We are experiencing EIGRP neighbors flapping quite often. The log shows the below message:
000867: Jan 11 09:59:18.252 AWST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 10.100.1.1 (GigabitEthernet0/1) is down: holding time expired
000868: Jan 11 09:59:25.328 AWST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 10.100.1.2 (GigabitEthernet0/1) is down: holding time expired
000869: Jan 11 09:59:57.400 AWST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 10.100.1.1 (GigabitEthernet0/1) is up: new adjacency
000870: Jan 11 10:00:09.824 AWST: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor 10.100.1.2 (GigabitEthernet0/1) is up: new adjacency
We have one router at the remote site and two routers at the head office. Eigrp configured between all three routers. I have performed the below troubleshooting and I am not able to find the exact cause for EIGRP flapping.
The logs are not showing that the interface went down, so that’s not the cause for the Neighbor flapping
All the three devices has an hello interval of 5 seconds and the hold time is not less than the hello time. It’s 3 x times the hello time
There are no loss of hello packets. I enabled “debug eigrp packets hello” on the remote office router and on the one head office router for 20 minutes. Both routers are sending and receiving hello packets
Tried pinging the neighbors with small packets and then with a large packet [1450 byte] from remote router and vice versa. No drops
Also tried pinging the Multicast address 188.8.131.52 from remote router and vice versa. Getting response from the neighbors
Bandwidth has been set properly on all the device interfaces
The percentage utilization is not high during business hours. But the traffic peaks to approximately 60 to 70% majority of the days between 1.30AM – 3:00AM in the night during backup. But EIGRP is not flapping during that time.
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