Tim's Technology Gauntlet Wiki - cisco:bgp
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2026-05-10T17:29:28+00:00Tim's Technology Gauntlet Wiki
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BGP Notes
* Well-known mandatory attribute
* AS_PATH
* Includes a complete listing of all ASNs that the prefix advertisement has traversed from its source AS.
* Is a loop-prevention mechanism.
* If a router receives a prefix advertisement with its AS listed in the AS_PATH, it discards the prefix because the router thinks the advertisement forms a loop.text/html2025-02-17T23:36:47+00:00Anonymous (anonymous@undisclosed.example.com)ip_routing_notes
https://tim.army/doku/doku.php?id=cisco:bgp:ip_routing_notes&rev=1739835407&do=diff
IP Routing Notes
Chapter 10text/html2025-02-17T23:36:47+00:00Anonymous (anonymous@undisclosed.example.com)lesson_1
https://tim.army/doku/doku.php?id=cisco:bgp:lesson_1&rev=1739835407&do=diff
BGP Fundamentals Lesson 1
* BGP is a Answerpath-vector routing ++ protocol.
* BGP message types:
* OPEN
* UPDATE
* NOTIFICATION
* AnswerKEEPALIVE ++
* This BGP attribute ensure a loop-free path for routes. AnswerAS_PATH ++
* For more scalability and configurabilitytext/html2025-02-17T23:36:47+00:00Anonymous (anonymous@undisclosed.example.com)lessons
https://tim.army/doku/doku.php?id=cisco:bgp:lessons&rev=1739835407&do=diff
BGP Lessons
BGP Fundamentals Lesson 1text/html2025-02-17T23:36:48+00:00Anonymous (anonymous@undisclosed.example.com)path_attributes
https://tim.army/doku/doku.php?id=cisco:bgp:path_attributes&rev=1739835408&do=diff
BGP Path Attributes
* Well-known mandatory
* Must be recognized by all BGP implementations and included with every prefix advertisement
* Well-known discretionary
* May or may not be included with every prefix advertisement
* Optional transitive