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LLDP (Link Layer Discovery Protocol) allows Ethernet network devices to receive and/or transmit device-related information to directly connected devices on the network that are also using the protocol, and store the information that is learned about other devices. Information gathered with LLDP is stored in the device as a management information database (MIB) and can be queried with the Simple Network Management Protocol (SNMP) as specified in RFC 2922. 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.
Each of the TLV components has the following basic structure:

Type

Length

Value

7 bits

9bits

0-510 octets

LLDP supports advertising the following TLVs:

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TLV Name

TLV Type

Description

Mandatory TLVs

 

 

 

Chassis ID

Specifies the IP address of the sending port. 

Port ID

Specifies the MAC address of the IP phone. 

Time To Live

Specifies the life of the transmitted information on the IP phone. The default value is 180sec. 

End of LLDPDU

Marks the end of the TLV sequence in the LLDPDU. No further processing of TLVs after this is necessary. This is a mandatory TLV and therefore must be present at the end of the data stream.

Optional TLVs

 

 

 

System Name

Specifies the
administratively-assigned name for the IP phone.
The default value is "UCxxx" 

System Description

Specifies the description of the IP phone.
The default value is IP Phone 

System Capabilities

Specifies the supported and enabled capabilities of the IP phone.
The supported capabilities are Bridge, Router and Telephone.
The enabled capabilities are Bridge and Telephone by default. 

Port Description

Specifies the description of the sending port.
The default value is "WAN PORT".

IEEE Std 802.3
Organizationally Specific TLV

MAC/PHY
Configuration/Status

Specifies duplex and bit rate settings of the IP phone.
The Auto Negotiation is supported and enabled by default.
The advertised capabilities of PMD
Auto-Negotiation are:
100BASE-TX (full duplex mode)
100BASE-TX (half duplex mode)
10BASE- T (full duplex mode)
10BASE- T (half duplex mode)

LLDP -MED TLVs

 

 

 

 

 

 

 

Media Capabilities

Specifies the MED device type of the IP phone and the supported LLDP -MED TLV type can be encapsulated in LLDPDU.
The supported LLDP -MED TLV types are:

  • LLDP -MED Capabilities
  • Network Policy
  • Extended Power via MDI-PD
  • Inventory
 

Network Policy

Specifies the port VLAN ID, application type, L2 priority and DSCP value. 

Extended
Power-via-MDI

Specifies power type, source, priority and value.

 

Inventory –
Firmware Revision

Specifies the firmware revision of IP phone. 

Inventory – Serial
Number

Specifies the serial number of IP phone. 

Inventory –
Manufacturer Name

Manufacturer name of IP phone.
The default value is "Htek".

 

Inventory – Model Name

Specifies the model name of IP phone. 

Asset ID

Specifies the asset identifier of IP phone.
The default value is "asset".

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LLDP is disabled on IP phones by default. You can configure LLDP via web interface, LCD Interface or using the configuration file. You can also configure the sending frequency of LLDP packet. The default sending frequency is 120s.
To configure LLDP feature via web interface:
1. Log into the web interface
(The default administrator user name and password are both "admin")
2. Click on Network->Advanced.
3. In the LLDP block, select the desired value from the pull-down list of Active.
4. Enter the desired time (in seconds) in the Packet Interval (1~3600s) field.
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5 5. Click SaveSet to accept the change and the phone will reboot automatically.
To configure LLDP feature via LCD interface:
1. Press Menu →Settings →Advanced Settings(The default password is "admin") →Network →LLDP.
2. Press and or press Switch soft key to select the Enable choice from the Active field.
3. Enter the desired time (in seconds) in the Packet Interval (1~3600s) field.
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4. Click Save to accept the change and the phone will reboot automatically.

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The following figure shows the LLDP packets sent and received by the IP phone, each packet contains multiple TLVs.
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DHCP VLAN

IP phones support VLAN discovery via DHCP. When the VLAN Discovery method is set to DHCP, the IP phone will detect DHCP option for a valid VLAN ID. The predefined option 132 is used to supply the VLAN ID by default. You can customize the DHCP option used to detect the VLAN ID. Besides, you can use the DHCP option 133 to get the 802.1p priority of VLAN.
In addition, we also support configure multiple configurations with only one option. Option 43 is a comprehensive configuration item. You can put option 132, option 133 and so on into it. The IP Phone will get the information you configured from option 43. The specific configuration method will be described in detail later.

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  1. Start the Tftpd32 application.
  2. Select the Current Directory and Server interfaces.
  3. Click the DHCP server Tab.
  4. Click the "Settings" button.

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