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Server load balancing using IP option field approach to identify route to selected server

  • US 7,088,718 B1
  • Filed: 03/19/2002
  • Issued: 08/08/2006
  • Est. Priority Date: 03/19/2002
  • Status: Active Grant
First Claim
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1. A method of routing data from a client through one or more load-balancing nodes to a selected load-balanced server among a plurality of servers in a network, the method comprising the steps of:

  • receiving, at a last load balancing node associated with a selected server among the plurality of servers, a first packet of a server reply to a request from the client;

    setting a first flag value in the first packet of the server reply;

    storing one or more identifiers of ingress interfaces on which the packet arrives, in a send path list for server load balancing, as the first packet of the server reply is routed from the last load balancing node to the client using hop-by-hop decisions;

    receiving one or more subsequent packets of the client request;

    setting a second flag value in each of the subsequent packets; and

    forwarding the subsequent packets to the selected server only on a route that is defined by the send path list and without hop-by-hop routing decisions.

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