User`s guide

Redundant License Server Model
In the redundant license server model, you use three servers to authenticate
a single license file. One server acts as the master, while the other two provide
backup if the master server fails. With this configuration, licenses continue
to be monitored and issued as long as at least two servers are still functional.
The license file on all three servers is the same. You must install the Network
License Manager on each server.
In the redundant license server model, all servers must reside on the same
subnet and have consistent network communications. (Slow, erratic, or dial-up
connections are not supported.)
Advantage of the Redundant License Server Model
■ If one of the three servers fails, all licenses that are managed in the server
pool are still available.
Disadvantages of the Redundant License Server Model
■ If more than one server fails, no licenses are available.
■ All three servers must reside on the same subnet and have reliable network
communications. The redundant server pool does not provide network
fault tolerance.
■ If one of the three servers is replaced, the complete redundant server pool
must be rebuilt.
■ If your Autodesk product supports license borrowing and licenses are
borrowed from a redundant license server pool, you must restart the license
server after you stop the Network License Manager.
Learn About Your License
In this section, you learn about license operation and availability, the license
file, license types and behaviors, and the heartbeat signal.
License Operation and Availability
When you start an Autodesk product, the product determines the server from
which it should try to obtain a license. The product then requests a license
through the TCP/IP network protocol to the license server.
Learn About Your License | 17