ISC DHCP failover relationships - User Guide - BlueCat Horizon

BlueCat Horizon User Guide
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Product name
BlueCat Horizon

ISC DHCP failover enhances DHCP service reliability by establishing redundancy between servers. Key features include failover relationships for synchronized configuration, scope-level management for granular control, and visible address pool failover status. Additionally, you can customize scope behavior on the secondary server during deletion and select failover relationships during creation.

Refer to the following topics for instructions on how to manage failover relationships for ISC DHCP servers:

Viewing ISC DHCP failover relationships

You can view existing ISC DHCP failover relationships at the server level. DDI orchestrator automatically detects and syncs all existing failover relationships.

To view failover relationships in DDI orchestrator:

  1. On the Admin page, select the Service management tab.
  2. Select the server you want to view in the list. You can use the filters in the left sidebar to filter the list for ISC DHCP services only.
  3. Use either the Action menu or the ellipses in the row to select Manage failover.
  4. The dialog displays all relationships associated with the selected server.

The Manage failover dialog for an ISC DHCP server, which also displays the status of each failover relationship associated with the server.

For ISC DHCP services, scopes engaged in failover relationships are grouped and labeled as such in the Authority column of the IPAM list after you apply the DHCP scopes filter in the left sidebar. The Failover relationship column displays the name of the specific failover relationship the scope belongs to. Additionally, the Inspector displays failover information for the selected server.


If there is a failover relationship associated with the server, a Failover section is added to the Inspector, which provides basic information about the failover relationship.

The DHCP scope details section in the Inspector displays the failover relationship on address pools for ISC servers. This information includes the name and servers associated with the failover relationship.


The DHCP scope details section of the Inspector.

It's also possible to view failover relationships for ISC DHCP scopes that participate in failover when managing address pools. In the Manage DHCP pools dialog, a Failover column displays the scope's failover relationship.


The Manage DHCP pools dialog with the Failover column highlighted.

It's not possible, however, to change the failover relationship when adding or editing a pool. The Failover relationship field will be read-only.


The Add pool window opened from the Manage DHCP pools dialog with the Failover relationship field highlighted.