Before configuration, determine the VLAN IDs, purpose, and which devices or departments will belong to each VLAN. Decide which VLANs require inter-VLAN routing and whether a super-VLAN (VLAN aggregation) is needed to reduce IP address usage and simplify Layer 3 communication .
On most switches, VLANs are created in global configuration mode. For example, on a Huawei switch:
vlan 2[Switch-vlan2] quit vlan 3[Switch-vlan3] quit
This creates VLAN 2 and VLAN 3 for different departments or segments .
interface gigabitethernet 1/0/1[Switch-GigabitEthernet1/0/1] port link-type access[Switch-GigabitEthernet1/0/1] port default vlan 2
interface gigabitethernet 1/0/5[Switch-GigabitEthernet1/0/5] port link-type trunk[Switch-GigabitEthernet1/0/5] port trunk allow-pass vlan 2 3
This allows VLAN 2 and VLAN 3 traffic to pass between aggregation and access switches .
For inter-VLAN communication, configure a VLAN interface (VLANIF) with an IP address:
interface vlanif 2[Switch-Vlanif2] ip address 10.1.1.1 255.255.255.240
If using a super-VLAN, sub-VLANs share the same subnet and communicate via proxy ARP on the VLANIF interface .
When using VLAN aggregation, enable proxy ARP on the super-VLAN to allow sub-VLANs to communicate at Layer 3 without separate subnets:
interface vlanif 4[Switch-Vlanif4] arp proxy enable
This is useful when multiple VLANs share the same IP subnet .
display vlan
display interface gigabitethernet 1/0/5 trunk
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