mac flapping

[aslam mohammad]

Hi,

I am getting this logs in my cisco 3850 access switch.Can please tell me the resolution process.

Aug 10 06:27:15.288: %SW_MATM-4-MACFLAP_NOTIF: Host 3440.b5c5.0ef2 in vlan 3255 is flapping between port Po32 and port Gi1/0/3
Aug 10 06:48:39.300: %SW_MATM-4-MACFLAP_NOTIF: Host 3440.b5c4.b962 in vlan 3255 is flapping between port Gi1/0/4 and port Po32
Aug 10 08:08:01.565: %SW_MATM-4-MACFLAP_NOTIF: Host 3440.b5c5.0ef2 in vlan 3255 is flapping between port Gi1/0/3 and port Po32

HBDCMGTWSLC3822#sh spanning-tree summary
Switch is in pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short

Name Blocking Listening Learning Forwarding STP Active

  Name                 Blocking          Listening     Learning       Forwarding           STP  Active
--------- ------------    --------                 ---------      --------           ----------                    ----------
VLAN3100              0                        0                 0                    2                           2
VLAN3102              0                        0                  0                   2                           2
VLAN3103              0                        0                   0                  2                             2
VLAN3106              0                        0                   0                  3                              3
VLAN3107               0                      0                   0                  3                              3
VLAN3207               0                      0                  0                  1                                1
VLAN3255              0                        0                0                  3                                  3
---------------------- -------- --------- -------- ---------- ----------

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
7 vlans    0            0             0                16             16

[Leo Laohoo]

3440.b5c5.0ef2 in vlan 3255 is flapping between port Po32 and port Gi1/0/3

What is connected to Gi1/0/3?  Is this the client with the MAC address "3440.b5c5.0ef2"? 

If so, then how many interfaces is this client connected to the network?

[aslam mohammad]

hi Leo

That interface is connected to IBM enclosure server.Two up links (interfaces) connected to Cisco 3850 switches.Like one interface will be one switch second will be second switch.

[Leo Laohoo]

Like one interface will be one switch second will be second switch.

I understand this.  But the question is are both switches in the same stack or different?  If they are in the same stack, are the links configured as part of an EtherChannel?