US20090059807A1 - Systems and Methods to Monitor a Network - Google Patents

Systems and Methods to Monitor a Network Download PDF

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Publication number
US20090059807A1
US20090059807A1 US12/201,178 US20117808A US2009059807A1 US 20090059807 A1 US20090059807 A1 US 20090059807A1 US 20117808 A US20117808 A US 20117808A US 2009059807 A1 US2009059807 A1 US 2009059807A1
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network
data packets
edge switch
reflected
processor
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Bruce Alden Schine
Paul A. Tomalenas
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AT&T Intellectual Property I LP
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Publication of US20090059807A1 publication Critical patent/US20090059807A1/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
    • H04L43/087—Jitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • H04L41/5009—Determining service level performance parameters or violations of service level contracts, e.g. violations of agreed response time or mean time between failures [MTBF]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5061—Network service management, e.g. ensuring proper service fulfilment according to agreements characterised by the interaction between service providers and their network customers, e.g. customer relationship management
    • H04L41/5067—Customer-centric QoS measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/02—Standardisation; Integration
    • H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/22—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks comprising specially adapted graphical user interfaces [GUI]
    • 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
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0829—Packet loss
    • 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
    • H04L43/0864—Round trip delays
    • 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
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H04L43/0888—Throughput

Definitions

  • the present disclosure relates generally to the monitoring of networks.
  • Ethernet is a local-area network architecture that was developed in the late 1970s for use in offices, e.g., to interconnect computers to each other and to a common printer.
  • companies have begun to develop ways to expand Ethernet principles to wide area networks, e.g., using Internet routers that are interconnected in various ways. The result has been the creation of switched metro Ethernet data networks.
  • a service can be considered a high level service and may be offered at a premium price if it has certain characteristics that are beneficial to customers.
  • a service provider may offer a service in which data is delivered at a relatively high packet delivery rate.
  • a service level agreement between a service provider and a customer may state that the data will be delivered at or above a particular packet delivery rate and the customer will pay a particular fee for that promised packet delivery rate.
  • FIG. 1 is a diagram of a switched metro Ethernet system
  • FIG. 2 is a flow chart to illustrate a method for collecting one or more metrics related to a switched metro Ethernet system and presenting those metrics to a user;
  • FIG. 3 is a general diagram representative of an embodiment of a graphical user interface that can be used to present one or more metrics related to a switched metro Ethernet system
  • FIG. 4 is a general diagram representative of another embodiment of a graphical user interface that can be used to present one or more metrics related to a switched metro Ethernet system.
  • a method for monitoring a network includes injecting a plurality of data packets into the network.
  • the data packets are transmitted between a source device and a destination device.
  • a plurality of reflected data packets is collected.
  • the plurality of reflected data packets are reflected from the destination device to the source device.
  • the plurality of reflected data packets includes at least a portion of the data packets that are injected into the network.
  • the method further includes determining a total number of the reflected data packets.
  • a packet delivery rate, a latency value, and a jitter value can be calculated based at least partially on the total number of reflected data packets. Further, the packet delivery rate, the latency value, and the jitter value can be reported to a user.
  • the network is a switched metro Ethernet network and the plurality of data packets are created at a server and injected into an edge switch of the switched metro Ethernet network. Particularly, the plurality of data packets is created by a service assurance agent (SAA) within the server.
  • SAA service assurance agent
  • the source device is a first edge switch of a switched metro Ethernet network
  • the destination device is a second edge switch of the switched metro Ethernet network
  • the first edge switch is coupled to the second edge switch via a core system of the switched metro Ethernet network.
  • a server in another embodiment, includes a processor and a memory device that is coupled to the processor.
  • a service assurance agent (SAA) is embedded within the memory device and the SAA is executable by the processor.
  • the SAA includes instructions to inject a plurality of data packets into a switched metro Ethernet network from a source device to a destination device.
  • the SAA includes instructions to collect a plurality of data packets that are reflected from the destination device back to the source device.
  • a switched metro Ethernet network includes a core system.
  • a first edge switch and a second edge switch are coupled to the core system.
  • a computer program is embedded within the server.
  • the computer program includes instructions to calculate a data packet delivery rate between the first edge switch and the second edge switch.
  • a switched metro Ethernet network is shown and is generally designated 100 .
  • the switched metro Ethernet network 100 includes a core system 102 .
  • the core system 102 includes a plurality of switches and routers that can be used to route network traffic through the core system 102 .
  • the switches and routers are optical equipment.
  • a first edge switch 104 is coupled to the core system 102 .
  • a first customer premises equipment (CPE) 106 is coupled to the edge switch 104 .
  • FIG. 1 further shows a first user computer 108 coupled to the first CPE 106 .
  • the CPE 106 can be a modem, a gateway, or a router.
  • the first user computer 108 can be a desktop computer, a laptop computer, a handheld computer, or any other computer device.
  • the first user computer 108 includes a processor 110 and a display 112 that is coupled to the processor 110 .
  • a graphical user interface (GUI) 114 can be presented to a user at the first user computer 108 via the display 112 .
  • information regarding the switched metro Ethernet network 100 including one or more metrics concerning the operation of the switched metro Ethernet network 100 can be presented to a user via the GUI 114 .
  • FIG. 1 further shows a memory device 116 that is coupled to the processor 110 within the first user computer 108 .
  • a server 118 can be coupled to the first edge switch 104 .
  • the server 118 includes a processor 120 and a memory device 122 .
  • a service assurance agent (SAA) 124 is stored within the server 118 , e.g., within the memory device 122 .
  • the SAA 124 is a computer program that can have one or more instructions that can be executed by the processor 120 in order to collect and calculate one or more metrics concerning the operation of the switched metro Ethernet network 100 . Further, the SAA 124 can present the metrics or any data derived from the metrics to the user computer 108 via the GUI 114 .
  • FIG. 1 further shows that a second edge switch 126 is coupled to the core system 102 . Moreover, a second CPE 128 is connected to the second edge switch 126 . As illustrated in FIG. 1 , a second user computer 130 is also coupled to the second CPE 128 . In a particular embodiment, the second user computer 130 includes a processor 132 and a display 134 coupled thereto. Moreover, as illustrated in FIG. 1 , a GUI 136 can be presented to a user at the second user computer 130 . Particularly, information regarding the switched metro Ethernet network 100 including one or more metrics concerning the operation of the switched metro Ethernet network 100 can be presented to a user via the GUI 136 . FIG. 1 also shows a memory device 138 that is coupled to the processor 132 .
  • the first user computer 108 can be networked to the second user computer 130 by the first CPE 106 , the first edge switch 104 , the core system 102 , the second edge switch 126 and the second CPE 128 .
  • multiple offices of a single company at different locations can be networked via the switched metro Ethernet network 100 .
  • the method includes periodically creating a predetermined number of artificial data packets.
  • the artificial data packets are injected into the network from a source Internet protocol (IP) address toward a destination IP address, e.g., from the first edge switch 104 ( FIG. 1 ) to the second edge switch 126 ( FIG. 1 ).
  • IP Internet protocol
  • the artificial data packets can be created and injected into the network every fifteen minutes or less.
  • the packets are reflected, or otherwise returned, from the destination IP address back to the source IP address, e.g., from the second edge switch 126 ( FIG. 1 ) back to the first edge switch 104 ( FIG. 1 ).
  • the artificial data packets that have been reflected back to the source IP address are collected, e.g., by the SAA 124 ( FIG. 1 ) within the server 118 ( FIG. 1 ) coupled to the first edge switch 104 ( FIG. 1 ).
  • a total number of packets that are reflected, or otherwise returned, to the source IP address is determined.
  • a packet delivery rate is calculated based on the total number of returned packets.
  • the packet delivery rate is a measure of the percentage of packets that reach the destination IP address and that are reflected back to the source IP address. Packet delivery rate can be determined using the following formula:
  • the SAA 124 in order to determine a more reliable value for packet delivery rate, several metrics can be used by the SAA 124 ( FIG. 1 ).
  • Table 1 shows several exemplary, non-limiting metrics that can be used by the SAA 124 ( FIG. 1 ) in order to determine the packet delivery rate.
  • C rttMonLatestJitterStatsPacketLossDS The number of packets lost when sent from destination to source
  • D RttMonLatestJitterStatsPacketOutOfSequence
  • E rttMonLatestJitterStatsPacketMIA
  • F RttMonLatestJitterStatsPacketLateArrival The number of packets that arrived after the timeout
  • the metrics shown in Table 1 can be used to determine a packet delivery rate using the following formula:
  • a latency value is calculated based on the total number of returned packets.
  • latency is the delay that the packets experience as they flow through the network, e.g., from the first edge switch 104 to the second edge switch 126 and back.
  • latency can include the time that packets spend in buffers and the propagation delay.
  • several metrics can be used by the SAA 124 ( FIG. 1 ) in order to determine latency.
  • Table 2 shows several exemplary, non-limiting metrics that can be used by the SAA 124 ( FIG. 1 ) in order to determine the latency value.
  • rttMonLatestJitterStatsNumOfRTT The number of RTTs that are successfully measured rttMonLatestJitterStatsRTTSum
  • the sum of RTTs that are successfully measured rttMonLatestJitterStatsRTTMin The minimum of RTTs that were successfully measured rttMonLatestJitterStatsRTTMax
  • the maximum of RTTs that were successfully measured rttMonLatestJitterStatsRTTSum2Low The sum of squares of RTTs that are successfully measured rttMonLatestJitterStatsRTTSum2High (low/high order 32 bits)
  • rttMonJitterStatsOWSumSD The sum of one way times from source to destination rttMonJitterStatsOWMinSD The minimum of all one way times from source to destination.
  • rttMonJitterStatsOWMaxSD The maximum of all one way times from source to destination.
  • rttMonJitterStatsOWSumDS The sum of one way times from destination to source.
  • rttMonJitterStatsOWMinDS The minimum of all one way times from destination to source.
  • rttMonJitterStatsOWMaxDS The maximum of all one way times from destination to source.
  • rttMonJitterStatsNumOfOW The number of one way times that are successfully measured.
  • the RTT numbers can be divided by two. Further, rttMonLatestJitterStatsRTTSum2 Low and rttMonLatestJitterStatsRTTSum2High are optional metrics and can be collected if a calculation of a standard deviation is desired.
  • a jitter value is calculated based on the total number of returned packets.
  • jitter is defined as the variance in the inter-packet arrival rate at the destination.
  • several metrics can be used by the SAA 124 ( FIG. 1 ) in order to determine latency.
  • Table 3 shows several exemplary, non-limiting metrics that can be used by the SAA 124 ( FIG. 1 ) in order to determine the Jitter value.
  • rttMonJitterStatsMinOfPositivesSD The minimum of absolute values of all positive jitter values from packets sent from source to destination.
  • rttMonJitterStatsMaxOfPositivesSD The maximum of absolute values of all positive jitter values from packets sent from source to destination.
  • rttMonJitterStatsNumOfPositivesSD The sum of number of all positive jitter values from packets sent from source to destination.
  • rttMonJitterStatsSumOfPositivesSD The sum of all positive jitter values from packets sent from source to destination.
  • rttMonJitterStatsSum2PositivesSDLow The sum of square of RTT's of all positive jitter values from packets sent from source to destination (low order 32 bits).
  • rttMonJitterStatsMinOfNegativesSD The minimum of all negative jitter values from packets sent from source to destination.
  • rttMonJitterStatsMaxOfNegativesSD The maximum of all negative jitter values from packets sent from source to destination.
  • rttMonJitterStatsNumOfNegativesSD The sum of number of all negative jitter values from packets sent from source to destination.
  • rttMonJitterStatsSumOfNegativesSD The sum of RTT's of all negative jitter values from packets sent from source to destination.
  • rttMonJitterStatsSum2NegativesSDLow The sum of square of RTT's of all negative jitter values from packets sent from source to destination (low order 32 bits).
  • rttMonJitterStatsSum2NegativesSDHigh The sum of square of RTT's of all negative jitter values from packets sent from source to destination (high order 32 bits).
  • rttMonJitterStatsMinOfPositivesDS The minimum of absolute values of all positive jitter values from packets sent from destination to source.
  • rttMonJitterStatsMaxOfPositivesDS The maximum of absolute values of all positive jitter values from packets sent from destination to source.
  • rttMonJitterStatsNumOfPositivesDS The sum of number of all positive jitter values from packets sent from destination to source.
  • rttMonJitterStatsSumOfPositivesDS The sum of all positive jitter values from packets sent from destination to source.
  • rttMonJitterStatsSum2PositivesDSLow The sum of square of RTT's of all positive jitter values from packets sent from destination to source (low order 32 bits).
  • rttMonJitterStatsSum2PositivesDSHigh sum of square of RTT's of all positive jitter values from packets sent from destination to source (high order 32 bits).
  • rttMonJitterStatsMinOfNegativesDS The minimum of all negative jitter values from packets sent from destination to source.
  • rttMonJitterStatsMaxOfNegativesDS The maximum of all negative jitter values from packets sent from destination to source.
  • rttMonJitterStatsNumOfNegativesDS The sum of number of all negative jitter values from packets sent from destination to source.
  • rttMonJitterStatsSumOfNegativesDS The sum of RTT's of all negative jitter values from packets sent from destination to source.
  • rttMonJitterStatsSum2NegativesDSLow The sum of square of RTT's of all negative jitter values from packets sent from destination to source (low order 32 bits).
  • rttMonJitterStatsSum2NegativesDSHigh The sum of square of RTT's of all negative jitter values from packets sent from destination to source (high order 32 bits).
  • a maximum jitter value from a source to a destination is defined as the maximum between these values: rttMonJitterStatsNumOfNegativesSD and rttMonJitterStatsNumOfPositivesSD.
  • the metrics described herein are simple network management protocol management information base (SNMP MIB) objects that can be collected using an SNMP collection mechanism.
  • SNMP MIB simple network management protocol management information base
  • the packet delivery rate, the latency value, and the jitter value are reported to a user.
  • the packet delivery rate, the latency value, and the jitter value are reported to the user via a GUI 114 , 136 ( FIG. 1 ) presented at one of the user computers 108 , 130 ( FIG. 1 ) and the method ends at state 218 .
  • the metrics described above and collected by the SAA 124 can be used to enhance or optimize the switched metro Ethernet network ( FIG. 1 ). For example, if a user notices that a packet delivery rate between two locations is not at or above a stated value in a service level agreement, the user can contact the service provider who can verify the packet delivery rate and then, determine the cause of the problem and correct the problem, if possible.
  • GUI 300 an exemplary, non-limiting embodiment of a graphical user interface (GUI) is shown and is generally designated 300 .
  • the GUI 300 includes a graphical representation of a user's network 302 showing a core network 304 and different CPE 306 and their locations.
  • the GUI 300 includes an information window 308 that provides information relevant to the CPE 306 when each is selected by a user.
  • FIG. 3 also shows that the GUI 300 includes an information table 310 that provides network trouble information, e.g., device type, problem severity, reason, and date/time.
  • FIG. 4 shows another exemplary, non-limiting embodiment of a GUI, designated 400 .
  • the GUI 400 shown in FIG. 4 includes a matrix 402 of information blocks 404 .
  • a user can use the GUI 400 to determine a jitter value, a latency value, and a packet delivery rate between two CPEs within a switched metro Ethernet network.
  • the GUI 400 can indicate a level of service provided for in a service level agreement.
  • the GUI 400 can indicate the level of service by providing a certain color within the information blocks 404 , e.g., bronze, silver, or gold.
  • the system and method for collecting and presenting service level agreement metrics disclosed herein provides the capability for determining jitter, latency, and packet delivery rate between two edge switches within a switched metro Ethernet.
  • Each edge switch is coupled to a CPE and each edge switch represents the outer boundary of the portion of a switched metro Ethernet that is under the control of a service provider.
  • the system and method can provide a close approximation of the jitter, latency, and packet delivery rate between the two CPEs coupled to the edge switches.
  • a GUI is provided for presenting the jitter, latency, and packet delivery rate information to a user via a computer. Using the information presented via the GUI, a user can verify that the terms of a service level agreement are being met.

Abstract

Systems and methods to monitor a network are provided. A particular method includes determining a data packet delivery rate between a first edge switch and a second edge switch coupled to a network. The method also includes sending the data packet delivery rate to a user device, operably coupled to a customer equipment side of the first edge switch, as graphical user interface display data.

Description

    CLAIM OF PRIORITY
  • The present application claims priority from and is a continuation of patent application Ser. No. 10/975,022 filed on Oct. 27, 2004 and entitled “System and Method for Collection and Presenting Service Level Agreement Metrics in a Switched Metro Ethernet Network,” the contents of which are expressly incorporated herein by reference in their entirety.
    • FIELD OF THE DISCLOSURE
  • The present disclosure relates generally to the monitoring of networks.
    • BACKGROUND
  • Ethernet is a local-area network architecture that was developed in the late 1970s for use in offices, e.g., to interconnect computers to each other and to a common printer. In recent years, companies have begun to develop ways to expand Ethernet principles to wide area networks, e.g., using Internet routers that are interconnected in various ways. The result has been the creation of switched metro Ethernet data networks.
  • In an effort to market switched metro Ethernet services, service providers can offer varying levels of service for different prices. Moreover, a service can be considered a high level service and may be offered at a premium price if it has certain characteristics that are beneficial to customers. For example, a service provider may offer a service in which data is delivered at a relatively high packet delivery rate. Further, a service level agreement between a service provider and a customer may state that the data will be delivered at or above a particular packet delivery rate and the customer will pay a particular fee for that promised packet delivery rate. However, it can be difficult to provide an indication to a customer that the service they are receiving is meeting the level agreed to in the service level agreement.
  • Accordingly, there is a need for a system and method for collecting and presenting service level agreement metrics in a switched metro Ethernet network.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a diagram of a switched metro Ethernet system;
  • FIG. 2 is a flow chart to illustrate a method for collecting one or more metrics related to a switched metro Ethernet system and presenting those metrics to a user;
  • FIG. 3 is a general diagram representative of an embodiment of a graphical user interface that can be used to present one or more metrics related to a switched metro Ethernet system; and
  • FIG. 4 is a general diagram representative of another embodiment of a graphical user interface that can be used to present one or more metrics related to a switched metro Ethernet system.
    •  DETAILED DESCRIPTION
  • A method for monitoring a network includes injecting a plurality of data packets into the network. The data packets are transmitted between a source device and a destination device. A plurality of reflected data packets is collected. In a particular embodiment, the plurality of reflected data packets are reflected from the destination device to the source device. Also, the plurality of reflected data packets includes at least a portion of the data packets that are injected into the network.
  • In a particular embodiment, the method further includes determining a total number of the reflected data packets. A packet delivery rate, a latency value, and a jitter value can be calculated based at least partially on the total number of reflected data packets. Further, the packet delivery rate, the latency value, and the jitter value can be reported to a user. Also, in a particular embodiment, the network is a switched metro Ethernet network and the plurality of data packets are created at a server and injected into an edge switch of the switched metro Ethernet network. Particularly, the plurality of data packets is created by a service assurance agent (SAA) within the server. Further, in a particular embodiment, the source device is a first edge switch of a switched metro Ethernet network, the destination device is a second edge switch of the switched metro Ethernet network, and the first edge switch is coupled to the second edge switch via a core system of the switched metro Ethernet network.
  • In another embodiment, a server includes a processor and a memory device that is coupled to the processor. A service assurance agent (SAA) is embedded within the memory device and the SAA is executable by the processor. In a particular embodiment, the SAA includes instructions to inject a plurality of data packets into a switched metro Ethernet network from a source device to a destination device. Moreover, the SAA includes instructions to collect a plurality of data packets that are reflected from the destination device back to the source device.
  • In yet another embodiment, a switched metro Ethernet network includes a core system. A first edge switch and a second edge switch are coupled to the core system. Further, a computer program is embedded within the server. In a particular embodiment, the computer program includes instructions to calculate a data packet delivery rate between the first edge switch and the second edge switch.
  • Referring to FIG. 1, a switched metro Ethernet network is shown and is generally designated 100. As shown, the switched metro Ethernet network 100 includes a core system 102. Particularly, the core system 102 includes a plurality of switches and routers that can be used to route network traffic through the core system 102. In a particular embodiment, the switches and routers are optical equipment. As illustrated in FIG. 1, a first edge switch 104 is coupled to the core system 102. Also, a first customer premises equipment (CPE) 106 is coupled to the edge switch 104. FIG. 1 further shows a first user computer 108 coupled to the first CPE 106. In a particular embodiment, the CPE 106 can be a modem, a gateway, or a router. Further, the first user computer 108 can be a desktop computer, a laptop computer, a handheld computer, or any other computer device.
  • In a particular embodiment, the first user computer 108 includes a processor 110 and a display 112 that is coupled to the processor 110. Moreover, as illustrated in FIG. 1, a graphical user interface (GUI) 114 can be presented to a user at the first user computer 108 via the display 112. In a particular embodiment, information regarding the switched metro Ethernet network 100 including one or more metrics concerning the operation of the switched metro Ethernet network 100 can be presented to a user via the GUI 114. FIG. 1 further shows a memory device 116 that is coupled to the processor 110 within the first user computer 108.
  • As shown in FIG. 1, a server 118 can be coupled to the first edge switch 104. In a particular embodiment, the server 118 includes a processor 120 and a memory device 122. Further, in a particular embodiment, a service assurance agent (SAA) 124 is stored within the server 118, e.g., within the memory device 122. In a particular embodiment, the SAA 124 is a computer program that can have one or more instructions that can be executed by the processor 120 in order to collect and calculate one or more metrics concerning the operation of the switched metro Ethernet network 100. Further, the SAA 124 can present the metrics or any data derived from the metrics to the user computer 108 via the GUI 114.
  • FIG. 1 further shows that a second edge switch 126 is coupled to the core system 102. Moreover, a second CPE 128 is connected to the second edge switch 126. As illustrated in FIG. 1, a second user computer 130 is also coupled to the second CPE 128. In a particular embodiment, the second user computer 130 includes a processor 132 and a display 134 coupled thereto. Moreover, as illustrated in FIG. 1, a GUI 136 can be presented to a user at the second user computer 130. Particularly, information regarding the switched metro Ethernet network 100 including one or more metrics concerning the operation of the switched metro Ethernet network 100 can be presented to a user via the GUI 136. FIG. 1 also shows a memory device 138 that is coupled to the processor 132.
  • With this configuration of structure, the first user computer 108 can be networked to the second user computer 130 by the first CPE 106, the first edge switch 104, the core system 102, the second edge switch 126 and the second CPE 128. In a particular example, multiple offices of a single company at different locations can be networked via the switched metro Ethernet network 100.
  • Referring to FIG. 2, a method for collecting one or more metrics related to a switched metro Ethernet system and for presenting those metrics to a user is disclosed. Commencing at block 200, the method includes periodically creating a predetermined number of artificial data packets. At block 202, the artificial data packets are injected into the network from a source Internet protocol (IP) address toward a destination IP address, e.g., from the first edge switch 104 (FIG. 1) to the second edge switch 126 (FIG. 1). In an illustrative embodiment, the artificial data packets can be created and injected into the network every fifteen minutes or less. Moving to block 204, the packets are reflected, or otherwise returned, from the destination IP address back to the source IP address, e.g., from the second edge switch 126 (FIG. 1) back to the first edge switch 104 (FIG. 1). Next, at block 206, the artificial data packets that have been reflected back to the source IP address are collected, e.g., by the SAA 124 (FIG. 1) within the server 118 (FIG. 1) coupled to the first edge switch 104 (FIG. 1).
  • Moving to block 208, a total number of packets that are reflected, or otherwise returned, to the source IP address is determined. At block 210, a packet delivery rate is calculated based on the total number of returned packets. In a particular embodiment, the packet delivery rate is a measure of the percentage of packets that reach the destination IP address and that are reflected back to the source IP address. Packet delivery rate can be determined using the following formula:

  • PDR=(packets delivered to destination)/(packets offered at source)
  • In a particular embodiment, in order to determine a more reliable value for packet delivery rate, several metrics can be used by the SAA 124 (FIG. 1). Table 1 shows several exemplary, non-limiting metrics that can be used by the SAA 124 (FIG. 1) in order to determine the packet delivery rate.
  • TABLE 1
    Exemplary, non-limiting metrics used by the SAA in order to determine a Packet Delivery Rate.
    Variable Measurement Description
    A rttMonLatestJitterStatsNumOfRTT The number of round trip times (RTTs) that are
    successfully measured
    B rttMonLatestJitterStatsPacketLossSD The number of packets lost when sent from source
    to destination.
    C rttMonLatestJitterStatsPacketLossDS The number of packets lost when sent from
    destination to source
    D RttMonLatestJitterStatsPacketOutOfSequence The number of packets arrived out of sequence
    E rttMonLatestJitterStatsPacketMIA The number of packets that are lost for which we
    cannot determine the direction.
    F RttMonLatestJitterStatsPacketLateArrival The number of packets that arrived after the
    timeout
  • Moreover, in a particular embodiment, the metrics shown in Table 1 can be used to determine a packet delivery rate using the following formula:

  • PDR=(ΣA*100)/(ΣA+ΣB+ΣC+ΣD+ΣE+ΣF)
  • Returning to the description of FIG. 2, at block 212, a latency value is calculated based on the total number of returned packets. In an illustrative embodiment, latency is the delay that the packets experience as they flow through the network, e.g., from the first edge switch 104 to the second edge switch 126 and back. Particularly, latency can include the time that packets spend in buffers and the propagation delay. In a particular embodiment, several metrics can be used by the SAA 124 (FIG. 1) in order to determine latency. Table 2 shows several exemplary, non-limiting metrics that can be used by the SAA 124 (FIG. 1) in order to determine the latency value.
  • TABLE 2
    Exemplary, non-limiting metrics used by the SAA in order to determine a latency value.
    Measurement Description
    rttMonLatestJitterStatsNumOfRTT The number of RTTs that are successfully measured
    rttMonLatestJitterStatsRTTSum The sum of RTTs that are successfully measured
    rttMonLatestJitterStatsRTTMin The minimum of RTTs that were successfully measured
    rttMonLatestJitterStatsRTTMax The maximum of RTTs that were successfully measured
    rttMonLatestJitterStatsRTTSum2Low The sum of squares of RTTs that are successfully measured
    rttMonLatestJitterStatsRTTSum2High (low/high order 32 bits)
    rttMonJitterStatsOWSumSD The sum of one way times from source to destination
    rttMonJitterStatsOWMinSD The minimum of all one way times from source to destination.
    rttMonJitterStatsOWMaxSD The maximum of all one way times from source to destination.
    rttMonJitterStatsOWSumDS The sum of one way times from destination to source.
    rttMonJitterStatsOWMinDS The minimum of all one way times from destination to source.
    rttMonJitterStatsOWMaxDS The maximum of all one way times from destination to source.
    rttMonJitterStatsNumOfOW The number of one way times that are successfully measured.
  • In a particular embodiment, in order to calculate latency in one direction, e.g., from the first edge switch 104 (FIG. 1) to the second edge switch 126 (FIG. 1), the RTT numbers can be divided by two. Further, rttMonLatestJitterStatsRTTSum2 Low and rttMonLatestJitterStatsRTTSum2High are optional metrics and can be collected if a calculation of a standard deviation is desired.
  • Continuing the description of FIG. 2, at block 214, a jitter value is calculated based on the total number of returned packets. In a particular embodiment, jitter is defined as the variance in the inter-packet arrival rate at the destination. In a particular embodiment, several metrics can be used by the SAA 124 (FIG. 1) in order to determine latency. Table 3 shows several exemplary, non-limiting metrics that can be used by the SAA 124 (FIG. 1) in order to determine the Jitter value.
  • TABLE 3
    Exemplary, non-limiting metrics used by the SAA in order to determine a jitter value.
    Measurement Description
    rttMonJitterStatsMinOfPositivesSD The minimum of absolute values of all positive jitter values from
    packets sent from source to destination.
    rttMonJitterStatsMaxOfPositivesSD The maximum of absolute values of all positive jitter values from
    packets sent from source to destination.
    rttMonJitterStatsNumOfPositivesSD The sum of number of all positive jitter values from packets sent
    from source to destination.
    rttMonJitterStatsSumOfPositivesSD The sum of all positive jitter values from packets sent from source
    to destination.
    rttMonJitterStatsSum2PositivesSDLow The sum of square of RTT's of all positive jitter values from
    packets sent from source to destination (low order 32 bits).
    rttMonJitterStatsSum2PositivesSDHigh The sum of square of RTT's of all positive jitter values from
    packets sent from source to destination (high order 32 bits).
    rttMonJitterStatsMinOfNegativesSD The minimum of all negative jitter values from packets sent from
    source to destination.
    rttMonJitterStatsMaxOfNegativesSD The maximum of all negative jitter values from packets sent from
    source to destination.
    rttMonJitterStatsNumOfNegativesSD The sum of number of all negative jitter values from packets sent
    from source to destination.
    rttMonJitterStatsSumOfNegativesSD The sum of RTT's of all negative jitter values from packets sent
    from source to destination.
    rttMonJitterStatsSum2NegativesSDLow The sum of square of RTT's of all negative jitter values from
    packets sent from source to destination (low order 32 bits).
    rttMonJitterStatsSum2NegativesSDHigh The sum of square of RTT's of all negative jitter values from
    packets sent from source to destination (high order 32 bits).
    rttMonJitterStatsMinOfPositivesDS The minimum of absolute values of all positive jitter values from
    packets sent from destination to source.
    rttMonJitterStatsMaxOfPositivesDS The maximum of absolute values of all positive jitter values from
    packets sent from destination to source.
    rttMonJitterStatsNumOfPositivesDS The sum of number of all positive jitter values from packets sent
    from destination to source.
    rttMonJitterStatsSumOfPositivesDS The sum of all positive jitter values from packets sent from
    destination to source.
    rttMonJitterStatsSum2PositivesDSLow The sum of square of RTT's of all positive jitter values from
    packets sent from destination to source (low order 32 bits).
    rttMonJitterStatsSum2PositivesDSHigh The sum of square of RTT's of all positive jitter values from
    packets sent from destination to source (high order 32 bits).
    rttMonJitterStatsMinOfNegativesDS The minimum of all negative jitter values from packets sent from
    destination to source.
    rttMonJitterStatsMaxOfNegativesDS The maximum of all negative jitter values from packets sent from
    destination to source.
    rttMonJitterStatsNumOfNegativesDS The sum of number of all negative jitter values from packets sent
    from destination to source.
    rttMonJitterStatsSumOfNegativesDS The sum of RTT's of all negative jitter values from packets sent
    from destination to source.
    rttMonJitterStatsSum2NegativesDSLow The sum of square of RTT's of all negative jitter values from
    packets sent from destination to source (low order 32 bits).
    rttMonJitterStatsSum2NegativesDSHigh The sum of square of RTT's of all negative jitter values from
    packets sent from destination to source (high order 32 bits).
  • In a particular embodiment, to calculate an average jitter value from a source to destination the following equation can be used:

  • (rttMonJitterStatsSumOfPositivesSD+rttMonJitterStatsSumOfNegativesSD)/(rttMonJitterStatsNumOfPositivesSD+rttMonJitterStatsNumOfNegativesSD)
  • Further, to calculate an average jitter value from a destination to a source, the following equation can be used:

  • (rttMonJitterStatsSumOfPositivesDS+rttMonJitterStatsSumOfNegativesDS)/(rttMonJitterStatsNumOfPositivesDS+rttMonJifterStatsNumOfNegativesDS)
  • Additionally, a maximum jitter value from a source to a destination is defined as the maximum between these values: rttMonJitterStatsNumOfNegativesSD and rttMonJitterStatsNumOfPositivesSD.
  • In an illustrative embodiment, the metrics described herein are simple network management protocol management information base (SNMP MIB) objects that can be collected using an SNMP collection mechanism.
  • Returning to FIG. 2, at block 216, the packet delivery rate, the latency value, and the jitter value are reported to a user. In a particular embodiment, the packet delivery rate, the latency value, and the jitter value are reported to the user via a GUI 114, 136 (FIG. 1) presented at one of the user computers 108, 130 (FIG. 1) and the method ends at state 218.
  • In a particular embodiment, the metrics described above and collected by the SAA 124 (FIG. 1) can be used to enhance or optimize the switched metro Ethernet network (FIG. 1). For example, if a user notices that a packet delivery rate between two locations is not at or above a stated value in a service level agreement, the user can contact the service provider who can verify the packet delivery rate and then, determine the cause of the problem and correct the problem, if possible.
  • Referring now to FIG. 3, an exemplary, non-limiting embodiment of a graphical user interface (GUI) is shown and is generally designated 300. As shown, the GUI 300 includes a graphical representation of a user's network 302 showing a core network 304 and different CPE 306 and their locations. Further, the GUI 300 includes an information window 308 that provides information relevant to the CPE 306 when each is selected by a user. FIG. 3 also shows that the GUI 300 includes an information table 310 that provides network trouble information, e.g., device type, problem severity, reason, and date/time.
  • FIG. 4 shows another exemplary, non-limiting embodiment of a GUI, designated 400. The GUI 400 shown in FIG. 4 includes a matrix 402 of information blocks 404. A user can use the GUI 400 to determine a jitter value, a latency value, and a packet delivery rate between two CPEs within a switched metro Ethernet network. Further, the GUI 400 can indicate a level of service provided for in a service level agreement. In a particular embodiment, the GUI 400 can indicate the level of service by providing a certain color within the information blocks 404, e.g., bronze, silver, or gold.
  • With the configuration of structure described above, the system and method for collecting and presenting service level agreement metrics disclosed herein provides the capability for determining jitter, latency, and packet delivery rate between two edge switches within a switched metro Ethernet. Each edge switch is coupled to a CPE and each edge switch represents the outer boundary of the portion of a switched metro Ethernet that is under the control of a service provider. As such, the system and method can provide a close approximation of the jitter, latency, and packet delivery rate between the two CPEs coupled to the edge switches. Further, a GUI is provided for presenting the jitter, latency, and packet delivery rate information to a user via a computer. Using the information presented via the GUI, a user can verify that the terms of a service level agreement are being met.
  • The above-disclosed subject matter is to be considered illustrative, and not restrictive, and the appended claims are intended to cover all such modifications, enhancements, and other embodiments, which fall within the true spirit and scope of the present invention. Thus, to the maximum extent allowed by law, the scope of the present invention is to be determined by the broadest permissible interpretation of the following claims and their equivalents, and shall not be restricted or limited by the foregoing detailed description.

Claims (20)

1. A method, comprising:
determining a data packet delivery rate between a first edge switch coupled to a network and a second edge switch coupled to the network; and
sending the data packet delivery rate to a user device, operably coupled to a customer equipment side of the first edge switch, as graphical user interface display data.
2. The method of claim 1, wherein the data packet delivery rate is determined by collecting a plurality of data packets, wherein the plurality of data packets are reflected from the second edge switch to the first edge switch.
3. The method of claim 2, wherein the plurality of data packets are injected into the network at the first edge switch.
4. The method of claim 2, further comprising:
determining a latency value based at least partially on the plurality of data packets; and
sending the latency value to the user device.
5. The method of claim 2, further comprising:
determining a jitter value based at least partially on the plurality of data packets; and
sending the jitter value to the user device.
6. The method of claim 1, wherein the graphical user interface display data comprises configuration data related to the network.
7. The method of claim 6, wherein the configuration data includes a graphical representation of the network.
8. The method of claim 1, wherein the graphical user interface display data comprises service level information indicated by color.
9. The method of claim 1, wherein the graphical user interface display data comprises information regarding a service level agreement.
10. The method of claim 1, wherein the graphical user interface display data comprises trouble information related to the network.
11. A memory device, comprising
instructions that are executable by a processor to cause the processor to collect a plurality of reflected data packets, wherein the plurality of reflected data packets are reflected from a destination device to a source device of a network; and
instructions that are executable by the processor to cause the processor to report results from the collecting of the plurality of reflected data packets to a user device operably coupled to a customer equipment side of the source device.
12. The memory of claim 11, when a plurality of data packets are injected into the network, and wherein the plurality of reflected data packets include at least a portion of the plurality of data packets injected into the network.
13. The memory of claim 11, wherein reporting the results from the collecting of the plurality of reflected data packets to the user device comprises generating a graphical user interface including service level information related to the network.
14. The memory of claim 13, wherein the graphical user interface comprises a matrix including service level information related to a portion of the network.
15. The memory of claim 11, wherein the results from the collecting of the plurality of reflected data packets include an average jitter value.
16. The memory of claim 11, wherein the results from the collecting of the plurality of reflected data packets include a packet delivery rate.
17. The memory of claim 11, wherein the results from the collecting of the plurality of reflected data packets include a total number of data packets reflected from the destination device.
18. A memory device, comprising
instructions that are executable by a processor to cause the processor to determine a data packet delivery rate between a first edge switch coupled to a network and a second edge switch coupled to the network; and
instructions that are executable by the processor to cause the processor to send the data packet delivery rate to a user device as graphical user interface display data, wherein the user device is operably coupled to a customer equipment side of the first edge switch.
19. The memory device of claim 18, further comprising instructions that are executable by the processor to cause the processor to determine a total number of data packet reflected from the second edge switch to the first edge switch, wherein the data packet delivery rate is determined based on the total number of the data packets reflected.
20. The memory device of claim 18, wherein the network comprises a switched metro Ethernet network.
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