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Create a health check instance

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Smart Access Gateway (SAG) provides health checks to monitor service link connectivity and enable automatic failover to backup links. This topic describes how to create a health check instance.

Prerequisites

Ensure that the health check feature is enabled for your account. This feature is disabled by default. To enable it, contact your account manager.

Background information

Associate a health check

Procedure

  1. Log on to the SAG console.
  2. In the top navigation bar, select the target region.
  3. On the Smart Access Gateway page, click the ID of the target Smart Access Gateway instance.
  4. On the details page of the Smart Access Gateway instance, click the Health Check tab.
  5. Click Create Health Check.
  6. In the Create Health Check dialog box, configure the parameters and click OK.
    Parameter Description
    Instance Name A custom name for the health check instance.
    Description An optional description for the health check instance.
    Health Check Type The packet type used for health checks. Only ICMP_ECHO is supported.
    Destination IP address The IP address of the endpoint to monitor.

    To monitor the status of an Express Connect circuit, select Virtual Border Router and then select the target VBR instance from the Destination IP Address drop-down list.

    Note The destination IP address must be reachable from the Smart Access Gateway instance through an existing route.
    Source IP address The source IP address used to send the health check packets.

    To monitor the status of an Express Connect circuit, use an IP address from the service CIDR block in the cloud that is routed through the Express Connect circuit.

    Note If you are probing different destinations, you may need to use different source IP addresses. Ensure that routes allow two-way traffic between the source IP address and the destination IP address.
    Detection Interval The interval between health check probes. A new probe is not sent until the previous one completes or times out. Valid values: 1,000 to 60,000. Default value: 2,000. Unit: ms.
    Note The health check interval must be greater than the health check timeout.
    Detection Times The number of probe packets sent in each health check. Valid values: 1 to 20. Default value: 1.
    Health Check Timeout Period The timeout for a single health check probe. Valid values: 10 to 30,000. Default value: 1,000. Unit: ms.
    Maximum Detection Failures Allowed The number of consecutive probe failures required for the connection to be considered unhealthy. Valid values: 1 to 15. Default value: 3.
    Maximum RTT Allowed The round-trip time (RTT) threshold. Valid values: -1 or 1 to 5,000. The default value of -1 indicates that no RTT threshold is configured. Unit: ms.
    Maximum Number of Times RTT Threshold Can be Exceeded The number of consecutive times the RTT must exceed the threshold before an alert is triggered. Valid values: 1 to 15. Default value: 3.