Load balancing uses a number of algorithms, called load balancing methods, to determine how to distribute the load among the servers. When a Load balancer is configured to use the token method, it selects a server based on the value of a token extracted from the client request. You can configure the location and size of the token. For subsequent requests with the same token,the load balancer chooses the same server that handled the initial request. As you can imagine, this provides a level of persistence for the client requests.
The following example shows how a Load Balancer works using the token method:
- Requests with “AA” in the URL are sent to Server-1.
- Requests with “BB” in the URL are sent to Server-2.
- Requests with “CC” in the URL are sent to Server-3.
Whether it’s load balancing XenApp servers, iPhone/iPad resources, websites, linux servers, windows servers, e-commerce sites, or enterprise applications, NetScaler is the perfect choice. NetScaler, available as a network device or as a virtualized appliance, is a web application delivery appliance that accelerates internal and externally-facing web application up to 5x, optimizes application availability through advanced L4-7 traffic management, increases security with an integrated application firewall, and substantially lowers costs by increasing web server efficiency.
Citrix NetScaler is a comprehensive system deployed in front of web servers that combines high-speed load balancing and content switching with application acceleration, highly-efficient data compression, static and dynamic content caching, SSL acceleration, network optimization, application performance monitoring, and robust application security. Available as a virtual machine, the NetScaler is perfect for load balancing virtual servers in the datacenter or in the cloud.