Session-less load balancing of client traffic across servers in a server group
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United States of America Patent
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Oct 8, 2013
Grant Date -
Oct 21, 2010
app pub date -
Nov 7, 2008
filing date -
Nov 9, 2007
priority date (Note) -
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Abstract
A switch device includes a packet forwarding table for providing load balancing across servers in a server group. Each table entry maps a hash value to a server in the server group. A hash value can be computed from the destination MAC address, destination IP address, and destination service port in the header of a received packet. The packet forwarding table is searched to find an entry with a hash value that matches the computed hash value and to identify the server to which the matching hash value maps. The switch device forwards the packet to the identified server. Implementing load-balancing decisions in hardware enables packet switching at the line rate of the switch ports. In addition, the hardware-based load balancing performed by the switch device eliminates session tables and the memory to store them, enabling the switch device to handle an unlimited number of client connections.
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