Cisco Explorer 4700 Installation Guide Page 138

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5-2
Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
OL-26645-02
Chapter 5 Configuring Virtual Servers
Configuring Virtual Servers
Sticky groups—See Configuring Sticky Groups, page 7-11.
Parameter maps—See Configuring Parameter Maps, page 8-1.
For information about SLB as configured and performed by the ACE appliance, see the following topics:
Configuring Virtual Servers, page 5-2
Load-Balancing Predictors, page 6-2
Real Servers, page 6-3
Server Farms, page 6-5
Configuring Health Monitoring, page 6-39
TCL Scripts, page 6-40
Configuring Sticky Groups, page 7-11
Configuring Virtual Servers
In a load-balancing environment, a virtual server is a construct that allows multiple physical servers to
appear as one for load-balancing purposes. A virtual server is bound to physical services running on real
servers in a server farm and uses IP address and port information to distribute incoming client requests
to the servers in the server farm according to a specified load-balancing algorithm.
You use class maps to configure a virtual server address and definition. The load-balancing predictor
algorithms (for example, round-robin, least connections, and so on) determine the servers to which the
ACE sends connection requests.
For more information about virtual servers and the ACE Appliance Device Manager, see the following
topics:
Understanding Virtual Server Configuration and ACE Appliance Device Manager, page 5-2
Information About Using Device Manager to Configure Virtual Servers, page 5-5
Virtual Server Configuration Procedure, page 5-7
Understanding Virtual Server Configuration and ACE Appliance Device
Manager
The ACE Appliance Device Manager Virtual Server configuration interface, an abstraction of the
Modular Policy CLI, simplifies, reorders, and makes more atomic the configuration and deployment of
a functional load-balancing environment. With simplification or abstraction, some constraints or
limitations are necessarily introduced. This section identifies the constraints and framework used by
ACE Appliance Device Manager for virtual server configuration.
In ACE Appliance Device Manager, a viable virtual server has the following attributes:
A single Layer 3/Layer 4 match condition
This means that you can specify only a single IP address (or single IP address range if an IPv4
netmask or IPv6 prefix length is used), with only a single port (or port range). Having a single match
condition greatly simplifies and aids virtual server configuration.
A default Layer 7 action
A Layer 7 policy map
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