Cisco 7942G Administration Manual page 17

Chapter 1 An Overview of the Cisco Unified IP Phone
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
IEEE 802.1X
Internet Protocol (IP)
Link Layer Discovery
Protocol (LLDP)
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Cisco Peer to Peer
Distribution Protocol
(CPPDP)
Real-Time Transport
Protocol (RTP)
Cisco Unified IP Phone 7962G and 7942G Administration Guide for Cisco Unified Communications Manager 6.1(3)
OL-17679-01
Purpose
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.
IP is a messaging protocol that addresses
and sends packets across the network.
LLDP is a standardized network discovery
protocol (similar to CDP) that is supported
on some Cisco and third-party devices.
LLDP-MED is an extension of the LLDP
standard developed for voice products.
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.
RTP is a standard protocol for transporting
real-time data, such as interactive voice
and video, over data networks.
What Networking Protocols are Used?
Usage Notes
The Cisco Unified IP Phone implements the IEEE
802.1X standard by providing support for the
EAP-MD5 option for 802.1X authentication.
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 1-15 for additional information.
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.
The Cisco Unified IP Phone supports LLDP on the
PC port.
The Cisco Unified IP Phone supports LLDP-MED
on the SW port to communicate information such as:
Voice VLAN configuration
•
• Device discovery
• Power management
Inventory management
•
For more information about LLDP-MED support,
see the LLDP-MED and Cisco Discovery Protocol
white paper:
http://www.cisco.com/en/US/tech/tk652/tk701/tech
nologies_white_paper0900aecd804cd46d.shtml
CPPDP is used by the Peer Firmware Sharing
feature.
Cisco Unified IP Phones use the RTP protocol to
send and receive real-time voice traffic from other
phones and gateways.
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