We have 112 Cisco phones on a CCM 3.3 Publisher and Subscriber here at Mesa Verde National Park. It has been installed since 2004 with very few VoIP related problems experienced since then. About 65 of these phones are 7912 models. We started experiencing random intermittent broadcast storms on our network last July and have not been able to trace their source. Just last week, we discovered two 7912 phones that would consistently not register with CCM. They appeared to be locked up. We discovered this because we were trying to chase a broadcast storm problem that came up when a CAT 3550 was replaced because of failure.
What I am looking for is some feedback regarding 7912 intermittent problems and failures that would cause a network storm. Is this common, not so common or does anyone just think I am crazy?
Another question Rob. How did you determine it was duplicate IP problem? Our phones do get IP from DHCP and the chance of duplicate IP address issued is probably not that high right? OK, more than 1 question I reckon...
These two phones consistently start the broadcast storm as soon as they "lock up" trying to register.
That Night/Day was one that convinced me to always read all associated Bugs and Known/Resolved Caveats when doing an upgrade (my bad!) But, we do "live and learn"!
When doing the Phone Firmware Upgrade, rather than using the .exe we usually use the method listed below so we can test the Firmware on a few phones before the full deployment.
Cisco IP Phone Model 7912 Alternate Firmware format
The Cisco IP Phone Model 7912 Firmware version 8.0(4) is also supplied in a zip file, as an alternative in case a Cisco CallManager is not available to run the executable installer program. The name of this file is cmterm-7912G-sccp.8-0-4.zip.
After unzipping the firmware files, manually copy the firmware to the appropriate directory on the TFTP server. Then apply the firmware to the select "test" phones via the Device>Phone>Firmware Load Information
Firmware Load Information (leave blank to use default)
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