Ethernet wide area networks and methods

• US 8,149,853 B2
• Filed: 10/23/2009
• Issued: 04/03/2012
• Est. Priority Date: 05/08/2002
• Status: Expired due to Term

• Current Assignee: SBC Technology Resources, Inc. (AT&T, Inc.)
• Original Assignee: AT&T Labs Incorporated (AT&T, Inc.)
• Inventors: Chang, Frederick Robert, Soon, Shih Chung
• Primary Examiner(s): Phan, M.
• Application Number:
  US12/605,117
• Publication Number:
  US 20100103944A1
• Time in Patent Office: 893 Days
• Field of Search: 370219-401, 709223-245
• US Class Current: 370/401
• CPC Class Codes: H04L 12/4616 LAN interconnection over a LAN backbone

Abstract

Ethernet wide area networks and methods are disclosed. A disclosed example Ethernet wide area network includes a first network Ethernet switch having a first network interface and a first service interface. The first service interface is to communicate with a first local area Ethernet switch. The network also includes a second network Ethernet switch having a second network interface and a second service interface. The second service interface is to communicate with the second local area Ethernet switch. The network also includes a root node network Ethernet switch having a third network interface to communicate with the first network interface with the first network Ethernet switch and a fourth network interface to communicate with the second network interface of the second network Ethernet switch. The first, second, third and fourth network interfaces are to route packets from the first local area Ethernet switch to the second local area Ethernet switch without recognizing subscriber LAN MAC addresses associated with either the first or second local area Ethernet switches.

Claims

1. For use with a first local area network having a first local area Ethernet switch and a second local area network having a second local area Ethernet switch, an Ethernet wide area network, comprising:

a first network Ethernet switch having a first network interface and a first service interface, the first service interface to communicate with the first local area Ethernet switch;

a second network Ethernet switch having a second network interface and a second service interface, the second service interface to communicate with the second local area Ethernet switch; and

a root node network Ethernet switch having a third network interface to communicate with the first network interface of the first network Ethernet switch and a fourth network interface to communicate with the second network interface of the second network Ethernet switch, the first, second, third and fourth network interfaces to route packets from the first local area Ethernet switch to the second local area Ethernet switch without recognizing subscriber local area network medium access control addresses associated with either the first or second local area Ethernet switches.

2. The Ethernet wide area network of claim 1, wherein a first set of the subscriber local area network medium access control addresses are recognized at the first service interface and a second set of the subscriber local area network medium access control addresses are recognized at the second service interface.

3. The Ethernet wide area network of claim 1, wherein a translation table associated with the root node network Ethernet switch does not include any of the subscriber local area network medium access control addresses.

4. The Ethernet wide area network of claim 1, wherein the first service interface includes a translation table to translate a first one of the subscriber local area network medium access control addresses associated with a packet received from the first local area Ethernet switch to an ingress medium access control address associated with the first network Ethernet switch.

5. The Ethernet wide area network of claim 4, further comprising replacing a second one of the subscriber local area network medium access control addresses associated with the received packet with an egress medium access control address associated with the second network Ethernet switch.

6. The Ethernet wide area network of claim 5, further comprising translating the egress medium access control address to a destination medium access control address associated with the second local area Ethernet switch.

7. The Ethernet wide area network of claim 1, wherein the root node network Ethernet switch further comprises control software to adjust a transmission delay based on a maximum bridge diameter.

8. The Ethernet wide area network of claim 7, wherein the control software is to discover the maximum bridge diameter.

9. For use with a first local area network having a first local area Ethernet switch and a second local area network having a second local area Ethernet switch, an Ethernet wide area network, comprising:

a first network Ethernet switch having a first network interface and a first service interface, the first service interface to communicate with the first local area Ethernet switch;

a second network Ethernet switch having a second network interface and a second service interface, the second service interface to communicate with the second local area Ethernet switch; and

a root node network Ethernet switch having a third network interface to communicate with the first network interface of the first network Ethernet switch and a fourth network interface to communicate with the second network interface of the second network Ethernet switch, a spanning tree associated with the first network Ethernet switch, the second network Ethernet switch and the root node network Ethernet switch including medium access control addresses for the first, second, third and fourth service interfaces, but not including medium access control addresses of either of the first or second local area Ethernet switches.

10. The Ethernet wide area network of claim 9, wherein a first set of the medium access control addresses of the first and second local area Ethernet switches are recognized at the first service interface and a second set of the medium access control addresses of the first and second local area Ethernet switches are recognized at the second service interface.

11. The Ethernet wide area network of claim 9, wherein a translation table associated with the root node network Ethernet switch does not include any of the medium access control addresses of the first and second local area Ethernet switches.

12. The Ethernet wide area network of claim 9, wherein the first service interface includes a translation table to translate a first one of the medium access control addresses of the first and second local area Ethernet switches associated with a packet received from the first local area Ethernet switch to an ingress medium access control address associated with the first network Ethernet switch.

13. The Ethernet wide area network of claim 12, further comprising replacing a second one of the medium access control addresses of the first and second local area Ethernet switches associated with the received packet with an egress medium access control address associated with the second network Ethernet switch.

14. The Ethernet wide area network of claim 13, further comprising translating the egress medium access control address to a destination medium access control address associated with the second local area Ethernet switch.

15. The Ethernet wide area network of claim 9, wherein the root node network Ethernet switch further comprises control software to adjust a transmission delay based on a maximum bridge diameter.

16. The Ethernet wide area network of claim 15, wherein the control software is to discover the maximum bridge diameter.

17. An Ethernet network, comprising:

a first local Ethernet network having a first plurality of hubs;

a second local area Ethernet network having a second plurality of hubs; and

a wide area Ethernet network communicatively coupling the first and second local area Ethernet networks, the wide area Ethernet network having a third plurality of hubs, a sum of the first, second and third plurality of hubs exceeding seven, wherein the first, second and third plurality of hubs send topology updates via broadcast protocol data unit packets.

18. The Ethernet network of claim 17, wherein a spanning tree associated with the wide area Ethernet network does not include medium access control addresses of either of the first or second local area Ethernet networks.