H3C Technologies H3C S5560 Series Switches - Manual (Page 179)

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Configuring super VLANs
Hosts in a VLAN typically use IP addresses in the same subnet. For Layer 3 interoperability with other
VLANs, you can create a VLAN interface for the VLAN and assign an IP address to it. This requires a
large number of IP addresses.
The super VLAN feature was introduced to save IP addresses. A super VLAN is associated with multiple
sub-VLANs. These sub-VLANs use the VLAN interface of the super VLAN (also known as a super VLAN
interface) as the gateway for Layer 3 communication.
You can create a VLAN interface for a super VLAN and assign an IP address to it. However, you cannot
create a VLAN interface for a sub-VLAN. You can assign a physical port to a sub-VLAN, but you cannot
assign a physical port to a super VLAN. Sub-VLANs are isolated at Layer 2.
You can enable Layer 3 communication between sub-VLANs by performing the following tasks:
1. Create a super VLAN and the super VLAN interface.
2. Enable local proxy ARP or ND on the super VLAN interface as follows:
{
In an IPv4 network, enable local proxy ARP on the super VLAN interface. The super VLAN can
then process ARP requests and replies sent from the sub-VLANs.
{
In an IPv6 network, enable local proxy ND on the super VLAN interface. The super VLAN can
forward and process the NS and NA messages sent from the sub-VLANs.
Super VLAN configuration task list
Tasks at a glance
(Required.) Creating a sub-VLAN
(Required.) Configuring a super VLAN
(Required.) Configuring a super VLAN interface
Creating a sub-VLAN
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a sub-VLAN. vlan vlan-id
By default, only the system default VLAN (VLAN 1)
exists.
Configuring a super VLAN
When you configure a super VLAN, follow these restrictions and guidelines: