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IP Not Being Received on Polycom Phones on Bluecat DHCP Server
8x8 Support

IP Not Being Received on Polycom Phones on Bluecat DHCP Server

When Polycom VVX 410 phones connected to the network do not receive IPs from the Bluecat DHCP server and cannot register, disable CDP and LLDP. Learn more here.

Symptom

Polycom VVX 410 phones connected to the your primary network do not receive IPs via DCHP from the Bluecat DHCP server and cannot register with 8x8.

Phones connected to a Sophos UTM (connected to your primary network) are able to receive IP addresses handed out by the Sophos box.

Applies To

Polycom phones, Bluecat DHCP

Resolution

Disable CDP and LLDP

Disabling CDP and LLDP on the Polycom phones removed the restriction. The phones were able to receive offers from the DHCP server and were able to register and be activated with 8x8.

To disable CDP and LLDP through the Phone

  1. Go to Menu > Settings > Advance > Put in the phone password > Admisistration Settings Network Configuration > Ethernet > VLAN Menu
  2. Disable LLDP and CDP Compatibility

To disable CDP and LLDP through the Web GUI

  1. On the phone's Web GUI, go to Settings > Network > Ethernet.
  2. Under VLAN Settings, check Disable for LLDP and CDP.
    PolycomCDPDisable-600x414.png
  3. Save all changes.
  4. Allow the phone to reboot.

Cause

Polycom phone settings are blocking the return messages with IP addresses from the Bluecat DHCP server.

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