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As of Release 2.2.3, IP telephones support pass-through of 802.1x packets to and from an attached PC. This enables an attached PC running 802.1x supplicant software to be authenticated by an Ethernet data switch.
As of Release 2.6, and as of Release 2.7 for the 4625SW, the IP Telephones support two pass-through modes:
The DOT1X parameter setting controls the pass-through mode. In Proxy Logoff mode (DOT1X=1), when the secondary Ethernet interface loses link integrity, the telephone sends an 802.1X EAPOL-Logoff message to the data switch on behalf of the attached PC. The message alerts the switch that the device is no longer present. For example, a message would be sent when the attached PC is physically disconnected from the IP telephone. When DOT1X = 0 or 2, the Proxy Logoff function is not supported.
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