Change of threshold for alarm "DHCP Pool Exhaustion"

Products

• VMware NSX

Issue/Introduction

• Gateway DHCP server is configured on a segment in NSX.
• DHCP pool utilization has approached 95% (95% of IP addresses in the DHCP pool have been assigned).
• DHCP Pool Exhaustion alarm is observed in NSX Manager:
  

  An IP Pool is overloaded.
The DHCP Server <dhcp_server_id> IP Pool <DHCP pool ID> usage is approaching exhaustion with <pool usage>%IPs allocated.

• You are aware of this state, and you would like to change the threshold on the alarm.

Environment

VMware NSX

Cause

The threshold on "DHCP Pool exhaustion" alarm is 95%. 

Resolution

Once the alarm triggers with default threshold, ideally, DHCP pool should be expanded (e.g. a new block of IP addresses added to the DHCP Server configured on the segment; please see NSX documentation: Configure Gateway DHCP Server on an NSX Segment).

If you would prefer to increase the threshold of the alarm, in NSX UI:

1. Browse to Home -> Alarms -> Alarm Definitions.
2. Search for the definition of alarm "DHCP" "Pool Overloaded".
3. Use the three vertical commas on the left hand side to edit the alarm definition, and overwrite the default threshold to the desired value.

Additional Information

Also see NSX Event Catalog (please search for "Pool Overloaded").