Single arm routing configuration

Single arm routing usage scenario ：

By default , Different vlan Users are not allowed to access each other , But in some special cases , It is necessary to realize the interaction between different users , At this point, we need to use single arm routing technology ; The principle is to connect a physical interface , Divided into multiple virtual sub interfaces , Each virtual sub interface can be configured with an address as a gateway .

simulation PC Unit network

Experimental equipment ： A switch , A router , Two hosts , Build a simple topology

1. Configure switches , Divide vlan, take F0/1 The port belongs to vlan10,F0/2 Belong to vlan20

// Switch settings access mouth , And divide subnets

Switch(config)#interface f0/1        // Get into f0/1 port

Switch(config-if)#switchport mode access  // Set the port to access Pattern

Switch(config-if)#switchport access vlan 10  // take f0/1 Port is allocated to vlan10

Switch(config-if)#do show vlan b  // See if the configuration is successful

You can see , Switchboard F0/1 Ports are divided into vlan 10,F0/2 Ports are divided into vlan 20

2. To configure PC0 and PC1 Of IP, Attention gateway

3. Configure router , Configure the network port ,

Open the interface of the router

Router(config)#interface f0/0  

Router(config-if)#no shutdown

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Single arm routing configuration ：

1. Open the interface of the router    

        Router(config)#interface f0/0

        Router(config-if)#no shutdown

2. Create a virtual sub interface

Router(config-if)#int f0/0.10     // Get into f0/0 Virtual sub interface of

Router(config-subif)#encapsulation dot1Q 10  // Encapsulate and mark the virtual sub interface vlan10 The label of

Router(config-subif)#ip add  192.168.10.254 255.255.255.0  // To configure IP Address

Router(config-subif)#int f0/0.20

Router(config-subif)#encapsulation dot1Q 20

Router(config-subif)#ip add 192.168.20.254 255.255.255.0

3. Set the port between the switch and the router to TRUNK Pattern .

Switch(config)#int f0/3

Switch(config-if)#switchport mode trunk

4. Configuration is complete , test PC1 And PC2 Is your communication successful

Reference link ：

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