Managing split scopes - User Guide - BlueCat Horizon

BlueCat Horizon User Guide
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en-US
Product name
BlueCat Horizon

A split scope divides the DHCP address range into two or more segments, with each segment being assigned to a different DHCP server. This ensures that if one server fails, another server can continue providing IP addresses to clients.

When creating scopes on Kea servers configured in load balancing mode for High Availability, DDI orchestrator evenly splits the available pool between primary and secondary servers. This ensures efficient distribution of IP addresses and enhances network reliability by balancing the load and providing redundancy.


The Manage DHCP pools dialog, displaying a split DHCP scope.

Managing split scopes for DHCPv6

Through DDI orchestrator, you can manage split scopes on DHCPv6 servers.

To manage DHCPv6 split scopes:

  1. In the list on the Networks tab of the IPAM page, select the relevant DHCPv6 scope.
  2. Use either the Action menu or the ellipses in the row to select Manage scope instances.
  3. Select a second server to manage the DHCP scope, and then select Add.
  4. Use the toggle buttons to enable the servers on which the split scope should reside.
    The Manage scopes dialog, displaying the servers on which segments of the DHCP address range reside. The option to Add scope instance is disabled, because new scope instances cannot be added on Kea DHCP servers.
    Note: You can change the server preferences by selecting the hamburger icon (the three lines to the left of the server) and dragging the servers to change their order. The preference for the second server will always be First Server Preference + 1, and each additional server will increase by an increment of 1.
  5. Select Save.
  6. On the same scope, use the Action menu or the ellipses in the row to select Manage DHCP exclusions.
  7. For the first server, select Add exclusion.
  8. Select the percentage of the address range you want to exclude from the first server and select Add.
  9. For the second server, select Add exclusion.
  10. Select the address range you want to exclude from the second server and select Add.
  11. Select Save.