From: sajid mavani (sajidmavani@gmail.com)
Date: Sat Jan 03 2009 - 15:21:07 ARST
Hi Jason,
Thanks a lot for your detail explanation, I sincerly appreciate it.. Well I
would keep in mind what u have said and would check accordindly. I would be
replicating the same secanrio once again and would update you' about the
same.
Thanks everyone for your help... :)
Have a nice day.
Regards
Sajid
On Sat, Jan 3, 2009 at 9:59 PM, Jason Madsen <madsen.jason@gmail.com> wrote:
> Another thing I just thought of is that by default STP (and other
> protocols) are not allowed through q in q tunnels. I didn't see anything
> about them in your email, but if you had one on your switch and didn't
> tunnel through STP as well this could contribute to your issue.
>
> Jason
>
>
> On Sat, Jan 3, 2009 at 9:26 AM, Jason Madsen <madsen.jason@gmail.com>wrote:
>
>> Hi Sajid,
>>
>> To me MAC Flapping indicates that a switch is "seeing" a MAC address flap
>> between different ports. Typically with Layer 2 switches Spanning Tree runs
>> and determines a loop-free path through our topology. With a stable network
>> you should only see 1 MAC address coming from 1 port. The main reason I can
>> think of continually seeing it in different places is because a loop is
>> present in your network somewhere.
>>
>> Some potential causes could be having redundant paths in your network and
>> having "spanning-tree disable", "bpdu-filter", or possibly "portfast"
>> without bpduguard on one or more of your trunk links preventing
>> Spanning-Tree from doing the necessary "blocks". It's difficult to say
>> exactly what's happening on your switch without seeing config's though. I'd
>> certainly take a look at your Fa0/7 and Po1 interface config's for
>> starters.
>>
>> Jason
>>
>>
>> On Sat, Jan 3, 2009 at 2:31 AM, sajid mavani <sajidmavani@gmail.com>wrote:
>>
>>> Hi Jason,
>>>
>>> Sorry for the late reply, I dont have a access to the switches as I was
>>> doing a remote session online. As far as my knowledge goes I dont think
>>> that bpdu-filter or spaning tree was disable.. I just had to do a layer 2
>>> etherchanel between all the 4 switches .. as i enabled lacp on it .. I
>>> started gettting that error message,
>>>
>>>
>>> Kindly let me know in such cases if you get this kind of error messages,
>>> what all trouuble shooting steps could be performed.
>>>
>>> Thanks everyone for your guidance and jason sorry once again for
>>> replying late,
>>>
>>> Have a ncie day.
>>>
>>> Regards
>>>
>>> Sajid
>>>
>>> On Fri, Jan 2, 2009 at 7:55 PM, Jason Madsen <madsen.jason@gmail.com>wrote:
>>>
>>>> you don't have bpdu-filter or spanning-tree disable on any of your trunk
>>>> links, do you?
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, Jan 2, 2009 at 7:17 AM, Jason Madsen <madsen.jason@gmail.com>wrote:
>>>>
>>>>> maybe you've created a spanning tree loop. do you have physical access
>>>>> to the switch, or is a remote rack type situation?
>>>>>
>>>>>
>>>>> On Thu, Jan 1, 2009 at 10:12 PM, sajid mavani <sajidmavani@gmail.com>wrote:
>>>>>
>>>>>> Hello Everyone,
>>>>>>
>>>>>>
>>>>>> Please let me know what could I do to get this resolved..
>>>>>>
>>>>>>
>>>>>> When I created a etherchanel between SW1 & SW2 .. I got the following
>>>>>> error
>>>>>> message listed below.. Please let me know how would i get this
>>>>>> resolved, as
>>>>>> I have got this similar type of messages on many occasions.
>>>>>>
>>>>>>
>>>>>> {Configuration used
>>>>>>
>>>>>>
>>>>>> SW1 & SW2
>>>>>>
>>>>>>
>>>>>> conf t
>>>>>>
>>>>>>
>>>>>> int range fas 0/19 - 20
>>>>>>
>>>>>> switchport trunk encapsulation dot1q
>>>>>>
>>>>>> switchport mode trunk
>>>>>>
>>>>>> chanel-group 1 mode active ( lacp) }
>>>>>>
>>>>>>
>>>>>> Below is the error message i received.
>>>>>>
>>>>>> SW2#
>>>>>>
>>>>>> %SW_MATM-4-MACFLAP_NOTIF: Host *0030.8587.f331* in vlan 1 is flapping
>>>>>> between port Fa0/7 and port Po1
>>>>>>
>>>>>> %SW_MATM-4-MACFLAP_NOTIF: Host 0030.8587.f331 in vlan 1 is flapping
>>>>>> between
>>>>>> port Fa0/7 and port Po1
>>>>>>
>>>>>> *
>>>>>> *
>>>>>>
>>>>>> *####################################################################
>>>>>> *
>>>>>>
>>>>>> *Trouble shooting the problem *
>>>>>>
>>>>>> * *
>>>>>>
>>>>>>
>>>>>>
>>>>>> *1) Below oput shows this for verification *
>>>>>>
>>>>>>
>>>>>>
>>>>>> SW2#sh mac address-table vlan 1
>>>>>>
>>>>>> Mac Address Table
>>>>>>
>>>>>> -------------------------------------------
>>>>>>
>>>>>>
>>>>>>
>>>>>> Vlan Mac Address Type Ports
>>>>>>
>>>>>> ---- ----------- -------- -----
>>>>>>
>>>>>>
>>>>>>
>>>>>> 1 001a.2fd4.3d17 DYNAMIC Po3
>>>>>>
>>>>>> *1 0030.8587.f331 DYNAMIC Po1*
>>>>>>
>>>>>> * 1 0030.8587.f332 DYNAMIC Po1*
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2)
>>>>>>
>>>>>> * *
>>>>>>
>>>>>> *SW3#sh mac address-table address 0030.8587.f331 *
>>>>>>
>>>>>> * Mac Address Table*
>>>>>>
>>>>>> *-------------------------------------------*
>>>>>>
>>>>>> * *
>>>>>>
>>>>>> *Vlan Mac Address Type Ports*
>>>>>>
>>>>>> *---- ----------- -------- -----*
>>>>>>
>>>>>> 1 *0030 .8587.f331* DYNAMIC Po1
>>>>>>
>>>>>> Total Mac Addresses for this criterion: 1
>>>>>>
>>>>>>
>>>>>> 3)
>>>>>>
>>>>>>
>>>>>>
>>>>>> SW2#clear mac address-table dynamic interface port-channel 1 vlan 1
>>>>>>
>>>>>>
>>>>>> SW2 #clear mac address-table dynamic interface port-channel 1 vlan 1
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ............................................................................
>>>>>>
>>>>>>
>>>>>>
>>>>>> Still I am getting the same error message.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> I would be great full if anyone could let me know how to get this
>>>>>> resolved.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>>
>>>>>> Sajid
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
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