Switch acts like a hub

[tuva02100]

Hi

I have a switched network here, with 10 - 12 switches, now there seems like one or two are acting like hubs, because I can se alot of traffic.

What can be reasons for this ? overload ? and is there some way i could check the switch, so i could determine the switch that is acting like the hub ?

Br

Tuva

[mheusing]

Hi Tuva,

There can be several reasons for a switch to show the behaviour.

1) Asymmetric routing

2) Spanning tree related problems

3) Full CAM table

VTP should not be the reason for it. As a side note: you can have as many VTP servers as you want in a VTP domain and I would even recommend to have at least two, in case one of them goes down.

Back to your issues: can you please follow the troubleshooting instructions in "Unicast Flooding in Switched Campus Networks"

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801d0808.shtml

This might already solve your issues or help you understand, why it happens.

Hope this helps! Please rate all posts.

Regards, Martin

[tuva02100]

Hi Martin

thank you, i'll read it and follow it, and see if i can figure it out. :)

Br

-Tuva