Other RIP Issues
In addition to all the reasons why RIP routes might be missing, you may have to troubleshoot issues related to a missing default route or to route summarization.
Missing Default Route
There is a very small chance that a router using RIP will be able to support all 480,000+ summarized Internet routes. Therefore, redistributing the entire BGP routing table into RIP is out of the question. Therefore, for packets sourced in the RIP domain destined to the Internet to be successfully routed, the RIP routers need to know what to do with packets that they do not have a specific match for. This is where the default route enters the picture.
The default route will typically be configured on the edge device with a next-hop address of ...