problems of vlan switching in a Cisco 6509

[grocanar1967]

Hi

i have a big problem my cisco 6509.

indeed for one of my vlan i see the traffic in all the interface attached to the vlan as if it was a hub.

Does someone has already see this kind of problem.

it s a main security issue

[terrencepayet]

Hi Eric,

This is strange indeed.

Which VTP mode is configured on your switch?

Regards,

Terence

[fb_webuser]

only 1 vlan and the rest are fine?

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Posted by WebUser Ahmed Rasmy

[Nelson Hou]

Hi Eric,

  I suggest you to pick any workstation and do a packet capture. The packet you received from other workstations, what's the destination MAC addresses?

Also, try to issue this command on that VLAN (sample 1) to make sure that your mac address table are correct

switch# show mac address-table dynamic vlan 1

Nelson

[grocanar1967]

Well

thanks for your interest

First i m in vtp mode server

Second yes it s the only vlan i have problems with.

The only diffiference for this vlan with the other vlans is that it doesn't have an interface for the routing in the 6500.

It does act only as a switch for this vlan.

For the others vlan it does the routing too.

I have capture the traffic.

and the mac adress is the good mac adress. It s the mac adress of the destination of the packet.

and the mac adress table for this vlan is correct. I have about 20 entries.

[fb_webuser]

I don't think you have a problem. I think this is normal, computers are chatty in layer 2 specially if they are using windows....

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Posted by WebUser Ahmed Rasmy