Network Protocols - Cisco 8831 Administration Manual

Cisco Unified IP Conference Phone 8831
Icon

Network protocols

Cisco Unified IP Phones support several industry-standard and Cisco networking protocols required for voice
communication. The following table provides an overview of the networking protocols that the Cisco Unified
IP Conference Phone 8831 supports.
Table 6: Supported networking protocols on the Cisco Unified IP Conference Phone 8831
Networking Protocol
Cisco Discovery Protocol
(CDP)
Dynamic Host
Configuration Protocol
(DHCP)
Description
Linked mode
Encrypted
Purpose
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.
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.
Cisco Unified IP Conference Phone 8831 Administration Guide for Cisco Unified Communications Manager 9.0
Network protocols
Usage Notes
The Cisco Unified IP Conference
Phone 8831 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.
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.
If you cannot use option
Note
150, you may try using
DHCP option 66.
15