Cisco 7821 Administration Manual page 24

Supported Network Protocols
Network protocol
IEEE 802.1X
Internet Protocol (IP)
Link Layer Discovery
Protocol (LLDP)
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
10
Purpose
The IEEE 802.1X standard defines a
client-server-based access control and
authentication protocol that restricts
unauthorized clients from connecting to
a LAN through publicly accessible ports.
Until the client is authenticated, 802.1X
access control allows only Extensible
Authentication Protocol over LAN
(EAPOL) traffic through the port to
which the client is connected. After
authentication is successful, normal
traffic can pass through the port.
IP is a messaging protocol that addresses
and sends packets across the network.
LLDP is a standardized network
discovery protocol (similar to CDP) that
is supported on some Cisco and
third-party devices.
Usage notes
The Cisco IP Phone implements the
IEEE 802.1X standard by providing
support for the following
authentication methods: EAP-FAST
and EAP-TLS.
When 802.1X authentication is
enabled on the phone, you should
disable the PC port and voice VLAN.
To communicate using IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateways
identifications are automatically
assigned if you are using the Cisco
IP Phone with Dynamic Host
Configuration Protocol (DHCP). If
you are not using DHCP, you must
manually assign these properties to
each phone locally.
The Cisco IP Phones support IPv6
address. For more information, see
"Internet Protocol Version 6 (IPv6)"
in the Cisco Unified Communications
Manager Features and Services
Guide.
The Cisco IP Phone supports LLDP
on the PC port.