Multiple VLAN architecture system

• US 6,035,105 A
• Filed: 01/02/1996
• Issued: 03/07/2000
• Est. Priority Date: 01/02/1996
• Status: Expired due to Term

• Current Assignee: Cisco Systems, Inc.
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Young, Christopher, McCloghrie, Keith, Finn, Norman W., James, Bernard R.
• Primary Examiner(s): Pan, Daniel H.
• Application Number:
  US08/582,074
• Time in Patent Office: 1,526 Days
• Field of Search: 395/200.33, 395/200.75, 395/200.77, 395/200.61, 395/200.57, 395/200.66, 395/200.69, 395/200.68, 370/392, 370/402, 370/407, 370/396, 370/428, 370/406, 370/401, 364/DIG. 1, 364/DIG. 2
• US Class Current: 709/236
• CPC Class Codes: H04L 12/4645 Details on frame tagging routing of packets H04L45/00; support for virtual LAN H04L49/354
• CPC Class Codes: H04L 12/4666 Operational details on the addition or the stripping of a tag in a frame, e.g. at a provider edge node
• CPC Class Codes: H04L 12/4679 Arrangements for the registration or de-registration of VLAN attribute values, e.g. VLAN identifiers, port VLAN membership

Abstract

A system in which a single VLAN architecture spans multiple VLAN transport protocols and technologies, including a method and system in which multiple different VLANs may be combined in a single enterprise network. Each LAN-switch in the sytem identifies each frame with an identifier, and associates that identifier with particular VLAN identifiers for each type of VLAN technology. When a frame is bridged or routed from a first type of VLAN to a second type of VLAN, the first VLAN encapsulation is removed and the second VLAN encapsulation is added, with appropriate change in the VLAN identifier for the frame or packet. The identifier may also be implicit for the frame, such as when a particular set of sender'"'"'s MAC addresses are identified with a particular VLAN. Individual VLANs, of whatever architecture, may be added, configured or reconfigured, modified, or deleted, using control tools associated with the multiple VLAN architecture system. Individual ports may be associated with particular VLANs, or may be designated "dynamic" so that frames or packets associated with those ports are associated with particular VLANs in response to source or destination addresses or other information.

Claims

1. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

wherein said LAN-switch comprises a plurality of dynamic ports, each said dynamic port being associated with a first one of said VLANs and comprising means for being reassociated with a second one of said VLANs.

2. The system in claim 1, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

3. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

wherein said LAN-switch comprises at least one trunk port for which packets are received for one of a plurality of VLANs, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a MAC address.

4. The system in claim 3, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

5. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

wherein said LAN-switch comprises at least one trunk port for which packets are received for one of a plurality of VLANs, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a source address.

6. The system in claim 5, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

7. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

wherein said LAN-switch comprises at least one trunk port for which packets are received for one of a plurality of VLANs, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to an administrative policy.

8. The system in claim 7, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

9. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

wherein said LAN-switch comprises at least one trunk port for which packets are received for one of a plurality of VLANs, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a parameter for a layer three protocol.

10. The system in claim 9, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

11. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

means in each LAN-switch for transmitting multicast advertising packets on each trunk port for said LAN-switch.

12. The system in claim 11, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

13. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation;

means in each LAN-switch for transmitting multicast advertising packets on each trunk port for said LAN-switch;

means in each LAN-switch for receiving said multicast advertising packets; and

means in each LAN-switch for defining parameters for a plurality of VLANs, responsive to said multicast advertising packets.

14. The system in claim 13, further comprising means for identifying said VLAN identifier and means for determining a new VLAN identifier for said second VLAN responsive thereto.

15. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

a plurality of network communication media;

a first VLAN comprising a first plurality of devices, each one of said first plurality of devices coupled to at least one of said network communication media;

a second VLAN comprising a second plurality of devices, each one of said second plurality of devices coupled to at least one of said network communication media;

said first plurality and said second plurality sharing at least one common device;

means for detecting a first VLAN identifier for said first VLAN;

means for associating said first VLAN identifier with a second VLAN identifier for said second VLAN; and

means for inserting said second VLAN identifier into said re-encapsulated packet.

16. A system as in claim 15, comprising means for defining a new VLAN comprising a new corresponding plurality of devices, each one of said new corresponding plurality of devices coupled to at least one of said network communication media.

17. A system as in claim 15, comprising means for deleting one of said plurality of VLANs.

18. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

a plurality of network communication media;

a first VLAN comprising a first plurality of devices, each one of said first plurality of devices coupled to at least one of said network communication media;

a second VLAN comprising a second plurality of devices, each one of said second plurality of devices coupled to at least one of said network communication media;

said first plurality and said second plurality sharing at least one common device;

means for suspending one of said plurality of VLANs; and

means for removing a suspension for a suspended one of said plurality of VLANs.

19. A multiple VLAN architecture system, in which multiple different VLANs are operational within a single network, comprising:

at least one network communication medium;

a LAN-switch coupled to said at least one network communication medium and disposed to receive and route packets, each said packet having a VLAN identifier, and comprising means for routing from a first VLAN to a second VLAN, said means for routing comprising means for removing a first VLAN encapsulation and means for adding a second VLAN encapsulation; and

wherein said LAN-switch comprises a plurality of ports including at least one trunk port for which packets are received for one of a plurality of VLANs.

20. The apparatus of claim 19, wherein said plurality of ports include at least one dynamic port which is associated with a first one of said VLANs and includes means for being reassociated with a second one of said VLANs.

21. The apparatus of claim 19, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a MAC address.

22. The apparatus of claim 19, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a source address.

23. The apparatus of claim 19, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to an administrative policy.

24. The apparatus of claim 19, wherein packets received on said at least one trunk port are assigned to a particular VLAN responsive to a parameter for a layer three protocol.

25. The apparatus of claim 19, further comprising means in each LAN-switch for transmitting multicast advertising packets on each trunk port for said LAN-switch.

26. The apparatus of claim 19, further comprising:

means in each LAN-switch for transmitting multicast advertising packets on each trunk port for said LAN-switch;

means in each LAN-switch for receiving said multicast advertising packets; and

means in each LAN-switch for defining parameters for a plurality of VLANs, responsive to said multicast advertising packets.