Network Troubleshooting

Switch is Acting Like a Hub

A general discussion group for network troubleshooting issues.
Carl T
Posts: 2
Joined: Wed May 26, 2010 1:53 pm

Switch is Acting Like a Hub

Postby Carl T » Fri Jun 25, 2010 1:03 pm

Hi All,
I have a building wide network wih a core switch in the datacenter and uplinks from 8 closet switch stacks.

I took a trace from a port from each closet stack to observe broadcast traffic (no port spans, etc). The first thing I noticed was I was seeing multiple other conversations on this port.

I always thought a switch would only send traffic to a port if it was bound for that specific device on that port (MAC address) or was a broadcast/multicast.

I'm seeing this behaviour on each of the eight closet stacks and am worried that it is causing degraded performance especially on busy days.

Any suggestions on what I should look for in the configuration file?

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