Wan Latency is one of the Switch Health network parameters available in the Service Level Agreements (SLEs):

WAN Latency represents purely the internet latency (delay between the switch and the cloud through the ISP).

- It is calculated based on the round-trip time (RTT) value of packets sent from the switch toward the Mist cloud. 

- It can also be seen as the connection state between of the switch with the oc-term/jma-term.

- PLM It considers it poor if it goes below 85%.

- If WAN latency goes below 85% and there's no evident errors in the network such as drops, errors, uplink flaps, high cpu, asymmetric routing, etc. Customer’s should verify further with their ISP.

- The color also represents whether the connection is it is good or bad. (Green is good. If it falls under 85% it’ll become orange).

- Running the below command, for a few hours, is a good step for identifying slowness or issues on a per L3 hop basis:

traceroute monitor x.x.x.x     <-- x.x.x.x being the public IP of the cloud