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Pools

BIG-IP® Reference Guide 4-37

To activate persistence across all virtual servers using the

Configuration utility

1. In the navigation pane, click the System icon.

The Network Map screen opens.

2. Click the Advanced Properties tab.

The BIG-IP System Control Variables screen opens.

3. Click the Allow Persistence Across All Virtual Servers check box

to activate this persistence mode.

4. Click the Apply button.

To activate persistence across all virtual servers from the

command line

The global variable persist_across_virtuals turns this mode on and off. To

activate the persistence mode, type:

b global persist_across_virtuals enable

To deactivate the persistence mode, type:

b global persist_across_virtuals disable

HTTP redirection

Another attribute of a pool is HTTP redirection. HTTP redirection allows

you to configure a pool so that HTTP traffic is redirected to another protocol

identifier, host name, port number, or URI path. For example, if all members

of a pool are unavailable (that is, the members are disabled, marked down,

and have exceeded their connection limit), the HTTP request can be

redirected to the fallback host, with the HTTP reply Status Code 302

Found.

When configuring a pool to redirect HTTP traffic to a fallback host, you can

use an IP address or a fully-qualified domain name (FQDN), or you can use

a special format string included in the BIG-IP. These format strings can also

be used for specifying protocol identifiers, ports, and URIs.

The following two sections describe these two ways of redirecting HTTP

requests. Following these two sections is a description of a related feature,

which allows you to configure a server to rewrite the specified HTTP

redirection.

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Dell 3-DNS Spezifikationen Seite 117