Without knowing a bit more about the topology of the network, it is difficult to say exactly what is going on. The error message that holding time expired is an indication that your router has sent EIGRP traffic to the neighbor (probably EIGRP HELLO messages) and has not received a response and so will terminate the neighbor relationship and wait till it has received a HELLO from the neighbor before it rebuilds the neighbor relationship.
Looking at the messages and their timestamps we can see that there is this sequence:
- 11:45:56 neighbor is up
- 21:26:37 neighbor is down (so it was up for 9 hours and 40 minutes)
- 21:27:00 neighbor is up (so it was down for 23 seconds)
- 3:52:16 neighbor is down (so it was up for 6 hours 25 minutes)
- 9:44:17 neighbor is up (so it was down for 5 hours 52 minutes)
So one of the incidents was very short and one was not. Without more information it is difficult to figure out what is going on. What is the connection to this neighbor? Are there signs of similar issues on the neighbor? Are there signs that there was any problem in the connection between the neighbors (especially in the problem that lasted over 5 hours)?
 and unless there is a particular reason to hard code speed and duplex I believe that with todays equipment it is usually better to set speed and duples as auto.
Perhaps "response" was not the optimum choice of words. In establishing the EIGRP neighbor relationship the routers establish a time interval in which they need to hear EIGRP protocol traffic from the neighbor (typically HELLO messages) and they use the holding timer to track this. If the holding timer expires before the router receives EIGRP protocol traffic then it terminates the neighbor relationship.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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