Not every data-center fabric is an EVPN fabric. Some are a plain routed Clos; some are still two switches in a rack. netlld ships six real Arista fabrics and documents all six — so how does it know which design it is looking at?
Nine scenes: what it reads out of AVD files and running-configs, what you declare in group_vars, what you pick on the form, and then the same question answered for an EVPN fabric, a routed Clos, a collapsed MLAG pair and a three-tier multi-pod.
Prefer to be talked through it? Press Play with narration below the film and the original voice-over drives the frames. Scroll at any point to take over.
↓ Scroll to playWhen the source does not settle the design, netlld leaves the field empty, prints “not stated in the source” and raises it as a design finding. People build networks from these documents, so a design label that is wrong is far more dangerous than one that is missing.
Every number on every slide in this walkthrough was read out of the sample fabrics at render time rather than typed into the picture — the same rule the tool applies to the documents it writes.