Describes network bandwidth testing capabilities that detect bandwidth-related network problems using the Iperf3 tool.
A speed test is a network diagnostic tool that
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uses Iperf3 to detect bandwidth-related network problems
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measures upload and download speeds between devices, and
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determines available bandwidth in network connections.
Speed test types
Two types of speed test are available:
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Site-to-site speed test: Cisco SD-WAN Manager tests the network speed and available bandwidth between two devices. Cisco SD-WAN Manager designates one device as the source and the other as the destination.
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Internet speed test: Cisco SD-WAN Manager tests the network speed and available bandwidth between a device and an iperf3 server reachable by the network. Starting from Cisco vManage Release 20.10.1 and Cisco IOS XE Catalyst SD-WAN Release 17.10.1a, users can specify the IP address (or domain name) and port of an iperf3 server to perform Internet speed tests. Cisco SD-WAN Manager designates the device as the client and the iperf3 server as the server.
From Cisco Catalyst SD-WAN Manager Release 26.1.x, 10.1.x.x (a private IPv4 address) is used as the primary address for the speed test loopback. The 11.1.x.x address is retained as a secondary address to ensure backward compatibility with devices running older software versions.
You can remove the 11.1.x.x IP address range from the speedtest loopback interface using a CLI command. See the Disable backward-compatible IP address for site-to-site speed test section.
After you remove the 11.1.x.x IP address range, the device can no longer perform site-to-site speedtests with peers running older versions that support only the 11.1.x.x range.
The speed tests measure upload speed from the source device to the destination device, and measure download speed from the destination device to the source device.
The speed test traffic between edges ignore per-tunnel QoS on hub side and causes impact on the spoke side when WAN interface is congested.