SW_MATM-4-MACFLAP_NOTIF flapping between port Gi1/0/21 and port Gi1/0/

[matias-silva]

I am experiencing flap issues on my Cisco 9300 devices. These are connected to 9200 access switches, creating redundancy with two core switches (9300). The access switches have two uplink ports, one connected to each core switch. I have reviewed the spanning-tree, port-channel, and trunk configurations and have not detected any inconsistencies. All devices are provisioned in DNA Center.

When executing a show mac address for the MAC, it is observed that it oscillates between ports 21 and 22. I also checked for multiple MAC addresses on an access port to identify any out-of-standard switches, but nothing was found. No physical loop was detected either.

[MHM Cisco World]

Any update 

MHM

[matias-silva]

The VLAN 126 was completely removed since it is not being used; however, flap logs are still appearing. All switches are running rapid-PVST, but the Layer 2 switches only have the following configuration:

[MHM Cisco World]

VLAN0019 Desg FWD 15 128.20 P2p
VLAN0032 Desg FWD 15 128.20 P2p
VLAN0126 Desg FWD 15 128.20 P2p
VLAN0132 Desg FWD 20000 128.20 P2p

[matias-silva]

It is because the port has MAB/802.1X authentication enabled. When the ISE is removed from the port, the MAC appears as type “Dynamic.”

[MHM Cisco World]

Yes friend I know but host is connect to cat92001 abd appear to flapping between port connect to both cat92002 and cat92003 (21/22)

[MHM Cisco World]

[matias-silva]

diagrama

 

[matias-silva]

Attached is the current topology.

[matias-silva]

sh cdp nei Gig 1/0/20

[matias-silva]

013833: *Aug 20 23:57:20: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013834: *Aug 21 00:05:22: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013835: *Aug 21 00:05:54: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013836: *Aug 21 00:06:06: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013837: *Aug 21 00:07:22: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013838: *Aug 21 00:08:19: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013839: *Aug 21 00:10:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013842: *Aug 21 00:20:48: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013843: *Aug 21 00:21:47: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013844: *Aug 21 00:27:55: %SW_MATM-4-MACFLAP_NOTIF: Host a425.1bc1.ee6a in vlan 132 is flapping between port Gi1/0/22 and port Gi1/0/20
013845: *Aug 21 00:30:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013846: *Aug 21 00:37:14: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013847: *Aug 21 00:40:15: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013848: *Aug 21 00:40:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013851: *Aug 21 00:51:52: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013852: *Aug 21 00:53:29: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013853: *Aug 21 00:57:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013854: *Aug 21 01:00:19: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013855: *Aug 21 01:01:34: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013856: *Aug 21 01:14:36: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013857: *Aug 21 01:15:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013858: *Aug 21 01:15:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013859: *Aug 21 01:16:40: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013862: *Aug 21 01:20:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013863: *Aug 21 01:23:37: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013864: *Aug 21 01:25:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013865: *Aug 21 01:27:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013866: *Aug 21 01:28:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013867: *Aug 21 01:30:09: %SW_MATM-4-MACFLAP_NOTIF: Host a425.1bc1.ee6a in vlan 132 is flapping between port Gi1/0/22 and port Gi1/0/20
013868: *Aug 21 01:30:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013869: *Aug 21 01:30:54: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013870: *Aug 21 01:35:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013871: *Aug 21 01:40:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013874: *Aug 21 01:55:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013875: *Aug 21 01:56:48: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013876: *Aug 21 01:59:32: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013877: *Aug 21 02:00:01: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013878: *Aug 21 02:00:47: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013879: *Aug 21 02:01:47: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013880: *Aug 21 02:02:22: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013881: *Aug 21 02:05:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013882: *Aug 21 02:06:04: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013883: *Aug 21 02:07:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013884: *Aug 21 02:17:41: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013887: *Aug 21 02:23:44: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013888: *Aug 21 02:29:32: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013889: *Aug 21 02:30:21: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013890: *Aug 21 02:35:55: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013891: *Aug 21 02:37:30: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013894: *Aug 21 02:50:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013895: *Aug 21 02:51:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013896: *Aug 21 02:52:32: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013897: *Aug 21 02:55:03: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013898: *Aug 21 03:04:33: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013899: *Aug 21 03:07:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013900: *Aug 21 03:08:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013901: *Aug 21 03:09:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013902: *Aug 21 03:10:15: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013903: *Aug 21 03:10:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013906: *Aug 21 03:20:14: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013907: *Aug 21 03:31:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013908: *Aug 21 03:37:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013909: *Aug 21 03:38:15: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013910: *Aug 21 03:41:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013911: *Aug 21 03:43:07: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013913: *Aug 21 03:48:36: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013915: *Aug 21 03:51:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013916: *Aug 21 03:56:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013917: *Aug 21 04:00:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013918: *Aug 21 04:00:49: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013919: *Aug 21 04:04:21: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013920: *Aug 21 04:05:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013921: *Aug 21 04:06:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013922: *Aug 21 04:15:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013925: *Aug 21 04:20:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013926: *Aug 21 04:23:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013927: *Aug 21 04:25:13: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013928: *Aug 21 04:25:27: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013929: *Aug 21 04:30:56: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013930: *Aug 21 04:33:29: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013931: *Aug 21 04:34:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013932: *Aug 21 04:37:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013933: *Aug 21 04:37:38: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013934: *Aug 21 04:43:47: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013936: *Aug 21 04:49:37: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013938: *Aug 21 04:50:48: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013939: *Aug 21 04:51:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013940: *Aug 21 04:51:41: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013941: *Aug 21 04:51:52: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013942: *Aug 21 04:52:39: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013943: *Aug 21 04:55:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013944: *Aug 21 04:59:38: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013945: *Aug 21 05:06:08: %SW_MATM-4-MACFLAP_NOTIF: Host a425.1bc1.ee6a in vlan 132 is flapping between port Gi1/0/22 and port Gi1/0/20
013946: *Aug 21 05:06:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013947: *Aug 21 05:07:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013948: *Aug 21 05:10:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013949: *Aug 21 05:10:28: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013950: *Aug 21 05:11:55: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013951: *Aug 21 05:15:16: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013953: *Aug 21 05:19:56: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013955: *Aug 21 05:21:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013956: *Aug 21 05:23:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013957: *Aug 21 05:25:32: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013958: *Aug 21 05:30:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013959: *Aug 21 05:35:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013960: *Aug 21 05:40:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013961: *Aug 21 05:45:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013964: *Aug 21 05:50:49: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013965: *Aug 21 05:54:38: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013966: *Aug 21 05:55:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013967: *Aug 21 06:00:05: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013968: *Aug 21 06:04:37: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013969: *Aug 21 06:05:19: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013970: *Aug 21 06:07:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013971: *Aug 21 06:09:09: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
013972: *Aug 21 06:15:25: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013975: *Aug 21 06:20:11: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013976: *Aug 21 06:35:17: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013977: *Aug 21 06:35:29: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013978: *Aug 21 06:37:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013979: *Aug 21 06:40:13: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013980: *Aug 21 06:42:43: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013982: *Aug 21 06:49:33: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013984: *Aug 21 06:50:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013985: *Aug 21 07:00:21: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013986: *Aug 21 07:05:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013987: *Aug 21 07:07:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013988: *Aug 21 07:10:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013989: *Aug 21 07:15:14: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013991: *Aug 21 07:19:35: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013993: *Aug 21 07:20:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013994: *Aug 21 07:20:53: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013995: *Aug 21 07:23:02: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013996: *Aug 21 07:27:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
013997: *Aug 21 07:30:15: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013998: *Aug 21 07:30:31: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
013999: *Aug 21 07:30:34: %SW_MATM-4-MACFLAP_NOTIF: Host a425.1bc1.ee6a in vlan 132 is flapping between port Gi1/0/22 and port Gi1/0/20
014000: *Aug 21 07:35:30: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014001: *Aug 21 07:44:37: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014004: *Aug 21 07:50:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014005: *Aug 21 07:52:23: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014006: *Aug 21 08:00:21: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014007: *Aug 21 08:01:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014008: *Aug 21 08:01:52: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014009: *Aug 21 08:06:08: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014010: *Aug 21 08:06:13: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014011: *Aug 21 08:07:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014012: *Aug 21 08:07:38: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014013: *Aug 21 08:08:30: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014014: *Aug 21 08:10:49: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014015: *Aug 21 08:15:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014018: *Aug 21 08:21:05: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014019: *Aug 21 08:21:40: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014020: *Aug 21 08:21:49: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014021: *Aug 21 08:22:43: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014022: *Aug 21 08:23:03: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014023: *Aug 21 08:25:17: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014024: *Aug 21 08:25:30: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014025: *Aug 21 08:27:43: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014027: *Aug 21 08:30:55: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014028: *Aug 21 08:31:47: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014030: *Aug 21 08:35:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014031: *Aug 21 08:36:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014032: *Aug 21 08:37:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014033: *Aug 21 08:38:16: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014034: *Aug 21 08:39:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014035: *Aug 21 08:40:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014036: *Aug 21 08:40:58: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014037: *Aug 21 08:41:45: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014038: *Aug 21 08:43:04: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014041: *Aug 21 08:51:04: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014042: *Aug 21 08:52:44: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014043: *Aug 21 08:55:49: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014044: *Aug 21 08:59:53: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014045: *Aug 21 09:00:20: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014046: *Aug 21 09:02:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014047: *Aug 21 09:05:30: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014048: *Aug 21 09:05:52: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014049: *Aug 21 09:06:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014050: *Aug 21 09:07:23: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014051: *Aug 21 09:08:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014052: *Aug 21 09:09:39: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014053: *Aug 21 09:10:10: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014054: *Aug 21 09:11:50: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014055: *Aug 21 09:12:04: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014056: *Aug 21 09:12:26: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014057: *Aug 21 09:12:46: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014058: *Aug 21 09:15:08: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014059: *Aug 21 09:15:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014061: *Aug 21 09:18:39: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
014062: *Aug 21 09:19:38: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014064: *Aug 21 09:22:37: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014065: *Aug 21 09:25:07: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014066: *Aug 21 09:25:28: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
014067: *Aug 21 09:29:39: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014068: *Aug 21 09:30:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/20 and port Gi1/0/21
014069: *Aug 21 09:31:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014070: *Aug 21 09:35:36: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014071: *Aug 21 09:35:48: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014072: *Aug 21 09:36:17: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014073: *Aug 21 09:37:39: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014074: *Aug 21 09:38:17: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014075: *Aug 21 09:40:22: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014076: *Aug 21 09:44:56: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014077: *Aug 21 09:47:53: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014080: *Aug 21 09:50:52: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014081: *Aug 21 09:51:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014082: *Aug 21 09:53:06: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014083: *Aug 21 09:54:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014084: *Aug 21 09:58:17: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014085: *Aug 21 10:06:09: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014086: *Aug 21 10:06:16: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014087: *Aug 21 10:09:19: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014088: *Aug 21 10:09:46: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014089: *Aug 21 10:11:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014090: *Aug 21 10:12:18: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014091: *Aug 21 10:12:51: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014092: *Aug 21 10:15:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014095: *Aug 21 10:20:35: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014096: *Aug 21 10:25:07: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014097: *Aug 21 10:25:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014098: *Aug 21 10:25:53: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014099: *Aug 21 10:28:19: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014100: *Aug 21 10:28:36: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014101: *Aug 21 10:29:21: %SW_MATM-4-MACFLAP_NOTIF: Host 24d9.2149.39c5 in vlan 132 is flapping between port Gi1/0/21 and port Gi1/0/22
014102: *Aug 21 10:30:32: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014103: *Aug 21 10:35:34: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014104: *Aug 21 10:35:48: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014105: *Aug 21 10:36:02: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014106: *Aug 21 10:37:24: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014109: *Aug 21 10:38:04: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014110: *Aug 21 10:38:13: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014111: *Aug 21 10:38:36: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
014112: *Aug 21 10:38:47: %SW_MATM-4-MACFLAP_NOTIF: Host c018.0386.af9c in vlan 32 is flapping between port Gi1/0/21 and port Gi1/0/20
 sh clock
*10:40:09.165 SCL Thu Aug 21 2025

[MHM Cisco World]

c018.0386.af9c <<- check this MAC in table of SW9200 1/2

It can ONE Server have two leg connect to both SW

[matias-silva]

sh mac add add
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----

[MHM Cisco World]

SW1_ACCESO_TR_P2C#sh run int Gi1/0/25 <<- what device connect to this port?

MHM

[matias-silva]

There is only one HP computer connected.

sh mac add int GigabitEthernet1/0/25
Mac Address Table
-------------------------------------------

[Jose Suarez]

Hi, 

Did you verify that all the switch were using the same STP(RSTP or rapid-pvst)?

Could you share the "show spanning-tree summary" of the access router too?