Example 749 Configurations for Routers A B C and D in Figure 728

Router A# interface ethernet 0

ip address 10.1.1.1 255.255.255.0 interface serial 0

ip address 10.1.2.1 255.255.255.0

Router B# interface serial 0

ip address 10.1.2.2 255.255.255.0 interface serial 1

ip address 10.1.3.1 255.255.255.0

Router C# interface ethernet 0

ip address 10.1.1.2 255.255.255.0 interface serial 0

ip address 10.1.4.1 255.255.255.0

Router D# interface ethernet 0

ip address 10.1.1.3 255.255.255.0

interface serial 0

ip address 10.1.5.1 255.255.255.0

The problem happens in Router A where the route timer for the route 150.150.0.0/16 in the routing table is constantly at 00:00:00. By looking at Router C, the next hop to the route, you can see that the route is stable and is not flapping. The neighbor relationship in Router A is also stable, and the interfaces on Router A are stable with no signs of interface flapping. The next step is to look at the event log in EIGRP and see which neighbor is updating Router A constantly about the route 150.150.0.0/16. Example 7-50 shows the relevant information in the EIGRP event log on Router A.

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