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Cisco Unified IP Phone

Cisco Unified IP Phones also provide a proxy EAPOL Logoff mechanism. In the event that the locally attached

PC disconnects from the IP phone, the LAN switch does not see the physical link fail, because the link between

the LAN switch and the IP phone is maintained. To avoid compromising network integrity, the IP phone sends

an EAPOL-Logoff message to the switch on behalf of the downstream PC, which triggers the LAN switch to

clear the authentication entry for the downstream PC.

Cisco Unified IP Phones also contain an 802.1X supplicant. This supplicant allows network administrators

to control the connectivity of IP phones to the LAN switch ports. The current release of the phone 802.1X

supplicant uses the EAP-FAST, EAP-TLS, and EAP-MD5 options for network authentication.

Required Network Components

Support for 802.1X authentication on Cisco Unified IP Phones requires several components, including:

• Cisco Unified IP Phone: The phone acts as the 802.1X supplicant, which initiates the request to access

• Cisco Secure Access Control Server (ACS) (or other third-party authentication server): The authentication

• Cisco Catalyst Switch (or other third-party switch): The switch must support 802.1X, so it can act as the

Best Practices-Requirements and Recommendations

• Enable 802.1X Authentication: If you want to use the 802.1X standard to authenticate Cisco Unified IP

• Configure PC Port: The 802.1X standard does not take into account the use of VLANs and thus Cisco

• Configure Voice VLAN: Because the 802.1X standard does not account for VLANs, you should configure

the network.

server and the phone must both be configured with a shared secret that authenticates the phone.

authenticator and pass the messages between the phone and the authentication server. After the exchange

completes, the switch grants or denies the phone access to the network.

Phones, be sure that you have properly configured the other components before enabling the standard

on the phone.

recommends that only a single device should be authenticated to a specific switch port. However, some

switches (including Cisco Catalyst switches) support multi-domain authentication. The switch configuration

determines whether you can connect a PC to the PC port of the phone.

Note

Only Cisco Unified IP Phone 6911 has a PC port.

• Enabled: If you are using a switch that supports multi-domain authentication, you can enable the

PC port and connect a PC to it. In this case, Cisco Unified IP Phones support proxy EAPOL-Logoff

to monitor the authentication exchanges between the switch and the attached PC. For more

information about IEEE 802.1X support on the Cisco Catalyst switches, refer to the Cisco Catalyst

switch configuration guides at:

http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_products_support_series_home.html

• Disabled: If the switch does not support multiple 802.1X-compliant devices on the same port, you

should disable the PC Port when 802.1X authentication is enabled. If you do not disable this port

and subsequently attempt to attach a PC to it, the switch will deny network access to both the phone

and the PC.

this setting based on the switch support.

Required Network Components

Cisco Unified IP Phone