Question

A network engineer enables Cisco Catalyst SD-WAN Cloud OnRamp for SaaS to optimize access to a monitored cloud application at a branch site that has both a Direct Internet Access (DIA) circuit and a tunnel back to a regional gateway. After configuration, the engineer wants SD-WAN to automatically pick the path with the best application experience. Which mechanism does Cloud OnRamp for SaaS use to determine which egress path delivers the best experience for the SaaS application?

Accepted Answer

It sends HTTP/HTTPS probes toward the SaaS application over each candidate path and steers traffic out the best-performing egress those probes measure (surfaced as a vQoE score)

Answer

It relies on BGP AS-path length advertised by the cloud provider to choose the shortest routing path to the application

Answer

It uses IP SLA ICMP echo to the default gateway of each interface and selects the path with the lowest RTT

Answer

It statically pins the SaaS traffic to the DIA circuit whenever a DIA interface is present, ignoring the gateway path