System and method for associating VLANs with virtual switch ports

1. A network switch, comprising:

a first switch port wherein the first switch port is partitioned into a plurality virtual switch orts and each virtual switch sort belongs to one virtual local area network;

a second switch port; and

a virtual local area network module operable to:

determine from a preconfigured S-tag assigned to a virtual network interface received with a first data frame at the first switch port wherein a host device coupled to the first switch port includes the virtual network interface;

identify a virtual switch port partitioned in the first switch port that is associated with the virtual network interface; and

determine a virtual local area network associated with the identified virtual switch port from the S-tag and the virtual switch port;

remove the S-tag and assign a virtual local area network tag associated with the determined virtual local area network;

wherein the network switch is operable to route the first data frame to the virtual local area network via the second switch port.

2. The network switch of claim 1 , wherein further:

the virtual local area network module is operable to:

receive a second data frame;

determine a virtual switch port partitioned in the first switch port from a virtual local area network tag and a destination address on the second data frame received at the second port; and

determine an S-tag assigned to a virtual network interface at a destination host device coupled to the first switch port.

3. The network switch of claim 2 , wherein the network switch is operable to route the second data frame to the destination device via the first switch port.

4. The network switch of claim 1 , wherein further:

each virtual switch port is associated with one virtual network interface at the host device coupled to the first switch port.

5. The network switch of claim 1 , wherein the virtual local area network is configured at the network switch to include the host device and not at the host device coupled to the first switch port.

6. The network switch of claim 1 , wherein the virtual local area network is configured at the network switch to include the virtual switch port.

7. The network switch of claim 1 , wherein the virtual local area network module is further operable to establish a physical trunk port between the network switch and the virtual network interface at the device coupled to the first switch port.

8. A method of communicating with a virtual local area network, comprising:

receiving a first data frame at a virtual network interface of a physical network interface from an application operating on an information handling system, wherein the physical network interface of the information handling system is partitioned into a plurality of virtual network interfaces and may communicate with a plurality of virtual local area networks;

adding an S-tag preconfigured and assigned to the virtual network interface to the first data frame; and

sending the first data frame to a network switch via the virtual network interface;

wherein the S-tag will indicate to the network switch, along with an identified virtual switch port of the network switch receiving the first data frame, the virtual network interface for association of the data frame with a virtual local area network, and

wherein the virtual network interface communicates with the virtual local area network as if untagged with a VLAN tag.

9. The method of claim 8 , further comprising:

receiving a second data frame with an assigned S-tag at the corresponding virtual network interface from the network switch;

removing the S-tag from the second data frame; and

sending the second data frame without the S-tag to the application on the information handling system.

10. The method of claim 8 , wherein:

the first data frame is an Ethernet packet data frame.

11. The method of claim 8 , wherein the virtual network interface of the information handling system has an S-tag assigned upon initiating an S-tag mode.

12. A method of providing access to a virtual local area network, comprising:

receiving a first data frame containing an S-tag at a network switch, wherein the S-tag is preconfigured and assigned to a virtual network interface of a sending device coupled to the network switch;

determining a virtual switch port of the network switch based on the S-tag;

determining the virtual local area network associated with the virtual switch port;

receiving the first data frame containing an S-tag at the virtual switch port, wherein the virtual switch port is associated with one virtual network interface at the sending device connected to the network switch;

removing the S-tag from the first data frame and adding a virtual local area network tag to update the first data frame; and

sending the updated first data frame to a destination address on a network link to the virtual local area network.

13. The method of claim 12 , further comprising:

receiving a second data frame with a virtual local area network tag and a destination address at the network switch;

determining a preconfigured S-tag associated with the virtual local area network tag from the second data frame;

removing the virtual local area network tag from the second data frame and attaching the S-tag associated with the virtual local area network tag to update the second data frame; and

sending the updated second data frame to the destination address with the virtual network interface assigned that S-tag via a virtual switch port on the network switch.

14. The method of claim 12 , wherein determining the virtual local area network associated with the S-tag comprises:

determining a virtual switch port identifier from the S-tag and from a physical port identifier of the physical port on which the first data frame is received; and

determining membership of a virtual switch port identified by the virtual switch port identifier in the virtual local area network.

15. The method of claim 12 , wherein the virtual local area network associated with the S-tag comprises:

the virtual local area network having a member virtual switch port; and

the member virtual switch port is configured to the virtual local area network at a virtual local area network module in the network switch.

16. The method of claim 13 , wherein determining the S-tag associated with the virtual local area network tag from the second data frame comprises:

determining a virtual switch port identifier from the destination address and the virtual local area network tag; and

determining the S-tag from the virtual switch port identifier.