02-13-2019 04:31 AM
Feb 13 11:52:38.554: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::2 (Ethernet0/0) is down: holding time expired
*Feb 13 11:52:46.255: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::1 (Ethernet0/0) is up: new adjacency
*Feb 13 11:52:50.946: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::2 (Ethernet0/0) is up: new adjacency
*Feb 13 11:53:01.260: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::1 (Ethernet0/0) is down: holding time expired
*Feb 13 11:53:01.262: EIGRP: Build goodbye tlv for FE80::1
*Feb 13 11:53:05.955: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::2 (Ethernet0/0) is down: holding time expired
*Feb 13 11:53:27.259: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::1 (Ethernet0/0) is up: new adjacency
*Feb 13 11:53:32.060: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::2 (Ethernet0/0) is up: new adjacency
*Feb 13 11:53:42.267: %DUAL-5-NBRCHANGE: EIGRP-IPv6 100: Neighbor FE80::1 (Ethernet0/0) is down: holding time expired
*Feb 13 11:53:42.276: EIGRP: Build goodbye tlv for FE80::1
02-13-2019 04:32 AM
02-13-2019 04:33 AM
02-13-2019 05:34 AM
02-13-2019 07:34 AM
Your attachment R2 Neighbors shows a different interface for the adjacency (E0/1) from the flapping interface (E0/0) and the your topology drawing.
1. R2 Neighbors shows int E0/1 with link-local FE80::1 and not E0/0
2. Can you confirm that all the interfaces on the 2 switches are on Vlan 23, as your diagram only shows vlan 23 for one switch
Can you post the Eigrp neighbor for R3?
02-13-2019 08:08 AM
It is not clear to me which device generated the log messages in the original post. But a couple of things are clear.
- this device sees 2 neighbors on its Ethernet interface.
- each this device receives a message from a neighbor and attempts to establish a neighbor relationship.
- 15 seconds later the device marks the neighbor as down because of hold time.
- after a short amount of time the cycle repeats.
Can we see from at least one of those neighbors what they think is going on?
HTH
Rick
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