WO2001076182A3 - Method and apparatus for determining latency between multiple servers and a client - Google Patents

Method and apparatus for determining latency between multiple servers and a client Download PDF

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Publication number
WO2001076182A3
WO2001076182A3 PCT/US2001/010524 US0110524W WO0176182A3 WO 2001076182 A3 WO2001076182 A3 WO 2001076182A3 US 0110524 W US0110524 W US 0110524W WO 0176182 A3 WO0176182 A3 WO 0176182A3
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WO
WIPO (PCT)
Prior art keywords
latency
metric
sent
addresses
management table
Prior art date
Application number
PCT/US2001/010524
Other languages
French (fr)
Other versions
WO2001076182A2 (en
Inventor
Shankar Iyer
Sridhara Lanka
Original Assignee
Speedera Networks Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Speedera Networks Inc filed Critical Speedera Networks Inc
Priority to AU2001247925A priority Critical patent/AU2001247925A1/en
Publication of WO2001076182A2 publication Critical patent/WO2001076182A2/en
Publication of WO2001076182A3 publication Critical patent/WO2001076182A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/12—Shortest path evaluation
    • H04L45/121—Shortest path evaluation by minimising delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/35—Network arrangements, protocols or services for addressing or naming involving non-standard use of addresses for implementing network functionalities, e.g. coding subscription information within the address or functional addressing, i.e. assigning an address to a function
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping

Abstract

A method and apparatus for determining latency between multiple servers and a client receives requests for content server addresses from local domain names servers (LDNS). POPs that can serve the content are determined and sent latency metric requests. The content server receives the request for latency metrics and looks up the latency metric for the requesting client. Periodic latency probes are sent to the IP addresses in a Latency Management Table. The IP addresses of clients are masked so the latency probes are sent to higher level servers to reduce traffic across the network. The hop count and latency data in the packets sent in response to the latency probes are stored in the Latency Management Table and are used to determine the latency metric from the resident POP to the requesting client before sending the latency metric to the requesting server. The BGP hop count in the Latency Management Table is used for the latency metric upon the first request for an IP address. The latency metric is calculated for subsequent requests of IP addresses using the hop count and RTT data in the Latency Management Table. Latency metrics from POPs are collected and the inverse relationship of the hop counts in a weighted combination with the RTT are used to determine which latency metric indicates the optimal POP. The address of the optimal POP is then sent to the requesting LDNS.
PCT/US2001/010524 2000-03-31 2001-03-30 Method and apparatus for determining latency between multiple servers and a client WO2001076182A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001247925A AU2001247925A1 (en) 2000-03-31 2001-03-30 Method and apparatus for determining latency between multiple servers and a client

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US19398800P 2000-03-31 2000-03-31
US60/193,988 2000-03-31
US09/657,016 2000-09-07
US09/657,016 US7058706B1 (en) 2000-03-31 2000-09-07 Method and apparatus for determining latency between multiple servers and a client

Publications (2)

Publication Number Publication Date
WO2001076182A2 WO2001076182A2 (en) 2001-10-11
WO2001076182A3 true WO2001076182A3 (en) 2003-11-06

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Family Applications (1)

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Country Status (3)

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US (1) US7058706B1 (en)
AU (1) AU2001247925A1 (en)
WO (1) WO2001076182A2 (en)

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