notes: Troubleshooting EIGRP Redistribution Problems

In many instances, a problem occurs when redistributing from another routing protocol into EIGRP.


scenario1:  the router is the border router between three routing protocols, RIP, OSPF, and EIGRP.

Router A wants to redistribute all the routes in the RIP domain into the EIGRP domain. The problem is that the network 150.150.0.0/16 is not getting redistributed into the EIGRP domain.

debugs and verification:

show ip eigrp topo  150.150.0.0 255.255.255.0

 show ip route 150.150.0.0 255.255.0.0 -shows it was learned via ospf, since ospf has a lower admin distance than rip. the route via ospf was used.

solution:

The resolve this problem, you must make Router A install the RIP route instead of the OSPF route. One way to do this is to configure a distribute list under OSPF to not install the 150.150.0.0/16 route.

Scenario2: redistributing other protocols to eigrp without default metric command.

although the redistribute ospf  command is configured under EIGRP, there is no configuration of the default-metric command. When redistributing between different routing protocols, the default-metric com-mand must be configured. When one routing protocol is being redistributed into another, the router doesn't have a way to translate the routing metric from one routing protocol into another. The default-metric command is used so that the network administrator can manually initialize the routing metric during route redistribution.

solution:
 The fix for this problem: Configure a default metric under EIGRP in Router B.