BGP基础之origin属性.doc

BGP基础之origin属性 2007/1/24 2:45:18 | By: wangyang 一 试验说明：在本实验中我们要分别建立IBGP邻居和EBGP邻居。然后研究一下BGP路由的origin属性。这个属性有3个值，分别为：1 IGP：当使用 bgp network 命令或将IGP路由重分布进BGP中。在BGP路由表中起源于IGP的路由用“i”表示2 EGP：通过BGP学习到的路由。在BGP路由表中起源于EGP的路由用“e”表示3 incomplete:当路由重分布进BGP时，即无法确定路由的始发者时，在BGP路由表中用“？”表示 二 基本配置：1 配置底层联通由于我的底层拓扑是帧中继，所以先要把帧中继配通。下面是配置RTAinterface Serial1/0 no ip address encapsulation frame-relayno frame-relay inverse-arp frame-relay lmi-type ansiinterface Serial1/0.21 point-to-point ip address 150.10.30.1 255.255.0.0 frame-relay interface-dlci 201 interface Serial1/0.23 point-to-point ip address 170.10.20.1 255.255.0.0 frame-relay interface-dlci 203 RTBinterface Loopback1 ip address 190.10.50.1 255.255.255.0interface Serial1/0 ip address 175.10.40.2 255.255.0.0 encapsulation frame-relayframe-relay map ip 175.10.40.1 401 broadcast no frame-relay inverse-arp frame-relay lmi-type ansi RTEinterface Loopback1 ip address 170.10.0.1 255.255.255.0interface Serial1/0 ip address 170.10.20.2 255.255.255.0 encapsulation frame-relay frame-relay map ip 170.10.20.1 302 broadcast no frame-relay inverse-arp frame-relay lmi-type ansi经测试底层已经联通。 2 配置IGP协议要在AS 100中配置IGP协议，首先建立IGP的连通性，本实验我们选用EIGRP作为IGP协议，现在进行配置。RTARTA(config)#router eigrp 90RTA(config-router)#no auto-summary RTA(config-router)#network 150.10.0.0RTA(config-router)#passive-interface s1/0.23RTCRTC(config)#router eigrp 90RTC(config-router)#no auto-summary RTC(config-router)#network 150.10.0.0RTC(config-router)#network 175.10.0.0RTBRTB(config)#router eigrp 90RTB(config-router)#no auto-summary RTB(config-router)#net 175.10.0.0RTB(config-router)#network 190.10.50.0 RTA#sh ip route 170.10.0.0/24 is subnetted, 1 subnetsC 170.10.20.0 is directly connected, Serial1/0.23 190.10.0.0/24 is subnetted, 1 subnetsD 190.10.50.0 90/2809856 via 150.10.30.2, 00:21:34, Serial1/0.21D 175.10.0.0/16 90/2681856 via 150.10.30.2, 00:23:10, Serial1/0.21C 150.10.0.0/16 is directly connected, Serial1/0.21EIGRP路由已经可以正常学习到。 3 配置BGPRTA router bgp 100 no synchronization network 150.10.0.0 neighbor 170.10.20.2 remote-as 300 neighbor 175.10.40.2 remote-as 100 no auto-summaryRTBrouter bgp 100 no synchronization network 190.10.50.0 mask 255.255.255.0 neighbor 150.10.30.1 remote-as 100 no auto-summaryRTErouter bgp 300 no synchronizationnetwork 170.10.0.0 mask 255.255.255.0 neighbor 170.10.20.1 remote-as 100 no auto-summary 4 配置静态路由在RTA上配置一条静态路由，然后重分布到BGP中RTA(config)#ip route 190.10.0.0 255.255.0.0 null 0RTA(config)#router bgp 100RTA(config-router)#redistribute static 三 试验测试：分别查看RTA和 RTE的BGP路由表RTA#sh ip bgpBGP table version is 5, local router ID is 170.10.20.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal, r RIB-failure, S StaleOrigin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path* 150.10.0.0 0.0.0.0 0 32768 i* 170.10.0.0/24 170.10.20.2 0 0 300 i* 190.10.0.0 0.0.0.0 0 32768 ?*i190.10.50.0/24 175.10.40.2 0 100 0 iRTE#sh ip bgpBGP table version is 5, local router ID is 170.10.0.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal, r RIB-failure, S StaleOrigin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path* 150.10.0.0 170.10.20.1 0 0 100 i* 170.10.0.0/24 0.0.0.0 0 32768 i* 190.10.0.0 170.10.20.1 0 0 100 ?* 190.10.50.0/24 170.10.20.1 0 100 i通过BGP路由表我们可以看到：RT