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AI Networking pinned
Four leaves, two vendors, one Ethernet Segment. Five configuration differences between Cumulus and Arista stand between the RFC and a working all-active bond — and none of them are in the RFC.
All four leaves agree on the Designated Forwarder. The host still receives every broadcast twice. Finding out why took a control group — and first required noticing my own packet capture was lying.
RA drives dynamic peer discovery in BGP unnumbered — and turning it off tears down established sessions instantly, with no flap and no timeout. Why, and what ND cache does and does not tell you.
Arista and Cisco NX-OS, an unnumbered eBGP session, an IPv4 route installed with an IPv6 next hop — and no forwarding. The fix is one interface command, and the reason is RFC 8950.
Capture filters versus display filters, the field extraction that turns a capture into data, and which of the two tools to reach for.
A Go library for driving network devices over SSH. The API, a working read and write example, and the error-handling behaviour that will bite you if you assume Netmiko semantics.
The subnet manager picks the routing engine, and the routing engine decides whether your fabric deadlocks. Min-hop, Up/Down, fat-tree and DragonFly+, and what each one is actually protecting you from.