Load Balancing Overview - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - SPU

6.1 Load Balancing Overview

This section describes the background, classification, and basic concepts of load balancing.
Background
With rapid development of the Internet, increasing users and diversified services propose high
requirements for the network performance. To improve the overall performance of the network,
the network bandwidth needs to be increased and the performance of network devices such as
servers and firewalls needs to be enhanced. You can use high-performance servers or increase
the link bandwidth to improve the network performance, whereas the investments are greatly
wasted.
To solve the problem, the load balancing technology is introduced. By performing a load
balancing algorithm, the load balancing technology evenly distributes services to multiple
network devices or links so that the overall performance of the network is improved.
The load balancing technology has the following advantages:
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Classification
The load balancing modes are classified based on different factors:
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High reliability
When one or more network devices or links are faulty, the system automatically switches
services to normal network devices or links so that services are not interrupted. This reduces
network faults and improves the reliability of service processing.
High performance
The load balancing technology evenly distributes services to multiple network devices so
that processing capabilities of network devices are integrated. These network devices
function as a large network device. The capability of the system for processing services is
thus improved.
Extensibility
By using the load balancing technology, you can add network devices or links to a group,
meeting requirements of increasing services. In addition, the service quality is ensured.
Physical location:
Load balancing is classified into global and local load balancing.
– Local load balancing is performed among servers in a server group in the same physical
location.
– Global load balancing is performed among the server groups that are located in different
physical locations and adopt different network structures. Global load balancing is
applied to the following scenario: An enterprise or a group has server sites in multiple
areas and load balancing users can access the nearest server through an IP address or a
domain name so that they can obtain the fastest access speed.
Load balancing object
Load balancing is classified into link load balancing, server load balancing, and firewall
load balancing.
– Link load balancing indicates that load balancing is performed among different links.
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