Super VLAN

Network Diagram

Figure 6 Network diagram for super VLAN configuration

Network Requirements

As shown in Figure 6, Switch A works at the distribution layer to distribute traffic for the numerous hosts attached to the access switches connected to Switch A. All the hosts are assigned IP addresses from network segment 10.0.0.0/24. Switch A connects to the external network through VLAN-interface 20.

For management sake, assign these hosts to three VLANs to prevent Layer 2 communication between the hosts in different VLANs.

To save IP address resources, use VLAN-interface 10 on Switch A as the gateway to the external network for all the hosts in the three VLANs rather than assigning subnets for the VLANs separately. In addition, to enable the hosts in different VLANs to communicate at Layer 3, ARP proxy is used.

Configuration Example

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vlan 2 to 3

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vlan 5

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vlan 10

 supervlan

 subvlan 2 to 3 5

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vlan 20

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interface Vlan-interface10

 ip address 10.0.0.1 255.255.255.0

 local-proxy-arp enable      

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interface Vlan-interface20

 ip address 10.0.1.1 255.255.255.0

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interface GigabitEthernet2/0/1

 port access vlan 2

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interface GigabitEthernet2/0/2

 port access vlan 2

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interface GigabitEthernet2/0/3

 port access vlan 3

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interface GigabitEthernet2/0/4

 port access vlan 3

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interface GigabitEthernet2/0/5

 port access vlan 5

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interface GigabitEthernet2/0/6

 port access vlan 5

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interface GigabitEthernet2/0/20

 port access vlan 20