For example, cisco has static route 0.0.0.0 0.0.0.0 10.0.0.1 (BRI) which is lower priority then rip.(rip is enabled only on ethernet interface) It's getting default route by RIP from another router and that route is active in his routing table, and when it's stops receiving RIP update from another router (for example connection is lost) his own static route becomes active (for example in case of ISDN back-up). So does it send that route by RIP update on his ethernet interface?
From what I am gathering here you are talking about a floating default-gateway. When the default-gateway of better metric goes down the second best metric (refered to as floating) default-gateway takes over.
You can use a floating static route as well.
This will explain what I am talking a bout a little better.
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