网络工程 - 无论配置如何，两台路由器之间的光纤连接始终处于关闭状态 - 吾爱随笔录

我在 packettracer 上对以下网络进行了建模。Router4和之间的光纤连接已断开Router8且无法连接。无论我做什么，连接仍然关闭。模型的源文件在这里上传。我想知道是否有人知道为什么连接断开。

我在这里添加了路由器的运行配置。Router4的运行配置：

Router#show running-config 
Building configuration...

Current configuration : 1009 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
ip dhcp excluded-address 192.168.16.1
!
ip dhcp pool POOL
 network 192.168.16.0 255.255.255.0
 default-router 192.168.16.1
 dns-server 172.16.100.2
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
 ip address 192.168.16.1 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet1/0
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial2/0
 no ip address
 clock rate 2000000
 shutdown
!
interface Serial3/0
 no ip address
 clock rate 2000000
 shutdown
!
interface FastEthernet4/0
 ip address 192.168.0.2 255.255.255.0
!
interface FastEthernet5/0
 ip address 10.0.4.1 255.255.255.0
!
router rip
 version 2
 network 10.0.0.0
 network 192.168.0.0
 network 192.168.16.0
 no auto-summary
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

Router 8的运行配置：

Router#show running-config 
Building configuration...

Current configuration : 1057 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
ip dhcp excluded-address 192.168.137.1
!
ip dhcp pool POOL1
 network 192.168.137.0 255.255.255.0
 default-router 192.168.137.1
 dns-server 172.16.100.2
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
 ip address 192.168.137.1 255.255.255.0
 duplex auto
 speed auto
!
interface FastEthernet1/0
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial2/0
 no ip address
 clock rate 2000000
 shutdown
!
interface Serial3/0
 no ip address
 clock rate 2000000
 shutdown
!
interface FastEthernet4/0
 ip address 10.0.1.2 255.255.255.0
!
interface FastEthernet5/0
 ip address 10.0.2.1 255.255.255.0
!
interface GigabitEthernet8/0
 ip address 10.0.4.2 255.255.255.0
!
router rip
 version 2
 network 10.0.0.0
 network 192.168.137.0
 no auto-summary
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end