03-26-2024 08:46 AM - edited 03-26-2024 09:59 AM
HI There,
hoping someone has done this before and can help me out, as i am struggling to find any official Cisco documentation to help.
We're having to change all of the DNS server IP addresses in our CUCM cluster,
I have the process for CUCM and UCCX nailed down, I just also need to change the DNS IP addresses on CUC too.
when I change the Primary and Secondary DNS addresses in CUCM I have to restart the server following the change,
when I do the same on UCCX I simply have to restart a service,
changing the Primary and secondary DNS server on Unity Connection is the same process as on CUCM , however does anyone know -
if a reload of each server is required once i make the change ?
thanks
in advance all.
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03-27-2024 08:14 AM
Hi Roger - I have just received a response from TAC regarding this one - and they pointed me to a document I had not seen full link below.
changing these IP addresses does require a reload on CUCM,IM&P and CUC.
03-26-2024 10:27 AM - edited 03-26-2024 10:32 AM
From what I can recall from doing this on CM and CUC you don’t need to restart anything. It will automatically do a quick restart of the network services on the node, but it’s not really affecting any services.
03-27-2024 03:13 AM
Hi Roger - thanks for your reply,
the Documentation for CUCM12.5 specifically states the server has to be restarted following a change in the Primary/ Secondary DNS server.
I just can't find anything relating to making the same change on CUC, I guess as they run on the same architecture a restart would be required. just seems odd that there is nothing out there ( that i can find) advising the correct procedure to make the change.
Thanks
John
03-27-2024 07:56 AM
Can you please link to that document? As I wrote I have never done any restart of anything when I've done a change of primary or secondary DNS servers in either CM or CUC. It just flips the networking service quickly. This is also discussed in this old post in the community. [CUCM] Change DNS server IP
03-27-2024 08:14 AM
Hi Roger - I have just received a response from TAC regarding this one - and they pointed me to a document I had not seen full link below.
changing these IP addresses does require a reload on CUCM,IM&P and CUC.
03-27-2024 09:15 AM
Interesting, I can tell you from my own experience that there is no need to actually do the restart as stated in documentation. We have done this a number of times when we have had issues with one or both of the DNS servers at a specific DC and we have not done any restart of any nodes or services and have not experienced any downside of that.
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