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Why do desktop switches (unmanaged switches) drop the EAP-TLS message in 802.1x deployment?


I'm doing differents tests with 802.1x to find the best setting to my network but I've found a problem with the desktop switches that I don't know how I can resolve.If there are solution,

I'll try to explain the case....


Hardware Setup:
Cisco Switch <-> Unmanaged Switch <-> PC

I'm using a switch WS-C2960+24PC-L with 15.0(2)SE5 IOS with the following 802.1x setting:

 switchport mode access
 authentication host-mode multi-auth
 authentication port-control auto
 authentication periodic
 dot1x pae authenticator
 dot1x timeout tx-period 3
 spanning-tree portfast

well....although I can access to my lab without any problem when I plug the PC directly to the port, I can't connect when I use a unmaneged switch between them (I don't don't receive the EAP message in my RADIUS and the switch try to authenticate using MAB)

I repeat the same with a old hub that I had in my desk and I connected correctly so I think the problem is in the unmanaged switch but I'm using 3-4 3Com differents models.


Someone know why the desktop switch (unmanaged switch) does not forward the EAP message?

Are there any restriction or bug in this kind of devices?


Thanks in advance,

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