Cisco 7935 - IP Conference Station VoIP Phone, Руководство администратора

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Chapter 1 Overview of the Cisco IP Conference Station 7935
Networking Protocols
1-2
Cisco IP Conference Station 7935 Administration Guide
78-12727-03
Networking Protocol Purpose Usage Notes
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 IP Conference Station uses
CDP to communicate
configuration information to the
Cisco Catalyst switch. With
CDP, each device sends periodic
messages to a multicast address
and in turn listens to the periodic
messages sent by other devices.
This allows devices on the
network to discover one another
and learn information such as
protocols used, protocol
addresses, and so on.
Dynamic Host Configuration
Protocol (DHCP) DHCP dynamically allocates and
assigns an IP address to network
devices.
DHCP enables you to connect
the IP phone into the network
and become operational without
manually assigning an IP address
and configuring additional
required network parameters.
DHCP is enabled by default. If
disabled, you must manually
configure the IP address, subnet
mask, gateway, and TFTP server
on each station.
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 IP Conference Station
with DHCP. If you are not using
DHCP, you must manually
assign these properties to each
station locally.