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From the Infoblox Portal, click ManageConfigure > Networking > IPAM/DHCP > Global DHCP Configuration.
On the Global DHCP Configuration page, expand Automated Scope Management,and complete the following:
Enable Automated Scope Management: Select this check box to configure parameters that Universal DDI uses to analyze your network usage and provide suggestions about your address scope management.
Enable Notifications: Select this check box so the Infoblox Portal can display an alert icon
next to the subnets when they require attention based on the parameters you have configured. You can disable notifications so the alert icon will not show up even when attention is required. You can also turn off notifications temporarily and re-enable it for a later date by selecting a date in the Re-enable Notifications field.Trend Line Threshold: This field displays the current threshold for subnet usage. The default is 90%. You can change the default value by entering a different percentage.
Note title Note Universal DDI validates the threshold four times a day. When the subnet usage reaches or exceeds the threshold at the time when Universal DDI performs the validation, the portal displays the alert icon
next to the respective subnet. The portal removes the icon if the usage falls below the threshold during the next validation time.- Increase DHCP Range Address Space: This field shows the percentage or the number of addresses a subnet will expand when its usage reaches or exceeds the threshold. The default is 20%. You can override the default by setting a specific percentage or a number of addresses for the expansion. If you are configuring this at the global or IP space level, using a percentage is more effective. For a specific subnet, however, you can select a specific number of addresses you want to add. Ensure that you select the corresponding unit from the drop-down menu while entering the value.
Unused IP Reservation: This is the number of unused IP addresses that you want to retain within the subnet and are not associated with any DHCP usage (such as ranges, fixed addresses, and others). The default is 10%. When you override the default, ensure that you take into consideration the parameter for the DHCP range increase so the numbers align properly for your subnets.
Note title Note Universal DDI validates the parameters four times a day. When any of these parameters create concerns for any of the subnets, the portal displays the alert icon next to the respective subnets, so you can preview the suggested options for expanding your subnets. For more information, see Resizing DHCP Scopes.
Click Save & Close to save the configuration or click Cancel to exit.