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State transition protocol for high availability units

  • US 6,678,835 B1
  • Filed: 06/12/2000
  • Issued: 01/13/2004
  • Est. Priority Date: 06/10/1999
  • Status: Expired due to Term
First Claim
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1. A high-availability system comprising:

  • a first edge device managing policies of a first network;

    a second edge device managing policies of a second network; and

    a central policy server in communication with the first and second edge devices, the central policy server managing the first and second edge devices from a single location;

    wherein, the central policy server and the first and second edge devices include first class units and second class units, each second class unit providing backup for a corresponding first class unit upon failure of the first class unit.

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