Internetworking apparatus for connecting plural network systems and communication network system composed of plural network systems mutually connected

• US 5,434,863 A
• Filed: 08/27/1992
• Issued: 07/18/1995
• Est. Priority Date: 08/30/1991
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Onishi, Katsuyoshi, Koyama, Toshiaki, Ikeda, Naoya, Takada, Osamu, Enomoto, Hiromichi
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US07/935,919
• Time in Patent Office: 1,055 Days
• Field of Search: 370/94.1, 370/94.2, 370/85.13, 370/85.9, 370/85.1, 370/85.11, 370/60
• US Class Current: 370/402
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 49/25 Routing or path finding in a switch fabric
• CPC Class Codes: H04L 49/3009 Header conversion, routing tables or routing tags
• CPC Class Codes: H04L 49/351 for local area network [LAN], e.g. Ethernet switches

Abstract

An internetworking apparatus which handles a scale of a network flexibly without degrading high speed operation. A router manager and a plurality of routing accelerator modules for performing routing are connected to one another through a high speed bus, and a plurality of communication ports are connected to the respective routing accelerators independently of one another. The plurality of routing accelerators can perform the routing for reception data packet at high speed. If more routing accelerators are provided, the disposal to the networks having a small scale to a large scale can be readily realized.

Claims

1. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said internetworking apparatus;

a plurality of routing accelerators connected to one another through a first connection bus, said routing accelerators mutually performing a forward routing of reception packet data received from one of said networks to a called network determined based on address information of the reception packet data and a routing table stored therein, through said first connection bus; and

a plurality of communication port sections, connected to said routing accelerators through a second connection bus, provided independently to every routing accelerator, said communication port sections controlling the network connected thereto to exchange packet data;

wherein said main processor is also connected to said first connection bus, and said main processor controls said routing accelerators through said first connection bus;

wherein said main processor and said routing accelerators are connected to one another through a third connection bus, and said third connection bus transmits control information including the routing table, and said first connection means transmits the packet data.

2. An internetworking apparatus according to claim 1, further comprising another information processor connected to said third connection means for carrying out a partial function of said main processor.

3. An internetworking apparatus according to claim 1, further comprising another internetworking apparatus connected to said third connection bus, wherein the forwarding of the packet data between the communication ports in said internetworking apparatus and the communication ports in said another internetworking apparatus is performed through said third connection bus.

4. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said internetworking apparatus by receiving routing information to prepare a routing table and by distributing the routing table;

a plurality of routing accelerators connected to said main processor and connected to one another through a first connection bus, said routing accelerators mutually performing a forward routing of reception packet data to a called network determined by address information of the reception packet data and the routing table stored therein, through said first connection means, said routing accelerators forwarding the routing information to said main processor through said first communication bus;

a plurality of communication port sections connected to said routing accelerators through a second connection bus provided independently to every routing accelerator, said communication port sections controlling the network connected thereto to receive packet data, said routing accelerators forwarding the routing information to said main processor through said first communication bus; and

one or more auxiliary processors, connected to said first connection bus so that said auxiliary processors are connected to said main processor and said plurality of routing accelerators, said auxiliary processors carrying out auxiliary operations not performed by said main processor.

5. An internetworking apparatus according to claim 4, wherein the auxiliary processor carries out a protocol function of said main processor.

6. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said. internetworking apparatus;

a plurality of routing accelerators connected to said main processor and connected to one another through a first connection bus, said routing accelerators mutually performing a forward routing of reception packet data received from one of said networks to a called network determined by address information of the reception packet data and a routing table stored therein, through said first connection bus;

a plurality of communication port sections connected to said routing accelerators through a second connection bus provided independently to every routing accelerator, said communication port sections controlling the networks connected thereto to exchange packet data; and

one or more auxiliary processors, connected to said plurality of routing accelerators through said fist connection bus, for carrying out auxiliary operations not performed by said main processor;

wherein the auxiliary processor includes means for processing the protocol which cannot be subjected to the forward routing by the routing accelerator, and the routing accelerator discriminates what kind of packet data the reception packet data from the communication port section is, and in the case where the reception packet data is recognized to be a kind of packet data which cannot be subjected to routing, the reception packet data is transmitted to the auxiliary processor.

7. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said internetworking apparatus;

a plurality of routing accelerators connected to said main processor and connected to one another through a first connection bus, said routing accelerators mutually performing a forward routing of reception packet data received from one of said networks to a called network determined by address information of the reception packet data and a routing table stored therein, through said first connection bus;

a plurality of communication port sections connected to said routing accelerators through a second connection bus provided independently to every routing accelerator, said communication port sections controlling the networks connected thereto to exchange packet data; and

one or more auxiliary processors, connected to said plurality of routing accelerators through said fist connection bus, for carrying out auxiliary operations not performed by said main processor;

wherein the auxiliary processor includes an interface circuit connected to another information processor or internetworking apparatus, and the routing accelerator utilizes the function of said another information processor or internetworking apparatus through the auxiliary processor.

8. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said internetworking apparatus;

a plurality of routing accelerators connected to said main processor and connected to one another through a first connection bus, said routing accelerators mutually performing a forward routing of reception packet data received from one of said networks to a called network determined by address information of the reception packet data and a routing table stored therein, through said first connection bus;

a plurality of communication port sections connected to said routing accelerators through a second connection bus provided independently to every routing accelerator, said communication port sections controlling the networks connected thereto to exchange packet data; and

one or more auxiliary processors, connected to said plurality of routing accelerators through said fist connection bus, for carrying out auxiliary operations not performed by said main processor;

wherein the auxiliary processor includes means for multiple-transmitting the data to all or a part of said plurality of routing accelerators, and each routing accelerator discriminates what kind of packet data the reception packet data from the communication port section is, and in the case where the reception packet data is recognized to be a kind of packet data which cannot be subjected to routing, the reception packet data is transmitted to the auxiliary processor, and the auxiliary processor multiple-transmits the reception packet data to other routing accelerators to perform the bridging to another network.

9. An internetworking apparatus for connecting a plurality of networks to one another to forward packet data, comprising:

a main processor including means for managing said internetworking apparatus;

a plurality of routing accelerators connected to said main processor and connected to one another through first connection bus, said routing accelerators mutually performing a forward routing of reception packet data received from one of the networks through said first connection bus to a called network determined based on address information of the reception packet data and a routing table stored in the routing accelerators, said routing table being used by said routing accelerators to perform forward routing of packet data; and

a plurality of communication port sections connected to said routing accelerators through a second connection bus provided independently to every routing accelerator, said communication port sections controlling the network connected thereto to exchange packet data;

wherein said main processor further includes means for dynamically producing said routing table required for said routing accelerators to perform the forward routing of said reception packet data, said routing table being produced by exchanging said routing table with another internetworking apparatus, and means for distributing said routing table to said plurality of routing accelerators, and

wherein said routing accelerators store said routing table.

10. An internetworking apparatus according to claim 9, wherein said main processor is also connected to said first connection means, and said main processor controls said routing accelerators through said first connection means.

11. An internetworking apparatus according to claim 9, wherein the routing accelerator includes a buffer for storing the packet data, and filtering assisting means for extracting, in parallel to the storage operation of said buffer, necessary information from the packet data to perform the filtering of the packet data under predetermined conditions.

12. An internetworking apparatus according to claim 9, wherein the routing accelerator includes a buffer for storing the packet data, and routing assisting means for extracting necessary information from reception packet data to retrieve a predetermined routing table.

13. An internetworking apparatus according to claim 9, wherein said routing accelerators each discriminates what kind of packet data the reception packet data from a communication port section is and recognizes that the reception packet data is packet data which cannot be subjected to routing when it is found as a result of the discrimination that the reception packet data is not a kind of packet data which is supported by said routing accelerator, and in the case where it is recognized that the reception packet data is a kind of packet data which cannot be subjected to routing, the reception packet data is transmitted to all of the other routing accelerators to perform bridging to another network.

14. An internetworking apparatus according to claim 13, wherein in the case where the routing accelerator recognizes the packet data which cannot be subjected to the routing, the reception packet data is also transmitted to the communication port section or sections other than the communication port section which has received the reception packet data, out of said communication port sections connected to said routing accelerators.

15. An internetworking apparatus according to claim 9, wherein the routing accelerator registers for each communication port physical station address data of a communication system connected to a communication port corresponding to each communication port section, and includes for said each communication port, filtering means for discarding the reception packet data of which address coincides with that of the station address data registered.

16. An internetworking apparatus according to claim 9, wherein said main processor further includes means for processing the protocol which cannot be subjected to the forward routing by the routing accelerator, and the routing accelerator discriminates what kind of packet data the reception packet data from the communication port section is, and in the case where the reception packet data is recognized to be a kind of packet data which cannot be subjected to routing, the packet data is transmitted to said main processor.