Implement access between different VLANs using vrouters

Source: Internet
Author: User


[Experiment Name]

VLAN/802.1Q-communication between VLANs


Communication between VLANs through Routers

[Experiment function]

Allows computer systems in the same VLAN to communicate with each other across routers, while computer systems in different VLANs can also communicate with each other.

[Lab device]

Routers (1), switches (1), and PCs (2) for direct connections (3)

[Experiment topology]




(Because a layer-3 switch has been configured to implement communication between different VLANs, a simple TP is used here! Configurations are the same. Here we mainly describe the configurations of the vro)

Lab procedure]


Switch> enable

Switch # configure terminal

Switch (config) # vlan 2

Switch (config-vlan) # exit

Switch (config) # vlan 3

Switch (config-vlan) # exit

Switch (config) # interface fastEthernet 0/2

Switch (config-if) # switchport access vlan 2

Switch (config-if) # exit

Switch (config) # interface fastEthernet 0/3

Switch (config-if) # switchport access vlan 3

Switch (config) # interface fastEthernet 0/24

Switch (config-if) # switchport mode trunk

(Here you will find that the second-layer switch configuration is just a few steps! Create a VLAN to divide the ports into VLANs and then set the TRUNK port)

Do you think the second layer is too pediatric! Oh, that's it! We need to despise the enemy in strategy and attach importance to the enemy in tactics #! Although it is simple, it cannot be careless!

Next, this section focuses on


Router> enable

Router # configure terminal

Router (config) # interface fastEthernet 0/0 (physical interface connected to Layer 2 TRUNK port only needs to be enabled)

Router (config-if) # no shutdown

Router (config-if) # exit

Router (config) # interface fastEthernet 0/0. 2 (subinterface for accessing the physical interface :(. 2) It can be imagined that a physical interface can have billions of sub-interfaces and sub-interfaces can be set at will)

Router (config-subif) # encapsulation dot1Q 2 (When configuring the encapsulation protocol of the sub-interface, pay attention to the second after dot1Q! In this case, the VLAN number must correspond to the switch when the VLAN number is 2)

Router (config-subif) # ip address (configure the ip address as the VLAN2 gateway)

Router (config-subif) # exit

Router (config) # interface fastEthernet 0/0. 3 (also for VLAN3)

Router (config-subif) # encapsulation dot1Q 3

Router (config-subif) # ip address

Configure IP gateway for the VLAN2 PC.

VLAN3 PC configuration IP gateway


PC> ping

Pinging with 32 bytes of data:

Reply from bytes = 32 time = 96 ms TTL = 127

Reply from bytes = 32 time = 125 ms TTL = 127

Reply from bytes = 32 time = 125 ms TTL = 127

Reply from bytes = 32 time = 125 ms TTL = 127

Ping statistics for

Packets: Sent = 4, stored ED = 4, Lost = 0 (0% loss ),

Approximate round trip times in milli-seconds:

Minimum = 96 ms, Maximum = 125 ms, Average = 117 ms

Different VLANs communicate through routers !!

This article is from "Everything is mouth-to-mouth !" Blog

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