That may be indicating that your local (on-LAN) DNS is not working, or cannot be reached from the switch (that's getting the wrong addresses).
Your local DNS must be the first entry in the list of DNS servers available.
If there are firewalls between the switches/devices make sure they can pass UDP port 53.
Probably the easiest way to really track it down would be to use a packet capture analyzer and see what dialog (request/response) is occurring. Catch a trace of the dialog and post it (clean up any sensitive addresses first).
It also might be worth checking things like IP domain assignments and network masks.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...