Assigns DNS servers to this DHCP subnet.
domain-name-servers {A.B.C.D} [...]
no domain-name-servers [A.B.C.D]
None
DHCP Server Subnet Configuration
Within this subnet, the subnet DNS server assignments override any conflicting global DNS servers that were assigned for DHCP Server in Global Configuration mode.
If you don't assign subnet DNS servers, but there are DNS servers assigned to DHCP Server globally, the subnet uses the DNS servers that are assigned to DHCP Server globally.