Dot1x and ip-phones

Unanswered Question
Jun 3rd, 2010

We are deploying dot1x in a relativly large network. We are going to use PEAP-TLS machine authentication (no user auth) with mac-address bypass. How do we handle ip-phones in this scenario? Do we need to authenticate the phone with PEAP-TLS or can we use mac-address authentication for the phones? How do we handle the voice vlan on a dot1x enabled port, will the static command voice vlan xxx work on a dot1x enabled port and is this a security issue?

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elliott.fougman Tue, 06/15/2010 - 03:35

Hi Kaare,

It is now possible to authenticate the phone against Cisco ACS using either EAP-MD5 or EAP-FAST, this assumes that your access switches are reasonably new and support MDA (multi domain authentication).  I will try and post some documentation on how this is achieved as I had a case open with TAC who were able to get this scenario working for us.

Having said that MAC Auth Bypass is a perfectly acceptable option as is putting the phones into a guest vlan.

Kind Regards

Elliott

Ganesh Hariharan Tue, 06/15/2010 - 08:35
We are deploying dot1x in a relativly large network. We are going to
use PEAP-TLS machine authentication (no user auth) with mac-address
bypass. How do we handle ip-phones in this scenario? Do we need to
authenticate the phone with PEAP-TLS or can we use mac-address
authentication for the phones? How do we handle the voice vlan on a
dot1x enabled port, will the static command voice vlan xxx work on a
dot1x enabled port and is this a security issue?

Hi,

Check out the below link for ip phone configuration with 802.1x integration

http://www.cisco.com/en/US/tech/tk389/tk814/technologies_configuration_example09186a00808abf2d.shtml

http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_configuration_example09186a00801df0e4.shtml

Hope to Help !!

Ganesh.H

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