Provides troubleshooting information for resolving common speed test issues including DNS resolution, server connectivity, and configuration problems.
The speed test uses iperf3 with the TCP protocol. The speed test result depends on the latency and packet loss between the client and server.
The built-in speed test servers are not based on geographic proximity, so end users are highly recommended to input and use an iPerf3 server located near them.
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Error Information |
Possible Root Cause |
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Failed to resolve iperf server address |
DNS server is not configured at edge device or is unable to resolve the iperf server from the configured DNS server at edge device. |
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Speed test servers not reachable |
The speed test server ping failed. The edge device cannot reach the server IP. |
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iPerf client: unable to connect stream: Resource temporarily unavailable |
Unable to connect to the speed test server. Access may be blocked by access-control list (ACL) permissions. |
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iPerf client: unable to connect to server |
The iPerf3 server is not providing the test service at the user-specified port or default port 5201. |
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Device Error: Speed test in progress |
The selected source or destination device is performing a speed test and cannot start a new one. |
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Device error: Failed to read server configuration |
The data stream configuration is missing. Workaround: Running a CLI command at the edge device and clearing the Cisco Catalyst SD-WAN control connections can fix the issue. |
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Speed test session has timed out |
The speed test has not successfully completed in 180 seconds. This might be because the edge device has lost the control connection to Cisco SD-WAN Manager during the speed testing. |