Efficient trill forwarding

1. A switch, comprising:

a storage device operable to store:

a first table comprising an entry corresponding to a media access control (MAC) address of a device and an identifier of a remote switch associated with the device, wherein the remote switch is a virtual switch comprising a number of physical switches;

a third table comprising one or more entries which map the identifier of the virtual switch to one or more identifiers of the physical switches; and

a second table comprising an entry indicating a local outgoing interface corresponding to the remote switch;

and

a lookup module operable to identify the local outgoing interface corresponding to the device based on the first table, the second table, and the third table.

2. The switch of claim 1 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

3. The switch of claim 1 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.

4. The switch of claim 1 , wherein the virtual switch is a virtual RBridge; and

wherein the identifier of the virtual switch is a virtual RBridge identifier.

5. The switch of claim 1 , further comprising an updating module operable to update the entry in the second table in response to a route change to the remote switch.

6. The switch of claim 5 , wherein the updating module, in response to the switch detecting the device to be dual-homed, is further operable to:

add the identifier of the virtual switch and the respective identifiers of the physical switches to respective entries in the third table; and

add the MAC address of the device and the identifier of the virtual switch to an entry in the first table.

7. A switch, comprising:

a storage device operable to store:

a first table comprising an entry corresponding to a media access control (MAC) address of a device and an identifier of a remote switch associated with the device; and

a second table comprising an entry indicating a local outgoing interface corresponding to the remote switch;

a lookup module operable to identify the local outgoing interface corresponding to the device based on the first table and the second table; and

a logical switch management module operable to maintain a membership in a logical switch, wherein the logical switch is operable to accommodate a plurality of switches and operates as a single switch.

8. The switch of claim 7 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

9. The switch claim 7 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.

10. A computer-executable method, comprising:

storing, by a computer, in a first table an entry comprising a media access control (MAC) address of a device and an identifier of a remote switch associated with the device, wherein the remote switch is a virtual switch comprising a number of physical switches;

storing in a third table one or more entries which map the identifier of the virtual switch to one or more identifiers of the physical switches;

storing in a second table an entry indicating a local outgoing interface of the computer corresponding to the remote switch; and

identifying the local outgoing interface corresponding to the device based on the first table, the second table, and the third table.

11. The method of claim 10 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

12. The method of claim 10 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.

13. The method of claim 10 , wherein the virtual switch is a virtual RBridge; and

wherein the identifier of the virtual switch is a virtual RBridge identifier.

14. The method of claim 10 , further comprising updating the entry in the second table in response to a route change to the remote switch.

15. The method of claim 10 , in response to detecting the device to be dual-homed, the method further comprising:

adding the identifier of the virtual switch and the respective identifiers of the physical switches to respective entries in the third table; and

adding the MAC address of the device and the identifier of the virtual switch to an entry in the first table.

16. A computer-executable method, comprising:

storing, by a computer, in a first table an entry comprising a MAC address of a device and an identifier of a remote switch associated with the device; and

storing in a second table an entry indicating a local outgoing interface corresponding to the remote switch;

identifying the local outgoing interface corresponding to the device based on the first table and the second table; and

maintaining a membership in a logical switch, wherein the logical switch is operable to accommodate a plurality of switches and operates as a single switch.

17. The method of claim 16 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

18. The method claim 16 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.

19. A computing system, comprising:

a processor; and

a non-transitory computer-readable storage medium storing instructions which when executed by the processor causes the processor to perform a method, the method comprising:

storing in a first table an entry

comprising a media access control (MAC) address of a device and an identifier of a remote switch associated with the device, wherein the remote switch is a virtual switch comprising a number of physical switches;

storing in a third table one or more entries which map the identifier of the virtual switch to one or more identifiers of the physical switches;

storing in a second table an entry indicating a local outgoing interface corresponding to the remote switch; and

identifying the local outgoing interface corresponding to the device based on the first table, the second table, and the third table.

20. The computing system of claim 19 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

21. The computing system of claim 19 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.

22. The computing system of claim 19 , wherein the virtual switch is a virtual RBridge; and

wherein the identifier of the virtual switch is a virtual RBridge identifier.

23. The computing system of claim 19 , wherein method further comprises updating the entry in the second table in response to a route change to the remote switch.

24. The computing system of claim 19 , in response to detecting the device to be dual-homed, the method further comprises:

adding the identifier of the virtual switch and the respective identifiers of the physical switches to respective entries in the third table;

adding the MAC address of the device and the identifier of the virtual switch to an entry in the first table.

25. A computing system, comprising:

a processor; and

a non-transitory computer-readable storage medium storing instructions which when executed by the processor causes the processor to perform a method, the method comprising:

storing in a first table an entry comprising a media access control (MAC) address of a device and an identifier of a remote switch associated with the device, wherein the remote switch is a virtual switch comprising a number of physical switches;

storing in a second table an entry indicating a local outgoing interface corresponding to the remote switch;

identifying the local outgoing interface corresponding to the device based on the first table and the second table; and

maintaining a membership in a logical switch, wherein the logical switch is operable to accommodate a plurality of switches and operates as a single switch.

26. The computing system of claim 25 , wherein the entry in the first table further comprises a virtual local area network (VLAN) tag associated with the device.

27. The computing system of claim 25 , wherein the identifier to the remote switch is a Transparent Interconnection of Lots of Links (TRILL) routing bridge (RBridge) identifier.