Systems and methods for a VLAN switching and routing service

1. A method comprising:

generating a table for an instance of a VLAN switching and routing service (VSRS), the VSRS coupling a first virtual layer 2 network with a second network, wherein the table contains information identifying IP addresses, MAC addresses, and virtual interface identifiers for instances within the first virtual layer 2 network, and wherein the table contains mapping information for IP addresses outside of the first virtual layer 2 network;

receiving with the VSRS a packet from a first instance designated for delivery to a second instance, wherein the second instance is outside of the first virtual layer 2 network;

identifying with the VSRS the second instance for delivery of the packet based on information received with the packet and information contained within the table; and

delivering the packet to the identified second instance.

2. The method of claim 1 , wherein the first virtual layer 2 network comprises a plurality of instances.

3. The method of claim 2 , wherein the first virtual layer 2 network comprises a plurality of layer 2 virtual network interface cards (L2 VNICs), and a plurality of switches, wherein each of the plurality of instances is communicatively coupled with a pair comprising a unique layer 2 virtual network interface card (L2 VNIC) and a unique switch.

4. The method of claim 3 , wherein identifying with the VSRS the second instance for delivery of the packet based on information received with the packet and information contained within the table comprises:

determining a destination IP address of the packet; and

looking up mapping for the packet in the table.

5. The method of claim 3 , wherein the packet received with the VSRS from the first instance comprises an encapsulated packet including address information.

6. The method of claim 5 , wherein the address information includes first address information identifying an address of the VSRS, and second address information identifying a destination IP address, wherein the destination IP address is the IP address of the second instance.

7. The method of claim 6 , wherein identifying with the VSRS the second instance for delivery of the packet based on information received with the packet and information contained within the table comprises:

decapsulating the packet;

accessing the second address information; and

looking up mapping for the packet in the table.

8. The method of claim 7 , wherein delivering the packet to the identified second instance comprises:

stripping the packet of the first address information; and

re-encapsulating the packet.

9. The method of claim 8 , wherein the packet is re-encapsulated with an layer 3 encapsulation.

10. The method of claim 9 , wherein the re-encapsulated packet includes the IP address of the first instance and the destination IP address.

11. The method of claim 10 , wherein the second instance is inside of the second network.

12. The method of claim 11 , wherein the second instance is inside of a second virtual layer 2 network within the second network.

13. The method of claim 12 , wherein delivering the packet to the identified second instance comprises sending the re-encapsulated packet to a destination VSRS associated with the second virtual layer 2 network.

14. The method of claim 13 , wherein the destination VSRS is configured to:

receive the re-encapsulated packet;

remove the layer 3 encapsulation; and

forward the packet to the second instance.

15. The method of claim 11 , wherein the second instance is within a layer 3 subnet inside of the second network.

16. The method of claim 15 , wherein delivering the packet to the identified second instance comprises sending the re-encapsulated packet to a virtual router associated with the layer 3 subnet.

17. The method of claim 11 , wherein the second instance is outside of the second network.

18. The method of claim 17 , wherein delivering the packet to the identified second instance comprises sending the re-encapsulated packet to a gateway communicatively coupled to the second instance.

19. A system comprising:

a physical network comprising:

at least one processor; and

a network virtualization device,

wherein the at least one processor is configured to:

instantiate an instance of a VLAN switching and routing service (VSRS), the VSRS coupling a first virtual layer 2 network with a second network;

generate a table for the instance of the VSRS, wherein the table contains information identifying IP addresses, MAC addresses, and virtual interface identifiers for instances within the first virtual layer 2 network;

receive with the VSRS a packet from a first instance designated for delivery to a second instance, wherein the second instance is outside of the first virtual layer 2 network;

identify with the VSRS the second instance for delivery of the packet based on information received with the packet and information contained within the table; and

deliver the packet to the identified second instance.

20. A non-transitory computer-readable storage medium storing a plurality of instructions executable by one or more processors, the plurality of instructions when executed by the one or more processors cause the one or more processors to:

instantiate an instance of a VLAN switching and routing service (VSRS), the VSRS coupling a first virtual layer 2 network with a second network;

generate a table for the instance of the VSRS, wherein the table contains information identifying IP addresses, MAC addresses, and virtual interface identifiers for instances within the first virtual layer 2 network;

receive with the VSRS a packet from a first instance designated for delivery to a second instance, wherein the second instance is within the first virtual layer 2 network;

identify with the VSRS the second instance for delivery of the packet based on information received with the packet and information contained within the table; and

deliver the packet to the identified second instance.