High-performance network switch

• US 6,697,368 B2
• Filed: 05/15/2001
• Issued: 02/24/2004
• Est. Priority Date: 11/17/2000
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Foundry Networks Incorporated (Broadcom, Inc.)
• Inventors: Chang, Andrew, Patel, Ronak, Wong, Ming G
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US09/855,031
• Publication Number:
  US 20020089972A1
• Time in Patent Office: 1,015 Days
• Field of Search: 370/229, 370/230, 370/244, 370/352, 370/359, 370/395.1, 370/395.7, 370/395.71, 370/395.72, 370/398, 370/412, 370/413, 370/414, 370/419, 370/476, 370/474, 370/471, 370/466, 370/389
• US Class Current: 370/395.1
• CPC Class Codes: H04L 47/50 Queue scheduling
• CPC Class Codes: H04L 47/6225 Fixed service order, e.g. Round Robin
• CPC Class Codes: H04L 49/101 using crossbar or matrix
• CPC Class Codes: H04L 49/153 ATM switching fabrics having parallel switch planes
• CPC Class Codes: H04L 49/1538 Cell slicing
• CPC Class Codes: H04L 49/1546 using pipelined operation
• CPC Class Codes: H04L 49/254 Centralised controller, i.e. arbitration or scheduling
• CPC Class Codes: H04L 49/30 Peripheral units, e.g. input or output ports
• CPC Class Codes: H04L 49/352 Gigabit ethernet switching [GBPS]
• CPC Class Codes: H04L 49/40 Constructional details, e.g. power supply, mechanical construction or backplane
• CPC Class Codes: H04L 49/90 Buffering arrangements
• CPC Class Codes: H04L 49/901 using storage descriptor, e.g. read or write pointers

Abstract

The present invention provides a high-performance network switch. A digital switch has a plurality of blades coupled to a switching fabric via serial pipes. Serial link technology is used in the switching fabric. Each blade outputs serial data streams with in-band control information in multiple stripes to the switching fabric. The switching fabric includes a plurality of cross points corresponding to the multiple stripes. In one embodiment five stripes and five cross points are used. Each blade has a backplane interface adapter (BIA). One or more integrated bus translators (IBTs) and/or source packet processors are coupled to a BIA. An encoding scheme for packets of data carried in wide striped cells is provided.

Claims

1. A digital switch comprising:

a switching fabric; and

a plurality of blades coupled to said switching fabric via serial pipes;

wherein each blade outputs serial data streams with in-band control information in multiple stripes to said switching fabric,

wherein said switching fabric includes a plurality of cross points corresponding to the multiple stripes,

wherein said multiple stripes comprise five stripes, and said serial data streams with in-band control information comprises five serial data streams of wide striped cells carrying packets of data, the wide striped cells including the in-band control information,

wherein said plurality of cross points comprises five cross points, and each blade has five serial links coupled to respective ones of said five cross points.

2. The digital switch of claim 1, wherein the switching fabric determines a destination blade for data in the data streams using the in-band control information.

3. The digital switch of claim 1, wherein the wide striped cells include start-of-cell in-band control information in each of the five stripes.

4. The digital switch of claim 1, wherein the serial data streams output by each blade represent an aggregation of input serial data streams provided through physical ports to a respective blade.

5. The digital switch of claim 1, wherein each wide striped cell is encoded to provide in-band control information for each stripe.

6. A digital switch comprising:

a switching fabric that switches data flow across multiple stripes;

sets of serial links, each set having serial links corresponding to respective stripes of the multiple stripes; and

a plurality of blades coupled to said switching fabric through said sets of serial links;

wherein each blade generates wide striped cells having blocks that extend across the multiple stripes, each block having subblocks associated with respective stripes of the multiple stripes,

wherein each blade outputs the subblocks across a respective set of serial links to said switching fabric such that subblocks are sent on serial links associated with corresponding stripes,

wherein each wide striped cell is encoded to provide in-band control information for each stripe,

wherein the subblocks include control and state information relating to traffic flow conditions in the stripes.

7. The digital switch of claim 6, wherein the multiple stripes comprise five stripes, and said switching fabric includes five cross points corresponding to the five stripes.

8. The digital switch of claim 6, wherein each set of serial links comprises five serial links coupling a respective blade with a corresponding cross point.

9. The digital switch of claim 6, wherein each serial link carries duplex traffic and has a capacity of at least approximately 10 gigabits per second.

10. The digital switch of claim 6, wherein said plurality of blades comprises eight blades, and said switching fabric has a switching capacity of at least approximately 800 gigabits per second.

11. The digital switch of claim 6, wherein the switching fabric determines a destination blade for data using the in-band control information.

12. The digital switch of claim 6, wherein the wide striped cells include start-of-cell in-band control information in each stripe.

13. A digital switch comprising:

a switching fabric that switches data flow across multiple stripes;

sets of serial links, each set having serial links corresponding to respective stripes of the multiple stripes; and

a plurality of blades coupled to said switching fabric through said sets of serial links;

wherein each blade generates wide striped cells having blocks that extend across the multiple stripes, each block having subblocks associated with respective stripes of the multiple stripes, and

wherein each blade outputs the subblocks across a respective set of serial links to said switching fabric such that subblocks are sent on serial links associated with corresponding stripes, wherein the multiple stripes comprise five stripes, and said switching fabric includes five cross points corresponding to the five stripes.

14. The digital switch of claim 13, wherein each set of serial links comprises five serial links coupling a respective blade with each of said five cross points.

15. The digital switch of claim 14, wherein each serial link carries duplex traffic and has a capacity of at least approximately 10 gigabits per second.

16. The digital switch of claim 15, said plurality of blades comprises eight blades, and said switching fabric has a switching capacity of at least approximately 800 gigabits per second.

17. The digital switch of claim 13, wherein each wide striped cell is encoded to provide in-band control information for each stripe.

18. The digital switch of claim 13, wherein the subblocks include control and state information relating to traffic flow conditions in the multiple stripes.

19. A digital switch comprising:

a switching fabric; and

a plurality of blades coupled to said switching fabric via serial pipes;

wherein each blade outputs serial data streams with in-band control information in multiple stripes to said switching fabric,

wherein said switching fabric includes a plurality of cross points corresponding to the multiple stripes,

wherein said serial data streams with in-band control information comprise serial data streams of wide striped cells carrying packets of data, the wide striped cells including the in-band control information, and

wherein said plurality of cross points comprises at least one cross point for each stripe, and each blade has at least one serial link for each stripe coupled to a respective cross point.

20. The digital claim 19, wherein the switching fabric determines a destination blade for data in the data streams using the in-band control information.

21. The digital switch of claim 19, wherein the wide striped cells include start-of-cell in-band control information in each of the stripes.

22. The digital switch of claim 19, wherein the switching fabric determines a destination blade for data in the serial data streams using the in-band control information.

23. The digital switch of claim 19, wherein the serial data streams output by each blade represent an aggregation of input serial data streams provided through physical ports to a respective blade.

24. The digital switch of claim 19, wherein each wide striped cell is encoded to provide in-band control information for each stripe.

25. The digital switch of claim 19, wherein the multiple stripes comprise five stripes.

26. The digital switch of claim 19, wherein each set of serial links comprises five serial links coupling a respective blade with each cross point.

27. The digital switch of claim 19, wherein each serial link carries duplex traffic and has a capacity of at least approximately 10 gigabits per second.

28. The digital switch of claim 19, wherein said plurality of blades comprises eight blades, and said switching fabric has a switching capacity of at least approximately 800 gigabits per second.