Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
New Member

6500 switch acting as a hub

We have 6500 switch running IOS s72033-adventerprisek9_wan-mz.122-18.SXF3.bin

Many servers are connected to this switch. When i use wireshark to sniff traffic on our

windows DFS server connected to this switch, i see traffic for entire VLAN on wireshark. I

am not suppose to see traffic between other hosts/server since this server port is not

configured as a span port. It seems like 6500 switch is acting as a hub . There is no span

session configured on this switch. Our system admins have been complaining about

performance issue on their servers. I used wireshark on different servers on that switch

and i see same result. All the servers connected to this switch is seeing traffic for

entire vlan regardless of ports. I even connected my laptop to this switch and i can see

traffic for entire vlan.


Re: 6500 switch acting as a hub

Hi there,

I'm pretty sure that when the MAC table fills up, the switch then acts like a hub, or more precisely it unicast floods.

This may or may not help (but I hope it does):

CreatePlease to create content