还是OSPF在帧中继环境下的问题

皮皮波丘

很简单的一个拓扑，听完耿叔的视频自己敲的时候发现的

路由表挺全的，可是R2ping不通R3，为什么啊？

路由表里有路由，为什么呢？

R1#
R1#sh ip rou
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

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.10.254.2, 00:01:00, Serial0/1
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 10.10.254.3, 00:01:00, Serial0/1
     10.0.0.0/24 is subnetted, 1 subnets
C       10.10.254.0 is directly connected, Serial0/1


R2#
R2#sh ip rou
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

     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/65] via 10.10.254.1, 00:00:22, Serial0/2
     2.0.0.0/24 is subnetted, 1 subnets
C       2.2.2.0 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 10.10.254.3, 00:00:22, Serial0/2
     10.0.0.0/24 is subnetted, 1 subnets
C       10.10.254.0 is directly connected, Serial0/2
R2#ping 3.3.3.3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
....
Success rate is 0 percent (0/4)
R2#ping 1.1.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!


R3#
R3#sh ip rou
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

     1.0.0.0/32 is subnetted, 1 subnets
O       1.1.1.1 [110/65] via 10.10.254.1, 00:02:02, Serial0/3
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.10.254.2, 00:02:02, Serial0/3
     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Loopback0
     10.0.0.0/24 is subnetted, 1 subnets
C       10.10.254.0 is directly connected, Serial0/3
R3#ping 1.1.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/49/88 ms
R3#ping 2.2.2.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R3#

tea

1、R2与R3之间都有对方的路由，这意味着什么？
2、R2与R3之间都有对方的路由，说明三层构造IP报文的信息有了，那么二层的信息呢？路由的下一跳是谁？有关于它的二层信息么？

小皮球

tea 发表于 2013-10-17 09:25
1、R2与R3之间都有对方的路由，这意味着什么？
2、R2与R3之间都有对方的路由，说明三层构造IP报文的信息有 ...

叔，你回答速度太快了，我刚上论坛发现那么多问题，你居然已经在回答了。

Jeff.

目测没有到达R3帧中继接口的MAP映射，这个映射类似于二层信息，在数据包封装的时候需要使用，而且是双向的。

方便的话把每台设备的show frame map洒出来瞅瞅就知道了。

thx your post

小皮球

小皮球 发表于 2013-10-17 09:34
叔，你回答速度太快了，我刚上论坛发现那么多问题，你居然已经在回答了。

{:soso_e112:}

皮皮波丘

tea 发表于 2013-10-17 09:25
1、R2与R3之间都有对方的路由，这意味着什么？
2、R2与R3之间都有对方的路由，说明三层构造IP报文的信息有 ...

谢谢朱sir，原来我昨晚为了一座空中楼阁忙活了一夜啊！

一语点醒，Thank you very much!{:soso_e110:}