In the redundant license server model, three servers are configured to authenticate license files. Licenses can be monitored and issued as long as at least two license servers are still functional. The Network License Manager is installed on each server, and the license file on each server is the same.

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.