Route Protocol

@route and switch 比较

                                             route                                   switch

 OSI layer                           layer3                                    layer2

 address use                          ip                                           MAC

broadcasts                          blocks                                     forwards

@route protocol

外部网关协议

 EGP:BGP  Border Gateway Protocl

内部网关协议   IGP

RIP           Routing Informantion Protocol

IGRP        Interior Gateway Routing Protocol

EIGRP      Enhanced Interior Gateway Routing Protocol

OSPFF      Open Shortest Path  First( 开放最短路由优先）

 An autonomic systems is a collection of networks uander a common administrative domain.IGPs operate within an autonomsystem.EGPs connect diffierent autonomic systems

Routing Protocols are used between routers to determine paths and maintain routing tables.

Once the path is determined a router can route a routed protocol.

@当一个路由器收到从不同的 路由协议里学到的同一个路由的时候，首先会进行ADL（管理距离）竞争，择优而走。

        connected   0

        static           1

        RIP              120

        IGRP            100

        EGIRP          90

        OSPF           110

        BGP              20/200

@有类路由和无类路由

Classfull routing protocol do not include the subnet mask with the toute advertisement

如 RIP IGRP

Classless routing protocols include the subnet maskwith the route advertisement

OSPF EIGRP  IS-IS