High speed protocol for interconnecting modular network devices

• US 20030174719A1
• Filed: 06/17/2002
• Published: 09/18/2003
• Est. Priority Date: 03/15/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kalkunte, Mohan, Sampath, Srinivas
• Granted Patent: US 7,161,948 B2
• Time in Patent Office: Days
• US Class Current: 370/402
• CPC Class Codes: H04L 2012/445 with switching in a hub, e.g. ETHERNET switch
• CPC Class Codes: H04L 45/48 Routing tree calculation
• CPC Class Codes: H04L 49/352 Gigabit ethernet switching [GBPS]
• CPC Class Codes: H04L 49/354 for supporting virtual local area networks [VLAN]

Abstract

A network switch for network communications is disclosed. The switch includes a first data port interface, supporting at least one data port transmitting and receiving data at a first data rate and a second data port interface, supporting at least one data port transmitting and receiving data at a second data rate. A memory management unit for communicating data from at least one of the first data port interface and the second data port interface and a memory is also included. The switch uses a communication channel for communicating data and messaging information between the first data port interface, the second data port interface, and the memory management unit. The switch also has a plurality of lookup tables, including an address resolution lookup table, a VLAN table and module port table. The network switch has a unique module identifier and of the first data port interface and the second data port interface is configured to determine forwarding information from a header for an incoming data packet received at a port of the one data port interface. The port interfaces are configured to determine the forwarding information from the header and to determine a destination module identifier for a destination port for the data packet from the module port table.

Claims

1. A network switch for network communications, said network switch comprising:

a first data port interface, said first data port interface supporting at least one data port transmitting and receiving data at a first data rate;

a second data port interface, said second data port interface supporting at least one data port transmitting and receiving data at a second data rate;

a memory management unit for communicating data from at least one of said first data port interface and said second data port interface and a memory;

a communication channel, said communication channel for communicating data and messaging information between said first data port interface, said second data port interface, and said memory management unit; and

a plurality of lookup tables, said lookup tables including an address resolution lookup table, a VLAN table and module port table;

wherein said network switch has a unique module identifier, and

wherein one of said first data port interface and said second data port interface is configured to determine forwarding information from a header for an incoming data packet received at a port of said one of said first data port interface and said second data port interface, and is configured to determine the forwarding information from the header and to determine a destination module identifier for a destination port for the data packet from the module port table.

2. A network switch as recited in claim 1, wherein said one of said first data port interface and said second data port interface is configured to send the data packet over a specialized interface to a connected second network switch when the destination module identifier is different from the unique module identifier of the network switch.

3. A network switch as recited in claim 1, wherein said header contains an opcode that identifies whether the incoming data packet is a unicast packet, a multicast packet, a broadcast packet or resulted in a destination lookup failure.

4. A network switch as recited in claim 3, wherein at least one of said first data port interface and said second data port interface is configured to be a member of a trunk group and the one of said first data port interface and said second data port interface is configured to determine the destination port for the data packet based on the opcode.

5. A method of switching data in a network switch, said method comprising:

receiving an incoming data packet at a first port of a switch;

reading a first packet portion, less than a full packet length, to determine particular packet information, said particular packet information including a source address and a destination address;

obtaining a destination port and a destination module identifier from a module port table based on said particular packet information;

comparing the destination module identifier with a unique module identifier for the network switch; and

sending the incoming data packet to the destination port.

6. A method as recited in claim 5, wherein said step of sending the incoming data packet to the destination port comprising sending the data packet over a specialized interface to a connected second network switch when the destination module identifier is different from the unique module identifier of the network switch.

7. A network switch as recited in claim 5, wherein said header contains an opcode that identifies whether the incoming data packet is a unicast packet, a multicast packet, a broadcast packet or resulted in a destination lookup failure and the step of reading the first packet portion comprises reading the opcode.

8. A network switch as recited in claim 7, wherein the step of obtaining a destination port further comprises determining whether the destination port is a member of a trunk group and determining the destination port for the data packet based on the opcode.

9. A network switch comprising:

means for receiving an incoming data packet at a first port of a switch;

means for reading a first packet portion, less than a full packet length, to determine particular packet information, said particular packet information including a source address and a destination address;

means for obtaining a destination port and a destination module identifier from a module port table based on said particular packet information;

means for comparing the destination module identifier with a unique module identifier for the network switch; and

means for sending the incoming data packet to the destination port.

10. A network switch as recited in claim 9, wherein said means for sending the incoming data packet to the destination port comprising means for sending the data packet over a specialized interface to a connected second network switch when the destination module identifier is different from the unique module identifier of the network switch.

11. A network switch as recited in claim 9, wherein said header contains an opcode that identifies whether the incoming data packet is a unicast packet, a multicast packet, a broadcast packet or resulted in a destination lookup failure and the means for reading the first packet portion comprises means for reading the opcode.

12. A network switch as recited in claim 11, wherein the means for obtaining a destination port further comprises means for determining whether the destination port is a member of a trunk group and means for determining the destination port for the data packet based on the opcode.