DNS settings on CUCM v8.6
One of the main reasons to have a local DNS server in our LAB is to be able to configure it for the Cisco Collaboration servers CUCM, UCCX, etc.
DNS is NOT mandatory for CUCM v8.6
DNS is not mandatory on Cisco Call Manager v8.6, when installing it you can perfectly decide to skip the DNS settings, see screenshot below.
Only if you choose “YES” when installing CUCM and then enter DNS data you will be able to see the IP address assigned using both, the CUCM web GUI and also via the CLI.
Checking DNS on CUCM v8.6 via GUI
Ping DNS server from CUCM GUI
Checking DNS on CUCM 8.6 via CLI
You can use the following CLI command to check that DNS is working properly.
utils network host cucm.tdtlab.com
Another useful CLI command available on CUCM v8.6 is “utils diagnose test“, this command also check Tomcat, NTP, DNS forward and reverse, HDDs and several more infrastructure related parameters, is the perfect indicator of a healthy system and proper connectivity.
utils diagnose test