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96 4600 Series IP Telephone LAN Administrator Guide
These switches support the following three scenarios:
● Standalone telephone (Telephone Only Authenticates) - When the IP telephone is
configured for Supplicant Mode (DOT1X=2), the telephone can support authentication
from the switch.
● Telephone with attached PC (Telephone Only Authenticates) - When the IP telephone
is configured for Supplicant Mode (DOT1X=2), the telephone can support authentication
from the switch. The attached PC in this scenario gains access to the network without
being authenticated.
● Telephone with attached PC (PC Only Authenticates) - When the IP telephone is
configured for Pass-Through Mode or Pass-Through Mode with Logoff (DOT1X=0 or 1),
an attached PC running 802.1X supplicant software can be authenticated by the data
switch. The telephone in this scenario gains access to the network without being
authenticated.
Some switches support authentication of multiple devices connected through a single switch
port. This is known as multi-supplicant or MAC-based operation. These switches typically send
unicast 802.1X packets to authenticating devices. These switches support the following two
scenarios:
● Standalone telephone (Telephone Only Authenticates) - When the IP telephone is
configured for Supplicant Mode (DOT1X=2), the telephone can support authentication
from the switch.
● Telephone and PC Dual Authentication - Both the IP telephone and the connected PC
can support 802.1X authentication from the switch. The IP telephone may be configured
for Pass-Through Mode or Pass-Through Mode with Logoff (DOT1X=0 or 1). The attached
PC must be running 802.1X supplicant software.
Link Layer Discovery Protocol (LLDP)
The Release 2.6 4600 Series IP Telephones support IEEE 802.1AB. Link Layer Discovery
Protocol (LLDP) is an open standards layer 2 protocol IP Telephones use to advertise their
identity and capabilities and to receive administration from an LLDP server. LAN equipment can
use LLDP to manage power, administer VLANs, and provide some administration.
The transmission and reception of LLDP is specified in IEEE 802.1AB-2005. The 4600 Series
IP Telephones use Type-Length-Value (TLV) elements specified in IEEE 802.1AB-2005, TIA
TR-41 Committee - Media Endpoint Discovery (LLDP-MED, ANSI/TIA-1057), and Proprietary
elements. LLDP Data Units (LLDPDUs) are sent to the LLDP Multicast MAC address
(01:80:c2:00:00:0e).