There are two pieces in this question. I believe that you are asking related to 2) because you manually shut down the tunnel.
1) Tunnel monitor (reducing the tunnel failover time)
Reduce the Monitor profile 'Interval' and 'Threshold' on the Network -> Network Profiles -> Monitor.
2) OSPF timing (reducing the convergence time)
Reduce the Hello Interval (sec) - by changing the 'Hello Interval' (default: 10 seconds) on the Network -> Virtual Routers -> OSPF.
Hope this helps,
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