Where Can I Use This?	What Do I Need?
Prisma SD-WAN (Managed by Strata Cloud Manager)	Prisma SD-WAN

With Prisma® SD-WAN, you meet application Service Level Agreements (SLAs) by configuring Path, QoS, and Security policies. In your Prisma SD-WAN path policy, you define rules that express your business intent for which paths are allowed per application. ION devices evaluate each application session against your defined path policy and select the WAN path that meets the application-specific SLA. One key mechanism for determining whether a path will meet an application’s SLA is monitoring Link Quality.

The Dashboard > Overall Link Quality on the web interface provides the aggregate link quality metrics of all branch and data center sites at a glance. It includes information on the MOS, packet loss, jitter, and latency of the links. View data in the last available 5 minutes' time frames and the last available 1 hour of any metric.

Prisma SD-WAN determines link quality by actively probing the Secure Fabric VPN paths over public and private transports and the private WAN underlay paths. The probes provide a constant measurement of network performance metrics, such as jitter, latency, and packet loss. These metrics, along with application-specific performance metrics and Layer 1 – Layer 7 reachability inform traffic forwarding decisions for new and existing application flows.

By default, Link Quality metrics influence path selection for all real-time voice and video applications. If a link is acceptable, the real-time application stays on the initially selected path. However, when the link becomes degraded or inadequate, the ION device seamlessly moves all existing and subsequent real-time application flows to a suitable alternate path, if one is available and allowed by policy.

Choose link quality metrics and filter the information by Interval, Start Time, and Direction. You can change the metric to any other link quality metric to view the corresponding graphs. The bar graphs display the distribution range up to the 90th percentile of the available data.

The Link Quality Metrics dashboard shows a snapshot of the current state of your monitored links. You view Link Performance, Link Packet Loss, Link Jitter, and Link Latency. By default, the dashboard displays links for all your sites for the most recent time period (last available 5 minutes or last available hour). You can use filters to change the scope of displayed information and analyze specific data in greater detail on the Link Quality Details tab.

Click View Details to view the links table in detail. The table displays all secure fabric links between sites, along with Circuit and WAN information. You can view link quality metrics and link type for each link. Sort the table by any link quality metric to display the worst values at the top. Expand a site to view link quality metrics for ingress and egress flows. You can view the link quality chart per site and path. Your selected site and active path become the preselected filter criteria for the Activity chart.