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RFC 1771:A Border Gateway Protocol 4 (BGP-4)
RFC-Ref

A Border Gateway Protocol 4 (BGP-4)


1. Acknowledgements
2. Introduction
3. Summary of Operation
3.1. Routes: Advertisement and Storage
3.2. Routing Information Bases
4. Message Formats
4.1. Message Header Format
4.2. OPEN Message Format
4.3. UPDATE Message Format
4.4. KEEPALIVE Message Format
4.5. NOTIFICATION Message Format
5. Path Attributes
5.1. Path Attribute Usage
5.1.1. ORIGIN
5.1.2. AS_PATH
5.1.3. NEXT_HOP
5.1.4. MULTI_EXIT_DISC
5.1.5. LOCAL_PREF
5.1.6. ATOMIC_AGGREGATE
5.1.7. AGGREGATOR
6. BGP Error Handling.
6.1. Message Header error handling.
6.2. OPEN message error handling.
6.3. UPDATE message error handling.
6.4. NOTIFICATION message error handling.
6.5. Hold Timer Expired error handling.
6.6. Finite State Machine error handling.
6.7. Cease.
6.8. Connection collision detection.
7. BGP Version Negotiation.
8. BGP Finite State machine.
9. UPDATE Message Handling
9.1. Decision Process
9.1.1. Phase 1: Calculation of Degree of Preference
9.1.2. Phase 2: Route Selection
9.1.2.1. Breaking Ties (Phase 2)
9.1.3. Phase 3: Route Dissemination
9.1.4. Overlapping Routes
9.2. Update-Send Process
9.2.1. Internal Updates
9.2.1.1. Breaking Ties (Internal Updates)
9.2.2. External Updates
9.2.3. Controlling Routing Traffic Overhead
9.2.3.1. Frequency of Route Advertisement
9.2.3.2. Frequency of Route Origination
9.2.3.3. Jitter
9.2.4. Efficient Organization of Routing Information
9.2.4.1. Information Reduction
9.2.4.2. Aggregating Routing Information
9.3. Route Selection Criteria
9.4. Originating BGP routes
10. Appendix 1. BGP FSM State Transitions and Actions.
11. Appendix 2. Comparison with RFC1267
12. Appendix 3. Comparison with RFC 1163
13. Appendix 4. Comparison with RFC 1105
14. Appendix 5. TCP options that may be used with BGP
15. Appendix 6. Implementation Recommendations
15.1. Multiple Networks Per Message
15.2. Processing Messages on a Stream Protocol
15.3. Reducing route flapping
15.4. BGP Timers
15.5. Path attribute ordering
15.6. AS_SET sorting
15.7. Control over version negotiation
15.8. Complex AS_PATH aggregation
16. References
17. Security Considerations
18. Editors' Addresses

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