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Configuring super VLANs
Super VLAN, also called "VLAN aggregation," was introduced to save IP address space. 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. Sub VLANs are isolated
at Layer 2.
You can create a VLAN interface for a super VLAN and assign an IP address to the VLAN interface.
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.
You can enable Layer 3 communication between sub VLANs by performing the following tasks:
1.
Create a super VLAN and the 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 forward and process ARP requests and replies.
{
In an IPv6 network, enable local proxy ND on the super VLAN interface. The super VLAN can
then forward and process the NS and NA messages.
Super VLAN configuration task list
Tasks at a glance
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:
•
Do not configure a VLAN as a super VLAN and a sub VLAN at the same time.
•
You can configure Layer 2 multicast for a super VLAN. However, the configuration does not take
effect.
To configure a super VLAN: