EP4107910A1 - Dispositif de réseau et procédé de collecte et de traitement d'informations de paquet avec le dispositif de réseau - Google Patents

Dispositif de réseau et procédé de collecte et de traitement d'informations de paquet avec le dispositif de réseau

Info

Publication number
EP4107910A1
EP4107910A1 EP20789054.2A EP20789054A EP4107910A1 EP 4107910 A1 EP4107910 A1 EP 4107910A1 EP 20789054 A EP20789054 A EP 20789054A EP 4107910 A1 EP4107910 A1 EP 4107910A1
Authority
EP
European Patent Office
Prior art keywords
network device
memory
time
time stamp
metadata
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP20789054.2A
Other languages
German (de)
English (en)
Inventor
Florian MÜCK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hirschmann Automation and Control GmbH
Original Assignee
Hirschmann Automation and Control GmbH
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 Hirschmann Automation and Control GmbH filed Critical Hirschmann Automation and Control GmbH
Publication of EP4107910A1 publication Critical patent/EP4107910A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/069—Management of faults, events, alarms or notifications using logs of notifications; Post-processing of notifications
    • 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
    • H04L43/02—Capturing of monitoring data
    • H04L43/028—Capturing of monitoring data by filtering
    • 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
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
    • 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
    • H04L43/12—Network monitoring probes

Definitions

  • the invention relates to a network device and a method for acquiring and processing packet information by means of a network device.
  • a visualization to the temporal sequence of incoming and outgoing data packets in a network device using hardware extensions within this unit "according to the features of the preamble of claim 1 can be made.
  • Corresponding hardware devices are required in computer networks in order to be able to send and distribute data from one terminal device to another.
  • the data is divided into data packets.
  • TCP / IP networks are known for this purpose.
  • network devices represent simple nodes (network nodes) in order to generate a star point for end devices. These devices are known as a network hub.
  • network devices which contain a programmable controller in order to distribute the data packets in a targeted manner in a network. These devices are called a network switch.
  • time stamping of packets can be found in existing applications of the prior art.
  • IEEE 1588 it is used for the purpose of time synchronization, with only certain packets being time stamped here.
  • Ethernet test devices which take high-precision time stamps, but which are not integrated in a network node.
  • the invention is therefore based on the task of creating diagnostic options for “Time Sensitive Networking” (TSN) networks which enable detailed insights into the time behavior of the packets involved. Such a diagnosis can then be used to check the actual implementation of a transmission schedule for the data packets. Furthermore, a solution integrated in a network device is to be created.
  • TSN Time Sensitive Networking
  • a network device which forms a node in a network.
  • the network device contains at least two ports, each port containing a transmitting unit and a receiving unit.
  • the participants in the network are connected via the ports so that the network device forms a star point in the network.
  • Each receiving unit and each sending unit also contain a time stamp unit, which can assign time stamps to the incoming and outgoing data packets of a port.
  • the network device has an internal memory for storing these time stamps.
  • a network device which has several ports creates a time stamp for each data packet for each incoming and outgoing packet in each port.
  • This time stamp can be derived from a precise hardware clock which, for example, can be synchronized across the network using network-based time synchronization methods, as known from IEEE 1588.
  • time stamps are aggregated in the central memory within the network device for further processing.
  • the time stamp can then be used to trace at any time the point in time at which the individual data packets were accepted and / or sent on the network device. This makes it possible to determine the transmission times between two network devices.
  • the query of the time stamps from the ports is managed by a central instance, called an arbiter, before they are stored in the central memory.
  • This instance also manages the available bandwidth for the time stamp data of the ports.
  • the ports can also arrange their time stamp data in a “daisy chain” topology for such data.
  • the arbiter can thus filter the time stamps of the ports and store them in memory. As a result, an overview of time stamps can be generated in the memory, from which it can be derived whether packages were delivered on time.
  • time stamp available in the memory determines that the sending of a data packet is taking too long, it can be sent earlier. For this purpose, sending times to the individual network participants can be calculated in advance using the time stamp.
  • the arbiter does not have to collect all time stamps in the memory, but can store time stamps in the memory according to defined rules. If, for example, the transmission times to a network participant can already be calculated using existing time stamps, further time stamps can be filtered, which means that they are not stored in the memory. The arbiter can also collect old time stamps in the memory. The data packets that can be generated by packet generation from the time stamps collected in the memory can also be transferred to the ports in accordance with the aforementioned determination of the dispatch times.
  • time stamps can be enriched with further data packet-related information in order to show even more detailed data about the network traffic.
  • the time stamps enriched with further data are referred to below as metadata
  • Whether and which metadata is used for enrichment can be configured by the user in order to tailor the resulting amount of data to the needs.
  • metadata for data reduction using hash methods can be mapped to fewer useful data bits if necessary, with the acceptance of hash collisions, since a large amount of metadata can arise in the switch when there is a high traffic load.
  • pre-filtering can be carried out to match one or more data fields mentioned in the metadata to be enriched in order to only record metadata that is of interest . Entire ports in the send and / or receive direction can also be excluded from the metadata generation here. This also lowers the load.
  • a loss of metadata caused by overloading the interface of the central memory can be detected by the event generators and / or the arbiter. This loss is saved and encoded in the next metadata that is successfully transferred to the central memory, so that information about the temporary loss of information due to overloading can be generated. This can be done via the
  • Ports or suitable signaling devices are output on the network device.
  • the metadata are further processed into Ethernet packets based on the content of the central memory.
  • the address and control data of these packages can be programmed by the user. If certain criteria exist (fill level of the central memory, expiry of a time interval), the Ethernet packets are transferred to ports of the switch that can be selected by the user or are specified by the switch tables for sending packets.
  • the normal dispatch mechanisms are used here in order not to disturb the real-time behavior of a TSN schedule.
  • An entity for example software
  • An entity in the switch's network can receive metadata packets from one or more network devices using the method, filter, aggregate and process them for display.
  • Ethernet packets in the network device avoids latency and bandwidth-limited Qut-of-Band mechanisms, such as the register set of the network device, which can be connected to an already heavily used CPU via a bus with low bandwidth.
  • the central memory can be read out using out-of-band mechanisms, such as the register set of the network device.
  • FIG. 1 An overview of a network device according to the invention with event generators in transmitting (TX) and receiving units (RX),
  • FIG. 1 shows a network device 10 according to the invention with four ports. These ports are each subdivided into a transmitting unit 2 and a receiving unit 1. The terminal devices of the network are connected to these ports and the network device can use them to receive data packets (to the receiving units 1) and send them (to the transmitting units 2).
  • the network device contains a memory 12 which can store digital data and which can be called up.
  • the transmitting 2 and receiving units 1 are also equipped with time stamp units 4, which are suitable for assigning time stamps to the incoming and outgoing data packets and storing them in memory 12.
  • the transmitting 2 and receiving units 1 are equipped with event generators 3, which assign metadata to the individual time stamps, such as incoming and / or outgoing data packets,
  • the time stamps enriched as metadata are made available to an arbiter 11. After arbitration, the metadata is stored in the central memory. If the shipping conditions are met, the sending takes place as an Ethernet packet via the sending units 2. This can be done, for example, via the packet generation 13, which feeds the generated packets to the parcel shipping 14 and thus the individual ports or sending units 2.
  • the transmission units 2 to which the packet is sent is configured by the user or determined via tables in the network device.
  • the shipping conditions for triggering the shipment of a package with time stamp data are configurable and can be (in a non-exhaustive list);
  • the present invention is not limited to the foregoing features. Rather, further configurations are possible. So could an instance in the network be provided, which collects the information aggregated in packets from various network nodes and aggregates them further.
  • the novelty consists in the integration into a network device, which up to now has possibly only used time stamps for the purpose of time synchronization. Only through this integration can the time behavior of all or filtered traffic in a productive environment be measured without changing the topology or interrupting data streams.
  • the generation of data packets for sending the metadata by an event generator means that the CPU assigned to the network device is not burdened with this task.
  • Metadata from several network devices supporting the method in a network can be acquired through the use of MAC addresses from one or more measuring stations processing the data packets through switching in the network.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un dispositif de réseau (10) comprenant au moins deux ports pour la connexion d'abonnés au réseau, et comprenant au moins une mémoire (12) pour stocker des données, chaque port contenant une unité de transmission (2) et une unité de réception (1). Selon l'invention, chaque unité de réception (1) et chaque unité de transmission (2) comprend également une unité d'horodatage (4) et les horodatages des paquets de données entrants des unités de réception (1) et des paquets de données sortants des unités de transmission (2) générés par les unités d'horodatage (4) peuvent être stockés dans la mémoire (12). L'invention concerne également un procédé de collecte et de traitement d'informations de paquets dans ledit dispositif de réseau, dans lequel les unités d'horodatage (4) génèrent des horodatages des paquets de données entrants et sortants et les stockent dans la mémoire (12). Les données d'horodatage regroupées de cette manière peuvent être transmises aux ports à l'aide d'une génération de paquets (13) et d'une distribution de paquets (14).
EP20789054.2A 2020-02-17 2020-10-07 Dispositif de réseau et procédé de collecte et de traitement d'informations de paquet avec le dispositif de réseau Pending EP4107910A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020104098.9A DE102020104098A1 (de) 2020-02-17 2020-02-17 Netzwerkgerät sowie Verfahren zum Erfassen und Verarbeiten von Paketinformationen mit dem Netzwerkgerät
PCT/EP2020/078077 WO2021164896A1 (fr) 2020-02-17 2020-10-07 Dispositif de réseau et procédé de collecte et de traitement d'informations de paquet avec le dispositif de réseau

Publications (1)

Publication Number Publication Date
EP4107910A1 true EP4107910A1 (fr) 2022-12-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20789054.2A Pending EP4107910A1 (fr) 2020-02-17 2020-10-07 Dispositif de réseau et procédé de collecte et de traitement d'informations de paquet avec le dispositif de réseau

Country Status (5)

Country Link
US (1) US20230058383A1 (fr)
EP (1) EP4107910A1 (fr)
CN (1) CN115066870A (fr)
DE (1) DE102020104098A1 (fr)
WO (1) WO2021164896A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11973849B1 (en) * 2023-06-22 2024-04-30 Bank Of America Corporation System and method for automated data sorting in an electronic network
CN117768413A (zh) * 2023-12-26 2024-03-26 北京东土科技股份有限公司 一种ptp报文的处理方法、装置和网络设备

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7403542B1 (en) * 2002-07-19 2008-07-22 Qlogic, Corporation Method and system for processing network data packets
EP1681829A1 (fr) 2005-01-12 2006-07-19 Deutsche Thomson-Brandt Gmbh Procédé d'assignation de priorités au transfert de données dans un réseau et noeud de réseau utilisant le procédé
US9112632B2 (en) * 2008-01-25 2015-08-18 Cisco Technology, Inc. Supporting efficient and accurate sync/followup timestamps
US20120110343A1 (en) * 2010-10-29 2012-05-03 Bandic Zvonimir Z Trustworthy timestamps on data storage devices
US9736051B2 (en) * 2014-04-30 2017-08-15 Ixia Smartap arrangement and methods thereof
US9998346B2 (en) * 2015-09-25 2018-06-12 Brocade Communications Systems LLC Fabric latency determination
US10051006B2 (en) * 2016-05-05 2018-08-14 Keysight Technologies Singapore (Holdings) Pte Ltd Latency-based timeouts for concurrent security processing of network packets by multiple in-line network security tools
US10250511B2 (en) * 2016-06-10 2019-04-02 International Business Machines Corporation Persistent flow identifiers enabling disparate applications
CN109997336B (zh) * 2016-11-21 2023-02-28 赫思曼自动化控制有限公司 用于按需确定数据网络中的渡越时间的测量方法

Also Published As

Publication number Publication date
US20230058383A1 (en) 2023-02-23
WO2021164896A1 (fr) 2021-08-26
DE102020104098A1 (de) 2021-08-19
CN115066870A (zh) 2022-09-16

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