Tunnel Concentrator supports tunnel redundancy and failover between multiple instances of the application. Redundancy ensures that tunneling services remain active even if a Tunnel Concentrator instance fails, or if the server on which the application is installed goes down.
Redundant Tunnel Concentrator instances must be in the same network segment with layer 2 connectivity so that services are not affected by a server failure. As a best practice, use instances that are installed on different physical Universal Compute Platform boxes so that a server failure affects only a single instance.
Redundancy configuration and functionality depend on whether you use or ExtremeCloud IQ or ExtremeCloud IQ Controller as the management entity. The subsequent sections describe the redundancy configurations for each deployment type.