Cisco 3850 - Vlan Flapping Between Port Error

Quintin.Mayo · ‎02-01-2019

Hi,

We have a 3850 switch that is reporting the below Vlan flapping error on multiple trunk interfaces. When researching this error I found a bug for this model with the exact symptoms but for port-channels. The bug CSCut87285 inform this is seen on 3850 stacks running 03.06.00E or later. The switch is running IOS cat3k_caa-universalk9.SPA.03.07.04.E.152-3.E4.bin which falls within the IOS range for this issue according to the bug documentation. My questions is since the bug inform of port channels does this apply to trunk ports as well? Since everything else matches per the documentation I believe this apply. Any confirmation would be greatly appreciated.

System

version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
service compress-config
!
hostname 3850-CORE1
!
boot-start-marker
boot system switch all flash:cat3k_caa-universalk9.SPA.03.07.04.E.152-3.E4.bin

Logs

*Jan 29 16:03:52.201: %SW_MATM-4-MACFLAP_NOTIF: Host 7081.eb5d.a0ac in vlan 130 is flapping between port Gi2/0/10 and port Te1/0/6
*Jan 29 16:03:52.300: %SW_MATM-4-MACFLAP_NOTIF: Host 7081.eb5d.a0ac in vlan 130 is flapping between port Gi2/0/10 and port Te1/0/6 (KAH-3850-CORE1-1)
*Jan 29 16:04:37.261: %SW_MATM-4-MACFLAP_NOTIF: Host 544e.9001.6945 in vlan 120 is flapping between port Gi3/0/8 and port Gi3/0/7
*Jan 29 16:04:37.284: %SW_MATM-4-MACFLAP_NOTIF: Host 544e.9001.6945 in vlan 120 is flapping between port Gi3/0/8 and port Gi3/0/7 (KAH-3850-CORE1-1)
*Jan 29 16:05:14.077: %SW_MATM-4-MACFLAP_NOTIF: Host a0d7.9558.fc3d in vlan 130 is flapping between port Gi2/0/25 and port Gi3/0/24
*Jan 29 16:05:14.164: %SW_MATM-4-MACFLAP_NOTIF: Host a0d7.9558.fc3d in vlan 130 is flapping between port Gi2/0/25 and port Gi3/0/24 (KAH-3850-CORE1-1)
*Jan 29 16:06:37.475: %SW_MATM-4-MACFLAP_NOTIF: Host 0878.0816.4924 in vlan 120 is flapping between port Te1/0/5 and port Te1/0/7
*Jan 29 16:07:54.790: %SW_MATM-4-MACFLAP_NOTIF: Host c01a.da84.633b in vlan 130 is flapping between port Gi2/0/9 and port Gi3/0/11
*Jan 29 16:07:54.885: %SW_MATM-4-MACFLAP_NOTIF: Host c01a.da84.633b in vlan 130 is flapping between port Gi2/0/9 and port Gi3/0/11 (KAH-3850-CORE1-1)
*Jan 29 16:08:31.415: %SW_MATM-4-MACFLAP_NOTIF: Host e8b2.ac7c.6efe in vlan 130 is flapping between port Gi3/0/18 and port Gi2/0/30
*Jan 29 16:08:31.523: %SW_MATM-4-MACFLAP_NOTIF: Host e8b2.ac7c.6efe in vlan 130 is flapping between port Gi3/0/18 and port Gi2/0/30 (KAH-3850-CORE1-1)
*Jan 29 16:08:44.935: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1d1.c033 in vlan 130 is flapping between port Gi3/0/6 and port Gi2/0/16
*Jan 29 16:08:45.034: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1d1.c033 in vlan 130 is flapping between port Gi3/0/6 and port Gi2/0/16 (KAH-3850-CORE1-1)
*Jan 29 16:09:59.866: %SW_MATM-4-MACFLAP_NOTIF: Host 1098.c395.db2b in vlan 130 is flapping between port Gi2/0/30 and port Gi3/0/18
*Jan 29 16:09:59.965: %SW_MATM-4-MACFLAP_NOTIF: Host 1098.c395.db2b in vlan 130 is flapping between port Gi2/0/30 and port Gi3/0/18 (KAH-3850-CORE1-1)
*Jan 29 16:11:06.036: %SW_MATM-4-MACFLAP_NOTIF: Host 3408.bc11.4d5b in vlan 130 is flapping between port Gi3/0/22 and port Te1/0/10
*Jan 29 16:11:06.155: %SW_MATM-4-MACFLAP_NOTIF: Host 3408.bc11.4d5b in vlan 130 is flapping between port Gi3/0/22 and port Te1/0/10 (KAH-3850-CORE1-1)
*Jan 29 16:11:22.304: %SW_MATM-4-MACFLAP_NOTIF: Host e8b2.ac7c.6efe in vlan 130 is flapping between port Gi2/0/13 and port Gi3/0/20
*Jan 29 16:11:22.395: %SW_MATM-4-MACFLAP_NOTIF: Host e8b2.ac7c.6efe in vlan 130 is flapping between port Gi2/0/13 and port Gi3/0/20 (KAH-3850-CORE1-1)
*Jan 29 16:12:17.996: %SW_MATM-4-MACFLAP_NOTIF: Host 9c8b.a01c.fccd in vlan 130 is flapping between port Gi3/0/20 and port Gi3/0/24
*Jan 29 16:12:18.103: %SW_MATM-4-MACFLAP_NOTIF: Host 9c8b.a01c.fccd in vlan 130 is flapping between port Gi3/0/20 and port Gi3/0/24 (KAH-3850-CORE1-1)
*Jan 29 16:12:48.595: %SW_MATM-4-MACFLAP_NOTIF: Host b4f7.a1e4.0c74 in vlan 130 is flapping between port Gi3/0/24 and port Gi2/0/25
*Jan 29 16:12:48.688: %SW_MATM-4-MACFLAP_NOTIF: Host b4f7.a1e4.0c74 in vlan 130 is flapping between port Gi3/0/24 and port Gi2/0/25 (KAH-3850-CORE1-1)
*Jan 29 16:13:47.866: %SW_MATM-4-MACFLAP_NOTIF: Host a45e.603b.9678 in vlan 130 is flapping between port Te1/0/5 and port Te1/0/7
*Jan 29 16:13:47.966: %SW_MATM-4-MACFLAP_NOTIF: Host a45e.603b.9678 in vlan 130 is flapping between port Te1/0/5 and port Te1/0/7 (KAH-3850-CORE1-1)
*Jan 29 16:14:37.365: %SW_MATM-4-MACFLAP_NOTIF: Host c01a.da84.633b in vlan 130 is flapping between port Te1/0/10 and port Gi3/0/17
*Jan 29 16:14:37.463: %SW_MATM-4-MACFLAP_NOTIF: Host c01a.da84.633b in vlan 130 is flapping between port Te1/0/10 and port Gi3/0/17 (KAH-3850-CORE1-1)
*Jan 29 16:14:53.017: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1c1.7aac in vlan 130 is flapping between port Gi3/0/20 and port Gi3/0/17
*Jan 29 16:14:53.113: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1c1.7aac in vlan 130 is flapping between port Gi3/0/20 and port Gi3/0/17 (KAH-3850-CORE1-1)
*Jan 29 16:17:28.551: %SW_MATM-4-MACFLAP_NOTIF: Host 4491.605b.ed09 in vlan 130 is flapping between port Gi2/0/13 and port Gi2/0/16
*Jan 29 16:17:28.644: %SW_MATM-4-MACFLAP_NOTIF: Host 4491.605b.ed09 in vlan 130 is flapping between port Gi2/0/13 and port Gi2/0/16 (KAH-3850-CORE1-1)
*Jan 29 16:17:41.015: %SW_MATM-4-MACFLAP_NOTIF: Host 003d.e8f7.6672 in vlan 130 is flapping between port Gi3/0/20 and port Gi2/0/13
*Jan 29 16:17:41.107: %SW_MATM-4-MACFLAP_NOTIF: Host 003d.e8f7.6672 in vlan 130 is flapping between port Gi3/0/20 and port Gi2/0/13 (KAH-3850-CORE1-1)
*Jan 29 16:19:36.855: %SW_MATM-4-MACFLAP_NOTIF: Host 08f4.ab95.3416 in vlan 120 is flapping between port Gi2/0/13 and port Te1/0/24
*Jan 29 16:19:36.944: %SW_MATM-4-MACFLAP_NOTIF: Host 08f4.ab95.3416 in vlan 120 is flapping between port Gi2/0/13 and port Te1/0/24 (KAH-3850-CORE1-1)
*Jan 29 16:20:54.395: %SW_MATM-4-MACFLAP_NOTIF: Host 24e3.1461.b657 in vlan 130 is flapping between port Te1/0/24 and port Gi2/0/13
*Jan 29 16:20:54.487: %SW_MATM-4-MACFLAP_NOTIF: Host 24e3.1461.b657 in vlan 130 is flapping between port Te1/0/24 and port Gi2/0/13 (KAH-3850-CORE1-1)
*Jan 29 16:22:43.198: %SW_MATM-4-MACFLAP_NOTIF: Host 9cf4.8e0d.05a0 in vlan 130 is flapping between port Gi3/0/5 and port Gi3/0/16
*Jan 29 16:22:43.299: %SW_MATM-4-MACFLAP_NOTIF: Host 9cf4.8e0d.05a0 in vlan 130 is flapping between port Gi3/0/5 and port Gi3/0/16 (KAH-3850-CORE1-1)
*Jan 29 16:23:01.918: %SW_MATM-4-MACFLAP_NOTIF: Host f862.14d7.ed1c in vlan 130 is flapping between port Te1/0/4 and port Te1/0/5
*Jan 29 16:23:42.526: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1c1.7aac in vlan 130 is flapping between port Gi3/0/24 and port Gi3/0/20
*Jan 29 16:23:42.620: %SW_MATM-4-MACFLAP_NOTIF: Host f86f.c1c1.7aac in vlan 130 is flapping between port Gi3/0/24 and port Gi3/0/20 (KAH-3850-CORE1-1)
*Jan 29 16:25:09.662: %SW_MATM-4-MACFLAP_NOTIF: Host 1098.c395.db2b in vlan 130 is flapping between port Gi2/0/14 and port Gi3/0/18

marce1000 · ‎02-01-2019

- Actually you have hosts flapping , between different (up)link ports. Make sure your network is free from loops (too).

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

balaji.bandi · ‎02-01-2019

Depends how your network connected, if you think the bug is matches, upgrade and post the results. also check as suggested any device having some loops.

BB

***** Rate All Helpful Responses *****

How to Ask The Cisco Community for Help

Leo Laohoo · ‎02-01-2019

OMfG.

Look at those DIFFERENT ports!

What are connected to those downstream ports? Are there unmanaged hubs and switches connected to them?

Quintin.Mayo · ‎02-04-2019

Hi,

Thanks for the suggestions I will confirm there isn't any loops. The devices are mobile devices mainly apple and tablets, the down stream devices are 3750's. Would this make a difference?

Thanks

Leo Laohoo · ‎02-04-2019

@Quintin.Mayo wrote:

the down stream devices are 3750's

How many of these downstream devices are switches?

Turn on BPDU Guard and watch how many ports get automatically disabled.