Cisco Technology, Inc.

Anh Tien Nguyen

Anurag Kahol

Rina Panigrahy

Sumandra Majee

Patrick Darrell Tate

Martin Grimm

Alexander S Waterman

William Nelson

David James Leroy

Wesley Chou

A method of managing servers in a server cluster is disclosed. The health of servers is detected through passive return traffic monitoring. Server failure can be detected through TCP information or HTTP return codes. Various settings affecting number of failure thresholds and the time period to detect failures can be configured. Servers can be mapped to URLs such that passive health monitoring can be performed for URLs instead of server clusters.

Method and system for managing servers in a server cluster

Network connection switchover is accomplished through a method comprising receiving information defining a first connection between a first network device and a computer; establishing a replication channel between the first network device and a backup device; storing backup control information at the backup device; communicating a message flow between the first network device and the computer on the first transport connection; in response to unavailability of the first network device, communicating messages on the replication channel that cause (a) establishing a second connection between the backup device and the computer; (b) continuing communication of the message flow between the backup device and the computer based on the backup control information. TCP connections, for example, can be switched from an active device to a backup device without reset or re-transmission.

Method and apparatus for replicating a transport layer protocol stream

Methods and apparatus are disclosed for regular expression matching, especially for, but not limited to high-speed applications such as in a packet switching system (e.g., a router). One implementation includes a matching mechanism for processing each character of a plurality of input characters to progressively generate keyword indications of matched keywords as matched keywords are identified, and for generating one or more matching indications of matched base expressions and non-keyword expressions. These indications are received by a matched regular expression detection mechanism which generates one or more matched regular expression indications based on said one or more keyword indications and said one or more matching indications. In one implementation, the matched regular expression detection mechanism maintains a keyword data structure, which is updated as matched keyword indications are received to ensure they are matched in a proper order. One implementation uses a bitmap to track the matched keywords and AND-SHIFT-OR operations to efficiently update the bitmap.

Methods and apparatus for regular expression matching

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Cupertino, CA, United States of America

Anh Tien Nguyen