Which two techniques can prevent a routing loop after mutual redistribution between OSPF and EIGRP? (Choose two.)
- Enable EIGRP stub routing on all routers
- Configure BFD between all neighbors
- Configure route tagging and filtering based on tags
- Increase the OSPF reference bandwidth
- Use distribute lists to filter redistributed routes
Explanation: According to the sources, mutual (two-way) redistribution between OSPF and EIGRP can introduce routing loops and suboptimal routing.
To prevent these issues, administrators can configure route tagging and filtering based on tags, which involves using route-map statements to attach a numeric tag to redistributed routes and then denying those routes if they attempt to re-enter the original routing domain.
Another effective technique is to use distribute lists to filter redistributed routes, where the distribute-list command combined with an access-list or prefix-list is used to selectively permit or deny specific prefixes during the redistribution process.
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