Alteon Application Switch Operating System Application Guide
Content-Intelligent Server Load Balancing Not Using Layer 7 Content Switching Rules
816
Document
ID:
RDWR-ALOS-V2900_AG1302
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Applications—Identify users by the specific application they are using. For example, priority
can be given to HTTPS traffic that is performing credit card transactions versus HTTP browsing
traffic.
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Content—Identify users by the specific content they are accessing.
Based on one or more of these criteria, you can load balance requests to different server groups.
Configuring Cookie-Based Preferential Load Balancing
To configure cookie-based preferential load balancing
1. Before you can configure header-based load balancing, ensure that Alteon has already been
configured for basic SLB with the following tasks:
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Assign an IP address to each of the real servers in the server pool.
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Define an IP interface.
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Define each real server.
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Assign servers to real server groups.
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Define virtual servers and services.
For information on how to configure your network for SLB, see
Server Load Balancing, page 165
2. Turn on URL parsing for the virtual server.
In this example
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sid is the cookie name
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1 is the offset (the starting position of the value to be used for hashing)
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6 is the length (the number of bytes in the cookie value)
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d looks for the cookie in the cookie header instead of the URI (disables searching for cookie
in the URI)
3. Define the cookie values.
Because a session cookie does not exist in the first request of an HTTP session, a default server
or any server is needed to assign cookies to a None cookie HTTP request.
>> # /cfg/slb/virt 1
>> Virtual Server 1 # service 80
>> Virtual Server 1 http Service # http
>> HTTP Load Balancing# httpslb
>> Application:
>> urlslb|host|cookie|browser|urlhash|headerhash|version|others|none
>> Select Application:cookie
>> Operation: and|or|none
>> Select Operation: ena
>> Enter Cookie Name: sid
>> Enter the starting point of the Cookie value [1-64]: 1
>> Enter the number of bytes to extract [1-64]: 6
>> Look for Cookie in URI [e:d]: d
>> # /cfg/slb/layer7/slb/addstr "Gold"
>> # addstr "Silver"
>> # addstr "Bronze"
