RFC-grounded notes
Each topic starts with the relevant RFC sections, then narrows into terms, state machines, messages, and the parts that are easiest to misunderstand.
What this is
Learning infrastructure for protocols that run the Internet.
The studio keeps a narrow focus: routing, verification, packet-level observation, and notes that can be reproduced on a laptop.
Separated learning tracks
Beginner work stays in hands-on containerlab lessons, while intermediate work lives in Protocol in Code as GitHub source reading and logic-first explanation.
Future tooling
Small tools may appear as the notes grow, especially around BGP visibility, RPKI checks, and protocol debugging workflows.
Coming next
Two separate courses: beginner hands-on, intermediate code reading.
The beginner path stays as the traditional containerlab course. The intermediate path is a fully separate Protocol in Code course, where the code lives on GitHub and the explanations live on this site.
Choose the track that matches your level.
The beginner course is for learning by running containerlab. The intermediate course is for reading protocol logic like code, with BGP as the first subject and the source files hosted in GitHub.
Beginner
containerlab と FRRouting を動かしながら BGP を学ぶ独立コース。Lab 01-03 で完結する。
Intermediate
Protocol in Code は独立した中級コース。GitHub の source file を開き、neighbor の入力や best path selection の条件分岐を読む。
Intermediate course
Protocol in Code now includes BGP and OSPF, with code on GitHub.
The intermediate path reads protocol logic as code: required inputs, state changes, and decision branches. The source lives in the public `protocol-in-code` repository.
github.com/pathvector-studio/protocol-in-code BGP Session 01 session.py -> neighbor inputs Session 02 update.py -> state mutations ... Session 15 speaker.py -> toy speaker loop OSPF Session 01 hello.py -> Hello gate Session 02 neighbor.py -> adjacency state Session 03 dr_election.py -> DR / BDR election Session 04 lsa.py -> Router-LSA object Session 05 flooding.py -> LSA forwarding Session 06 lsdb.py -> versioned store Session 07 spf.py -> shortest-path tree Session 08 routing.py -> route derivation Session 09 cost.py -> winner selection Session 10 recompute.py -> topology recompute Session 11 areas.py -> area summary Session 12 speaker.py -> toy speaker loop
Public status
Small, slow, and reproducible.
Now
The beginner containerlab course is public as Lab 01-03, and the intermediate Protocol in Code course now publishes separate BGP and OSPF tracks.
Next
The intermediate BGP and OSPF tracks now point at real GitHub source files and will keep getting fuller code-by-code explanation.
Later
IS-IS, DNS, TCP, TLS, HTTP, and QUIC can join the intermediate Protocol in Code format after the BGP and OSPF modules are solid.
Contact
Protocol notes, corrections, and references are welcome.
Send short notes, RFC pointers, or corrections to the public contact address.