EIGRP wmmmmmmmmmmmm Cisco.com 深圳职业技术学院计算机系网络专业 006,Shenzhen Polytechnic.All rights reserved
© 2006, Shenzhen Polytechnic. All rights reserved. 1 EIGRP 深圳职业技术学院计算机系网络专业
教学目标（Objectives) wmm Cisco.com 1.EIGRP关键特征 (Key Characteristics of EIGRP) 2.EIGRP三张表 (EIGRP Maintains Three Tables) 3.后继和可行后继 Successor and Feasible Successor 4.可行距离和通告距离(FD and RD) 5.EIGRP数据结构(EIGRP Data Structure) 6.配置EIGRP(Configuring EIGRP) 7.验证EIGRP(Verifying EIGRP)
© 2006 Shenzhen Polytechnic. All rights reserved. 2 教学目标（ Objectives ） 1. EIGRP关键特征 （Key Characteristics of EIGRP ） 2. EIGRP三张表 （EIGRP Maintains Three Tables） 3.后继和可行后继 （ Successor and Feasible Successor ） 4.可行距离和通告距离（ FD and RD ） 5. EIGRP 数据结构（EIGRP Data Structure） 6.配置EIGRP（Configuring EIGRP） 7.验证EIGRP（Verifying EIGRP）
EIGRP关键特征(Key Characteristics of EIGRP) AIIEEEE Cisco.com (1)是高级距离向量路由协议，CSCO私有协议 It is an enhanced distance vector routing protocol. (2)用带宽、延迟、负载、可靠性作为度量值 Metric:bandwidth,delay,load,reliability (3)支持非等价负载均衡 Uses unequal-cost load balancing. (4)最大跳数为225 Maximum hop is 225 (5)采用DUAL算法计算到目的地的最短路径 Uses Diffused Update Algorithm(DUAL)to calculate the shortest path. (6)合并了距离向量路由协议和链路状态路由协议优点 Uses a combination of distance vector and link-state features (7)EIGRP用“EX”识别外部路由 EIGRP will tag routes by EX learned from any outside source as external
© 2006 Shenzhen Polytechnic. All rights reserved. 3 EIGRP关键特征（Key Characteristics of EIGRP ） （1）是高级距离向量路由协议，CISCO私有协议 It is an enhanced distance vector routing protocol. （2）用带宽、延迟、负载、可靠性作为度量值 Metric: bandwidth,delay,load,reliability （3）支持非等价负载均衡 Uses unequal-cost load balancing. （4）最大跳数为225 Maximum hop is 225 （5）采用DUAL算法计算到目的地的最短路径 Uses Diffused Update Algorithm (DUAL) to calculate the shortest path. （6）合并了距离向量路由协议和链路状态路由协议优点 Uses a combination of distance vector and link-state features （7）EIGRP用“EX”识别外部路由 EIGRP will tag routes by EX learned from any outside source as external
EIGRP三张表 (EIGRP Maintains Three Tables) www厦 Cisco.com 1.邻居表(Neighbor table) 在EIGRP中，邻居表最为重要 The neighbor table is the most important table in EIGRP. 2.拓扑表(Topology table) 在自治系统中，路由表由拓扑表计算 The topology table is made up of all the EIGRP routing tables in the autonomous system. 3.路由表(Routing table) 路申表是到达目标网络的最佳路径，路由器为每种被路由的协议维护 “张拓扑表和路由表。 The EIGRP routing table holds the best routes to a destination. Each EIGRP router maintains a topology table and routing table for each network protocol. 006ShenzhenPolytechnic.All rights reserved
© 2006 Shenzhen Polytechnic. All rights reserved. 4 EIGRP三张表 （EIGRP Maintains Three Tables） 1.邻居表（Neighbor table ） 在EIGRP中，邻居表最为重要 The neighbor table is the most important table in EIGRP. 2.拓扑表（Topology table ） 在自治系统中，路由表由拓扑表计算 The topology table is made up of all the EIGRP routing tables in the autonomous system. 3.路由表（Routing table ） 路由表是到达目标网络的最佳路径，路由器为每种被路由的协议维护 一张拓扑表和路由表。 The EIGRP routing table holds the best routes to a destination. Each EIGRP router maintains a topology table and routing table for each network protocol
后继(Successor) 厦 Cisco.com i have a route to net z with a metric of 5. TA Network Z RTB is successor to Net Z 后继路由器是到达指定目的最优的下一跳邻居路由器 A succesor is a neighbor router that is the next hop in a least-cost path to any given destination. 后继路由是主要路由。 A successor is a route selected as the primary route to use to reach a destination. 2006 Shenzhen Polytechnic Allriahts reserved
© 2006 Shenzhen Polytechnic. All rights reserved. 5 后继（ Successor ） 后继路由器是到达指定目的最优的下一跳邻居路由器 A succesor is a neighbor router that is the next hop in a least-cost path to any given destination. 后继路由是主要路由。 A successor is a route selected as the primary route to use to reach a destination
可行后继（Feasible Successor) IIWWIE Cisco.com have a route to Network RTY 通过指定可行后继路由器，EIGRP.路由器在后继路由器失效时，能够马上将 该路由安装到路由表 By identifying feasible successors,ElGRP router can immediately install alternate route if a successor fail. 可行后继是备份路由。 A feasible successor(FS)is a backup route. 006 Shenzhen Polytechnic.All rights reserved
© 2006 Shenzhen Polytechnic. All rights reserved. 6 可行后继（ Feasible Successor ） 通过指定可行后继路由器，EIGRP路由器在后继路由器失效时，能够马上将 该路由安装到路由表 By identifying feasible successors,EIGRP router can immediately install alternate route if a successor fail. 可行后继是备份路由。 A feasible successor (FS) is a backup route
可行距离和通告距离(FD and RD) Cisco.com 1.可行距离是到达目标网络最小的度量值 Feasible distance (FD is the lowest calculated metric to each destination. 2通告距离是邻居路由器通告它到达目标网络的 距离 Reported distance(RD)is the distance reported by an adjacent neighbor to a specific destination. 3.可行性条件(feasible condition):RD<FD 2006 ShenzhenPolytechnic.All rights reserved
© 2006 Shenzhen Polytechnic. All rights reserved. 7 可行距离和通告距离（ FD and RD ） 1.可行距离是到达目标网络最小的度量值 Feasible distance (FD ) is the lowest calculated metric to each destination. 2.通告距离是邻居路由器通告它到达目标网络的 距离 Reported distance (RD) is the distance reported by an adjacent neighbor to a specific destination. 3.可行性条件（feasible condition）：RD<FD
EIGRP算法(EIGRP Algorithm) Cisco.com
© 2006 Shenzhen Polytechnic. All rights reserved. 8 EIGRP 算法（EIGRP Algorithm ）
EIGRP数据结构(EIGRP Data Structure) wwwwwcmm Cisco.com 。Hello ·确认(Acknowledgment) ·更新(Update) 。查询(Query) 。应答(Reply)
© 2006 Shenzhen Polytechnic. All rights reserved. 9 EIGRP 数据结构（EIGRP Data Structure） • Hello • 确认（ Acknowledgment ） • 更新（ Update） • 查询 （ Query ） • 应答 （ Reply ）
Hello Cisco.com 1.EIGRP依靠hello包来发现、验证和再发现邻居路由器。 EIGRP relies on hello packets to discover,verify,and rediscover neighbor routers. 2.EIGRP发送hello包的周期，称为hello interval。 EIGRP routers send hellos at a fixed but configurable interval, called the hello interval. 3.在P网络中，EIGRP路由器使用组播地址224.0.0.10来发送hello包。 On IP networks,EIGRP routers send hellos to the multicast IP address224.0.0.10. 4.OSPF需要邻居有相同的hello和dead间隔，而EIGRP没有此限制。 OSPF requires neighbor routers to have the same hello and dead intervals to communicate.EIGRP has no such restriction. 006ShenzhenPolytechnic.Allrights reserved
© 2006 Shenzhen Polytechnic. All rights reserved. 10 Hello 1. EIGRP依靠hello包来发现、验证和再发现邻居路由器。 EIGRP relies on hello packets to discover, verify, and rediscover neighbor routers. 2. EIGRP发送hello包的周期，称为hello interval。 EIGRP routers send hellos at a fixed but configurable interval, called the hello interval . 3.在IP网络中，EIGRP路由器使用组播地址224.0.0.10来发送hello包。 On IP networks, EIGRP routers send hellos to the multicast IP address 224.0.0.10. 4.OSPF需要邻居有相同的hello和dead间隔，而EIGRP没有此限制。 OSPF requires neighbor routers to have the same hello and dead intervals to communicate. EIGRP has no such restriction