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Failover Tunnel Timers

You can use the failover timer to determine the time span for which an access point (AP) waits before it fails over to another Juniper Mist Edge device.

APs tunnel traffic to multiple edge devices, by adjusting the failover timers for each tunnel. You can therefore fine-tune the performance of the VLANs that carry application-sensitive data between the AP and the Juniper Mist Edge device.

Note:

Do not configure a very aggressive failover timer if the network experiences latency and packet loss.

You can refer to the following table to configure tunnel timers for a Juniper Mist tunnel.

Table 1: Recommended Timers
Timers Hello Interval Retries Total Time before Failover (Worst Case)
Aggressive

15

4

Approximately 30 seconds

(15 seconds +1+2+4+8)
Default

30

4

Approximately 45 seconds

(30 seconds+1+2+4+8)

Hello interval is used as a heartbeat to detect if a tunnel is alive. It ranges from 0.5 second through 300 seconds. The default vlaue for the hello interval is 60 seconds.