Mellanox What Just Happened (WJH)
Cumulus Linux supports the What Just Happened (WJH) feature for Mellanox switches to stream detailed and contextual telemetry for off-box analysis with tools, such as Cumulus NetQ . This advanced streaming telemetry technology provides real time visibility into problems in the network, such as hardware packet drops due to buffer congestion, incorrect routing, ACL or layer 1 problems.
When WJH capabilities are combined with the analytics engine of Cumulus NetQ, you have the ability to hone in on any loss, anywhere in the fabric, from a single management console. You can view any current or historic drops and specific drop reasons, and also identify any flow or endpoints and pin-point exactly where communication is failing in the network.
WJH is enabled by default on a Mellanox switch; no configuration is required in Cumulus Linux.