Monitor performance SLA

SD-WAN diagnostics can be used to help maintain your SD-WAN solution

Monitoring SD-WAN link quality status

Link quality plays a significant role in link selection for SD-WAN. Investigate any prolonged issues with packet loss, latency, or jitter to ensure that your network does not experience degraded performance or an outage.

You can monitor the link quality status of SD-WAN interface members at Network > Performance SLA.

The live charts show the packet loss, latency, or jitter for the selected health check. Hover the cursor over a line in the chart to see the specific value for that interface at that specific time.

The table shows information about each health check, including the configured servers, link quality data, and thresholds. The colored arrow indicates the status of the interface when the last status check was performed: green means that the interface was active, and red means that the interface was inactive. Hover the cursor over the arrow for additional information.

Monitoring system event logs

The features adds an SD-WAN daemon function to keep a short, 10 minute history of SLA that can be viewed in the CLI.

Performance SLA results related to interface selection, session failover, and other information, can be logged. These logs can then be used for long-term monitoring of traffic issues at remote sites, and for reports and views in FortiAnalyzer.

The time intervals that Performance SLA fail and pass logs are generated in can be configured.

To configure the fail and pass logs' generation time interval:

config system sdwan
    config health-check
        edit "PingSLA"
            set sla-fail-log-period 30
            set sla-pass-log-period 60
        next
    end
end

To view the 10 minute Performance SLA link status history:

FGDocs # diagnose sys sdwan sla-log PingSLA 1
Timestamp: Fri Sep  4 10:32:37 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 4.455, jitter: 0.430, packet loss: 0.000%.
Timestamp: Fri Sep  4 10:32:37 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 4.461, jitter: 0.436, packet loss: 0.000%.
Timestamp: Fri Sep  4 10:32:38 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 4.488, jitter: 0.415, packet loss: 0.000%.
...
Timestamp: Fri Sep  4 10:42:36 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 6.280, jitter: 0.302, packet loss: 0.000%.
Timestamp: Fri Sep  4 10:42:37 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 6.261, jitter: 0.257, packet loss: 0.000%.
Timestamp: Fri Sep  4 10:42:37 2020, vdom root, health-check PingSLA, interface: wan2, status: up, latency: 6.229, jitter: 0.245, packet loss: 0.000%.

SLA pass logs

The FortiGate generates Performance SLA logs at the specified pass log interval (sla-pass-log-period) when SLA passes.

3: date=2019-02-28 time=11:53:26 logid="0100022925" type="event" subtype="system" level="information" vd="root" eventtime=1551383604 logdesc="Link monitor SLA information" name="ping" interface="R160" status="up" msg="Latency: 0.013, jitter: 0.001, packet loss: 0.000%, inbandwidth: 0Mbps, outbandwidth: 0Mbps, bibandwidth: 0Mbps, sla_map: 0x1"
7: date=2019-02-28 time=11:52:26 logid="0100022925" type="event" subtype="system" level="information" vd="root" eventtime=1551383545 logdesc="Link monitor SLA information" name="ping" interface="R160" status="up" msg="Latency: 0.013, jitter: 0.002, packet loss: 0.000%, inbandwidth: 0Mbps, outbandwidth: 0Mbps, bibandwidth: 0Mbps, sla_map: 0x1"

In the FortiAnalyzer GUI:

SLA fail logs

The FortiGate generates Performance SLA logs at the specified fail log interval (sla-fail-log-period) when SLA fails.

6: date=2019-02-28 time=11:52:32 logid="0100022925" type="event" subtype="system" level="notice" vd="root" eventtime=1551383552 logdesc="Link monitor SLA information" name="ping" interface="R150" status="down" msg="Latency: 0.000, jitter: 0.000, packet loss: 100.000%, inbandwidth: 0Mbps, outbandwidth: 200Mbps, bibandwidth: 200Mbps, sla_map: 0x0"
8: date=2019-02-28 time=11:52:02 logid="0100022925" type="event" subtype="system" level="notice" vd="root" eventtime=1551383522 logdesc="Link monitor SLA information" name="ping" interface="R150" status="down" msg="Latency: 0.000, jitter: 0.000, packet loss: 100.000%, inbandwidth: 0Mbps, outbandwidth: 200Mbps, bibandwidth: 200Mbps, sla_map: 0x0"

In the FortiAnalyzer GUI: