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MiVoice Office 250/Mitel 5000 / Re: Old Inter-tel 8662 and 8622 IP Phones on a HP 2920

« on: December 11, 2014, 01:24:24 PM »

The post from the 14th is absolutely correct.  The issue is the LLDP frame size.  From HP support: 

When the phone receives an LLDP frame from the switch, it seems to no longer process DHCP Offers. Similarly, if the phone has an IP address manually set, it will not process ARP Requests.

Disabling LLDP on the switch globally or at the interface level resolves the symptoms.

Root-Cause of Symptoms Theory:


If the Inter-Tel 8622 phone receives an LLDP frame where the sum of the System_Name and System_Description TLVs  is greater than 147 bytes, the phone seems to then stops processing DHCP Offers, and never acquires its IP address.

Possible Work-Arounds/Alternate Solutions when running >=X.15.06.0012 OS:

*       Option #1:  Disable LLDP globally on the switch (no lldp run)

*       Option #2:  Disable LLDP on a per port basis:

*       Option #3:  Disable the System_Description TLV within the LLDP
advertisements:

 *      Option #4:  Change the System_Name string to a length such that the
System_Name and System_Description TLVs  combined length is <= 147 bytes.  The switch CLI syntax is hostname <name>

Holy cow, thank you so much!  This worked for our Inter-Tel 5000 phone system with the 8662 model phones.  We just ripped out our old aging Dell switches and installed new HP Procurves, and we had the same issue where the phones would get stuck on searching for DHCP server.  We disabled LLDP globally on all 3 new switches and then the phones could connect.

I created an account just to say thanks!