Talari Difference

As companies search for a better way to WAN, it can be hard to differentiate one product from another. Link aggregation, load balancing, path control, traffic steering and fail-over solutions are offered in different forms from different SD-WAN vendors. When assessing these offerings, it's important to understand what separates Talari from the crowd.

Quality–based routing

Other products include policy-based routing, which allows an administrator to predetermine paths based on assumptions about bandwidth or latency. But the real network rarely conforms to predefined assumptions. Talari is the only network technology software that combines predetermined policies with up to the millisecond knowledge of the actual network performance, creating a thinking network to ensure application quality.

What does this mean?

It's the difference between saying "put my VoIP traffic on my MPLS link because it ought to be better" and "treat my VoIP as high priority and do whatever you need to do to make sure that my calls are always clear, never drop, and are never crowded out by lower priority applications."

One-way assessments of true quality

Some companies purport to base path decision on quality, while only measuring latency via round trip ping. But latency is only one dimension of a complex quality assessment and round trip measurement ignores the fact that traffic can take different routes in each direction. And those directions can vary drastically in latency, bandwidth, and loss. Talari measure the loss, latency and jitter of every path in each direction to create a complete and nuanced network map. Using this information, path decisions can be made intelligently and with full knowledge and awareness.

What does this mean?

Applications with asymmetric traffic such as VDI can actually perform worse by being sent on a link that looks good when only round trip latency is considered. With Talari, users will experience responsive application performance without the lag that leads to complaints, session disconnects, and lost productivity.

Intelligent load balancing

Load balancing designed to make better use of available bandwidth is a key element in WAN design. But not all load balancing is created equal. The most simplistic load balancing assigns individual sessions to a path, often without regard to link characteristics and application requirements. More sophisticated ones balance by the packet. But both of these approaches will result in poor application quality in cases with dissimilar links. For example, in aggregating MPLS link with Cable, the latency and bandwidth between the two will vary widely and unpredictably and the corresponding application performance will as well. Packet load balancing without intelligence can result in out of order packets and high loss and the resulting retransmits can cause worse performance than no load balancing at all. Talari's intelligent load balancing spreads a single session across multiple links only when the end result will be improved performance. It also adapts to changing conditions and moves packets off links as quality degrades or links fail without disrupting the session. And its loss mitigation and reorder control compensates for dissimilar link characteristics.

What does this mean?

With Talari, all available bandwidth is used, resulting in a reduction in congestion and a corresponding improvement in application performance, regardless of the type of underlying links and regardless of the application mix. Quality sensitive applications remain on high quality paths and bulk transfers complete faster by using aggregated link capacity without displacing high priority traffic.

Packet duplication

A feature unique to Talari's solution is selective packet duplication. The packets from low bandwidth, latency sensitive applications such as VoIP can be duplicated across two or more links. This trades off bandwidth for predictable application performance and results in the highest possible application performance and quality.

What does this mean?

As bandwidth cost decreases, companies can use less expensive and abundant bandwidth and still be assured of excellent application quality for the highest priority applications. If high voice quality or peak ERP application performance is a business necessity, Talari's WAN solution with packet duplication will help achieve it.

Failover without session interruption

Failing over to a backup link when a primary WAN link fails is baseline functionality in many products. Even routing protocols can accomplish this in a simplistic way. The key issues are how long it takes, what happens to active sessions, what constitutes a failure, how traffic is prioritized in the resulting bandwidth constrained network and how session flapping is prevented when the link begins to recover. With Talari, the failure is detected within a fraction of a second and traffic is moved to the remaining live links without any interruption to active sessions. And with Talari it doesn't require a full failure to initiate traffic changes – even high latency, packet loss, and jitter will result in Talari proactively steering packets around the problem. If the remaining links don't have enough bandwidth, traffic is prioritized and cached according to company policies and prioritization so that mission critical applications continue to function. And with Talari, recovery avoids the flapping that often occurs when a link is reestablished.

What does this mean?

Users won't notice outages. Business will continue without interruption. And corrective actions with a service provider can be undertaken after the fact and without it being a crisis.