【正文】 (2) 引入其它路由協(xié)議為了實(shí)現(xiàn)全網(wǎng)互通，我們需要路由器能在不同協(xié)議之間交換路由信息或者全網(wǎng)運(yùn)行同一種路由協(xié)議，但實(shí)際網(wǎng)絡(luò)中往往需要運(yùn)行多種路由協(xié)議，所以我們在這里有必要介紹如何讓不同路由協(xié)議交換路由信息。這涉及到路由引入即引入其它路由協(xié)議發(fā)現(xiàn)的路由。下面是配置完路由引入后各路由器的配置信息和路由信息表：路由器A：[RouterA]dis cu Now create configuration... Current configuration ! version firewall enable sysname RouterA encryptcard fastswitch ! interface Aux0 async mode flow phymru 0 linkprotocol ppp ! interface Ethernet0 ip address ! interface Serial0 linkprotocol ppp ip address ! interface Serial1 linkprotocol ppp ! interface Serial2 linkprotocol ppp ! interface Serial3 linkprotocol ppp ! quit ip routestatic preference 60 ! return [RouterA]dis ip roRouting Tables: Destination/Mask Proto Pref Metric Nexthop Interface 路由器B：[RouterBrip]import direct cost 2[RouterBrip]import static cost 2[RouterB]dis cu Now create configuration... Current configuration ! version firewall enable sysname RouterB encryptcard fastswitch ! interface Aux0 async mode flow phymru 0 linkprotocol ppp ! interface Ethernet0 ip address ! interface Serial0 clock DTECLK1 linkprotocol ppp ip address ! interface Serial1 linkprotocol ppp ip address ! quit rip network network importroute static cost 2 importroute direct cost 2 ! quit ! quit ip routestatic preference 60 ! return[RouterB]dis ip roRouting Tables: Destination/Mask Proto Pref Metric Nexthop Interface 配置路由器C：[RouterCrip]import dir co 2[RouterCrip]import ospf co 2[RouterCrip]qu[RouterC]ospf[RouterCospf]import dir[RouterCospf]import rip[RouterCospf]dis cu Now create configuration... Current configuration ! version firewall enable sysname RouterC encryptcard fastswitch ! interface Aux0 async mode flow phymru 0 linkprotocol ppp ! interface Ethernet0 ip address ospf enable area ! interface Serial0 linkprotocol ppp ip address ospf enable area ! interface Serial1 clock DTECLK1 linkprotocol ppp ip address ! quit rip network network importroute ospf cost 2 importroute direct cost 2 ! quit ! ospf enable importroute rip importroute direct ! quit ! return[RouterCospf]dis ip rouRouting Tables: Destination/Mask Proto Pref Metric Nexthop Interface 路由器D：[RouterD]dis cu Now create configuration... Current configuration ! version firewall enable sysname RouterD encryptcard fastswitch ! interface Aux0 async mode flow phymru 0 linkprotocol ppp ! interface Ethernet0 ip address ospf enable area ! interface Serial0 clock DTECLK1 linkprotocol ppp ip address ospf enable area ! interface Serial1 linkprotocol ppp ! quit ospf enable ! quit ! return[RouterD]dis ip roRouting Tables: Destination/Mask Proto Pref Metric Nexthop Interface 從路由表可以看出，引入其他路由協(xié)議之后每個路由器的路由表都增加了幾條新的路由記錄，這就是通過路由引入從其它路由協(xié)議學(xué)習(xí)到的路由信息?，F(xiàn)在我們再次測試全網(wǎng)的互通情況，會發(fā)現(xiàn)各網(wǎng)段的主機(jī)都可以互通了。知道為什么了嗎？5. 實(shí)驗(yàn)小結(jié)：本實(shí)驗(yàn)完成了靜態(tài)路由和動態(tài)路由協(xié)議的配置，在實(shí)驗(yàn)過程中應(yīng)重點(diǎn)比較RIP RIP 2的特性，如對可變長子網(wǎng)掩碼的支持等；OSPF協(xié)議我們在此未做重點(diǎn)介紹，但它是實(shí)際中應(yīng)用最為廣泛的動態(tài)路由協(xié)議，應(yīng)注意后續(xù)學(xué)習(xí)。