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Note: where my post shows source = &quot;linksys&quot; it should be the IP address of the switch<br />

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Note: where my post shows source = "linksys" it should be the IP address of the switch


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I have someone on my network that has hooked up a switch that is sending out VTP stuff that is messing with my cisco switch, and has apparently hooked up into another ISP service causing Spanning Tree to shut off the main Wan port on our Cisco switch periodically for about 1 minute at a time every 20 minutes or so. I'm trying to figure out who it is, so I set up a span port on my switch and am sniffing all the traffic but I'm not sure what I'm looking for exactly. <br />
<br />
What port does spanning tree run on? UDP or TCP? Will I even be able to see it with a packet sniffer?<br />
<br />
HELP!
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I have someone on my network that has hooked up a switch that is sending out VTP stuff that is messing with my cisco switch, and has apparently hooked up into another ISP service causing Spanning Tree to shut off the main Wan port on our Cisco switch periodically for about 1 minute at a time every 20 minutes or so. I'm trying to figure out who it is, so I set up a span port on my switch and am sniffing all the traffic but I'm not sure what I'm looking for exactly. 

What port does spanning tree run on? UDP or TCP? Will I even be able to see it with a packet sniffer?

HELP!

How to see Spanning Tree traffic...Port #?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.