Routing and switching technology - static routing

Static routing

One 、 Relevant concepts

1. Advantages of static routing (1). There is no need for dynamic routing protocols , Reduce the daily cost of routers ; (2). It's easy to configure on a small network ; (3). Routing can be controlled ; (4). High security , Allow network administrators to specify which of the limited network partitions can be exposed , What can be hidden .

Two 、 A simple example

1、 topology ：

2、 Set up the host IP Address

This is a PC0 Set up , The same is true for other hosts

34、 Configure the routing

  Router 1（R1）：

Router>en

Router#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#host

Router(config)#hostname R1（ Renamed as ：R1）

R1(config)#int

R1(config)#interface g0/1

R1(config-if)#iip add

R1(config-if)#ip addr

R1(config-if)#ip address 192.168.1.254 255.255.255.0

R1(config-if)#no shut

R1(config-if)#no shutdown

R1(config-if)#

%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

R1(config-if)#exit

R1(config)#int g

R1(config)#int gigabitEthernet 0/0

R1(config-if)#ip add

R1(config-if)#ip address 192.168.12.1 255.255.255.0

R1(config-if)#no s

R1(config-if)#no sh

R1(config-if)#no shutdown

R1(config-if)#

%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

R1(config-if)#exit

   Router 2（R1）：

Router>en

Router#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#host

Router(config)#hostname R2

R2(config)#int g

R2(config)#int gigabitEthernet 0/1

R2(config-if)#ip add

R2(config-if)#ip address 192.168.2.254 255.255.255.0

R2(config-if)#no shu

R2(config-if)#no shutdown

R2(config-if)#

%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up

R2(config-if)#ex

R2(config-if)#exit

R2(config)#int g

R2(config)#int gigabitEthernet 0/0

R2(config-if)#ip add

R2(config-if)#ip address 192.168.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#no shutdown

R2(config-if)#

%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up

R2(config-if)#ex

R2(config-if)#exit

4、 Configure static routing ( Simple topology )

R1(config)#ip route 192.168.2.0 255.255.255.0192.168.12.2

first ip The address is the destination network segment , The second is the mask The third is the next jump

R2(config)#ip route 192.168.1.0 255.255.255.0 192.168.12.1

This is a good match , You can use the command ：show ip route View route information

R1#show ip route（ It needs to be in privileged user mode ）

Codes: L - local, 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, E - EGP

i - IS-IS, 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

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks6

C 192.168.1.0/24 is directly connected, GigabitEthernet0/1

L 192.168.1.254/32 is directly connected, GigabitEthernet0/1

S 192.168.2.0/24 [1/0] via 192.168.12.2 （via Indicates the next hop   [1/0] 1 Indicates the management distance ,0 Indicates the number of hops ）

192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.12.0/24 is directly connected, GigabitEthernet0/0

L 192.168.12.1/32 is directly connected, GigabitEthernet0/0

5、 The verification results

ping Hosts of different network segments

Pictured pc0(192.168.1.1) ping pc2 (192.168.2.1)

It's normal to lose two bags at first

The result is ： The configuration is correct ,ping Yes ！！！