we have a Cisco 2921 with two Internet connections:
The primary connection is a DSL link on an EHWIC-VA-DSL-A, the backup a UMTS/LTE connection on a EHWIC-4G-LTE-G.
In case the DSL link fails, an automated failover to the second (UMTS/LTE) connection should happen.
Can anyone please provide a best practice configuration example? I´m not sure if the basic IP SLA mechanisms (tracking) are sufficient, or if i have to combine this with the "backup interface" command.
interface ATM0/0/0.1 point-to-point
backup interface Cellular0/1/0
pppoe-client dial-pool-number 1