Configuring DHCP alert settings - BlueCat Integrity - 26.1.0

Address Manager Administration Guide
ft:locale
en-US
Product name
BlueCat Integrity
Version
26.1.0

DHCP alerts notify an administrator when dynamic address usage within a DHCP range or shared network is unusually low or exceptionally high.

When the ratio of free-to-allocated addresses falls below or rises above administrator-defined watermarks, Address Manager will send an alert in the form of an email message or an SNMP trap. If you are using a shared network in DHCP, a DHCP alert notification for all networks inside the shared network will be sent as a single entity notification using the DHCP alert set at the configuration level. DHCP alerts for each individual network within any shared network will also be sent only if object-specific DHCP alerts are set at the network or DHCPv4 range level.

You can configure DHCP alert settings globally at the configuration level. These global settings are inherited by all DHCP ranges, IP blocks, and networks in any configuration. You can also configure object-specific DHCP alert settings to override the global settings at the block, network, or DHCPv4 range level.

  • DHCP alerts can be viewed in the Event List, filtering for the "DHCP Alert Service" event type. For details, refer to Viewing DHCP alert notifications.
  • For DHCP alerts to be forwarded to users, you must configure the Event Notification Service. For more information, refer to Managing notification groups.

To configure DHCP alert settings:

  1. Select the Settings tab in the sidebar.
  2. Under Notification settings, select DHCP alert settings.
  3. Set the Host Density watermark values:
    Note: HD-Ratio is calculated per RFC 3194, the Host-Density Ratio for Address Assignment Efficiency. For more information, refer to http://tools.ietf.org/html/rfc3194.
    • HD-ratio low watermark (%)—triggers an alert when DHCP usage falls below this value (when too few addresses are being used).
    • HD-ratio high watermark (%)—triggers an alert when a DHCP usage rises above this value (when too many addresses are being used).
    • Frequency—the frequency at which the alert service should poll DHCP usage level.
  4. In the Change control section, add comments if required.
  5. Select Update DHCP alert settings.