DPS policies are used to determine the WAN circuit that is selected for specific users, applications and destinations. The selected paths can be a single WAN uplink or a group of WAN uplinks for traffic load balancing.


Dynamic path selection works based on a list of rules mapped in the policy, threshold settings based on SLAs, probe criteria defined to determine SLAs and load balancing algorithm.

 

Workflow of Dynamic Path selection:

Client connects to the network.
Authentication server authenticates the client and assigns role and then redirects clients to SD-WAN gateway.
The firewall classifies the session on the base of application.
Routing for user using application states the next hop is a VPN concentrator and path available as internet, LTE and MPLS.
If at any point the Measured SLA for link drops, the SD wan gateway steers the traffic through another active tunnel.

 

In our case DPS relies on loss, latency, jitter and utilization WAN performance measurements that are updated every few seconds per WAN link. Based on DPS policies the best WAN uplinks will steer traffic for specific users, applications, and roles.

 

 

Each branch gateway connects to one or more Internet, MPLS and cellular based WAN services using WAN ports.


Benefits:

Load balancing across links based on load balancing algorithm
Path selection on the base of policies for users and application
Supports MPLS, internet, metro and LTE
Monitoring dashboard informs the administrator of the DPS policies that are active and whether they are compliant with configured SLA thresholds