Category: Labs
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Lab aims

To make students acquainted with operating of QinQ technology frequently used in service provider networks or local networks of large companies. The network is built with the help of GNS3 emulator.

Network scheme

Lab description

The lab emulates a network of a provider who has points of presence in two cities: Moscow and St. Petersburg. The operator provides clients with L2-connectivity but does not restrict them to the only virtual network, it means that the provider gets 802.1Q trunk from clients. The operator also provides routing between virtual networks of the same client.

Studying of QinQ settings for real switches is out of scope of this lab, so ordinary emulator’s switches (Ethernet switch) are appropriate as L2 devices. Cisco 7200 model with the version of the operating system (IOS) recommended by the tutor is used as a router.

SW1, SW5, PC1, PC2, PC5 and PC6 devices belong to A company. The company B has the following devices: SW2, SW6, PC3, PC4, PC7 and PC8. The network operator has R1 router and two switches (SW3 and SW4).

The table below presents mapping between clients’ computers, numbers of virtual networks and PCs’ IP addresses.

PC VLAN IP-address
PC1 2
PC2 3
PC3 2
PC4 3
PC5 2
PC6 3
PC7 2
PC8 3


As the numbers of clients’ virtual networks overlap, there is no ability to transmit them via an ordinary trunk between cities.

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