IP Telephone Inventory - Moved Phones

[fishhead64]

We cleared out the IP Telephony Inventory Moved Phones DB by acknowledging them all and clearing it out. A couple days later, there are 4 pages of moved phones and aside from the ones we actively tested with, we know none of them moved. If we're not physically moving to another data jack, office, building, etc. what's the trigger to identify as a Moved Phone?

We see changes in Previous and Last Known STP L2 Port MAC, STP Port Identifier and LLDP Port Identifier. Some changed, some were previously blank. We are confident that these phones did not move, no cabling was touched, etc.

We want to use this info to audit moves so we can update Network Zone for 911 calls. Too many false positives for this to work for us.
Thoughts?
Thanks
Al

 

[AH64Armament]

It seems that something in your network topology has changed - misconfigured switches - LLDP, STP, or CDP settings are changing. Each time it does, your phones may show this.

Spanning tree IMO is the culprit. The switch closest to the Firewall should be spanning tree priority 0. All others can be the default - either 8 or 32768 . You can also layer this for each progressive link - firewall connected switch = 0. Switch 2 that is connected to switch 1 would have a 1 (or 4096), switch 3 that's connected to switch 2 would have a 2 (8192).

Look at the switches and see if you can determine the last spanning tree topology change. Look again after a while.