Hybrid WAN enables per-application trafic steering over two or more
uplink connection types. The connection types broadly fall under three
categories: (1) MPLS, (2) Broadband, (3) LTE. Each has unique path
characteristics. For example, MPLS offers guaranteed SLA, but has high
cost and (usually) low bandwidth. Broadband has low cost and high
bandwidth, but does not offer any SLA guarantees. An LTE connection is
one notch lower in terms of reliability, but is much more flexible,
portable, readily available, and works best as a backup circuit.
To mitigate for no SLA guarantees, SPAN measures various
SLA metrics (e.g. latency, loss, jitter) in real time over each
tunnel. SPAN offers a flexible policy framework to let you select
the best end-to-end path for an application.