Health Check Services for Managed Devices

The health-check feature uses ping-probes to measure WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. availability and latency on selected uplinks. Based upon the results of this health-check information, the managed device can continue to use its primary uplink, or failover to a backup link. Latency is calculated based on the round-trip time of ping responses. You must define an uplink interface via the uplink manager and enable the health check feature before the results of this health check appear in the WAN section of the Monitoring Dashboard.

For more information on the WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. Dashboard, see WAN.

ArubaOS supports policy-based routing on each uplink interface, which allows you to specify the next hop to which packets are routed. ArubaOS supports multiple next-hop lists, to ensure connectivity in the event that a device on the list becomes unreachable. If you are using Policy Based Routing, you can define global ping settings for all next-hop list destinations.

The Health Check section of the Configuration > Services > WAN tab allows you to configure probe measurement settings ping probe settings for the primary WAN uplink on the managed device, as well as for next hop links used by the policy-based routing feature.

Table 1: WAN Health Check Settings
Parameter	Description
Health Check	Click this check box to enable the health check features.
Remote Host IP/FQDN	IP address or FQDN Fully Qualified Domain Name. FQDN is a complete domain name that identifies a computer or host on the Internet. of a remote host to which the managed device is connected. The WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. health check feature will check the connectivity to the managed device uplink to this device.
WAN
Probe Mode	Click the Probe Mode drop-down list and select ping or UDP to enable this feature.
Probe Interval (sec)	The Probe Interval field specifies the probe interval, in seconds. The WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. health-check feature sends the number of probes defined by the Pocket Burst per Probe parameter during each probe interval. To change the default interval of 10 seconds, enter a new value into this field.
Packet Burst Per Probe	The Pocket Burst per Probe field specifies the number of probes to be sent during the probe interval. To change the default value of 5 probes, enter a new value into this field.
Probe Retries	The number of times the managed device will attempt to resend a probe.
Jitter Measurement	If the health check feature is configured to use UDP probe mode, the WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. health-check feature can measure jitter on the connection to the remote host by sending and measuring packets at fixed intervals.
PBR
Probe Mode	Click the Probe Mode drop-down list and select ping to enable this feature.
Probe Interval (sec)	The Probe Interval field specifies the probe interval, in seconds. The WAN Wide Area Network. WAN is a telecommunications network or computer network that extends over a large geographical distance. health-check feature sends the number of probes defined by the Pocket Burst per Probe parameter during each probe interval. To change the default interval of 10 seconds, enter a new value into this field.
Packet Burst Per Probe	The Pocket Burst per Probe field specifies the number of probes to be sent during the probe interval. To change the default value of 5 probes, enter a new value into this field.
Probe Retries	The number of times the managed device will attempt to resend a probe. To change the default value of 3 retries, enter a new value into this field.