802.1X Authentication; Overview - Cisco 3905 Administration Manual

Cisco Unified IP Phone
Feature

802.1X Authentication

Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
802.1X authentication
The Cisco Unified IP Phones support 802.1X authentication.

Overview

Cisco Unified IP Phones and Cisco Catalyst switches traditionally use Cisco Discovery Protocol (CDP) to
identify each other and determine parameters such as VLAN allocation and inline power requirements. CDP
does not identify locally attached workstations. Cisco Unified IP Phones provide an EAPOL pass-through
mechanism. This mechanism allows a workstation attached to the Cisco Unified IP Phone to pass EAPOL
messages to the 802.1X authenticator at the LAN switch. The pass-through mechanism ensures that the IP
phone does not act as the LAN switch to authenticate a data endpoint before accessing the network.
Cisco Unified IP Phones also provide a proxy EAPOL Logoff mechanism. In the event that the locally attached
PC disconnects from the IP phone, the LAN switch does not see the physical link fail, because the link between
the LAN switch and the IP phone is maintained. To avoid compromising network integrity, the IP phone sends
Description
The Cisco Unified IP Phone can use 802.1X authentication to request
and gain access to the network. See the
13
Objective estimate of the Mean Opinion Score (MOS) for Listening
Quality (LQK) that ranks audio quality from 5 (excellent) to 1 (bad). This
score is based on audible-concealment events due to a frame loss in the
preceding 8 seconds of the voice stream.
Note
Average MOS LQK score for the entire voice stream.
Lowest MOS LQK score from the start of the voice stream.
Baseline or highest MOS LQK score from the start of the voice stream.
The following codecs provide the corresponding maximum MOS LQK
scores under normal conditions with no frame loss:
Version of the Cisco-proprietary algorithm used to calculate the MOS
LQK scores.
Cisco Unified SIP Phone 3905 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
for more information.
The MOS LQK score can vary based on the type of codec that
the Cisco Unified IP Phone uses.
• G.711: 4.5
• G.728: 3.9
• G729A/AB: 3.7
802.1X authentication
802.1X authentication, on page
13