Cisco 7937 and DHCP Check-in

[Mark VandeVere]

This week, with no known changes to DHCP, network or CUCM, our 7937 phones are starting to check in with DHCP every 3 seconds. They have a valid address and work fine, they are just constantly hitting DHCP. Ideas are appreciated in advance.

<<<rockpile.log snip>>>

[02-19]07:51:35.686|dhcp |3|00|eventCB: 2
[02-19]07:51:38.726|dhcp |3|00|eventCB: 2
[02-19]07:51:41.766|dhcp |3|00|eventCB: 2
[02-19]07:51:44.816|dhcp |3|00|eventCB: 2
[02-19]07:51:47.856|dhcp |3|00|eventCB: 2
[02-19]07:51:50.905|dhcp |3|00|eventCB: 2

<<<end rockpile.log snip>>>

[Carlo Poggiarelli]

Hi Mark.

I observed similar issue.

Which firmware are you running?

Please let me know

Carlo

[Mark VandeVere]

apps37sccp.1-4-3-0

Were you able to resolve your issue?

[stoneda]

HI

I am getting the same issue did you resolve the issue?

I am running apps37sccp.1-4-4-0

[Rob Huffman]

Hi there,

I'm guessing it's this bug which is resolved in Firmware 1-4-5;

Conference Phones Cisco 7937 continually request for DHCP

CSCtr56885

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCtr56885

Symptom:The IP phone 7937 continually requests for DHCP if the DHCP Lease time is greater than 7 days. The phone continues to work fine while it is sending those continuous DHCP requests.

Conditions:DHCP Lease time is greater than 7 days

Workaround:1) Reset the IP Phone (Will stop the DHCP Flood, but will re-occur again)
2) Reduce the DHCP lease time to a value less than 7 days

[stoneda]

Thank you for your response, I managed to find the bug and have now upgraded the firmware, however out DHCP lease is set to four days.

Recently I've had 7941's and 7942 causing DHCP storms, a reset of the phone seems to stop the continues DHCP requests however this keeps happing. Any ideas welcome. 

[L.K.]

Experiencing similar issues recently. Multitude of phone models, 7842, 8861, etc......

Besides firmware update, what was the solution for some that have experienced this?