Question

An engineer redistributes OSPF into EIGRP on a border router (R1) with the command 'redistribute ospf 1 metric 100000 100 255 1 1500'. After the redistribution, downstream EIGRP routers receive all the OSPF intra-area and inter-area routes, but the connected subnets directly attached to R1's OSPF-facing interfaces are NOT appearing in the EIGRP topology table on the neighbors. The OSPF process on R1 shows these interfaces as up and participating. What is the most likely cause?

Accepted Answer

The redistribution of OSPF into EIGRP does not include the connected interfaces running OSPF; those must be redistributed separately with 'redistribute connected'.

Answer

EIGRP requires the 'subnets' keyword on the redistribute command to include subnetted OSPF routes.

Answer

The seed metric values provided are invalid, causing EIGRP to reject only the connected subnets while accepting learned OSPF routes.

Answer

Auto-summary must be disabled with 'no auto-summary' before EIGRP will advertise connected subnets learned via redistribution.