System for registration of clients in an ATM network providing for communication of client registration messages to a central manager

• US 5,694,547 A
• Filed: 03/18/1996
• Issued: 12/02/1997
• Est. Priority Date: 10/13/1992
• Status: Expired due to Term

• Current Assignee: Rockstar Consortium US LP (Rockstar Consortium Inc.)
• Original Assignee: Bay Networks, Inc. (Nortel Networks Corporation)
• Inventors: Sawant, Shiva, Subramanian, Rajan, Chatwani, Dilip, Chiang, Winnis, Davar, Jonathan, Opher, Ayal
• Primary Examiner(s): Geckil, Mehmet B.
• Application Number:
  US08/618,472
• Time in Patent Office: 624 Days
• Field of Search: 395/200.16, 395/500, 395/800, 395/200.11, 395/200.17, 395/838, 395/839, 395/184.01, 395/183.15, 370/60
• US Class Current: 709/224
• CPC Class Codes: H04L 2012/5619 Network Node Interface, e.g. tandem connections, transit switching
• CPC Class Codes: H04L 2012/5626 Network management, e.g. Intelligent nets
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2101/604 Address structures or formats
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 41/32 Specific management aspects for broadband networks
• CPC Class Codes: H04L 41/40 using virtualisation of network functions or resources, e.g. SDN or NFV entities
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 45/10 Routing in connection-oriented networks, e.g. X.25 or ATM
• CPC Class Codes: H04L 45/42 Centralised routing
• CPC Class Codes: H04L 49/255 Control mechanisms for ATM switching fabrics
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 61/5076 Update or notification mechanisms, e.g. DynDNS
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

An asynchronous transfer mode (ATM) network or the like providing for dynamic client discovery. Clients transmit client registration messages over the virtual service paths of their associated switches to the central management supervisor. Responsive to receiving the client registration message, the central management supervisor updates its registration tables and transmits a client registration acknowledgement, again over the virtual service path. By using the virtual service path of their associated switch to effect communication with the central management supervisor, there is no need to incur overhead of having the transmission managed by the associated switch'"'"'s (and intermediate switch'"'"'s) controller. Rather, the switch merely acts to update the cell'"'"'s header using the switch'"'"'s switch fabric. Keep alive messages are exchanged, again over the virtual service path, between the central management supervisor and the client.

Claims

1. A method for registration of clients in a network of devices, each of said clients being associated with a logical address, each of said clients further being associated with a network address when connected to said network of devices, said network address indicating the associated client'"'"'s physical location within said network of devices, said network of devices including a client, a first switch having a port, and a manager, said client coupled to said port, said manager maintaining information that provides a mapping between the logical addresses of said clients and the network addresses of said clients, said method comprising the steps of:

(a) said client transmitting client registration messages to said first switch;

(b) said first switch translating said client registration messages to include information identifying said port;

(c) said first switch transmitting said client registration messages over a virtual communication path to said manager; and

(d) said manager receiving one of said client registration messages and registering said client.

2. The method as recited by claim 1 wherein said network of devices comprises an Asynchronous Transfer Mode (ATM) network.

3. The method as recited by claim 1 wherein said client registration messages are sent to said first switch over a meta-path and a meta-signaling channel.

4. The method as recited by claim 1 wherein said client is registered to said manager responsive to said manager receiving one of said client registration messages.

5. The method as recited by claim 1 wherein said manager transmits a client registration acknowledgment over said virtual communication path responsive to registering said client.

6. The method as recited by claim 5 wherein said client receives said client registration acknowledgment.

7. The method as recited by claim 1 wherein said client registration message is forwarded over said virtual communication path by said first switch without intervention by said first switch'"'"'s switch controller.

8. The method as recited by claim 1 wherein said client registration message is translated by said first switch'"'"'s switch fabric to provide for routing of said client registration message over said virtual communication path.

9. The method as recited in claim 6 wherein said client periodically transmits "keep alive" messages after receiving said client registration acknowledgment.

10. The method as recited by claim 9 wherein said client transmits a new client registration message if it does not receive a "keep alive" message from said manager during a predetermined period of time.

11. The method as recited by claim 1 further comprising the step of said manager storing said information identifying said port responsive to receiving said client registration message.

12. A system for communicating a location of a client in an Asynchronous Transfer Mode (ATM) network, said system having:

(a) a manager for registering said client with said network, said manager requiring identification information identifying said client and location information identifying the location of said client within said network in order to achieve registration of said client, said manager maintaining said identification information and said location information to provide a mapping between said identification information and said location information;

(b) said client coupled with a first port of a first switch to communicate a client registration ATM cell to said first switch;

said client registration ATM cell including a header; and

(c) said first switch coupled in communication with said manager, said first switch having a switch fabric for switching a plurality of ATM cells through said first switch and for translating headers of said ATM cells, said first switch configured to translate said header of said client registration ATM cell to include location information.

13. The system as recited by claim 12 wherein said location information includes information identifying said first switch and said first port.

14. The system as recited by claim 13 wherein said information identifying said first switch identifies a virtual service path of said first switch.

15. The system as recited by claim 13 wherein said information identifying said first switch is stored in a Virtual Path Identifier (VPI) field of said header of said client registration ATM cell.

16. The system as recited by claim 13 wherein said information identifying said first port is a port number.

17. The system as recited by claim 13 wherein said information identifying said first port is stored in a Virtual Channel Identifier (VCI) field of said header of said client registration ATM cell.

18. A method of registering clients in a network of devices, said network of devices including at least a first client, a plurality of switches, and a central management supervisor (CMS), each of said plurality of switches including one or more ports, said first switch coupled to said CMS and said network of devices, said CMS including a client address table for mapping logical addresses to physical network locations within said network of devices, said method comprising the steps of:

said first client attempting to register itself in said client address table upon being connected to a first port of a first switch of said plurality of switches, said first client being associated with a logical address and a network location, said step of attempting to register itself in said client address table including the steps of transmitting a registration message to said CMS via said first switch, and including within said registration message said logical address associated with said first client;

said first switch transmitting said first client registration message to said CMS by performing the steps of

receiving said registration message,

translating said registration message to include information indicative of said network location, and

transmitting said registration message on a previously established virtual service path (VSP) between said first switch and said CMS;

said CMS receiving said registration message; and

said CMS registering said first client in said client address table by performing the steps of

storing said logical address in said client address table, and

storing said network location in said client address table.

19. The method as recited by claim 18 wherein said plurality of switches are coupled by physical links between said plurality of switches, each of said physical links having an associated status, said method further comprising the steps of:

said network of devices performing auto-topology discovery including the steps of

said first switch of said plurality of switches establishing said VSP between said first switch and said CMS,

each switch in said plurality of switches, including said first switch, periodically transmitting on each of its ports a link advertisement message (LAM), said LAMs including topology information, and

a topology manager determining the status of the physical links between said plurality of switches based upon LAMs received by said topology manager.

20. A method for registration of clients in a network of devices, said network of devices including a first client, a first switch, and a central management supervisor (CMS), said first client coupled to said first switch, said first client associated with a first logical address and located at a first physical location within said network of devices, said first switch coupled to said CMS and said network of devices, said CMS including a client address table for mapping logical addresses to physical locations within said network of devices, said method comprising the steps of:

said first client attempting to register itself in said client address table by transmitting a first client registration message to said CMS via said first switch,

said first client registration message including said first logical address;

said first switch receiving said first client registration message;

said first switch translating said first client registration message to include information indicative of said first physical location;

said first switch transmitting said first client registration message to said CMS; and

said CMS registering said first client in said client address table.

21. The method as recited by claim 20 wherein said information indicative of said first physical location includes information identifying said first switch and a port through which said first client is connected to said first switch, and said step of said first switch translating said first client registration message to include information indicative of said first physical location further comprises the steps of:

said first switch storing said information identifying said first switch in a VPI field of said ATM cell; and

said first switch storing said information identifying said port in a VCI field of said ATM cell.