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Cisco 7971G-GE Manual

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Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
Supporting 802.1X Authentication on Cisco Unified IP Phones
These sections provide information about 802.1X support on the Cisco Unified IP
Phones:
• Overview, page 1-23
• Required Network Components, page 1-24
• Best Practices—Requirements and Recommendations, page 1-24
Overview
Cisco Unified IP phones and Cisco Catalyst switches have traditionally used
Cisco Discovery Protocol (CDP) to identify each other and to determine
parameters such as VLAN allocation and inline power requirements. However,
CDP is not used to identify any locally attached PCs. Therefore, Cisco Unified IP
Phones provide an EAPOL pass-through mechanism, whereby a PC locally
attached to the IP phone may pass through EAPOL messages to the 802.1X
authenticator in the LAN switch. This capability prevents the IP phone from
having to act as the authenticator, yet allows the LAN switch to authenticate a data
end point prior to accessing the network.
In conjunction with the EAPOL pass-through mechanism, Cisco Unified IP
Phones provide a proxy EAPOL-Logoff mechanism. If the locally attached PC is
disconnected from the IP phone, the LAN switch would not see the physical link
fail, because the link between the LAN switch and the IP phone is maintained. To
Secure (encrypted) MeetMe Minimum security level is
authenticated
Secure conference bridge
Conference accepts encrypted and
authenticated calls
Secure (encrypted) MeetMe Minimum security level is
non-secure
Only secure conference bridge
available and used
Conference accepts all calls
Table 1-5 Security Restrictions with Conference Calls (continued)
Initiator’s Phone
Security Level Feature Used
Security Level of
Participants Results of Action
… 41 …


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