Link Quality

Prisma SD-WAN console provides the aggregate link quality metrics of all branch and data center sites at a glance.
Prisma SD-WAN allows network administrators to meet their application Service Level Agreements (SLAs) with its
Path
,
QoS
, and
Security
policies. Through the Prisma SD-WAN path policy, you can define rules to express business intent for which paths are allowed per application. The ION devices evaluate each application session against the defined path policy and select the WAN path that meets the application-specific SLA. One of the many mechanisms used to determine if a path will meet an application’s SLA is monitoring the
Link Quality
.
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.
The Dashboard on the Prisma SD-WAN 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.
By default,
Link Quality
metrics influence path selection for all real-time voice and video applications. If a link is considered acceptable, the real-time application will stay on the initially selected path. Still, when the link is degraded or considered inadequate, the ION device will seamlessly move all existing and subsequent real-time application flows to a suitable alternate path as allowed by policy, if available.

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