Configure redundancy on ExtremeCloud IQ Controller by configuring GRE tunneling mode for a VLAN with multiple Tunnel Concentrator instances (up to three). You can then assign the VLAN to one or more WLAN networks.
The AP attempts to send traffic for that VLAN to the highest ranked Tunnel Concentrator instance. If that connection fails, the AP attempts to connect to the second higest ranked instance, and if that connection fails, the AP attempts the third instance. The priority ranking depends on whether you also select load balancing:
If load balancing is selected — The priority ranking of the three Tunnel Concentrator instances is selected randomly to ensure that the traffic load gets balanced evenly across the instances.
If load balancing is not selected — The first Tunnel Concentrator instance in the list is given the highest priority ranking followed by the second instance and then the third instance.
Note
ExtremeCloud IQ Controller must be configured to allow an ICMP ping between the access point and the controller. The ping is required for tunnel failover to work.See the following illustration for a redundancy setup example that uses ExtremeCloud IQ Controller as the management application. This example uses three Tunnel Concentrator instances that are spread across three Universal Compute Platform boxes.
