Question

A network engineer is redistributing OSPF routes into EIGRP on a border router using the command 'redistribute ospf 1' under the classic EIGRP process. After the change, none of the OSPF-learned routes appear in the EIGRP topology table on neighboring routers, though the OSPF routes are present in the RIB of the border router. The engineer confirms EIGRP adjacencies are up and the OSPF process ID is correct. What is the most likely cause?

Accepted Answer

The redistribute command is missing a metric, so the routes are assigned an infinite (unreachable) EIGRP metric and are not advertised.

Answer

EIGRP requires a route-map to permit external routes before they can be redistributed into the topology table.

Answer

The administrative distance of external EIGRP (170) is higher than OSPF (110), so the routes are suppressed.

Answer

Auto-summary must be disabled before OSPF routes can be redistributed into EIGRP.