实验:EIGRP浮动汇总路由配置思科认证

文章作者 100test 发表时间 2009:07:08 01:41:21
来源 100Test.Com百考试题网


  实验拓扑:

  接口连接:
  Router1 S0/0 <.---->. Router2 S0/0
  Router2 S0/1 <.---->. Router3 S0/0
  Router1 S0/1 <.---->. Router4 S0/0
  Router3 S0/1 <.---->. Router4 S0/1
  VPCS V0/1 <.---->. Router1 E1/0
  VPCS V0/2 <.---->. Router3 E1/0
  实验原理:
  在R1\R2\R3\R4上均运行EIGRP路由协议。 R4通过S0/1向R3通告一条0.0.0.0 0.0.0.0的汇总路由,并将这条浮动路由的管理距离设置为250,于是在网络连通的情况下R3上到达200.1.1.0/24网段的路由经过R2,而在R2与R3链路故障的时候,通过R3前往200.1.1.0/24的数据包会通过R4(R3拓扑表中,默认路由由A变为P)
  关键配置:
  R1:
  interface Serial0/0
  ip address 192.168.1.1 255.255.255.0
  serial restart-delay 0
  !
  interface Serial0/1
  ip address 192.168.3.1 255.255.255.0
  serial restart-delay 0
  !
  interface Ethernet1/0
  ip address 200.1.1.254 255.255.255.0
  half-duplex
  !
  router eigrp 100
  network 192.168.1.0
  network 192.168.3.0
  network 200.1.1.0
  no auto-summary
  R2、R3略,参照R1进行接口IP和路由协议的配置
  重点看下R4的配置
  R4:
  interface Serial0/0
  ip address 192.168.3.2 255.255.255.0
  serial restart-delay 0
  !
  interface Serial0/1
  ip address 192.168.4.1 255.255.255.0
  ip summary-address eigrp 100 0.0.0.0 0.0.0.0 250(向R3通过默认路由,管理距离高于EIGRP默认值)!
  router eigrp 100
  network 192.168.3.0
  network 192.168.4.0
  auto-summary
  查看结果:
  1.R2和R3之间链路正常时
  a) R3的路由表:
  R3#sh ip route
  Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
  D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
  N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
  E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
  i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
  ia - IS-IS inter area, * - candidate default, U - per-user static route
  o - ODR, P - periodic downloaded static route
  Gateway of last resort is 192.168.4.1 to network 0.0.0.0
  D 200.1.1.0/24 [90/2707456] via 192.168.2.1, 00:00:02, Serial0/0
  C 200.1.2.0/24 is directly connected, Ethernet1/0
  C192.168.4.0/24 is directly connected, Serial0/1
  D192.168.1.0/24 [90/2681856] via 192.168.2.1, 00:00:02, Serial0/0
  C192.168.2.0/24 is directly connected, Serial0/0
  D192.168.3.0/24 [90/3193856] via 192.168.2.1, 00:00:02, Serial0/0
  D* 0.0.0.0/0 [90/2681856] via 192.168.4.1, 00:00:00, Serial0/1
  b)R3的拓扑表:
  R3#sh ip eigrp topology
  IP-EIGRP Topology Table for AS(100)/ID(200.1.2.254)
  Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
  r - reply Status, s - sia Status
  A 0.0.0.0/0, 1 successors, FD is Inaccessible
  1 replies, active 00:00:00, query-origin: Successor Origin
  Remaining replies:
  via 192.168.2.1, r, Serial0/0
  P 192.168.1.0/24, 1 successors, FD is 2681856
  via 192.168.2.1 (2681856/2169856), Serial0/0
  P 192.168.2.0/24, 1 successors, FD is 2169856
  via Connected, Serial0/0
  P 192.168.3.0/24, 1 successors, FD is 3193856
  via 192.168.2.1 (3193856/2681856), Serial0/0
  P 192.168.4.0/24, 1 successors, FD is 2169856
  via Connected, Serial0/1
  P 200.1.1.0/24, 1 successors, FD is 2707456
  via 192.168.2.1 (2707456/2195456), Serial0/0
  P 200.1.2.0/24, 1 successors, FD is 281600
  via Connected, Ethernet1/0
  2.R2的S0/1设置为DOWN,观察R3路由表和拓扑表
  a)R3路由表:
  R3#sh ip route
  Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
  D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
  N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
  E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
  i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
  ia - IS-IS inter area, * - candidate default, U - per-user static route
  o - ODR, P - periodic downloaded static route
  Gateway of last resort is 192.168.4.1 to network 0.0.0.0
  C200.1.2.0/24 is directly connected, Ethernet1/0
  C192.168.4.0/24 is directly connected, Serial0/1
  C192.168.2.0/24 is directly connected, Serial0/0
  D* 0.0.0.0/0 [90/2681856] via 192.168.4.1, 00:00:05, Serial0/1
  b)R3的拓扑表:
  R3#sh ip eigrp topology
  IP-EIGRP Topology Table for AS(100)/ID(200.1.2.254)
  Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
  r - reply Status, s - sia Status
  P 0.0.0.0/0, 1 successors, FD is 2681856
  via 192.168.4.1 (2681856/2169856), Serial0/1
  P 192.168.4.0/24, 1 successors, FD is 2169856
  via Connected, Serial0/1
  P 200.1.2.0/24, 1 successors, FD is 281600
  via Connected, Ethernet1/0
  该实验说明,当R2和R3链路正常是,通过R3去往PC1的数据包不通过R4,只有当R2、R3间链路出现故障,默认路由才启用。
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