VLAN switch for aggregation

To add a VLAN to an aggregation switch, create the VLAN, configure it as a sub-VLAN if using super-VLAN aggregation, and assign it to the appropriate aggregated interface or trunk.Step 1: Create the VLANOn most switches, you first need to create the VLAN and optionally assign a description:Huawei example:CodeCopysystem-viewvlan 20description "Sub-VLAN for Sales Department" Cisco example:CodeCopyenableconfigure terminalvlan 20name Sales_VLANexit Step 2: Configure VLAN Aggregation (Super-VLAN) if NeededIf your network uses VLAN aggregation to reduce IP address usage, you can assign the VLAN as a sub-VLAN under a super-VLAN:Huawei example:CodeCopyvlan 2aggregate-vlan 2access-vlan 20 30 This adds sub-VLANs 20 and 30 to super-VLAN 2. Ensure that any VLANIF interfaces on the sub-VLANs are removed before running access-vlan to avoid conflicts .Step 3: Assign VLAN to Aggregated Interface (Link Aggregation / LAG)If the VLAN needs to traverse a link aggregation group (LAG) or trunk:Huawei example:CodeCopyinterface Bridge-Aggregation 1port link-type trunkport trunk allow-pass vlan 20 Cisco example:CodeCopyinterface Port-channel1switchport mode trunkswitchport trunk allowed vlan 20 This ensures that traffic from VLAN 20 can pass through the aggregated ports .Step 4: Verify ConfigurationCheck VLAN membership:CodeCopydisplay vlan 20show vlan brief Check aggregation interface:CodeCopydisplay interface Bridge-Aggregation 1show etherchannel summary Ensure the VLAN is active and passing traffic correctly across the aggregation group.Step 5: Optional Layer 3 ConfigurationIf the VLAN requires routing between VLANs:Create a VLANIF interface on the super-VLAN or directly on the VLAN:CodeCopyinterface Vlanif 20ip address 192.168.20.1 255.255.255.0 This allows hosts in VLAN 20 to communicate with other VLANs using the same gateway if using super-VLAN aggregation .Key ConsiderationsA VLAN can only belong to one super-VLAN.Remove any existing VLANIF interfaces on sub-VLANs before aggregation.Ensure the aggregated interface is configured as a trunk to carry multiple VLANs.Use dynamic aggregation if supported to simplify LAG management and avoid port state mismatches .Following these steps ensures that the new VLAN is properly added to the aggregation switch, participates in the super-VLAN if used, and can communicate across the network through the aggregated links.