Discrepancies in the path statistics (latency, jitter, packet loss) when a wireless link is configured as "active" versus when it is set to "HOT standby"

Products

• VMware VeloCloud SD-WAN

Issue/Introduction

For the hot/standby link, the heartbeat should be sent every 5 seconds, whereas for the active link, the heartbeat (HB) interval is 100 ms when high-priority traffic is flowing through the tunnel. If there is no high-priority traffic, the HB interval increases to 500 ms.

The SLA measurements are a function of sample frequency, more the samples available the more accurate the SLA measurement.

 

Resolution

Only measurements in active mode are relevant, in hot standby with samples every 5 secs the values could be fairly divergent especially for wireless links.