From: Pavel Bykov (slidersv@gmail.com)
Date: Sat Jan 03 2009 - 14:36:30 ARST
Definitely concentrate at Fa0/7 configuration. if the configuration you have
posted is really the only configuration, then the problem will lie there
On Sat, Jan 3, 2009 at 5:29 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
> >>>>>
> >>>>>
> >>>>> Blogs and organic groups at http://www.ccie.net
> >>>>>
> >>>>>
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-- Pavel Bykov ---------------- Don't forget to help stopping the braindumps, use of which reduces value of your certifications. Sign the petition at http://www.stopbraindumps.com/Blogs and organic groups at http://www.ccie.net
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