Dell 3-DNS Spezifikationen PDF herunterladen (Seite 116)

Chapter 4: Configuring the High-Level Network

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3. Click the Allow Persistence Across All Ports for Each Virtual

Address check box. (To disable this persistence mode, clear the

check box).

4. Click the Apply button.

To activate persistence for virtual servers that use the

same address from the command line

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

activate the persistence mode, type:

b global persist_across_services enable

To deactivate the persistence mode, type:

b global persist_across_services disable

Maintaining persistence across all virtual servers

You can set the BIG-IP to maintain persistence for all connections requested

by the same client, regardless of which virtual server hosts each individual

connection initiated by the client. When this mode is turned on, the BIG-IP

attempts to send all persistent connection requests received from the same

client, within the persistence time limit, to the same node. Connection

requests from the client that do not use persistence are load balanced

according to the currently selected load balancing mode.

The following examples show virtual server mappings, where the virtual

servers v1:http and v2:http reference the http1_pool and http2_pool (both

pools contain the nodes n1:http and n2:http) and the virtual servers v1:ssl

and v2:ssl reference the pools ssl1_pool and ssl2_pool (both pools contain

the nodes n1:ssl and n2:ssl). Each virtual server uses persistence:

b virtual v1:http use pool http1_pool

b virtual v1:ssl use pool ssl1_pool

b virtual v2:http use pool http2_pool

b virtual v2:ssl use pool ssl2_pool

Say that a client makes an initial connection to v1:http and the BIG-IP load

balancing mechanism chooses n1:http as the node. If the same client

subsequently connects to v1:ssl, the BIG-IP would send the client’s request

to n1:ssl, which uses the same node address as the n1:http node that

currently hosts the client’s initial connection. What makes this mode

different from maintaining persistence across virtual servers that use the

same virtual address is that if the same client subsequently connects to

v2:ssl, the BIG-IP would send the client’s request to n1:ssl, which uses the

same node address as the n1:http node that currently hosts the client’s

initial connection.

In order for this mode to be effective, virtual servers that use pools with

TCP or SSL persistence should include the same member addresses in the

virtual server mappings.

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