The are two links ( fast ethernet and ADSL) at central office to Internet. Remote offices use fast ethernet and ADSL also to get on Internet. All links are from different providers. The task is to use ADSL as a backup link in case local ethernet link is down or local provider has problem in his cloud so we cannot connect central office ethernet interface and if still disconnected try to connect to central office ADSL.
Which feature or technology could be used in this case.
if you want to look down in some simple easier config scenario would suggest to have 2 GRE Tunnels one over the primary link (over the ethernet) and the other tunnel over the secondary (ADSL).
But do remember to have keepalives supported in your GRE interfaces which is very much reqd to route the traffic over the secondary tunnel when theres some reachability probs over the ethernet link and to make your primary GRE interace down.
Otherwise you wont be able to achieve the reduandcy or standby kinda config without the keepalives.
or else you can give a try using object tracking method.
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