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Backup service managers for providing reliable network services in a distributed environment

  • US 6,687,222 B1
  • Filed: 07/02/1999
  • Issued: 02/03/2004
  • Est. Priority Date: 07/02/1999
  • Status: Expired due to Term
First Claim
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1. A fault tolerant method of providing a network service including:

  • receiving a first criteria specifying a first set of flows from a first service manager at a forwarding agent;

    storing the first criteria on the forwarding agent;

    receiving a second criteria specifying a second set of flows from a second service manager at the forwarding agent wherein the second set of flows includes flows that are in the first set of flows and wherein the second criteria is designated as a lower priority criteria;

    storing the second criteria on the forwarding agent;

    receiving a packet belonging to a flow that is included in the first set and the second set;

    determining that the packet matches the first set; and

    forwarding the packet to the first service managers, wherein the second service manager is operable to function as a primary service manager or a backup service manager.

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