Routing between VLANs (explanation + verification)

Catalog

One 、 Analysis of underlying principles ：

Two 、 experiment

  (1) Network topology ： 

（2） Main idea ： 

（3） Analysis of the underlying principle of the experiment

（3） Main configuration commands ：

notes ：

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One 、 Analysis of underlying principles ：

Related to knowledge ：  arp agreement 、arp The reason for the response 、arp Response process 、 Immunity ARP Answer the attached drawings in detail （ It is recommended to watch on the computer ）_ Isolated city 286 The blog of -CSDN Blog _arp Respond to

(39 Bar message ) vlan Routing between + Single arm routing （ Explanation of experimental ideas + To configure ）_ Isolated city 286 The blog of -CSDN Blog _ Configure single arm router vlan Routing between

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Two 、 experiment

Simulator ：Cisco Packet Tracer 

(1) Network topology ： 

（2） Main idea ： 

• ① Configure two stations PC And a server ＩＰ And gateway  
• ② Create the same... On three switches VLAN, Interconnected link encapsulation trunk link
• ③ The corresponding interfaces are marked into the corresponding VLAN, On the core switch （vlan Inside ） To configure ip Address ,  As VLAN      Inner terminal （PC And the server ） Gateway for
• ④ The core switch turns on the routing function

（3） Analysis of the underlying principle of the experiment

（3） Main configuration commands ：

• ——1.   The configuration of the three switches is the same vlan

     sw2(config)#vlan 10   --------- establish vlan 10
     sw2(config-vlan)#name pc1  --------- by vlan name

• ——2. The corresponding interface of the switch vlan in ：

    sw2(config)#interface f0/1 ---------- Enter into f0/1 Interface
    sw2(config-if)#switchport mode access  ------- Change the interface to access mode
    sw2(config-if)#switchport accesss vlan 10 ------ Draw the interface into vlan 10
    sw2(config-if)#no shutdown----------- Open the interface
    sw2#show vlan brief ------- Check whether the interface is delimited into vlan The situation of

• ——3. Encapsulation between switches trunk link

    Access switch ：
 sw2(config)#interface f0/1 ---------- Enter into f0/1 Interface
 sw2(config-if)#switchport mode trunk ------- Encapsulate the interface trunk

  Core switch   Interface encapsulation trunk You need to connect the interface first trunk type    Change it to dot1q Type, that is to say 802.1q
sw1(config)#interface range f0/2 , f0/3
sw1(config-if-range)#switchport trunk encapsulation dot1q 
sw1(config-if-range)#switchport mode trunk 
sw1#show interfaces trunk------- see trunk The state of the link

• —— The core switch is configured with a gateway ：

sw1(config)#interface vlan 10
sw1(config-if)#ip add 192.168.10.1 255.255.255.0

sw1(config-if)#no sh
sw1(config)#ip routing ----------- Turn on the routing function （ Three layer switch , You need to turn on the route forwarding function ）

notes ：

• see ARP surface ：arp -a
• see MAC Address table ：show mac address-table
• View routing table ：show ip route