Stp loop, Not able to trace source

Hello,
I am new to cisco switches and learning about cisco switches now. we have a LAN with 6509 as core router and 2950s/3550s as access switches.
When I ran wireshark on my machine, I saw an stp loop repeating from a cisco device. I have noted down the MAC-address and tried in vain to find the same in our LAN. I am seeing packets like Address: "Spanning-tree-(for-bridges)_00" and "loop reply". I am not able to see any of the MAC addresses found in this loop conversation, on my LAN. I read that these loops are not good for the network. Where can I start to resolve this problem?
Thanks in advance for your advice.

There is likely no problem at all. ;-)
If you were really experiencing a loop, you would have other problems.
Best for you will be to start making a study of spanning tree (STP) and it's inner workings. Here is a good starting point:
http://www.cisco.com/en/US/tech/tk389/tk621/tsd_technology_support_protocol_home.html
Armed with this knowledge you can try to analyze the traffic that was observed by wireshark.
regards,
Leo

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