Specifications

Pools
BIG-IP® Reference Guide 4-35
To create a virtual server from the command line
To create a virtual server that uses the pool my_cluster_pool, use the
bigpipe virtual command as in the following example:
b virtual 192.200.100.25:3389 use pool my_cluster_pool
Maintaining persistence across virtual servers that use the same virtual addresses
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 only when the virtual server hosting the
connection has the same virtual address as the virtual server hosting the
initial persistent connection. Connection requests from the client that go to
other virtual servers with different virtual addresses, or those connection
requests that do not use persistence, are load balanced according to the load
balancing mode defined for the pool.
If a BIG-IP configuration includes the following virtual server mappings,
where the virtual server v1:http references the http_pool (contains the
nodes n1:http and n2:http) and the virtual server v1:ssl references the pool
ssl_pool (contains the nodes n1:ssl and n2:ssl). Each virtual server uses
persistence:
b virtual v1:http use pool http_pool
b virtual v1:ssl use pool ssl_pool
b virtual v2:ssl use pool ssl_pool
However, if the client subsequently connects to v1:ssl, the BIG-IP uses the
persistence session established with the first connection to determine the
node that should receive the connection request, rather than the load
balancing mode. The BIG-IP should send the third connection request to
n1:ssl, which uses the same node address as the n1:http node that currently
hosts the client's first connection with which it shares a persistent session.
For example, a client makes an initial connection to v1:http and the load
balancing mechanism assigned to the pool http_pool chooses n1:http as the
node. If the same client then connects to v2:ssl, the BIG-IP starts tracking a
new persistence session, and it uses the load balancing mode to determine
which node should receive the connection request because the requested
virtual server uses a different virtual address (v2) than the virtual server
hosting the first persistent connection request (v1). In order for this mode to
be effective, virtual servers that use the same virtual address, as well as
those that use TCP or SSL persistence, should include the same node
addresses in the virtual server mappings.
To activate persistence for virtual servers that use the
same address using the Configuration utility
1. In the navigation pane, click System.
The Network Map screen opens.
2. Click the Advanced Properties tab.
The BIG-IP System Control Variables screen opens.