BSCI第三章实验之任务一,二(人邮自学指南BSCI)
www.net130.com     日期：2006-7-16    浏览次数：
出处：思科 思索

任务是删除上一次配置 没什么可说了,拓扑图以及实际用路由器名与书上路由器名对应关系,请查看[原创]BSCI第一章实验2之任务2(人邮自学指南BSCI)

未关闭S1前 R1
r1-2514#show ip route
Codes: C - connected, S - static, 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
       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 not set

C    1.0.0.0/8 is directly connected, Loopback0
D    2.0.0.0/8 [90/2297856] via 172.31.1.2, 00:00:59, Serial0
               [90/2297856] via 10.1.0.2, 00:00:59, Serial1
D    3.0.0.0/8 [90/409600] via 10.1.1.3, 00:45:56, Ethernet0
D    4.0.0.0/8 [90/2323456] via 10.1.1.3, 00:00:59, Ethernet0
               [90/2323456] via 172.31.1.2, 00:00:59, Serial0
               [90/2323456] via 10.1.0.2, 00:00:59, Serial1
     172.31.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.31.1.0/24 is directly connected, Serial0
D       172.31.0.0/16 is a summary, 00:01:01, Null0
     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
D       10.1.3.0/24 [90/2195456] via 10.1.1.3, 00:01:01, Ethernet0
D       10.1.2.0/24 [90/2195456] via 10.1.0.2, 00:01:01, Serial1
C       10.1.1.0/24 is directly connected, Ethernet0
D       10.0.0.0/8 is a summary, 00:41:22, Null0
C       10.1.0.0/24 is directly connected, Serial1
关闭S1后的r1
r1-2514#show ip route
Codes: C - connected, S - static, 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
       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 not set

C    1.0.0.0/8 is directly connected, Loopback0
D    2.0.0.0/8 [90/2297856] via 172.31.1.2, 00:00:10, Serial0
D    3.0.0.0/8 [90/409600] via 10.1.1.3, 00:00:10, Ethernet0
D    4.0.0.0/8 [90/2323456] via 172.31.1.2, 00:00:10, Serial0
               [90/2323456] via 10.1.1.3, 00:00:10, Ethernet0
     172.31.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.31.1.0/24 is directly connected, Serial0
D       172.31.0.0/16 is a summary, 00:00:10, Null0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
D       10.1.3.0/24 [90/2195456] via 10.1.1.3, 00:00:11, Ethernet0
D       10.1.2.0/24 [90/2221056] via 10.1.1.3, 00:00:11, Ethernet0
C       10.1.1.0/24 is directly connected, Ethernet0
D       10.0.0.0/8 is a summary, 00:00:11, Null0

 

未关闭R1-S1前R3
r3-2514#
*Mar  1 01:25:48.275: IP-EIGRP(Default-IP-Routing-Table:1): Neighbor 10.1.2.4 not on common subnet for Ethernet0
r3-2514#show ip route
Codes: C - connected, S - static, 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
       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 not set

D    1.0.0.0/8 [90/409600] via 10.1.1.1, 01:11:19, Ethernet0
D    2.0.0.0/8 [90/2323456] via 10.1.1.1, 00:42:18, Ethernet0
               [90/2323456] via 10.1.3.4, 00:42:18, Serial1
C    3.0.0.0/8 is directly connected, Loopback0
D    4.0.0.0/8 [90/2297856] via 10.1.3.4, 01:09:32, Serial1
D    172.31.0.0/16 [90/2195456] via 10.1.1.1, 00:42:19, Ethernet0
     10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C       10.1.3.0/24 is directly connected, Serial1
D       10.1.2.0/24 [90/2195456] via 10.1.3.4, 00:02:04, Serial1
C       10.1.1.0/24 is directly connected, Ethernet0
D       10.0.0.0/8 is a summary, 01:10:59, Null0
D       10.1.0.0/24 [90/2195456] via 10.1.1.1, 00:02:06, Ethernet0
关闭R1-S1后的R3
r3-2514#show ip route
Codes: C - connected, S - static, 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
       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 not set

D    1.0.0.0/8 [90/409600] via 10.1.1.1, 01:28:15, Ethernet0
D    2.0.0.0/8 [90/2323456] via 10.1.1.1, 00:59:14, Ethernet0
               [90/2323456] via 10.1.3.4, 00:59:14, Serial1
C    3.0.0.0/8 is directly connected, Loopback0
D    4.0.0.0/8 [90/2297856] via 10.1.3.4, 01:26:28, Serial1
D    172.31.0.0/16 [90/2195456] via 10.1.1.1, 00:59:14, Ethernet0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C       10.1.3.0/24 is directly connected, Serial1
D       10.1.2.0/24 [90/2195456] via 10.1.3.4, 00:19:00, Serial1
C       10.1.1.0/24 is directly connected, Ethernet0
D       10.0.0.0/8 is a summary, 01:27:54, Null0

注意上面有个汇总路由,这是自动出来的,EIGRP在汇总路由时总会产生一条指向NULL0接口的路由,这样避免在某些情况下,产生路由环路.比如有一个目标网络是汇总网络里的一个未知子网,此时如果存在默认路由指向发来数据包的路由器,那么这个时候如果没有指向NULL0的这条路由,路由器将把数据包通过默认路由发回原路由器了,产生了环路.而有了指向NULL0接口的这个路由,路由器会匹配它并丢到NULL0上,也就丢弃了数据包.
关闭前R1 到10.1.2.0是通过R2---目标
关闭后R1 到10.1.2.0是通过R3--R4---目标

关闭前R3 到10.1.2.0是通过R4---目标
关闭后R3 到10.1.2.0是通过R4---目标

最终R3无到达10.1.0.0/24的网络

关闭后R3上调试信息:
2509rj#3
[Resuming connection 3 to r3 ... ]

*Mar  1 01:12:23.507: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming QUERY packet
*Mar  1 01:12:23.511: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 0 4294967295 SM 4294967295 - 0 4294967295
*Mar  1 01:12:23.515: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.2.0/24 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295
R1路由器向R3发起了2个网络的查询,用4294967295表示我不可达这个网络,你有无去往的路径.

*Mar  1 01:12:23.531: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 4294967295 - 0 4294967295
*Mar  1 01:12:23.539: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - do advertise out Serial1 '自己无FS于是自己继续向邻居查询
*Mar  1 01:12:23.543: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 4294967295 - 0 4294967295

*Mar  1 01:12:23.555: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Mar  1 01:12:23.559: IP-EIGRP(Default-IP-Routing-Table:1): Int 2.0.0.0/8 M 2323456 - 1657856
665600 SM 2297856 - 1657856 640000
*Mar  1 01:12:23.563: IP-EIGRP(Default-IP-Routing-Table:1): Int 4.0.0.0/8 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295
*Mar  1 01:12:23.587: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.2.0/24 - do advertise out Ethernet0
*Mar  1 01:12:23.595: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.2.0/24 metric 2195456 - 1657856 537600

*Mar  1 01:12:23.603: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet
*Mar  1 01:12:23.607: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 2707456 - 1657856 1049600 SM 2195456 - 1657856 537600
*Mar  1 01:12:23.627: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet
*Mar  1 01:12:23.631: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 0 4294967295 SM 4294967295 - 0 4294967295
*Mar  1 01:12:23.639: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 routing table not updated thru 10.1.1.1
*Mar  1 01:12:23.663: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 2707456 - 1657856 1049600
*Mar  1 01:12:23.671: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - do advertise out Ethernet0
*Mar  1 01:12:23.675: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 2707456 - 1657856 1049600
*Mar  1 01:12:23.695: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Mar  1 01:12:23.699: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.2.0/24 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295
*Mar  1 01:12:23.719: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - do advertise out Ethernet0
*Mar  1 01:12:23.723: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 2707456 - 1657856 1049600
*Mar  1 01:12:23.735: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming UPDATE packet
*Mar  1 01:12:23.739: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856 4294967295
*Mar  1 01:12:25.575: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming QUERY packet
*Mar  1 01:12:25.579: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 0 4294967295 SM 4294967295 - 0 4294967295
*Mar  1 01:12:25.603: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - do advertise out Ethernet0
*Mar  1 01:12:25.607: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 4294967295 - 0 4294967295
*Mar  1 01:12:25.647: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming QUERY packet
*Mar  1 01:12:25.651: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 0 4294967295 SM 4294967295 - 0 4294967295
*Mar  1 01:12:25.679: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - do advertise out Ethernet0
*Mar  1 01:12:25.683: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 4294967295 - 0 4294967295
*Mar  1 01:12:25.735: IP-EIGRP(Default-IP-Routing-Table:1): Processing incoming REPLY packet
*Mar  1 01:12:25.739: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 M 4294967295 - 0 4294967295 SM 4294967295 - 0 4294967295
*Mar  1 01:12:25.747: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 routing table not updated thru 10.1.3.4
*Mar  1 01:12:25.775: IP-EIGRP(Default-IP-Routing-Table:1): 10.1.0.0/24 - not in IP routing table
最终路由器无法从其他路由器获得替代路径,将改条目从陆游表中删除
*Mar  1 01:12:25.779: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.1.0.0/24 metric 4294967295 - 0 4294967295r3-2514#
r3-2514#un all
至于中间有那么多次E0口上的查询等,可能是因为实验实际环境是路由器的所有E口都接在一台交换机上,而更新查询使用的是多播,每台路由器的查询它都能接到,才会导致这么条目显示.

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