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What Networking Protocols are Used?
Table 1-2
Supported Networking Protocols on the Cisco Unified IP Phones (continued)
Networking Protocol
Cisco Discovery Protocol
(CDP)
Cisco Peer-to-Peer
Distribution Protocol
(CPPDP)
Dynamic Host
Configuration Protocol
(DHCP)
Hypertext Transfer
Protocol (HTTP)
Hypertext Transfer
Protocol Secure (HTTPS)
IEEE 802.1X
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
1-6
Purpose
CDP is a device-discovery protocol that
runs on all Cisco-manufactured
equipment.
Using CDP, a device advertises its
existence to other devices and receives
information about other devices in the
network.
CPPDP is a Cisco proprietary protocol
used to form a peer-to-peer hierarchy of
devices. CPPDP is also used to copy
firmware or other files from peer devices
to neighboring devices.
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.
HTTP is the standard way of transferring
information and moving documents across
the Internet and the web.
Hypertext Transfer Protocol Secure
(HTTPS) is a combination of the
Hypertext Transfer Protocol with the
SSL/TLS protocol to provide encryption
and secure identification of servers.
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.
Chapter 1
An Overview of the Cisco Unified IP Phones
Usage Notes
The Cisco Unified IP Phones use CDP to
communicate information such as auxiliary VLAN ID,
per port power management details, and Quality of
Service (QoS) configuration information with the
Cisco Catalyst switch.
CPPDP is used by the Peer Firmware Sharing
feature.
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, see
Dynamic Host Configuration Protocol
Cisco TFTP
in the Cisco Unified Communications
Manager System Guide.
Cisco Unified IP Phones use HTTP for the XML
services and for troubleshooting purposes.
Cisco Unified IP Phones do not support the use of
IPv6 addresses in the URL. You cannot use a literal
IPv6 address in the URL or a hostname that maps to
an IPv6 address.
Web applications with both HTTP and HTTPS
support have two URLs configured. Cisco Unified
IP Phones that support HTTPS choose the HTTPS
URL out of the two URLs.
The Cisco Unified IP Phones implement 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. See
Supporting 802.1X Authentication on
Cisco Unified IP Phones, page 1-19
information.
and
for additional
OL-23091-01
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Table of Contents
Troubleshooting
