3Com Switch 8800 Advanced Software V5 Configuration Guide

15
SUPER VLAN CONFIGURATION
When configuring super VLAN, go to these sections for information you are
interested in:
■ “Introduction to Super VLAN” on page 167
■ “Configuring Super VLAN” on page 167
■ “Displaying Super VLAN” on page 168
■ “Super VLAN Configuration Example” on page 168
Introduction to Super
VLAN
With the development of networks, network address resource has become more
and more scarce. The concept of Super VLAN was introduced to save the IP
address space. Super VLAN is also named as VLAN aggregation. A super VLAN
involves multiple sub-VLANs and has a VLAN interface with an IP address.
Sub-VLANs are configured with no VLAN interfaces and isolated from each other
on Layer 2. If Layer 3 communication is needed from a sub-VLAN, it uses the IP
address of the VLAN interface of the super VLAN as the gateway IP address. Thus,
multiple sub-VLANs share the same gateway address and therefore saving the IP
address resource.
The local proxy Address Resolution Protocol (ARP) function is used to realize Layer
3 communications between sub-VLANs and between sub-VLANs and other
networks. It works as follows: after creating the super VLAN and the VLAN
interface, enable the local proxy ARP function on the VLAN interface, so that the
super VLAN can forward ARP responses and requests to realize the Layer 3
communication between sub-VLANs.
n
For introduction on proxy ARP, refer to “Proxy ARP Configuration” on page 201.
Configuring Super
VLAN
Follow the following steps to configure super VLAN:
To do... Use the command... Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure the VLAN as a
super VLAN
supervlan Required
Correlate the super VLAN
with its sub-VLAN(s)
subvlan vlan-list Required
The specified sub-VLANs must
have existed.
Return to system view quit -