mode in F5 load Balancer

2025-01-21 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >

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This article mainly shows you "example analysis of direct connection and bypass configuration modes in F5 load balancer". The content is easy to understand and clear. I hope it can help you solve your doubts. Let me lead you to study and learn the article "example Analysis of Direct connection and Bypass configuration modes in F5 load Balancer".

F5 has two common access modes: direct connection and bypass. How to choose the access configuration mode in the specific environment, first let us have an understanding and understanding of these two modes.

First of all, look at the structure of the two modes.

1. Directly connected mode structure

Structure description: the Bigip in the figure is an F5 load balancer device. The public ip address is used on the bigip, and the private ip address is used on the server with the load balancer under the bigip. However, the public ip is used to provide services.

2. Bypass mode structure

As shown in the figure above, the traffic between bigip and the client is on the uplink interface of bigip, and the traffic between bigip and the server is on the interface below.

Take a look at the direction of traffic in bypass mode, as shown in the figure

In bypass mode, using npath traffic processing, all server response traffic can not pass through the bigip, which can greatly reduce the pressure on the traffic on the bigip. However, the traffic handling mode of npath does not work in directly connected mode.

5. During the follow-up system transformation, the work complexity of the two modes is not the same.

If a system without load balancing technology is reformed, then, in the case of a direct connection, the ip address of the server needs to be modified and the network structure needs to be adjusted (the server is transferred to the bigip backend). At the same time, the associated applications also need to be changed, and strict testing is required before they can be run online. However, in the bypass mode, only the gateway of the server needs to be changed, and the rest of the original system (including the network structure) basically does not need to be changed, so the former makes greater changes to the system, while the latter makes less changes.

Finally, summarize the main advantages of the side-hanging mode in the system architecture compared to the directly connected mode:

1. Increase the flexibility of the network: if F5 adopts the way of side-hanging, the gateway of the back-end server points to the address of the layer 3 switch, not the address of F5. When maintaining the network equipment, it is convenient to modify the route to make the equipment offline and easy to maintain and manage. At the same time, some special applications can also point to specific network devices by means of policy routing on the core switch.

2. Improve the reliability of the network as a whole: due to the existence of bypass mode, if there is a problem with the F5 device, the route can be modified on the switch and the data flow can be used to bypass F5 without affecting the whole business system.

3. For some special applications, the speed is improved: after using bypass, some specific application data that are sensitive to speed and delay can take different paths when entering and leaving, for example, they can go through F5 devices when they inflow, check them, and load balance. When the data stream leaves, it does not pass through F5 to improve its speed.

The above is all the contents of the article "sample Analysis of Direct connection and Bypass configuration modes in F5 load Balancer". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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