14 SUPER VLANn Only the 96Gbps switch fabrics support the super VLAN.Super VLAN Overview To save IP address resources, the super VLAN concept (also known as VLANaggregation) was developed. Its principle is like this: a super VLAN may includemultiple sub VLANs, with each as a broadcast domain. Layer 2 isolation isimplemented between sub VLANs. The super VLAN can be configured with a Layer3 interface, but not the sub VLAN.When users in different sub VLANs want Layer 3 communication, they use the IPaddress of the Layer 3 interface of the super VLAN as their gateway address. IPaddress resources are saved since multiple sub VLANs share one IP address.At the same time, in order to realize the Layer 3 connectivity between the subVLANs and between the sub VLAN and other networks, ARP proxy function isused. ARP proxy enables Layer 3 connectivity between Layer 2 isolated ports byperforming ARP request and forwarding and handling response packets.Super VLANConfigurationSuper VLANConfiguration TasksConfiguring a SuperVLANYou can configure multiple super VLANs for a switch. You can use the followingcommands to specify a VLAN as a super VLAN. After a VLAN is configured as asuper VLAN, the configuration of corresponding VLAN interfaces and IP addressesis the same as the configuration for an ordinary VLAN.Table 68 Super VLAN configuration tasksOperation Description Related sectionConfigure a super VLAN Optional “Configuring a Super VLAN”on page 121Configure a sub VLAN Optional “Configuring a Sub VLAN” onpage 122Configure the mappingbetween super VLAN and subVLANOptional “Configuring the Mappingbetween a Super VLAN and aSub VLAN” on page 122Configure super VLAN tosupport DHCP relayOptional “Configuring Super VLAN toSupport DHCP Relay” on page123
