How does SD-WAN traffic prioritization with QoS work?

Updated 11/7/2018 6:50:38 PM by Comcast Expert


Quality of Service (QoS) is a network’s ability to manage traffic prioritization and network performance. Through QoS, a network can manage the bandwidth being used for specific functions and applications. The purpose of this is to dedicate maximum network performance to high priority network traffic and minimum network performance to low priority network traffic, thus creating an express lane for specified traffic.

QoS is used in SD-WAN through Differentiated Services Code Point (DSCP) values to prioritize network traffic internally, and it does not prioritize traffic across the Internet to other SD-WAN sites. As a result, QoS comes into effect with Egress traffic only. All traffic must be pre-marked with DSCP values to be prioritized (the service does not assign DSCP markings itself), and the user can specify DSCP markings at both the template level and site detail pages. By marking DSCP values for prioritization, the network can keep the network running efficiently, even during times of heavy network traffic. Additionally, in order for the network prioritization to function properly, the queue structure must be consistent across all sites.

Every SD-WAN network is set with a default queue structure and DSCP mappings. QoS queue structure can be changed by creating a new configuration template, and DSCP mapping changes are available through either configuration templates for multi-site changes, or individually at the site level.

Making QoS changes in ActiveCore

To make a QoS change, the user starts by creating a new template under the Service Configuration tab. The user must also select the QoS Profile checkbox.

As shown in the image below, the Peak Information Rate (PIR) and Committed Information Rate (CIR) are fixed values as part of the queue structure.

On this page, the user can add/edit DSCP markings to each queue. 

The following image shows the process for adding a new DSCP marking.

The image below shows the new DSCP marking added to the list. The user can also edit existing DSCP markings as necessary.

On the VPNs & sites page, ActiveCore will notify the user that the QoS queue change will be implemented at all sites.

Finally, the user has the option to either deploy the new QoS changes immediately or save the desired settings for a later date. The image below shows the user choosing to deploy the new QoS changes immediately to the sites.


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