Configuring basic settings of a VLAN interface
For hosts of different VLANs to communicate at Layer 3, you can use VLAN interfaces. VLAN interfaces are virtual interfaces used for Layer 3 communication between different VLANs. They do not exist as physical entities on devices. For each VLAN, you can create one VLAN interface and assign an IP address to it. The VLAN interface acts as the gateway of the VLAN to forward packets destined for another IP subnet.
When you configure a VLAN interface, follow these restrictions and guidelines:
Before you create a VLAN interface for a VLAN, create the VLAN first.
You cannot create a VLAN interface for a sub-VLAN. For more information about sub-VLANs, see "Configuring super VLANs."
You cannot create VLAN interfaces for secondary VLANs that have the following characteristics:
Associated with the same primary VLAN.
Enabled with Layer 3 communication in VLAN interface view of the primary VLAN interface.
For more information about secondary VLANs, see "Configuring the private VLAN."
To configure basic settings of a VLAN interface:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Create a VLAN interface and enter VLAN interface view. | interface vlan-interface vlan-interface-id | If the VLAN interface already exists, you enter its view directly. By default, no VLAN interface is created. |
3. Assign an IP address to the VLAN interface. | ip address ip-address { mask | mask-length } [ sub ] | By default, no IP address is assigned to any VLAN interface. |
4. Configure the description of the VLAN interface. | description text | The default setting is the VLAN interface name. For example, Vlan-interface1 Interface. |
5. (Optional.) Specify a member device for forwarding the traffic on the current VLAN interface. | service slot slot-number | By default, no member devices are specified. |
6. Configure the MTU for the VLAN interface. | mtu size | The default setting is 1500 bytes. |
7. Configure the expected bandwidth of the interface. | bandwidth bandwidth-value | By default, the expected bandwidth (in kbps) is the interface baud rate divided by 1000. |
8. (Optional.) Restore the default settings for the VLAN interface. | default | N/A |
9. (Optional.) Bring up the VLAN interface. | undo shutdown | By default, a VLAN interface is not manually shut down. The VLAN interface is up if one or more ports in the VLAN is up, and goes down if all ports in the VLAN go down. |