[FAQ] A customer is experiencing issues with Poly phones when utilizing LLDP

[SteffenBaierUK]

A customer is experiencing issues with Poly phones when utilizing LLDP

Depending on a customer environment a Phone that uses LLDP to determine for example a VLAN may experience issues within a customer network using Poly Phones running UC or PVOS software.

Option 1 to send more than 5 LLDP packets (10 is the max)

• The lldpFastStartCount parameter which usually is set to 5
  

  <?xml version="1.0" encoding="utf-8" standalone="yes"?>
  <!-- number min 3 max 10 default  -->
  <web device.set="1" device.net.lldpFastStartCount.set="1" device.net.lldpFastStartCount="10"/>​

From the Admin Guide:

• Specifies the number of consecutive LLDP packets the phone sends at the time of LLDP discovery. Note that LLDP packets are sent every one second

You can set this to a maximum of 10 giving you and additional 5 seconds for your switch to respond.

 Option 2 to keep sending LLDP packets until a response is received

• The net.lldp.extendedDiscovery which is usually set to 0.
  

  <?xml version="1.0" encoding="utf-8" standalone="yes"?>
  <!-- number of seconds minimum 0 maximum 3600 default 0 -->
  <web net.lldp.extendedDiscovery="60"/>​

From the Admin Guide:

• Specify the duration of time that LLDP discovery continues after sending the number of packets defined by the parameter lldpFastStartCount. Note that LLDP packets are sent every 5 seconds during this extended discovery period.
   

Again this can be changed to a maximum of 3600 seconds which should cover any time period required by your switch to be ready for the LLDP packets.

Option 3 some switches to not send a "System Capabilities" TLV. Therefore Poly Phones may ignore these packets

• The device.net.lldpCapabilitiesRequired disables the need for this.
  

  <?xml version="1.0" standalone="yes"?>
  <!-- Enable LLDP advertisements from devices other than the switch -->
  <changes>
  <config device.set="1"
  		device.net.lldpCapabilitiesRequired.set="1"
  		device.net.lldpCapabilitiesRequired="0"/>
  </changes>​

Depending on the switch configuration a switch may not send or a limited set of the "System Capabilities" TLV.

000018.900|lldp |0|00|lldpSendPacket
000018.900|lldp |1|00|Sending LLDP packet with length (lldpPktLen= 37)
000019.900|lldp |0|00|lldpSendPacket
000019.900|lldp |1|00|Sending LLDP packet with length (lldpPktLen= 354)
000020.900|lldp |0|00|lldpSendPacket
000020.900|lldp |1|00|Sending LLDP packet with length (lldpPktLen= 354)
000020.906|lldp |1|00|Received LLDP packet from 50 0f 80 af 87 15.
000020.906|lldp |0|00|Uninterrupted power from Switch
000020.906|lldp |0|00|lldpProcessRecvPacket ouiType == LLDP_802_3_OUI
000020.906|lldp |2|00|Ignoring LLDP packet from other than host.

device.net.lldpFastStartCount:

• SSIP/SPIP since UC Software 4.0.12
• VVX since UC Software 5.3.0
• CCX, Edge E and Trio since GA

net.lldp.extendedDiscovery:

• VVX since UC Software 5.4.2
• CCX, Edge E and Trio since GA