Will this allow interface fa0 to reclaim it's role as the outgoing interface if it happens to come back up.
The thing is, is that the outgoing interface might remain up but, the Internet connection might be down. So, I believe there is much more involved in making a back up 3G interface. For instance, shouldn't I be using an SLA to continuously monitor the connection to the headend router( I didn't mention that this would be a DMVPN) so, if the headend is not reachable anymore via the fa0 interface then, the 3G will kick take over.
Anyway, backup is rather old command and performs reliable job (with fixed interfaces for me so far). I have just come across bug-like behaviour yesterday, searching here now for some tips before even contacting TAC, when 3G does not probably attach (have not studied detailed stuff) to the network upon primary link failure, even though there is active LAN traffic pushed into the WAN. I started off with backup cmd yesterday, possibly today to play with EEM to see if explicit shut/unshut of Cellular interface works 100% - if it does not work, then I turn to TAC. Any prompt hints from 3G skilled people are welcome, thanks.
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