| US 7,581,009 B1 | ||
| Global server load balancing | ||
| Ivy Pei-Shan Hsu, Pleasanton, Calif. (US); David Chun-Ying Cheung, Cupertino, Calif. (US); and Rajkumar Ramniranjan Jalan, Saratoga, Calif. (US) | ||
| Assigned to Foundry Networks, Inc., Santa Clara, Calif. (US) | ||
| Filed on Apr. 27, 2007, as Appl. No. 11/741,480. | ||
| Application 11/741480 is a continuation of application No. 09/670487, filed on Sep. 26, 2000, granted, now 7,454,500, filed on Nov. 18, 2008. | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 15/173 (2006.01) | ||
| U.S. Cl. 709—226 | 28 Claims |
| 1. A method of performing load balancing using a load balancing switch, the method comprising:
storing, at the load balancing switch, performance metrics regarding a plurality of site switches, each site switch associated
with one or more host servers, wherein the one or more host servers associated with a site switch are reachable via the site
switch using a virtual address configured at the site switch and wherein the performance metrics regarding a site switch comprise
one or more metrics related to one or more host servers associated with the site switch;
storing, at the load balancing switch, a plurality of network addresses generated in response to a domain name query;
ordering the plurality of network addresses at the load balancing switch based upon a first set of performance metrics from
the stored performance metrics to generate a first ordered list of network addresses;
determining if a single network address tops the first ordered list generated based upon the first set of performance metrics;
and
upon determining that a single network address does not top the first ordered list, reordering, at the load balancing switch,
one or more network addresses from the plurality of network addresses based upon a second set of performance metrics from
the stored performance metrics, wherein the second set of performance metrics is different from the first set of performance
metrics.
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