SYSTEM AND METHOD FOR ISOLATING NETWORK CLIENTS

• US 20100142526A1
• Filed: 02/08/2010
• Published: 06/10/2010
• Est. Priority Date: 06/27/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Wong, David
• Granted Patent: US 8,059,648 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 45/245 Link aggregation, e.g. trunking
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A network device includes at least one first network port, at least one second network port, a MUX unit and a switching unit. The MUX unit is connected to the at least one first network port. The MUX unit includes a trunk circuit and an output. The trunk circuit is configured to aggregate data packets received at the at least one first port into a trunk group and to output trunked data packets to the output. The switching unit is connected to the output of the MUX unit and to the at least one second network port. The switching unit is configured to switch the trunked data packets to the at least one second network port.

Claims

1. An apparatus, comprising:

at least one first network port;

at least one second network port;

a trunk circuit connected to the first network port, the trunk circuit being configured to aggregate data packets received at the first network port into a trunk group and to output trunked data packets to an output and being configured to isolate each of the network ports from each other; and

a switching unit connected to the output of the trunk circuit and to the second network port, the switching unit being configured to switch the trunked data packets to the second network port.

2. The apparatus of claim 1 wherein the first network port comprises at least one downstream network port and the second network port comprises at least one upstream network port.

3. The apparatus of claim 1 wherein the switching unit is further connected to the first network port, wherein data packets received from the output of the trunk circuit or from the second network port are switched to the first network port.

4. The apparatus of claim 1 wherein the trunk circuit is configured to eliminate point-to-point protocol (PPP) communications between the first network port and the second network port.

5. The apparatus of claim 1 wherein the trunk circuit comprises a multiplexer.

6. The apparatus of claim 1 wherein the trunk circuit comprises a memory buffer, the memory buffer being configured to store data packets from the first network port.

7. The apparatus of claim 1 wherein the switching unit further comprises a media access controller (MAC) and an address resolution logic unit (ARL) configured to switch data packets.

8. An apparatus, comprising:

multiple network ports;

a trunk circuit connected to a first network port of the multiple network ports, the trunk circuit being configured to aggregate data packets received at the first network port into a trunk group and to output trunked data packets to an output, wherein the trunk circuit comprises an isolation circuit that is configured to isolate at least the first network port from a second network port of the network ports; and

a switching unit connected to the output and to the second network port of the multiple network ports, the switching unit being configured to switch the trunked data packets to the second network port.

9. The apparatus of claim 8 wherein the isolation circuit is configured to isolate each of the network ports from one another.

10. The apparatus of claim 8 wherein the first network port comprises at least one downstream network port and the second network port comprises at least one upstream network port.

11. The apparatus of claim 8 wherein the switching unit is further connected to the first network port, wherein data packets received from the output of the trunk circuit or from the second network port are switched to the first network port.

12. The apparatus of claim 8 wherein the trunk circuit is configured to eliminate point-to-point protocol (PPP) communications between the first network port and the second network port.

13. The apparatus of claim 8 wherein the trunk circuit comprises a multiplexer.

14. The apparatus of claim 8 wherein the trunk circuit comprises a memory buffer, the memory buffer being configured to store data packets from the first network port.

15. The apparatus of claim 8 wherein the switching unit further comprises a media access controller (MAC) and an address resolution logic unit (ARL) configured to switch data packets.

16. A method, comprising:

providing multiple network ports including a first network port and a second network port;

isolating at least the first network port from the second network port;

receiving input data packets at the first network port;

trunking the input data packets received at the first network port;

inputting results of the trunking into a switching unit; and

switching the results of the trunking to the second network port.

17. The method as in claim 16 wherein the isolating comprises isolating each of the network ports from each other.

18. The method as in claim 16 wherein trunking the input data packets eliminates point-to-point protocol (PPP) communications between the first network port and the second network port.

19. The method as in claim 16 further comprising providing a separate circuit for switching the results of the trunking to the second network port.

20. The method as in claim 16 further comprising connecting the first network port and the second network port in a ring topology.