In the 2020 SD-WAN deployment guide, https://www.cisco.com/c/en/us/td/docs/solutions/CVD/SDWAN/cisco-sdwan-design-guide.pdf, it is mentioned that "LTE is used frequently as a transport choice and can be deployed in active mode or as a circuit of last resort, which doesn’t become active unless all other transports become unavailable."
In this last resort configuration, the control and data traffic appear down.
For those deploying this LTE as a backup only:
How are you monitoring your LTE connections to ensure they're usable for SDWAN when needed?
Is it enough to monitor your Cellular0/X/X interface is UP?
Thanks.
