TIM截图20181108165303.jpg
配置R1各个端口ip
[R1]interface GigabitEthernet 0/0/0
[R1-GigabitEthernet0/0/0]ip address 192.168.100.1 24
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R1-GigabitEthernet0/0/0]qu
[R1]interface GigabitEthernet 0/0/1
[R1-GigabitEthernet0/0/1]ip address 192.168.101.2 24
[R1-GigabitEthernet0/0/1]qu
[R1]interface LoopBack 0
[R1-LoopBack0]ip address 192.168.201.1 24
[R1-LoopBack0]qu
[R1]display ip interface brief
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 4
The number of interface that is DOWN in Physical is 1
The number of interface that is UP in Protocol is 4
The number of interface that is DOWN in Protocol is 1
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.100.1/24 up up
GigabitEthernet0/0/1 192.168.101.2/24 up up
GigabitEthernet0/0/2 unassigned down down
LoopBack0 192.168.201.1/24 up up(s)
NULL0 unassigned up up(s)
配置R2各个端口ip
[R2]interface GigabitEthernet 0/0/0
[R2-GigabitEthernet0/0/0]ip address 192.168.100.2 24
[R2-GigabitEthernet0/0/0]qu
[R2]interface GigabitEthernet 0/0/2
[R2-GigabitEthernet0/0/2]ip address 192.168.102.1 24
[R2-GigabitEthernet0/0/2]qu
[R2]interface LoopBack 0
[R2-LoopBack0]ip address 192.168.202.1 24
[R2-LoopBack0]qu
[R2]display ip interface brief
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 4
The number of interface that is DOWN in Physical is 1
The number of interface that is UP in Protocol is 4
The number of interface that is DOWN in Protocol is 1
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 192.168.100.2/24 up up
GigabitEthernet0/0/1 unassigned down down
GigabitEthernet0/0/2 192.168.102.1/24 up up
LoopBack0 192.168.202.1/24 up up(s)
NULL0 unassigned up up(s)
配置R3各个端口ip
[R3]interface GigabitEthernet 0/0/1
[R3-GigabitEthernet0/0/1]ip address 192.168.101.1 24
[R3-GigabitEthernet0/0/1]qu
[R3]interface GigabitEthernet 0/0/2
[R3-GigabitEthernet0/0/2]ip address 192.168.102.2 24
[R3-GigabitEthernet0/0/2]qu
[R3]interface LoopBack 0
[R3-LoopBack0]ip address 192.168.203.1 24
[R3-LoopBack0]qu
[R3]display ip interface brief
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 4
The number of interface that is DOWN in Physical is 1
The number of interface that is UP in Protocol is 4
The number of interface that is DOWN in Protocol is 1
Interface IP Address/Mask Physical Protocol
GigabitEthernet0/0/0 unassigned down down
GigabitEthernet0/0/1 192.168.101.1/24 up up
GigabitEthernet0/0/2 192.168.102.2/24 up up
LoopBack0 192.168.203.1/24 up up(s)
NULL0 unassigned up up(s)
配置静态路由
在R1上面配置到R2 192.168.102.0/24 网段的静态路由
[R1]ip route-static 192.168.102.0 24 192.168.100.2
[R1]display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 14 Routes : 14
Destination/Mask Proto Pre Cost Flags NextHop Interface
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
192.168.100.0/24 Direct 0 0 D 192.168.100.1 GigabitEthernet
0/0/0
192.168.100.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.100.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/0
192.168.101.0/24 Direct 0 0 D 192.168.101.2 GigabitEthernet
0/0/1
192.168.101.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.101.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.102.0/24 Static 60 0 RD 192.168.100.2 GigabitEthernet
0/0/0
192.168.201.0/24 Direct 0 0 D 192.168.201.1 LoopBack0
192.168.201.1/32 Direct 0 0 D 127.0.0.1 LoopBack0
192.168.201.255/32 Direct 0 0 D 127.0.0.1 LoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
使用ping命令测试网络是畅通
[R1]ping 192.168.102.1
PING 192.168.102.1: 56 data bytes, press CTRL_C to break
Reply from 192.168.102.1: bytes=56 Sequence=1 ttl=255 time=50 ms
Reply from 192.168.102.1: bytes=56 Sequence=2 ttl=255 time=30 ms
Reply from 192.168.102.1: bytes=56 Sequence=3 ttl=255 time=30 ms
Reply from 192.168.102.1: bytes=56 Sequence=4 ttl=255 time=20 ms
Reply from 192.168.102.1: bytes=56 Sequence=5 ttl=255 time=10 ms
--- 192.168.102.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 10/28/50 ms
模拟R1与R2之间出现故障，通过备份路由R1访问R2的192.168.102.0/24网段
在R1上添加备份路由(添加后，路由表未发生变化，因为优先级为80比默认的之恋路由优先级低)
[R1]ip route-static 192.168.102.0 24 192.168.101.1 preference 80
在R2添加路由
[R2]ip route-static 192.168.101.0 24 192.168.102.2
删除R1和R2之间的连接线后路由表变化
[R1]display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 11 Routes : 11
Destination/Mask Proto Pre Cost Flags NextHop Interface
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
192.168.101.0/24 Direct 0 0 D 192.168.101.2 GigabitEthernet
0/0/1
192.168.101.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.101.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet
0/0/1
192.168.102.0/24 Static 80 0 RD 192.168.101.1 GigabitEthernet
0/0/1
192.168.201.0/24 Direct 0 0 D 192.168.201.1 LoopBack0
192.168.201.1/32 Direct 0 0 D 127.0.0.1 LoopBack0
192.168.201.255/32 Direct 0 0 D 127.0.0.1 LoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
测试R1能否达到R2的192.168.102.0/24网段
[R1]ping 192.168.102.1
PING 192.168.102.1: 56 data bytes, press CTRL_C to break
Reply from 192.168.102.1: bytes=56 Sequence=1 ttl=254 time=30 ms
Reply from 192.168.102.1: bytes=56 Sequence=2 ttl=254 time=40 ms
Reply from 192.168.102.1: bytes=56 Sequence=3 ttl=254 time=20 ms
Reply from 192.168.102.1: bytes=56 Sequence=4 ttl=254 time=20 ms
Reply from 192.168.102.1: bytes=56 Sequence=5 ttl=254 time=30 ms
--- 192.168.102.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 20/28/40 ms