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Spanning tree recovery in machine networks

  • US 6,940,825 B2
  • Filed: 09/04/2003
  • Issued: 09/06/2005
  • Est. Priority Date: 08/27/1998
  • Status: Expired due to Fees
First Claim
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1. A network switch comprising:

  • two or more ports; and

    a machine-readable medium embodying information indicative of instructions that when performed by the network switch result in operations comprising;

    storing a value representing a determined distance to a network core for the network switch, wherein the network core represents a high bandwidth portion of a network and comprises multiple core switches having a distance to network core of zero;

    configuring one of the two or more ports as a root port, in a forwarding state, that represents a least cost path to a root switch and another of the two or more ports in a blocking state, the root switch having been selected for a spanning tree for the network to center the spanning tree at the network core, the spanning tree being formed in part by said configuring; and

    recovering the spanning tree, in response to a communication failure, based on periodically propagated network core distance information stored in the network switch.

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