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A practical, Bash-first playbook for documenting AI data-center networks so performance is repeatable and troubleshooting fast: what to capture (topology, MTU/ECN/QoS, IP plans, baselines, runbooks), lightweight tools via apt/dnf/zypper, scripts to inventory NICs/LLDP, iperf3 baselining, MTU/DSCP/RoCEv2 verification, and actionable runbooks—plus a real-world example and a monthly health-check workflow.