
Chapter 4: Configuring the High-Level Network
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Hash mode
When configured in hash mode, a WTS server does not participate in a
session directory; that is, the server cannot share sessions with other WTS
servers. Hash mode ensures that WTS clients provide data to the BIG-IP to
allow the BIG-IP to consistently connect that client to the same WTS server.
If the client data that BIG-IP requires is not provided, BIG-IP load balances
the connection according to the way that the user has configured BIG-IP for
load balancing.
Passive mode
When configured in passive mode, a WTS server participates in a session
directory, that is, the server can share sessions with other WTS servers.
Passive mode provides a way for BIG-IP to maintain persistent connections
when WTS servers are clustered together. Normally, WTS servers, when
participating in a session directory, map WTS clients to their appropriate
servers. If a client connects to the wrong server in the cluster, the targeted
server checks its client-server mapping and performs a rewrite to the correct
server.
When configured in passive mode, however, a WTS server always rewrites
the connection to the same BIG-IP virtual server, instead of to the correct
WTS server directly. The BIG-IP then sends the connection to the correct
WTS server.
Activating WTS persistence on BIG-IP
To activate WTS persistence on BIG-IP, you must perform three tasks:
◆ Enable TCP service 3389
◆ Create a pool containing all cluster members and specifying the msrdp
persistence type
◆ Create a virtual server that uses the pool
To enable TCP service 3389 from the command line
To enable TCP service 3389, use the following command:
b service 3389 tcp enable
To create a pool with the WTS persistence attribute from
the command line
To create a pool that is configured for WTS persistence and that contains
two members of a WTS cluster, use the bigpipe pool command as in the
following example:
b pool my_cluster_pool persist_mode msrdp { member 11.12.1.101:3389 member
11.12.1.100:3389 }
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