14.1 提前老化 LSA.......................................................................................................................73
15 虚拟通道...........................................................................................................................................73
16 计算路由表 ......................................................................................................................................74
16.1 计算一个区域的最短路径树................................................................................................74
16.1.1 计算下一跳.................................................................................................................77
16.2 计算区域间路径....................................................................................................................77
16.3 查看传输区域的 Summary-LSA...........................................................................................78
16.4 计算 AS 外部路径 ................................................................................................................79
16.4.1 外部路径参数.............................................................................................................80
16.5 增量更新--Summary-LSA.....................................................................................................80
16.6 增量更新--AS-external-LSA.................................................................................................81
16.7 路由表改变引起的事件........................................................................................................81
16.8 等值多路径............................................................................................................................81
脚注 .......................................................................................................................................................81
引用........................................................................................................................................................83
A OSPF 数据格式..................................................................................................................................84
A.1 OSPF 包的封装.......................................................................................................................84
A.2 选项域.....................................................................................................................................85
A.3 OSPF 包格式...........................................................................................................................85
A.3.1 OSPF 包头....................................................................................................................86
A.3.2 Hello 包.........................................................................................................................87
A.3.3 数据库描述包/DD 包..................................................................................................88
A.3.4 连接状态请求包/LSR 包.............................................................................................89
A.3.5 连接状态更新包/LSU 包.............................................................................................89
A.3.6 连接状态确认包/LSAck 包.........................................................................................90
A.4 LSA 格式 ................................................................................................................................91
A.4.1 LSA 头部 .....................................................................................................................91
A.4.2 Router-LSA..................................................................................................................92
A.4.3 Network-LSA...............................................................................................................94
A.4.4 Summary-LSA.............................................................................................................94
A.4.5 AS-external-LSA..........................................................................................................95
B 结构常量.............................................................................................................................................97
C 可配置变量.........................................................................................................................................97
C.1 全局参数..................................................................................................................................98
C.2 区域参数 ................................................................................................................................98
C.3 路由器接口参数.....................................................................................................................99
C.4 虚拟通道参数 ......................................................................................................................100
C.5 NBMA 网络参数...................................................................................................................100
C.6 点对多点网络参数...............................................................................................................100
C.7 主机路径参数........................................................................................................................100
D 验证...................................................................................................................................................101
D.1 空验证...................................................................................................................................101
D.2 简单口令验证 ......................................................................................................................101
D.3 密码验证...............................................................................................................................101
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