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Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
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Chapter
What Networking Protocols are Used?
Dynamic Host
Configuration Protocol
(DHCP)
DHCP dynamically allocates and assigns
an IP address to network devices.
DHCP enables you to connect an IP phone
into the network and have the phone
become operational without your needing
to manually assign an IP address or to
configure additional network parameters.
DHCP is enabled by default. If disabled, you must
manually configure the IP address, subnet mask,
gateway, and a TFTP server on each phone locally.
Cisco recommends that you use DHCP custom
option 150. With this method, you configure the
TFTP server IP address as the option value. For
additional supported DHCP configurations, go to
the Dynamic Host Configuration Protocol chapter
and the Cisco TFTP chapter in the Cisco Unified
Communications Manager System Guide.
Note If you cannot use option 150, you may try
using DHCP option 66.
Hypertext Transfer
Protocol (HTTP) HTTP is the standard way of transferring
information and moving documents across
the Internet and the web.
Cisco Unified IP Phones use HTTP for the XML
services and for troubleshooting purposes.
IEEE 802.1X 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.
The Cisco Unified IP Phone implements the IEEE
802.1X standard by providing support for the
following authentication methods: EAP-FAST,
EAP-TLS, and EAP-MD5.
When 802.1X authentication is enabled on the
phone, you should disable the PC port and voice
VLAN. Refer to the “Supporting 802.1X
Authentication on Cisco Unified IP Phones” section
on page 1-21 for additional information.
Internet Protocol (IP) IP is a messaging protocol that addresses
and sends packets across the network. 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 Unified IP Phone with Dynamic Host
Configuration Protocol (DHCP). If you are not
using DHCP, you must manually assign these
properties to each phone locally.
Link Layer Discovery
Protocol (LLDP) LLDP is a standardized network discovery
protocol (similar to CDP) that is supported
on some Cisco and third-party devices.
The Cisco Unified IP Phone supports LLDP on the
PC port.
Table 1-4 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes