Monitoring SD-WAN

You can use SD-WAN diagnostics to maintain an efficient and effective SD-WAN solution.

Monitoring SD-WAN link usage

The SD-WAN usage monitor shows traffic distribution between SD-WAN member interfaces in real time. You can view traffic distribution by bandwidth, volume, and sessions.

Monitor SD-WAN link usage - GUI

1. Go to Network > SD-WAN.
2. In the SD-WAN Usage section, select one of the following options to view SD-WAN traffic distribution between the member interfaces:
   • Bandwidth: Shows traffic distribution percentage of the bandwidth that each interface is using
   • Volume: Shows traffic distribution percentage of the volume of sessions for each interface
   • Sessions: Shows traffic distribution percentage of the number of sessions for each interface
3. Select Apply.

Monitoring SD-WAN traffic routing

You can see which applications are going through which destination interface in FortiView.

Monitor SD-WAN traffic routing – GUI

1. Go to FortiView > All Sessions.
2. View the information in the Destination Interface column.

Monitoring SD-WAN link quality status

You should monitor the link quality status of SD-WAN member interfaces, since link quality plays a significant role in link selection for SD-WAN. Investigate any prolonged issues with packet loss, latency, and jitter to ensure that your network doesn’t experience degraded performance or an outage.

Monitor SD-WAN link quality status - GUI

1. Go to Network > Performance SLA.
2. Monitor the information in the Packet Loss, Latency, and Jitter columns for each SLA.

The page displays arrows indicating the status of SD-WAN member interfaces. A green arrow indicates that the interface was active and a red arrow indicates that the interface was inactive when the FortiGate performed the status checks. The page also shows measurements for packet loss, latency, and jitter.

Monitoring system event logs

A FortiGate generates system event logs when an SD-WAN member interface route is added to or removed from the routing table. You can use system events to investigate any route failovers.

Monitor system event logs - GUI

1. Go to Log & Report > System Events.
2. Use information in system event logs related to SD-WAN to investigate issues.

Verifying SD-WAN traffic routing

You can verify that traffic is exiting the FortiGate through the SD-WAN member interfaces as configured.

Verify SD-WAN traffic routing - GUI

1. Go to Log & Report > Forward Traffic.
2. Use information in the Destination Interface column to verify that traffic is routing correctly.