im attempting a lab to allow dial-backup in the even of a primary link failure. it is working fine but i wanted to find out if there was a way to allow the backup connection to detect the link failure and automatically dial using the backup interface. for instance object tracking on the interface i desire
i have everything working so far. the issue now is that there is no consistency. i will get the automatic dialout when i down the primary interface, but when i connect the main interface again and bring it back down, the modem doesnt dial. debugs show that modem hangs up and is in idle state everytime
03:25:58: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
03:26:00: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down
Sounds like the router portion is working as expected. Modems can be tricky. I've had similar problems in the past. Sounds like the modem is not configured properly. Perhaps it is not hanging up after it dials?
Does the modem dial and connect the first time that you down your primary connection? If it does, is it just that it fails the second time around?
Take a look at these modem AT codes which I found very helpful when I had to install dial up access:
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