C6509 Leaking Traffic Between VLANs

Unanswered Question
Jan 29th, 2009


We have a C6509 switch. For some reason, if I enable Ether Real on my computer I am able to see some traffic from other VLANs. This defeats the normal behabvior of a switch. Can anybody shed some light on this?


- There is no port mirroring configured on any VLAN or switch.


I have this problem too.
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m-haddad Thu, 01/29/2009 - 08:13

Hello Glen,

Thanks for the link however in my situation I have only one router which is the default gateway for all the VLANs and it is the C6513.

Let me know your thoughts,


m-haddad Thu, 01/29/2009 - 08:42

Also, the traffic I am seeing on Ether Real is not related at all to the VLAN my laptop is in. I am seeing traffic between two hosts on VLAN 203 for example.

m-haddad Thu, 01/29/2009 - 23:16

Hello Glenn,

I am suspecting an issue in cabling. Such as somebody has connected a switch to itself!

Let me know ur thoughts,



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