To add Sub-Pools
Log in to your Cisco DNA Center instance.
In the menu, select .
In the Network Settings page, select the IP Address Pools tab.
Within the IP Address Pools table, click Reserve.
In the Reserve IP Pool window, enter the following information:
IP Pool Name—enter the name of the Sub-Pool.
Type—select Generic.
IP Address Space—select IPv4 to add an IPv4 Sub-Pool.
IPv4—select the IP address and name of the parent IP Pool that the Sub-Pool becomes a child of.
Prefix length—select the prefix length of the IP Pool.
IPv4 Subnet—enter the IP address of the Sub-Pool.
Gateway IP Address—enter the default gateway IP address of the Sub-Pool.
DHCP Server(s)—enter the IP address of the DNS/DHCP Servers that you would like to assign DHCP roles.
DNS Server(s)—enter the IP address of the DNS/DHCP Servers that you would like to assign DNS roles.
Click Save to add the new Sub-Pool.
Log in to your Address Manager instance.
Select the IP Space tab.
Under IPv4 Blocks, click the name of the parent IP address pool that the Sub-Pool was created under.
Verify that the Sub-Pool was created under the parent IP address pool.