cisco WS-C6506-E flapping issue please help

[sachipany@]

May 29 07:48:12.726: %MAC_MOVE-SW1_SP-4-NOTIF: Host 0ccb.85b4.e093 in vlan 172 is flapping between port Po696 and port Po10
May 30 04:45:51.056: %MAC_MOVE-SW1_SP-4-NOTIF: Host 2c33.6157.0be5 in vlan 172 is flapping between port Po696 and port Po9
May 30 04:57:13.384: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po5 and port Po9
May 30 07:09:00.784: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po5 and port Po9
May 30 07:30:53.345: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po9 and port Po5
May 30 15:10:39.054: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po696 and port Po10
May 30 15:39:48.180: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2d03.7777 in vlan 172 is flapping between port Po10 and port Po696
May 30 16:19:50.278: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po696 and port Po10
May 31 12:09:30.961: %MAC_MOVE-SW1_SP-4-NOTIF: Host b4f1.daee.c713 in vlan 172 is flapping between port Po696 and port Po10
May 31 13:13:13.464: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po10 and port Po696
May 31 14:04:33.939: %MAC_MOVE-SW1_SP-4-NOTIF: Host 703c.6914.ba2f in vlan 172 is flapping between port Po10 and port Po696
Jun 1 02:47:01.561: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9ce3.3f90.fa8f in vlan 172 is flapping between port Po9 and port Po5
Jun 1 08:45:50.059: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po696 and port Po5
Jun 1 10:20:23.134: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9ce3.3f90.fa8f in vlan 172 is flapping between port Po5 and port Po9
Jun 1 14:10:02.370: %MAC_MOVE-SW1_SP-4-NOTIF: Host 304b.079d.2cec in vlan 172 is flapping between port Po696 and port Po10
Jun 1 15:24:08.010: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po696 and port Po10
Jun 1 15:25:59.390: %MAC_MOVE-SW1_SP-4-NOTIF: Host 304b.079d.2cec in vlan 172 is flapping between port Po10 and port Po696
Jun 1 15:28:19.394: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po10 and port Po696
Jun 2 03:47:20.603: %MAC_MOVE-SW1_SP-4-NOTIF: Host 2c33.6157.0be5 in vlan 172 is flapping between port Po696 and port Po9
Jun 2 11:48:10.805: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po9 and port Po5
Jun 3 03:49:20.913: %MAC_MOVE-SW1_SP-4-NOTIF: Host 2c33.6157.0be5 in vlan 172 is flapping between port Po696 and port Po9
Jun 3 03:56:41.133: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db4.fed2 in vlan 172 is flapping between port Po696 and port Po10
Jun 3 15:26:52.158: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po696 and port Po10
Jun 4 04:22:17.687: %MAC_MOVE-SW1_SP-4-NOTIF: Host 1c42.7deb.ccb9 in vlan 172 is flapping between port Po10 and port Po696
Jun 4 08:43:06.638: %MAC_MOVE-SW1_SP-4-NOTIF: Host 9465.2db6.7191 in vlan 172 is flapping between port Po696 and port

[Giuseppe Larosa]

Hello sachipany@ ,

check the topology of Vlan 172, because there might be a bridging loop on it.

Verify with show spanning-tree vlan 172 that all devices agree on the root bridge identity and also the stability of STP itself.

Hope to help

Giuseppe

[pieterh]

in addition to Guiseppes response

- did this situation occur recently? or is this happening a long time?

- on the clients check if not BOTH wired and wireless interfaces are connected at the same time

most BIOS have a setting to disable wireless when connected to ethernet/lan

NB! based on the number, Po696 MAY be the (internal) port-channel to the wireless controller blade? but you need to check.

[sachipany@]

this problem happening last 2 to 3 months

[gilberto_cardenas]

- What is the usage for vlan 172?

- Run this command show span det | in occur|from|exec and share output, this is to see STP stability for all vlans 

- is this happening all the time or especific periods?