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AMA-CUCM Troubleshooting: Best Practices for Reading Trace Files

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Beginner

CUCM- Cisco IP phones in DHCP loop

These phones continue to chirp on our network since we virtualized our call manager. The phones cant go through the full boot up process and keep looping(chatting) on network. Cant search the phones in call manager because they are not registered was wondering if anyone has experienced the same or has a resloution that we could try. Thanks

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Enthusiast

Re: CUCM- Cisco IP phones in DHCP loop

Hazel,

Did you change IP addresses when you migrated to the virtual platform? If so, did you remember to change the TFTP address in your DHCP scope?

Beginner

Re: CUCM- Cisco IP phones in DHCP loop

The TFTP server address was changed and the DHCP ranges but some phones keep looping and cant get to call manager at all.

Cisco Employee

Re: CUCM- Cisco IP phones in DHCP loop

When you say that you virtualized your servers, did you reinstall them?  Or did you DRS backup, install the VM's (with the same name/IP/etc) and DRS restore?   If you did a reinstall of any kind without DRS restoring the Certs from the old server, then you are probably hitting a limit in the Security By Default (SBD) that was introduced in CUCM 8.0 and later.   If the TFTP server that you now are specifying is not in the ITL listing, then the phones will not register to them.  Check the Settings->Security Configuration->Trust List->ITL File.  If the new TFTP is not on the list, then that will explain why the phones are not registering.

The easiest way to recover is to bring the old cluster back on line (pub and TFTP), set the service parameter for '8.0 Rollback' to true, the phone will talk to the old server, get the new config that will then erase the ITL file, then you can turn on the new cluster and the phones should register.

Thanks,

Dan Keller

Technical Marketing Engineer

Beginner

Re: CUCM- Cisco IP phones in DHCP loop

Hey Thanks Daniel- We used DR files to install the VMs, its a little late in the game to rollback to the older version. We are moving to 10.x does any know if this issue will be worse or better?

Cisco Employee

Re: CUCM- Cisco IP phones in DHCP loop

I don't understand your response.  My previous post asked if your virrtualized UCM was new or DRS restored from the working version.  The infrastructure and number of phones is irrelevant. If the TFTP server in your DHCP scope is not in the ITL list, then you can't register and the phones will continue to cycle.

Thanks,

Dan Keller

Technical Marketing Engineer

Enthusiast

Re: CUCM- Cisco IP phones in DHCP loop

Hazel,

Adding to what Dan posted, you can test to see if the ITL list is the issue by trying the following on one or two phones http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080bbcd03.shtml

The post was for 7-8 migrations, but still applies. Instructions are for 7900 phones, but you can extrapolate for 9900 as necessary.

If that fixes it, you have the choice to do what Dan suggested, or manually erase the ITL files on each phone.

Stephanie

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