CANONICAL NAME (CNAME) HANDLING FOR GLOBAL SERVER LOAD BALANCING
First Claim
1. A method of providing load balancing in a network, the method comprising:
- checking, by a load balance switch, a domain name system (DNS) reply for an alias associated with a canonical name (CNAME) record; and
if the alias associated with the CNAME record is detected in said DNS reply by said checking, applying by said load balance switch a load balancing algorithm to a list of network addresses provided in the DNS reply.
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Accused Products
Abstract
Canonical name (CNAME) handling is performed in a system configured for global server load balancing (GSLB), which orders IP addresses into a list based on a set of performance metrics. When the GSLB switch receives a reply from an authoritative DNS server, the GSLB switch scans the reply for CNAME records. If a CNAME record is detected and it points to a host name configured for GSLB, then a GSLB algorithm is applied to the reply. This involves identifying the host name (pointed to by the CNAME record) in the reply and applying the metrics to the list of returned IP addresses corresponding to that host name, to reorder the list to place the “best” IP address at the top. If the CNAME record in the reply points to a host name that is not configured for GSLB, then the GSLB sends the reply unaltered to the inquiring client.
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Citations
14 Claims
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1. A method of providing load balancing in a network, the method comprising:
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checking, by a load balance switch, a domain name system (DNS) reply for an alias associated with a canonical name (CNAME) record; and if the alias associated with the CNAME record is detected in said DNS reply by said checking, applying by said load balance switch a load balancing algorithm to a list of network addresses provided in the DNS reply. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. An article of manufacture, comprising:
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a storage medium having instructions stored thereon that are executable by a load balance switch to; check, by said load balance switch, a domain name system (DNS) reply for an alias associated with a canonical name (CNAME) record; and if the alias associated with the CNAME record is detected in said DNS reply by said check, apply by said load balance switch a load balancing algorithm to a list of network addresses provided in the DNS reply. - View Dependent Claims (8, 9, 14)
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10. An apparatus to provide load balancing in a network, the apparatus comprising:
a load balance switch including; a parser to check a domain name system (DNS) reply for an alias associated with a canonical name (CNAME) record; and a controller coupled to the parser, the controller being operative to, if the alias associated with the CNAME record is detected in said DNS reply by the parser, apply a load balancing algorithm to a list of network addresses provided in the DNS reply. - View Dependent Claims (11, 12)
Specification