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Occasional Contributor I
Posts: 7
Registered: ‎09-12-2013

My core switch is logging flapping messages

My core switch is logging the following messages. 

34078551: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0050.56ac.749f in vlan 6 is flapping between port Po20 and port Po1 
34078552: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0050.56ac.749f in vlan 6 is flapping between port Po20 and port Po1 
34078553: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0050.56ab.548e in vlan 6 is flapping between port Po20 and port Po1 
34078554: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 
34078555: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 
34078556: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 
34078557: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 001a.645c.71ac in vlan 6 is flapping between port Po20 and port Po200 
34078558: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 
34078559: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 
34078560: Sep 12 08:32:22.868 BRA: %MAC_MOVE-SP-4-NOTIF: Host 0014.5ed8.9f68 in vlan 6 is flapping between port Po20 and port Po3 

What can happening to log these messages?

 

Po20 is the etherchannel to my aruba controller

Po1 and Po3 are blade servers.

MVP
Posts: 4,301
Registered: ‎07-20-2011

Re: My core switch is logging flapping messages

 

Do you have STP turned on on your controllers ?

 

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Occasional Contributor I
Posts: 7
Registered: ‎09-12-2013

Re: My core switch is logging flapping messages

Yes, I have PVST.

 

At controller.

 

spanning-tree mode rapid-pvst
spanning-tree vlan 1
spanning-tree vlan 1 priority 61440
!
spanning-tree vlan 25
spanning-tree vlan 25 priority 61440
!
spanning-tree vlan 30
spanning-tree vlan 30 priority 61440
!
spanning-tree vlan 32
spanning-tree vlan 32 priority 61440
!
spanning-tree vlan 2
spanning-tree vlan 2 priority 61440
!
spanning-tree vlan 23
spanning-tree vlan 23 priority 61440

 

AT CORE

 

spanning-tree mode rapid-pvst
no spanning-tree bridge assurance
 spanning-tree portfast edge default
spanning-tree portfast edge bpduguard default
no spanning-tree optimize bpdu transmission
no spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
spanning-tree vlan 1-65 priority 0

 

 

Guru Elite
Posts: 21,289
Registered: ‎03-29-2007

Re: My core switch is logging flapping messages

anderson.gomes,

 

Do you have a port channel configured on the link between the switch and the controller?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Occasional Contributor I
Posts: 7
Registered: ‎09-12-2013

Re: My core switch is logging flapping messages

Hi,

 

Yes, I have a portchannel.

 

At Controller

 

interface port-channel 1
add gigabitethernet 1/0
trusted
trusted vlan 1-4094
switchport mode trunk

 

At Cisco.

 

interface Port-channel20
description ## CONTROLLER_ARUBA_WIRELESS ##
switchport
switchport trunk encapsulation dot1q
--More--   switchport trunk allowed vlan 1-35,37-4094
switchport mode trunk
speed 1000
duplex full
spanning-tree bpduguard disable
spanning-tree guard root

Guru Elite
Posts: 21,289
Registered: ‎03-29-2007

Re: My core switch is logging flapping messages

On the Aruba side, you only have one interface added to the port channel.  Is there a reason why?


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Moderator
Posts: 321
Registered: ‎08-28-2009

Re: My core switch is logging flapping messages

please also check if you have broadcast/multicast optimisation enabled on any of the vlan interfaces on the controller - there is a known issue in releases equal or older than 6.2.1.1, 6.1.3.8 where the controller sometimes sends out a proxy arp for a host that it learnt, which causes the switch to think the mac flapped.

 

-jeff

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