AP triggered stateless WLAN-GW redundancy (N:1)

Existing AP controlled redundancy, described in Data-triggered subscriber creation, is enhanced to trigger switchover on primary WLAN-GW if the number of WLAN-GW IOMs in the WLAN-GW group fall below number of active WLAN-GW IOMs. Based on a configuration using a configure service ies | vprn service-id subscriber-interface ip-int-name group-interface ip-int-name wlan-gw command, the WLAN-GW group is operationally brought down if a WLAN-GW IOM fails and the number of WLAN-GW IOMs fall below number of active WLAN-GW IOMs configured for the WLAN-GW group. This results in loss of route to the tunnel endpoint from the active WLAN-GW. The AP detects this as WLAN-GW failure, and start tunneling the data to a configured backup WLAN-GW, where the subscriber is created based on data-triggered authentication. This is supported for both ESM and DSM.