An SD-WAN rule is used to route the desired traffic and dynamically forward the traffic to the best link with the help of SLA. There are three modes for SD-WAN rules:
  • Best Quality: Selects the best link in the network performance parameters you desire.
  • Maximized Bandwidth: Selects the link to fully utilize the Internet bandwidth.
  • Preferred Link: Selects a higher priority link to forward traffic to.
Cloud Edge uses the DPI engine to detect traffic and cache the identity to implement application-aware routing.
Use SD-WAN rules to do dynamic path selection for WAN traffic between SD-WAN member interfaces.
SD-WAN rules have the following features and characteristics:
  • The default SD-WAN rule can do load balance by source IP, source-destination IP, sessions or volume. No SLA can be configured in the default rule.
  • For the default SD-WAN rule, the weights of Session and Volume are in percentage. The sum of weights must be 100%.
  • You can define a maximum of 200 SD-WAN rules (including one default rule).
Do the following at Gateways → (Selected Gateway) → SD-WAN → Rules:
  • View the list of existing rules
  • Add, edit, duplicate, and delete rules
  • Move rule priority
  • Enable and disable rules
  • Search
Note
Note
Deploy SD-WAN settings by clicking the Deploy All button (all configurations are deployed at the same time, no separate deployment for SD-WAN settings.)
Note
Note
You cannot disable, delete, move, or duplicate the default SD-WAN rule.
There are 3 kinds of events that will trigger SD-WAN rules to reroute the traffic:
  • Interface down: The physical condition of this interface is down. For example, the cable is unplugged, the interface has hardware problems, or the directed interface connection is disrupted.
  • SLA down: The traffic from the Cloud Edge gateway to monitor server fails to receive response exceeding the value of Failure Threshold that the user has configured.
  • Failure to meet SLA: The SLA performance detection data exceeds the threshold that the user has configured.
For all the Best Quality strategies, as the strategy itself already specifies the performance metrics, the SLA parameter of the selected Health Check SLA will not take effect.
For the Maximized Bandwidth and Preferred Link strategies, if one of the two WAN links fails to meet an SLA parameter, it will reroute the traffic to an alternative link.
The other 2 events will take effect on rerouting the traffic on all kinds of strategies.
Also, for all 3 kinds of events mentioned above, the priority goes in the order listed below:
  1. Interface down (highest)
  2. SLA down (medium)
  3. Failure to meet SLA (lowest)
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