Establish a BGP session
01BGP runs over TCP and exchanges OPEN and KEEPALIVE messages before routing updates.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4.2 ↗
RFC 4271 · § 4.2EXAMPLE
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03
KEEPALIVE completes establishment before UPDATE processing.
KEEPALIVE completes establishment before UPDATE processing.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
The server TCP port is 179.
- The server TCP port is 179.
- OPEN negotiates BGP version, AS information, hold time, identifier, and optional parameters.
The drawing is a simplified worked example. Follow the linked RFC and its updates for implementation requirements.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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