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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
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Chapter 7 Configuring Stickiness
Stickiness Overview
Sticky Groups
Sticky groups allow the ACE to keep a client stuck to a real server or group of real servers within a server
farm. The ACE uses the concept of sticky groups to configure stickiness. A sticky group allows you to
specify the sticky attributes. After you configure a sticky group and its attributes, you associate the
sticky group with a Layer 7 policy-map action in a Layer 7 SLB policy map.You can create a maximum
of 4096 sticky groups in each context. Each sticky group that you configure on the ACE appliance
contains a series of parameters that determine the following:
• Sticky method
• Timeout
• Replication
• Cookie offset and other cookie-related attributes
• HTTP header offset and other header-related attributes
• Buddy group name
Related Topics
• Stickiness Overview, page 7-1
• Sticky Types, page 7-2
• Sticky Table, page 7-11
• Configuring Sticky Groups, page 7-11
Buddy Sticky Groups
Buddy sticky groups allow the ACE to keep a client stuck to a real server or group of real servers even
when the client requests are processed by different server farms.
To use the buddy sticky group feature, you perform the following steps:
1. Create real server buddy groups when specifying the real servers in a server farm (see the
“Configuring Server Farms” section on page 6-18).
2. Create sticky server farm buddy groups when specifying the server farms in a sticky group (see the
“Configuring Sticky Groups” section on page 7-11). You make each sticky server farm to be buddied
together a group member.
This section describes the following buddy sticky group applications:
• One-to-one association—Sticks the client to the same physical server instances in two different
server farms.
• Asymmetric association—Sticks a client to a real server that is configured across different
serverfarms even when the client comes back with a non-HTTP request or different HTTP header.
• Many-to-one association—Sticks multiple, first-tier real servers to one real server in a second tier
that contains fewer servers.
This section includes the following topics:
• Guidelines and Restrictions, page 7-7
• One-to-One Association Example, page 7-7
• Asymmetric Association Example, page 7-8
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