CUCM 8.6.2 and DNS

[SAIFUDEEN C .K]

Dear All,

We have cucm 8.6 with dns configured.

Customer wants to change the DNS IP address.A it is 8.6..we have to rehost the license.

I want know what will be the impact if the DNS IP configured in cucm is not reachable.

It is not a secure cluster.But ITL is there.

Will there be any impact on the phones.We also have jabber in this cluster.

Please help with your inputs.

[Jaime Valencia]

If all you are going to do is change the IP of the DNS which you use, that will not affect the licensing or anything else (aside from a restart of the NIC)

If you are changing the domain, then yes, you'll be forced to re-generate all the certificates to match the new FQDN

[SAIFUDEEN C .K]

Thanks for the reply.

I read post in support forum that, prior to version 9, license MAC is composed of Hash value of some parameters including the primary DNS server for the virtual appliance.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/8_0_2/install/cmins802.html#wp584709