Exhibit.

For an ADVPN spoke configuration shown, the corresponding hub must have auto-discovery-sender enabled to send shortcut advertisement messages to the spokes. Also, the hub would need to have auto-discovery-forwarder enabled if it is to forward on those shortcut advertisements to other spokes. This allows the hub to inform all spokes about the best path to reach each other. The ike-version does not need to be reconfigured on the hub if it's already set to version 2 and auto-discovery-receiver is not necessary on the hub because it's the one sending the advertisements, not receiving.