Supplemental Guide – DOC. 8412A
UC-P100-S/UC-P110-S Phones for Skype for Business
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In addition to manual configuration, the phone also supports automatic discovery of
VLAN via LLDP, CDP or DHCP. The assignment takes effect in this order: assignment via
LLDP/CDP, manual configuration, then assignment via DHCP.
LLDP
LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which
allows the phone to receive and/or transmit device-related information from/to directly
connected devices on the network that are also using the protocol, and store the
information about other devices. LLDP transmits information as packets called LLDP
Data Units (LLDPDUs). An LLDPDU consists of a set of Type-Length-Value (TLV)
elements, each of which contains a particular type of information about the device or
port transmitting it.
LLDP-MED (Media Endpoint Discovery)
LLDP-MED is published by the Telecommunications Industry Association (TIA). It is an
extension to LLDP that operates between endpoint devices and network connectivity
devices. LLDP-MED provides the following capabilities for the endpoint:
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Capabilities Discovery: allows LLDP-MED endpoint to determine the capabilities
that the connected switch supports and has enabled.
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Network Policy: provides voice VLAN configuration to notify the phone which
VLAN to use and QoS-related configuration for voice data. It provides a “plug
and play” network environment.
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Power Management: provides information related to how the phone is powered,
power priority, and how much power the endpoint needs.
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Inventory Management: provides a means to effectively manage the phone and
its attributes, such as model number, serial number and software revision.
TLVs supported by the phone are summarized in the following table:
TLV Type
tlv name
description
Mandatory TLVs
Chassis ID
The network address of the phone.
Port ID
The MAC address of the phone.
Time To Live
Seconds until data unit expires.
The default value is 180s.
End of LLDPDU
Marks end of LLDPDU.
