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首页rfc4271_中文版.pdf
本文讨论了一种自治系统路由协议,即边界网关协议(BGP)。 BGP宣告系统的主要功能是与其他BGP系统交换网络可达性信息。这个网络可达性信息包括历经的一系列自治系统(ASes)可达信息。该信息足以构建AS可达性连通图,对路由环路进行修剪,在AS级别,可能会执行一些策略决定。 BGP-4提供了一套支持无类别域间路由(CIDR)。这些机制包括支持公告一组目的地作为IP前缀,并消除BGP内网络“类别”的概念。BGP-4也介绍路由聚合机制,包括AS路径的聚合。
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Painting the night with sun, Lit in another time and place.
RFC 4271 BGP-4 Zhihao Tao
Page1
目录
目录 .............................................................................................................................................................. 1
备忘录状态................................................................................................................................................... 4
版权声明 ...................................................................................................................................................... 4
概述 .............................................................................................................................................................. 4
1. 介绍 .......................................................................................................................................................... 5
1.1 常用术语定义 ................................................................................................................................... 5
1.2 要求规范........................................................................................................................................... 6
2. 致谢 ........................................................................................................................................................ 6
3. 操作摘要................................................................................................................................................. 7
3.1 路由:公告和存储 ........................................................................................................................... 8
3.2 路由信息库....................................................................................................................................... 9
4. 消息格式................................................................................................................................................. 9
4.1 消息头部格式 ................................................................................................................................. 10
4.2 OPEN 消息格式 ................................................................................................................................ 10
4.3 UPDATE 消息格式 ............................................................................................................................ 12
4.4 KEEPALIVE 消息格式 ...................................................................................................................... 16
4.5 NOTIFICATION 信息格式 ................................................................................................................ 17
5. 路径属性............................................................................................................................................... 18
5.1 路径属性使用 ................................................................................................................................. 19
5.1.1 ORIGIN ..................................................................................................................................... 19
5.1.2 AS_PATH ................................................................................................................................... 19
5.1.3 NEXT_HOP ................................................................................................................................. 20
5.1.4 MULTI_EXIT_DISC ................................................................................................................... 21
5.1.5 LOCAL_PREF ............................................................................................................................. 22
5.1.6 ATOMIC_AGGREGATE ................................................................................................................. 22
5.1.7 AGGREGATOR ............................................................................................................................. 22
6. BGP 错误处理........................................................................................................................................ 23
6.1 消息头错误处理 ............................................................................................................................. 23
6.2 OPEN 消息错误处理 ........................................................................................................................ 23
Painting the night with sun, Lit in another time and place.
RFC 4271 BGP-4 Zhihao Tao
Page2
6.3 UPDATE 消息错误处理 .................................................................................................................... 24
6.4 NOTIFICATION 消息错误处理 ........................................................................................................ 25
6.5 HOLD 定时器超时错误处理 ............................................................................................................ 25
6.6 有限状态机错误处理 ..................................................................................................................... 25
6.7 终止 ................................................................................................................................................ 26
6.8 BGP 连接冲突检测 .......................................................................................................................... 26
7. BGP 版本协商........................................................................................................................................ 27
8. BGP 有限状态机(FSM) .......................................................................................................................... 27
8.1 BGP FSM 的事件 .............................................................................................................................. 28
8.1.1 可选会话属性相关联的可选事件 ......................................................................................... 28
8.1.2 管理事件 ................................................................................................................................. 31
8.1.3 计时器事件 ............................................................................................................................. 33
8.1.4 基于 TCP 连接的事件 .............................................................................................................. 34
8.1.5 基于 BGP 消息的事件 ......................................................................................................... 36
8.2 FSM 介绍.......................................................................................................................................... 37
8.2.1 FSM 定义 .................................................................................................................................. 37
8.2.2 有限状态机 ............................................................................................................................. 39
9. UPDATE 消息处理 .................................................................................................................................. 52
9.1 决策过程......................................................................................................................................... 53
9.1.1 阶段 1:计算偏好度 ............................................................................................................... 53
9.1.2 阶段 2:选路 .......................................................................................................................... 54
9.1.3 阶段 3:路由传播 .................................................................................................................. 57
9.1.4 重叠路由 ................................................................................................................................. 57
9.2 UPDATE 发送过程 ............................................................................................................................ 58
9.2.1 控制路由业务开销 ................................................................................................................. 58
9.2.2 路由信息的有效组织 ............................................................................................................. 59
9.3 路由选择标准 ................................................................................................................................. 61
9.4 始发 BGP 路由 ................................................................................................................................. 61
10. BGP 定时器.......................................................................................................................................... 62
附录 A. 与 RFC 1771 的比较 .................................................................................................................... 63
附录 B. 与 RFC 1267 的比较 .................................................................................................................... 63
附录 C. 与 RFC 1163 的比较 .................................................................................................................... 63
Painting the night with sun, Lit in another time and place.
RFC 4271 BGP-4 Zhihao Tao
Page3
附录 D. 与 RFC 1105 的比较 .................................................................................................................... 64
附录 E. 可能与 BGP 一起使用的 TCP 选项 .............................................................................................. 64
附录 F. 实现建议 ...................................................................................................................................... 64
附录 F.1 每个消息的多个网络 ............................................................................................................ 64
附录 F.2 减少路线震荡 ........................................................................................................................ 65
附录 F.3 路径属性排序 ........................................................................................................................ 65
附录 F.4 AS_SET 排序 ........................................................................................................................... 65
附录 F.5 控制版本谈判 ........................................................................................................................ 65
附录 F.6 复杂的 AS_PATH 聚合 ............................................................................................................ 65
安全注意事项............................................................................................................................................. 66
IANA 注意事项............................................................................................................................................ 67
Painting the night with sun, Lit in another time and place.
RFC 4271 BGP-4 Zhihao Tao
Page4
Network Working Group Y. Rekhter, Ed.
Request for Comments: 4271 T. Li, Ed.
Obsoletes: 1771 S. Hares, Ed.
Category: Standards Track January 2006
Thank Zhihao Tao for your hard work in Translation. The translator spent
countless nights and weekends, using his hard work to make it convenient
for everyone.
If you have any questions, please send a email to zhihao.tao@outlook.com
边界网关协议 4(BGP-4)
备忘录状态
本文档为互联网社区规定的互联网标准化协议,并请讨论和建议来改进。
请参考当前版本的“互联网官方协议标准”(STD 1)和该协议的状态。此备忘录的
传播不受限制。
版权声明
版权所有(C)互联网协会(2006)。
概述
本文讨论了一种自治系统路由协议,即边界网关协议(BGP)。
BGP 宣告系统的主要功能是与其他 BGP 系统交换网络可达性信息。这个网络可达性信
息包括历经的一系列自治系统(ASes)可达信息。该信息足以构建 AS 可达性连通图,对
路由环路进行修剪,在 AS 级别,可能会执行一些策略决定。
BGP-4 提供了一套支持无类别域间路由(CIDR)。这些机制包括支持公告一组目的地
作为 IP 前缀,并消除 BGP 内网络“类别”的概念。BGP-4 也介绍路由聚合机制,包括 AS
路径的聚合。
本文档作废 RFC 1771。
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