Where resilient links are deployed at a site, it is possible to generate a site availability statistic in a report, to determine if there was any period when all links which support site access were down.
The diagram depicts polls happening at three minute intervals. Red samples indicate a ‘down’ status for that link and green an ‘up’ status.
In this example, you can see that only when both the top two links are down (red) simultaneously does the site availability figure also turn red. If either of the two site links remains up (green) then the site remains green. Ethernet is not marked as a Site Link (isSiteLink=NO) and thus has no impact on the site availability status.
Note: The Site availability calculation ignores maintenance periods
Also the calculation is unaffected by any event exclusions in Details Link Health.
Configuring Site availability
Check the site link option on the Edit Watch dialog to mark a circuit as part of a resilient group for a location (each resilient link will need to be checked). Once this is selected Highlight will generate an availability statistic based on the following logic:
All links with the site link option selected will contribute to the site availability statistic and only a failure of all site links at the same time will reduce the site availability figure. Any link at the site which is not marked as a Site Link has no influence on the site availability statistic.
You may also like to review our Hybrid WAN feature.
Configuring Site availability SLA
From Create/(edit) location configure Site availability SLA target % which will be displayed in a site availability report and compared with the actual availability to determine if there were any breaches
Site Availability can be selected from the Bearer Circuits reporting options as shown here. In this example, an individual link had reduced availability during the selected time frame but, due to the resilience offered by site links, the site as a whole remained 100% available. If the site link box is not checked, then Site Availability shows as N/A as in the image below.
In addition there are automatic columns in the report for SLA target and SLA breach when SLA Availability is selected in the reporting options.
Site links also control alert suppression for bearer subwatches.