cisco

A DCI link goes down at 18:00. Nexus Dashboard's syslog export lands seven seconds later, the triage turns it into one incident, the investigation names the link, and the fix goes through NDFC with an approval bound to the exact lines a human read. Part 2 of FabricSRE.

Nexus Dashboard 4.3.1 exposes enough over its GA API to build a real SRE agent. Part 1: the rules, the fabric twin, a ten-hypothesis investigation with evidence on every line, and the fault harness that proves it names the right failure.

Build two VXLAN EVPN sites with an NDFC-managed ISN and a stretched subnet in Nexus Dashboard 4.1 using an eBGP Multi-AS underlay. Follow every screen, deployment gotcha, validation step, and the Python automation that rebuilds it end to end.

The same fabric as Part 2, built by one Ansible playbook against the NDFC API: nine stages, every read-back recorded, and the same ping matrix at the end.

Create the fabric, discover the switches, pair the leaves, add a VRF and networks, attach the host ports, and prove it with a ping matrix. One NDFC screen at a time.

Deploy Nexus Dashboard 4.3 as an EVE-NG node, bootstrap it from the console, bring up the cluster, and boot a six-switch N9Kv fabric under containerlab. Every step, with the screen it produces.

A MAC address leaves a Cisco datacenter and reappears behind a Juniper leaf in another one. Watch RFC 7432 do its job across the multisite DCI: the counter climbing 0, 1, 2, the losing leaf yielding, and the exact BGP packets that carried each move, captured on the interconnect.