MANAGEMENT OF A DISTRIBUTED FABRIC SYSTEM

• US 20130235762A1
• Filed: 03/07/2012
• Published: 09/12/2013
• Est. Priority Date: 03/07/2012
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Anantharam, Sushma, Ghosh, Nirapada, Kamath, Dayavanti Gopal, Kamble, Keshav Govind, Leu, Dar-Ren, Mendon, Chandarani J., Pandey, Vijoy, Peethambaram, Nandakumar
• Granted Patent: US 9,077,651 B2
• Time in Patent Office: Days
• US Class Current: 370/255
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]
• CPC Class Codes: H04L 49/256 Routing or path finding in ATM switching fabrics
• CPC Class Codes: H04L 49/356 for storage area networks
• CPC Class Codes: H04L 49/65 Re-configuration of fast packet switches
• CPC Class Codes: H04W 36/22 for handling the traffic

Abstract

A distributed fabric system has distributed line card (DLC) chassis and scaled-out fabric coupler (SFC) chassis. Each DLC includes a network processor and fabric ports. Each network processor of each DLC includes a fabric interface in communication with the fabric ports of that DLC. Each SFC includes at least one fabric element and SFC fabric ports. A fabric communication link connects each SFC fabric port to one DLC fabric port. Each fabric communication link includes cell-carrying lanes. Each fabric element of each SFC detects connectivity between each SFC fabric port of that SFC and one DLC fabric port over a fabric communication link. Each SFC includes program code that reads connectivity matrix from fabric element chips and sends connection information corresponding to the detected connectivity from that SFC to a central agent. A network element includes the central agent, which, when executed, constructs a topology of the distributed fabric system from the connection information sent from each SFC.

Claims

1. A computer program product for managing a distributed fabric system in which a plurality of scaled-out fabric coupler (SFC) chassis is connected to a plurality of distributed line card (DLC) chassis over fabric communication links, each fabric communication link including a plurality of lanes for carrying cells, the computer program product comprising:

a computer-readable nonvolatile storage medium having computer-readable program code embodied therewith, the computer-readable program code comprising;

computer-readable program code configured to detect, by a fabric element chip of each SFC chassis, connectivity between the fabric element chip of that SFC chassis and a fabric interface of a switching chip of one of the DLC chassis;

computer-readable program code configured to send connection information corresponding to the detected connectivity from each SFC chassis to a central agent; and

computer-readable program code configured to construct a topology of the distributed fabric system from the connection information sent to the central agent by each SFC chassis.

2. The computer program product of claim 1, further comprising computer-readable program code configured to store in memory, in response to detecting connectivity, connection information for each fabric communication link between the fabric element chip of that SFC chassis and the fabric interface of a switching chip of one of the DLC chassis.

3. The computer program product of claim 1, wherein the central agent includes computer-readable program code configured to determine from the connection information, received from every SFC chassis, traffic distribution throughout the distributed fabric system and any oversubscription relationship between the plurality of SFC chassis and the plurality of DLC chassis.

4. The computer program product of claim 1, wherein the connection information is specific to each lane of each fabric communication link.

5. The computer program product of claim 1, further comprising computer-readable program code configured to transmit the topology of the distributed fabric system to a network management station and computer-readable program code configured to display the topology in graphical form at the network management station.

6. The computer program product of claim 5, further comprising computer-readable program code configured to modify the topology of the distributed fabric system through the graphical display of the topology.

7. The computer program product of claim 6, further comprising:

computer-readable program code configured to detect, by the fabric element chip of each SFC chassis, a status and bandwidth of each fabric communication link; and

computer-readable program code configured to display the status and bandwidth of each fabric communication link in the graphical display of the topology of the distributed fabric system.

8. The computer program product of claim 1, further comprising computer-readable program code configured to exchange reachability messages between the plurality of SFC chassis and the plurality of DLC chassis to detect the connectivity between the fabric element chip of each SFC chassis and the fabric interface of a switching chip of one of the DLC chassis.

9. The computer program product of claim 1, further comprising computer-readable program code configured to update the connection information corresponding to the detected connectivity at intervals of approximately six microseconds.

10. A distributed fabric system comprising:

at least one distributed line card (DLC) chassis, each DLC chassis including at least one network processor and a plurality of DLC fabric ports, each network processor of each DLC chassis including a fabric interface in communication with the DLC fabric ports of that DLC chassis; and

at least one scaled-out fabric coupler (SFC) chassis, each SFC chassis including at least one fabric element chip and a plurality of SFC fabric ports, each SFC fabric port being connected to one of the DLC fabric ports by a fabric communication link, each fabric communication link including a plurality of lanes by which to carry cells,

each fabric element chip of each SFC chassis detecting connectivity between each SFC fabric port of that SFC chassis and one of the fabric ports of the at least one DLC chassis over one of the fabric communication links, each SFC chassis further including a processor and memory storing program code configured to send connection information corresponding to the detected connectivity from that SFC chassis to a central agent; and

a network element including a processor and memory storing the central agent, the central agent includes program code configured to construct, when executed, a topology of the distributed fabric system from the connection information sent from each SFC chassis.

11. The distributed fabric system of claim 10, wherein the central agent includes computer-readable program code configured to determine from the connection information, received from every SFC chassis and DLC chassis, traffic distribution throughout the distributed fabric system and any oversubscription relationship between the plurality of SFC chassis and the plurality of DLC chassis.

12. The distributed fabric system of claim 10, wherein the connection information is specific to each lane of each fabric communication link.

13. The distributed fabric system of claim 10, wherein the network element transmits the topology of the distributed fabric system to a network management station where the topology is displayed in graphical form.

16. The distributed fabric system of claim 10, wherein the plurality of SFC chassis and the plurality of DLC chassis exchange reachability messages to detect the connectivity between the fabric element chip of each SFC chassis and the fabric interface of a switching chip of one of the DLC chassis.

17. The distributed fabric system of claim 10, further comprising wherein the connection information corresponding to the detected connectivity is updated at intervals of approximately six microseconds or less.

14. The distributed fabric system of claim 14, further comprising a user interface through which an administrator interacts with and modifies features of the graphical display of the topology in order to modify the topology of the distributed fabric system.

15. The distributed fabric system of claim 15, wherein the fabric element chip of each SFC chassis further detects a status and bandwidth of each fabric communication link, wherein the status and bandwidth of each fabric communication link is displayed in the graphical display of the topology of the distributed fabric system.

18-26. -26. (canceled)