In the Limiter Options section, you can configure the following options:

  • Error Responses: By default, the LoadMaster simply drops any connections when the RPS limit is reached. The system can send a 429 or 503 HTTP error response instead (followed by a close) if you select the appropriate option in this drop-down list.

  • Fail on RS/Sub-VS Rate Limiting: If rate limiting is activated for a Real Server (RS) or a SubVS, the LoadMaster normally tries to select a different RS/SubVS to use for the connection. Enabling this check box forces the request to fail if the RS that was selected (for example, by persistence) was rate limited. An error response is sent back if one is selected in the Error Responses drop-down list.

  • Generate Limiter Statistics: Enabling this option generates a global summary syslog message every five seconds containing the current state of the QoS subsystem.
Note: This option is disabled by default. Depending upon your client limiting configuration, this can generate a lot of log messages which could be resource intensive.
  • Client Message Repeat Delay: Set the minimum time after a client is no longer limited before a new message is generated. If a client generates a message and continues to be blocked for continuously hitting the limit, no new message is generated. Only if the client goes quiet for the delay period will a new message be generated. Valid values range from 10 - 86400 seconds. The default value is 60 seconds.