思科认证辅导:Eigrpsplithorizon丢失路由分析思科认证

文章作者 100test 发表时间 2010:01:01 12:32:39
来源 100Test.Com百考试题网


  我们测试的网络类型是帧中继(HUB-SPOKE),R1分别与R2和R3建立frame映射,R1为 hub端,2,3 分别为spoke 端 。R2只与 R1建立映射,R3也只与R1建立映射。
  R2-----R1------R3
  配置帧中继:
  R1配置:
  R1#conf t
  R1(config)#int lo 0
  R1(config-if)#ip add 1.1.1.1 255.255.255.0
  R1(config-if)#no sh
  R1(config-if)#int s0/0
  R1(config-if)#ip add 11.1.1.1 255.255.255.0
  R1(config-if)#encapsulation frame-relay
  R1(config-if)#no arp frame-relay
  R1(config-if)#no frame inverse-arp
  R1(config-if)#frame map ip 11.1.1.2 102 broadcast
  R1(config-if)#frame map ip 11.1.1.3 103 broadcast (帧中继的标准配置)
  R1(config-if)#no sh
  R2配置:
  R2(config-if)#int s0/0
  R2(config-if)#ip add 11.1.1.2 255.255.255.0
  R2(config-if)#no sh
  R2(config-if)#encapsulation frame-relay
  R2(config-if)#no arp frame-relay
  R2(config-if)#no frame inverse-arp
  R2(config-if)#frame map ip 11.1.1.1 201 broadcast
  R2(config-if)#no sh
  R3配置:
  R3(config-if)#int s0/0
  R3(config-if)#ip add 11.1.1.3 255.255.255.0
  R3(config-if)#encapsulation frame-relay
  R3(config-if)#no arp frame-relay
  R3(config-if)#no frame inverse-arp
  R3(config-if)#frame map ip 11.1.1.1 301 broadcast
  R3(config-if)#no sh
  查看帧中继建立情况
  R1#sh frame map
  Serial0/0 (up): ip 11.1.1.2 dlci 102(0x66,0x1860), static,
  broadcast,
  CISCO, status defined, active
  Serial0/0 (up): ip 11.1.1.3 dlci 103(0x67,0x1870), static,
  broadcast,
  CISCO, status defined, active
  R2#sh frame map
  Serial0/0 (up): ip 11.1.1.1 dlci 201(0xC9,0x3090), static,
  broadcast,
  CISCO, status defined, active
  R3#sh frame map
  Serial0/0 (up): ip 11.1.1.1 dlci 301(0x12D,0x48D0), static,
  broadcast,
  CISCO, status defined, active
  已经建立完毕
  测试连通性:
  R3#ping 11.1.1.1
  Type escape sequence to abort.
  Sending 5, 100-byte ICMP Echos to 11.1.1.1, timeout is 2 seconds:
  !!!!!(成功)
  Success rate is 100 percent (5/5), round-trip min/avg/max = 48/77/96 ms
  帧中继有水平分割,在rip协议中,帧中继的水平分割默认是被关闭的,在eigrp协议中 帧中继的水平分割默认是被打开的 可查看R1的S0/0接口
  R1#sh ip int s0/0
  Serial0/0 is up, line protocol is up
  Internet address is 11.1.1.1/24
  Broadcast address is 255.255.255.255
  Address determined by setup command
  MTU is 1500 bytes
  Helper address is not set
  Directed broadcast forwarding is disabled
  Multicast reserved groups joined: 224.0.0.9
  Outgoing access list is not set
  Inbound access list is not set
  Proxy ARP is enabled
  Local Proxy ARP is disabled
  Security level is default
  Split horizon is disabled
  ICMP redirects are always sent
  ICMP unreachables are always sent
  ICMP mask replies are never sent
  IP fast switching is enabled
  IP fast switching on the same interface is enabled
  IP Flow switching is disabled
  我们分别用 rip 和 eigrp做同样的实验,首先每台路由器启动RIP,通过查看路由表可以发现,R2 R3会学到对方的路由。

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