Global server load balancing
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United States of America Patent
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Sep 20, 2011
Grant Date -
Apr 1, 2010
app pub date -
Feb 16, 2007
filing date -
Sep 26, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A global server load-balancing (GSLB) switch serves as a proxy to an authoritative DNS and communicates with numerous site switches that are coupled to host servers serving specific applications. The GSLB switch receives from site switches operational information regarding host servers within the site switches neighborhood. When a client program requests a resolution of a host name, the GSLB switch, acting as a proxy of an authoritative DNS, returns one or more ordered IP addresses for the host name. The IP addresses are ordered using metrics that include the information collected from the site switches. In one instance, the GSLB switch places the address that is deemed “best” at the top of the list.
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