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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14587-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
Ta b l e 1-1 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol Purpose Usage Notes
Bootstrap Protocol
(BootP)
BootP enables a network device such
as the Cisco Unified IP Phone to
discover certain startup information,
such as its IP address.
If you are using BootP to assign IP
addresses to the Cisco
Unified
IP Phone, the BOOTP Server
option shows “Yes” in the network
configuration settings on the phone.
Cisco Discovery
Protocol (CDP)
CDP is a device-discovery protocol
that runs on all Cisco-manufactured
equipment.
Using CDP, a device can advertise its
existence to other devices and receive
information about other devices in
the network.
The Cisco Unified IP Phone uses
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.
Cisco Peer-to-Peer
Distribution Protocol
(CPPDP)
CPPDP is a Cisco proprietary
protocol that is used to form a
peer-to-peer hierarchy of devices.
CPPDP also is used to copy firmware
or other files from peer devices to
neighboring devices.
CPPDP is used by the Peer Firmware
Sharing feature.
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 information about
DHCP configurations, refer to the
“Cisco TFTP” chapter in Cisco
Unified
Communications Manager
System Guide.
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