•
Cisco Catalyst Switch (or other third-party switch): The switch must support 802.1X, so it can act as
the 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.
Best Practices-Requirements and Recommendations
• Enable 802.1X Authentication—If you want to use the 802.1X standard to authenticate Cisco Unified
IP Phones, be sure that you have properly configured the other components before enabling it on the
phone.
• Configure PC Port—The 802.1X standard does not take into account the use of VLANs and thus
recommends that only a single device should authenticate to a specific switch port. However, some
switches (including Cisco Catalyst switches) support multi-domain authentication. The switch
configuration determines if you can connect a PC to the phone’s PC port.
◦ Enabled—If you use a switch that supports multidomain 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, see 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.
• Configure Voice VLAN—Because the 802.1X standard does not account for VLANs, you should
configure this setting based on the switch support.
◦ Enabled—If you use a switch that supports multidomain authentication, you can continue to use
the voice VLAN.
◦ Disabled—If the switch does not support multidomain authentication, disable the Voice VLAN
and consider assigning the port to the native VLAN.
• Enter MD5 Shared Secret—If you disable 802.1X authentication or perform a factory reset on the phone,
the previously configured MD5 shared secret is deleted.
Related Topics
Security Configuration Menu, on page 99
802.1X Authentication and Status, on page 113
Security Restrictions
A user cannot barge into an encrypted call if the phone that is used to barge is not configured for encryption.
When barge fails in this case, a reorder (fast busy) tone plays on the phone of the barge initiator.
Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco
Unified Communications Manager 9.0 (SCCP and SIP)
22
Cisco Unified IP Phone
Security Restrictions
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