Stuck in Active Example

Bouter E^shu* ip pigrp topology Active

IP-EIÛRP Topology Table for Aâ(1)/ID(1Û>1.5.2) J 10.1.5.0^4

The output for show ip eigrp topology active didn't show anything for Router E. This indicates that, as far as Router E is concerned, there are no routes in active state. Now you should Telnet back to Router D to double-check whether the router is still in the active state for route 20.2.1.0/24. Telnetting back to Router D shows that Router D is still in active state for route 20.2.1.0/24, but Router E doesn't have any routes in active state. What's going on?

To summarize what has been going on so far, the chain of event is as follows:

1. Router A went active for route 20.2.1.0/24 and is waiting for Router B to reply to the query.

2. Router B can't reply because it is waiting for Router D's query response.

3. Router D can't reply because it is waiting for Router E to reply to the query.

4. Finally, the show ip eigrp topology active command in Router E shows that Router E does not think that any routes are active, while going back to Router D shows that the route 20.2.1.0/24 is still in active state.

From this sequence of events, you can see that there is clearly a discrepancy between Router D and Router E. More investigation is needed between these routers.

A look at Router D and Router E's router CPU utilization and memory usage doesn't show a problem. Both routers' CPU utilization and available memory are normal. You need to look at Router D's neighbor list to see if there is a problem with the neighbors. Example 7-12 shows Router D's EIGRP neighbor list.

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