05-15-2012 08:21 AM - edited 03-07-2019 06:43 AM
Hi... I was checked my syslog servers and I verify a lot of messages:
%SW_MATM-4-MACFLAP_NOTIF: Host 0800.069d.3840 in vlan 550 is flapping between port Gi1/0/40 and port Gi1/0/38
In my topology I have one Siemens Switch (not manageable) connected in LAN 3750.
Any sugestions?
05-15-2012 09:09 AM
Hello Fulvio,
the message may be the sign of a bridging loop.
Check what is connected on the involved ports gi1/0/38 and gi1/0/40. Eventually disable one of the two ports ( if you can) and verify if the error message stops.
if both ports are connected to unmanaged siemens switch it may be safe to disable one, because the loop may have been formed in this way.
Hope to help
Giuseppe
05-15-2012 10:01 AM
This error indicates that there is a loop on the network...
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Posted by WebUser Neeraj Jagga from Cisco Support Community App
05-15-2012 04:23 PM
%SW_MATM-4-MACFLAP_NOTIF: Host 0800.069d.3840 in vlan 550 is flapping between port Gi1/0/40 and port Gi1/0/38
The MAC address belongs to "Siemens Ag". DO you have a Siemens industrial server? Maybe you need to either disconnect one of the two OR properly configure etherchannel.
05-16-2012 02:32 AM
Hi.....
Yesterday, I found the problem..... We found that LOCAL Network support connected the not manageable siemens switch in two CISCO Switches.
Now we working to contact him to resolve this issue....
Thanks for your help.
04-02-2020 01:27 AM
This is a know bug on a Siemens Switches where the switch uses the same Generic MAC address (
0800.069d.3840. ) for LLDP
Their is a code upgrade for the Siemen devices to fix this
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