Packet switch with load surge-control and methods thereof

Details Packet switch with load surge-control and methods thereof Packet switch with load surge-control and methods thereof

2006-10-03

2006-10-03

Lim, Krisna (Department: 2153)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

C370S351000

Reexamination Certificate

active

07117269

ABSTRACT:
A content-aware application switch and methods thereof intelligently switch client packets to one server among a group of servers in a server farm. The switch uses Layer7or application content parsed from a packet to help select the server and to schedule the transmitting of the packet to the server. This enables refined load-balancing and Quality-of-Service control tailored to the application being switched. In another aspect of the invention, a slow-start server selection method assigned an initially boosted server load metric to a server newly added to the group of servers under load balancing. This alleviates the problem of the new server being swamped initially due to a very low load metric compared to that of others. In yet another aspect of the invention, a switching method dependent on Layer7content avoids delayed binding in a new TCP session. Layer7content is not available during the initial handshaking phase of a new TCP session. The method uses the Layer7content from a previous session as an estimate to help select the server and uses a default priority to scheduling the transmitting of the handshaking packets. Updated Layer7content available after the handshaking phase is then used to reset the priority for the transmit schedule and becomes available for use in load balancing of the next TCP session.

REFERENCES:
patent: 6580715 (2003-06-01), Bare
patent: 6772211 (2004-08-01), Lu et al.
patent: 6856991 (2005-02-01), Srivastava
patent: 6944678 (2005-09-01), Lu et al.

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