Alteon Application Switch Operating System Application Guide
Server Load Balancing
Document ID: RDWR-ALOS-V2900_AG1302 231
— Request 5 comes in with a "Titanium" cookie; it is load balanced between servers in Group
15 (Real Servers 1 through 10), and because it does not contain an exact cookie match, it
uses the fallback action.
Browser-Smart Load Balancing
HTTP requests can be directed to different servers based on browser type by inspecting the
"User-Agent" header. For example:
GET /products/Alteon/ HTTP/1.0
User-agent: Mozilla/3.0
Accept: text/html, image/gif, image/jpeg
This also enables content-based load balancing based on device type (for example, laptop versus
mobile phones), as each device type uses unique browser types. Since the list of browser user
agents is quite extensive, it might be hard to manage and update them. To facilitate this kind of list
referencing, using a content class enables nesting classes in a logical expression as part of the class.
Example Browser-Smart Load Balancing
• HTTP Class1—Includes a list of user-agents to match laptops and desktops.
• HTTP Class2—Includes a list of user agents to match mobile phones.
• HTTP Class3—Matched with URL my-site.com AND class1 and performs SLB using Server Group
1, providing regular web site content.
• HTTP Class4—Matched with URL my-site.com and class2 and redirects request to the
mobile-phone specific version of the Web site located at mobile.my-site.com.
• HTTP Class5—Matched with URL mobile.my-site.com and performs SLB using Server Group 2
which contains the optimized "mobile" version of the web site.
To enable Alteon to perform browser-smart load balancing
This procedure is based on Example Browser-Smart Load Balancing, page 231.
1. Before you can configure browser-based load balancing, ensure that Alteon is configured for
basic SLB with the following tasks:
— Assign an IP address to each of the real servers in the server pool.
— Define an IP interface.
— Define each real server.
— Assign servers to real server groups (Group 1 and Group 2).
— Define virtual servers and HTTP services.
2. Configure Class1 called "desktop-browsers" to match laptop or desktop browsers. In this
example, Internet Explorer version 7 and later and Firefox are matched:
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