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Network switch having system for automatically detecting change in network node connection
| Details |
Inventors: Chiang, John; Merchant, Shashank; Williams, Robert;
Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA)
Primary Examiner: Ton; Dang
Assistant Examiner: Mehra; Inder Pal
Attorney, Agent or Firm:
A novel system and method of automatically detecting a change in network node connection in a multiport data switching system having receive ports for receiving data packets from network nodes, and a decision making engine for controlling data forwarding. Data blocks representing received data packets are placed in data queues corresponding to the receive ports. The data queues are transferred to logic circuitry for processing in accordance with a predetermined algorithm. This processing includes automatically detecting a change in connection between at least one of the network nodes and at least one of the receive ports, based on a search of an address table having address information relating to the receive ports. The address table may be searched for an address entry having a source address and VLAN address information that match a source address and VLAN address information of the received data packet. Receive port data written in the address entry having matching address information are checked to determine whether these data identify a receive port arranged in the same trunk as the receive port, from which the data packet is transferred. The address entry is automatically updated with new information, if the receive port identified in the address entry and the actual receive port are in different trunks. |
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DETAILED DESCRIPTION What is claimed is: 1.
A multiport data communication system for transferring data packets between ports, the data communication system comprising: a plurality of receive ports for receiving data packets from a plurality of network nodes, a decision making engine responsive to the received data packets for controlling transmission of the received data packets, the decision making engine including: a plurality of queuing devices corresponding to the plurality of receive ports for creating queues of data blocks representing the data packets received by the corresponding receive ports, an address table storage for storing an address table having address information relating to the plurality of the receive ports and logic circuitry responsive to the plurality of queuing devices for processing the data blocks in accordance with a prescribed algorithm to identify destination for each data packet, said logic circuitry including a detecting circuit for automatically detecting disconnection of at least one of the plurality of network nodes from at least one of the plurality of receive ports and connection of the at least one of the plurality of network nodes to another receive port of the plurality of receive ports, based on a search of the address table.
2.
The system of claim 1, wherein the detecting circuit is configured to search the address table for an address entry having address information that matches corresponding address information of a data packet.
3.
The system of claim 2, wherein the detecting circuit is configured to determine whether receive port data written in the address entry correspond to a receive port, from which the data packet is transferred.
4.
The system of claim 3, wherein the detecting circuit is configured to automatically update the address entry with new information, if the receive port data written in the address entry do not correspond to the receive port.
5.
The system of claim 2, wherein the detecting circuit is configured to determine whether receive port data written in the address entry identify a receive port arranged in the same trunk as a receive port, from which the data packet is transferred
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