From: Tyson Scott (tscott@ipexpert.com)
Date: Tue Mar 17 2009 - 10:50:56 ART
I had to think about this a little last night but I believe the behavior you
are seeing is normal for the specific circumstance you are in. The message
is a warning that the switch believes there is a mac that is flapping
between the two VLAN's, which is typically indicative of a spanning-tree
loop. The difference in this situation is that the Port Channel mac address
is the same for both VLAN's. To test this theory put two devices that are
edge devices in each VLAN and send a broadcast ping from each for their
respective subnets. If you see the same type of messages for the MAC's of
the end devices then you have a spanning-tree loop. If not and you continue
to see these messages then everything is OK. Probably not the best solution
to have a port channel with fallback bridging, but it should be OK.
Regards,
Tyson Scott - CCIE #13513 R&S and Security
Technical Instructor - IPexpert, Inc.
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Nadeem Ansari
Sent: Tuesday, March 17, 2009 7:38 AM
To: Antonio Soares
Cc: joe_astorino@comcast.net; CCIE, R/S OSL; CCIE R/S, Groupstudy
Subject: Re: Fallback Bridging Console Message: Is This Normal?
This is not normal it may be due to any convergance taking place in switch
topology and responsible protocol is STP.
Need to check STP topology changes wether is there any blocked port transit
in to forwarding state for matter of time
Regards
Nadeem
On Tue, Mar 17, 2009 at 4:50 PM, Antonio Soares <amsoares@netcabo.pt> wrote:
> I don't think this is normal. These type of messages are usually
associated
> with a STP loop. Disable the redundant links in your
> Port-Channel and see what happens. But first check the cpu occupation on
> both switches: show proc cpu | ex 0.00.
>
>
> Regards,
>
> Antonio Soares, CCIE #18473 (R&S)
> amsoares@netcabo.pt
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> joe_astorino@comcast.net
> Sent: segunda-feira, 16 de Margo de 2009 18:59
> To: CCIE, R/S OSL; CCIE R/S, Groupstudy
> Subject: Fallback Bridging Console Message: Is This Normal?
>
> I have 2 switches trunked together in this lab scenario. The scenario
> instructs me to do fallback bridging for VLANs 999 and 1000.
> On SW 1 I configured an SVI for each vlan, and configured the fallback
> bridging. On the first switch, I now continually get the
> below output: Note, the switches are linked via po12 port-channel. My
first
> thought is that this is absolutely normal because the
> VLANs are bridged, but I wanted to make sure. It definitely is an
annoyance
> when trying to finish the rest of the lab (I always turn
> on "logging con deb" so I can see everything necessary in the lab)
>
>
> 6d16h: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.46e2.6997 in bridge group 1 is
> flapping between port Po12 (Vl1000) and port Po12 (Vl999)
> Cat1#
> 6d16h: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.46e2.6997 in bridge group 1 is
> flapping between port Po12 (Vl999) and port Po12 (Vl1000)
>
>
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