WO2005096564A1 - Method for testing routing systems - Google Patents

Method for testing routing systems Download PDF

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Publication number
WO2005096564A1
WO2005096564A1 PCT/EP2005/051420 EP2005051420W WO2005096564A1 WO 2005096564 A1 WO2005096564 A1 WO 2005096564A1 EP 2005051420 W EP2005051420 W EP 2005051420W WO 2005096564 A1 WO2005096564 A1 WO 2005096564A1
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Prior art keywords
routing
virtual test
test message
message
result
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PCT/EP2005/051420
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German (de)
French (fr)
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Thomas Hollaus
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Siemens Aktiengesellschaft
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Publication of WO2005096564A1 publication Critical patent/WO2005096564A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0062—Provisions for network management
    • H04Q3/0087—Network testing or monitoring arrangements
    • 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
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0025—Provisions for signalling
    • 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
    • H04L43/20—Arrangements for monitoring or testing data switching networks the monitoring system or the monitored elements being virtualised, abstracted or software-defined entities, e.g. SDN or NFV

Definitions

  • the invention relates to a method for testing routing systems which are used to forward messages in communication networks.
  • Routing systems control the route of 'messages through the network in communication networks. For this purpose, for each incoming message the routing tables are used to determine the further route of this message intended for this purpose on the basis of the address information contained in this message and to forward it accordingly.
  • test methods are provided with which the routing systems are tested automatically or manually off-line, i.e. The systems are tested in a separate test phase during which they are not ready for operation or they do not go through the routing functionality used in real operation during testing.
  • test methods known from the prior art e.g. Methods according to ITU-T Q.753 have the disadvantage that they only check the behavior of the routing system to a limited extent and therefore do not reliably reproduce the behavior.
  • the invention is therefore based on the object of specifying a method with which routing systems can be tested reliably and during real operation.
  • this object is achieved with a method for testing routing systems with the following method steps: a) a virtual test message is generated, b) the virtual test message is fed into the routing system via an operating element in such a way that a routing system Result is generated, c) the routing result is evaluated and then the virtual test message is rejected.
  • the method according to the invention for testing routing systems has the advantage that it can not only be used in real operation, but also leads to only a slight load on the communication network concerned.
  • a message according to signaling system no. 7 is used as the virtual test message.
  • these messages can be sent via standardized interfaces, e.g. the so-called Q3 interfaces corresponding to ITU-T Q.7xx or SNMP are fed into the routing system during live operation.
  • routing system is part of a network node. Efficient and efficient routing is essential, particularly in the case of network transitions, so that only certain defined messages are forwarded from one communication network to other communication networks.
  • the routing system is part of a so-called signaling transfer point. This is particularly because Signaling Transfer Points in the signaling system No. 7 are the No. 7 instance of the forwarding switching centers. Therefore, they do not only come as an intermediary are used within the network between two signaling points, but also particularly as switching centers at network transitions.
  • the invention is also suitable for use in signaling end points at which connections end or begin.
  • Fig. 1 shows the functional structure of a network node in which the inventive method is applied and
  • Fig. 2 shows the schematic structure of messages as they are exchanged between network nodes in communication networks.
  • the exemplary network node STPl according to FIG. 1 is a typical component of a communication network
  • the network node STPl comprises a routing system RS, which in turn contains a routing table RTB and a result stack, a so-called result stack ES. Furthermore, a stack memory ST is also contained in the exemplary network node STPl, in which messages from other network nodes of the communication network are stored for processing by the routing system RS.
  • the exemplary network node STPl includes an operator interface BS, via which the operator terminal BT used for administration of the network node STPl is connected to the network node STPl.
  • a virtual test message TN the structure of which corresponds to the structure described with reference to FIG. 2, is generated.
  • Such a message TN which, in accordance with the signaling system No. 7, message transfer part layers 2 and 3, is responsible for message distribution, routing and control of the message network, typically includes the signaling information SINFO, the field signaling
  • Link Selection SLS which is used for even load distribution on all available signaling links, the address field for the originating switching center address OPC, also referred to as originating point code, and the address field of the destination switching center DPC, also referred to as destination point code.
  • the virtual test message TN corresponding to this scheme is entered at the operator terminal BT and fed into the network node STPl via the user interface BS (arrow 1A in FIG. 1). In contrast to conventional messages, it is not stored in the stack ST, but is taken over directly by the routing system RS (arrow 1B in FIG. 1).
  • the message type is determined by means of the routing system RS and the address information contained in the address fields OPC and DPC of the virtual test message TN and the information contained in the field Signaling Link Selection SLS are evaluated.
  • a routing table RTB a routing result is then generated, which is stored in the result stack ES (arrow 2 in FIG. 1).
  • the routing result generated by the virtual test message TN can be read out via the operator interface BS (arrow 3A and arrow 3B in FIG. 1).
  • the routing result is evaluated for correctness by means of an appropriate application program. This can be done, for example, by comparing the result with stored setpoints, i.e. it is determined whether the determined further route of the message through the network corresponds to the target specifications. If this is not the case, then there is a faulty routing procedure that generally is caused by an incorrect entry in the routing table RTB. This error message is issued so that the operating personnel can make corrections accordingly.

Abstract

The invention relates to a method for testing routing systems that are used for forwarding messages in communication networks. The inventive method comprises the following steps: a) generating a virtual test message (TN), b) feeding said virtual test message (TN) via an operational element (BT) to the routing system (RS) in such a manner as to generate a routing result, c) evaluating the routing result and subsequently discard the virtual test message (TN). The advantage of the inventive method is that it can not only be used in real time operation but it also involves less burden on the affected communication network.

Description

Beschreibungdescription
Verfahren zum Testen von Routing-Systemen Die Erfindung betrifft ein Verfahren zum Testen von Routing- Systemen, die dem Weiterleiten von Nachrichten in Kommunikationsnetzen dienen.Method for testing routing systems The invention relates to a method for testing routing systems which are used to forward messages in communication networks.
Routing-Systeme steuern in Kommunikationsnetzen den Weg der ' Nachrichten durch das Netz. Dazu wird zu jeder ankommenden Nachricht anhand von Routing—Tabellen der aufgrund der in dieser Nachricht enthaltenen Ädressinformation der dafür vorgesehene weitere Weg dieser Nachricht bestimmt und diese entsprechend weitergeleitet .Routing systems control the route of 'messages through the network in communication networks. For this purpose, for each incoming message the routing tables are used to determine the further route of this message intended for this purpose on the basis of the address information contained in this message and to forward it accordingly.
Um sicherzustellen, dass die in einem Kommunikationsnetz vorhandenen Routing—Systeme die Nachrichten auch richtig weiterleiten, sind Testverfahren vorgesehen, mit denen die Routing- Systeme automatisch oder manuell off—line getestet werden, d.h. die Systeme werden in einer eigenen Testphase geprüft, während der sie nicht betriebsbereit sind oder sie durchlaufen beim Testen nicht die im Echtbetrieb eingesetzte Routingfunktionalität .In order to ensure that the routing systems present in a communication network also forward the messages correctly, test methods are provided with which the routing systems are tested automatically or manually off-line, i.e. The systems are tested in a separate test phase during which they are not ready for operation or they do not go through the routing functionality used in real operation during testing.
Die aus dem Stand der Technik bekannten Testverfahren wie z.B. Verfahren gemäß ITU—T Q.753 haben den Nachteil, dass sie das Verhalten des Routing-System nur in eingeschränktem Maße prüfen und daher nicht zuverlässig das Verhalten wiedergeben.The test methods known from the prior art, e.g. Methods according to ITU-T Q.753 have the disadvantage that they only check the behavior of the routing system to a limited extent and therefore do not reliably reproduce the behavior.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem Routing-Systeme zuverlässig und während des Echtbetriebes getestet werden können. The invention is therefore based on the object of specifying a method with which routing systems can be tested reliably and during real operation.
Ξrfindungsgemäß wird diese Aufgabe gelöst mit einem Verfahren zum Testen von Routing-Systemen mit folgenden Verfahrensschritten: a) es wird eine virtuelle Testnachricht erzeugt, b) die virtuelle Testnachricht wird über ein Bedienelement in der Weise in das Routing—System eingespeist, dass ein Routing-Ergebnis erzeugt wird, c) das Routing-Ergebnis wird ausgewertet und im Anschluss daran die virtuelle Testnachricht verworfen.According to the invention, this object is achieved with a method for testing routing systems with the following method steps: a) a virtual test message is generated, b) the virtual test message is fed into the routing system via an operating element in such a way that a routing system Result is generated, c) the routing result is evaluated and then the virtual test message is rejected.
Das erfindungsgemäße Verfahren zum Testen von Routing- Systemen hat den Vorteil, dass es nicht nur im Echtbetrieb einsetzbar ist, sondern auch zu einer nur geringen Belastung des betroffenen Kommunikationsnetzes führt.The method according to the invention for testing routing systems has the advantage that it can not only be used in real operation, but also leads to only a slight load on the communication network concerned.
Vorteilhaft ist es, wenn als virtuelle Testnachricht eine Nachricht gemäß Zeichengabesystem Nr. 7 angewendet wird. Damit können diese Nachrichten über standardisierte Schnittstellen, wie z.B. die sogenannten Q3—Schnittstellen .entspre- chend ITU—T Q.7xx oder SNMP während des Echtbetriebes in das Routing-System eingespeist werden.It is advantageous if a message according to signaling system no. 7 is used as the virtual test message. This means that these messages can be sent via standardized interfaces, e.g. the so-called Q3 interfaces corresponding to ITU-T Q.7xx or SNMP are fed into the routing system during live operation.
Günstig ist es, wenn das Routing-System Bestandteil eines Netzübergangsknotens ist. Gerade bei Netzübergängen ist rieh— tiges und effizientes Routing wesentlich, damit nur bestimmte definierte Nachrichten von einem Kommunikationsnetz in andere Kommunikationsnetze weitergeleitet werden.It is advantageous if the routing system is part of a network node. Efficient and efficient routing is essential, particularly in the case of network transitions, so that only certain defined messages are forwarded from one communication network to other communication networks.
Vorteilhaft ist es, wenn das Routing—System Bestandteil eines sogenannten Signalling Transfer Points ist. Dies insbesondere deswegen, weil Signalling Transfer Points im Zeichengabesystem Nr.7 die Nr.7-Instanz der weiterleitenden Vermittlungsstellen sind. Sie kommen daher nicht nur als Vermittlungs- stellen innerhalb des Netzes zwischen zwei Signalisierungs— punkten, sondern auch besonders als Vermittlungsstellen an Netzübergängen zum Einsatz.It is advantageous if the routing system is part of a so-called signaling transfer point. This is particularly because Signaling Transfer Points in the signaling system No. 7 are the No. 7 instance of the forwarding switching centers. Therefore, they do not only come as an intermediary are used within the network between two signaling points, but also particularly as switching centers at network transitions.
Grundsätzlich ist die Erfindung aber auch für den Einsatz in Signalling End Points geeignet, an denen Verbindungen enden oder beginnen .In principle, however, the invention is also suitable for use in signaling end points at which connections end or begin.
Die Erfindung wird anhand von Figuren näher erläutert. Diese zeigen beispielhaft:The invention is explained in more detail with reference to figures. These show an example:
Fig. 1 den funktionellen Aufbau eines Netzknotens, in dem das erfindungsgemäße Verfahren angewendet wird undFig. 1 shows the functional structure of a network node in which the inventive method is applied and
Fig. 2 den schematischen Aufbau von Nachrichten wie sie zwischen Netzknoten in Kommunikationsnetzen ausgetauscht werden.Fig. 2 shows the schematic structure of messages as they are exchanged between network nodes in communication networks.
Der beispielhafte Netzknoten STPl gemäß Fig.l ist ein typi- scher Bestandteil eines Kommunikationsnetzes entsprechendThe exemplary network node STPl according to FIG. 1 is a typical component of a communication network
Zeichengabesystem Nr. 7 und ist dort eine weiterleitende Vermittlungsstelle. Der Netzknoten STPl umfasst ein Routing - System RS, welches wiederum eine Routingtabelle RTB und einen Ergebnisstapelspeicher einen sogenannten Ergebnisstack ES enthält. Weiterhin ist im beispielhaften Netzknoten STPl auch ein Stapelspeicher ST enthalten, in dem Nachrichten von anderen Netzknoten des Kommunikationsnetzes für die Verarbeitung durch das Routing—System RS abgelegt werden. Außerdem umfasst der beispielhafte Netzknoten STPl eine Bedienschnittstelle BS, über die das zur Administration des Netzknoten STPl verwendete Bedienterminal BT an den Netzknoten STPl angeschlossen ist.Signaling system No. 7 and there is a forwarding exchange. The network node STPl comprises a routing system RS, which in turn contains a routing table RTB and a result stack, a so-called result stack ES. Furthermore, a stack memory ST is also contained in the exemplary network node STPl, in which messages from other network nodes of the communication network are stored for processing by the routing system RS. In addition, the exemplary network node STPl includes an operator interface BS, via which the operator terminal BT used for administration of the network node STPl is connected to the network node STPl.
Der Ablauf des erfindungsgemäßen Verfahren ist bei dem Aus- führungsbeispiel wie folgt: Beim ersten Schritt des Verfahrens zum Testen von Routing- Systemen wird eine virtuelle Testnachricht TN, die in ihrem Aufbau der anhand der Figur 2 beschriebenen Struktur entspricht, generiert.The sequence of the method according to the invention is as follows in the exemplary embodiment: In the first step of the method for testing routing systems, a virtual test message TN, the structure of which corresponds to the structure described with reference to FIG. 2, is generated.
Eine solche Nachricht TN, die entsprechend dem Zeichengabe— System Nr.7 Nachrichtentransferteil Schichten 2 und 3 die Nachrichtenverteilung, Nachrichtenweglenkung und Steuerung des Zeigengabenetzes zur Aufgabe hat, umfaßt typischerweise die Signalisierungsinformation SINFO, das Feld SignallingSuch a message TN, which, in accordance with the signaling system No. 7, message transfer part layers 2 and 3, is responsible for message distribution, routing and control of the message network, typically includes the signaling information SINFO, the field signaling
Link Selection SLS, das der gleichmäßigen Lastverteilung auf allen verfügbaren Signalisierungsstrecken dient, das Adressfeld für die Ursprungsvermittlungs—stellenadresse OPC, auch als Originating Point Code bezeichnet, und das Adressfeld der Zielvermittlungsstelle DPC, auch als Destination Point Code bezeichnet.Link Selection SLS, which is used for even load distribution on all available signaling links, the address field for the originating switching center address OPC, also referred to as originating point code, and the address field of the destination switching center DPC, also referred to as destination point code.
Die diesem Schema entsprechende virtuelle Testnachricht TN wird am Bedienterminal BT eingegeben und über die Bedien- schnittstelle BS in den Netzknoten STPl eingespeist (Pfeil 1A in Fig.l) . Sie wird im Gegensatz zu herkömmlichen Nachrichten nicht im Stapelspeicher ST abgelegt, sondern direkt vom Routing—System RS übernommen (Pfeil 1B in Fig.l) . Mittels Routing-System RS wird der Nachrichtentyp ermittelt und die in den Adressfeldern OPC und DPC der virtuellen Testnachricht TN enthaltene Adressinformationen, sowie die in dem Feld Signalling Link Selection SLS enthaltene Information ausgewertet. Mit Hilfe einer Routing-Tabelle RTB wird dann ein Routing- Ergebnis erzeugt, das im Ergebnisstack ES abgelegt wird (Pfeil 2 in Fig.l) . Mit dem Bedienterminal BT kann über die Bedienschnittstelle BS das durch die virtuelle Testnachricht TN erzeugte Routing-Ergebnis ausgelesen werden (Pfeil 3A und Pfeil 3B in Fig.l) .The virtual test message TN corresponding to this scheme is entered at the operator terminal BT and fed into the network node STPl via the user interface BS (arrow 1A in FIG. 1). In contrast to conventional messages, it is not stored in the stack ST, but is taken over directly by the routing system RS (arrow 1B in FIG. 1). The message type is determined by means of the routing system RS and the address information contained in the address fields OPC and DPC of the virtual test message TN and the information contained in the field Signaling Link Selection SLS are evaluated. With the help of a routing table RTB, a routing result is then generated, which is stored in the result stack ES (arrow 2 in FIG. 1). Using the operator terminal BT, the routing result generated by the virtual test message TN can be read out via the operator interface BS (arrow 3A and arrow 3B in FIG. 1).
Im Unterschied zur Weiterbehandlung von realen NachrichtenIn contrast to the further processing of real messages
(Pfeil 5 in Fig.l), die von anderen Netzknoten STP2 gesendet wurden und im Stapelspeicher ST zwischengespeichert (Pfeil 4A in Fig.l) und vom Stapelspeicher an das Routing—System RS weitergeleitet werden (Pfeil 4B in Fig.l), wird die virtuelle Testnachricht TN vom beispielhaften Netzknoten STPl nach der Bearbeitung verworfen.(Arrow 5 in Fig.l), which were sent from other network nodes STP2 and buffered in the stack ST (arrow 4A in Fig.l) and from the stack to the routing system RS (arrow 4B in Fig.l), the virtual test message TN is rejected by the exemplary network node STPl after processing.
Das Routing-Ergebnis wird hingegen mittels entsprechendem Anwendungsprogramm hinsichtlich seiner Richtigkeit ausgewertet. Dies kann beispielsweise dadurch geschehen, dass das Ergebnis mit gespeicherten Sollwerten verglichen wird, d.h. es wird festgestellt, ob der ermittelte weitere Weg der Nachricht durch das Netz den Sollvorgaben entspricht. Wenn dies nicht der Fall ist, dann liegt eine fehlerhafte Routing— Prozedur vor, die i.A. einen fehlerhaften Eintrag in der Routing- Tabelle RTB als Ursache hat. Diese Fehlermeldung wird ausge- geben, sodass das Bedienpersonal entsprechende Korrekturen vornehmen kann . The routing result, on the other hand, is evaluated for correctness by means of an appropriate application program. This can be done, for example, by comparing the result with stored setpoints, i.e. it is determined whether the determined further route of the message through the network corresponds to the target specifications. If this is not the case, then there is a faulty routing procedure that generally is caused by an incorrect entry in the routing table RTB. This error message is issued so that the operating personnel can make corrections accordingly.

Claims

Patentansprüche claims
1. Verfahren zum Testen von Routing—Systemen, die dem Weiterleiten von Nachrichten in Kommunikationsnetzen dienen, mit folgenden Verfahrensschritten: d) es wird eine virtuelle Testnachricht (TN) erzeugt, e) die virtuelle Testnachricht (TN) wird über ein Bedienelement (BT) in der Weise in das Routing—System (RS) eingespeist, dass ein Routing-Ergebnis erzeugt wird, f) das Routing-E gebnis wird ausgewertet und im Anschluss daran die virtuelle Testnachricht (TN) verworfen.1. Method for testing routing systems which serve to forward messages in communication networks, with the following method steps: d) a virtual test message (TN) is generated, e) the virtual test message (TN) is generated via an operating element (BT) fed into the routing system (RS) in such a way that a routing result is generated, f) the routing result is evaluated and then the virtual test message (TN) is rejected.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als virtuelle Testnachricht (TN) eine Nachricht gemäß Zeichengabesystem Nr. 7 angewendet wird.2. The method according to claim 1, characterized in that a message according to signaling system no. 7 is used as the virtual test message (TN).
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Routing-System (RS) Bestandteil eines Netzübergangsknotens ist.3. The method according to claim 1, characterized in that the routing system (RS) is part of a network node.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Routing-System (RS) Bestandteil eines Signalling Transfer Points (STPl) ist. 4. The method according to claim 3, characterized in that the routing system (RS) is part of a signaling transfer point (STPl).
PCT/EP2005/051420 2004-03-30 2005-03-29 Method for testing routing systems WO2005096564A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1760939A1 (en) 2005-08-29 2007-03-07 Denso Corporation Fault diagnosis in data table of network node
WO2008000129A1 (en) * 2006-06-23 2008-01-03 Huawei Technologies Co., Ltd. A method and device for providing test routes and a routing test system
WO2009043745A1 (en) * 2007-10-05 2009-04-09 International Business Machines Corporation Router detection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5583848A (en) * 1994-11-15 1996-12-10 Telefonaktiebolaget L M Ericsson Methods for verification of routing table information
US6158031A (en) * 1998-09-08 2000-12-05 Lucent Technologies, Inc. Automated code generating translator for testing telecommunication system devices and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5638357A (en) * 1995-08-25 1997-06-10 Telefonaktiebolaget Lm Ericsson (Publ) Distributed method for periodical routing verification test scheduling
US5864563A (en) * 1996-07-15 1999-01-26 At&T Corp Method for testing network
US6295351B1 (en) * 1998-04-23 2001-09-25 Bellsouth Intellectual Propety Corporation System and method for invocation of a check of a telecommunications application through use of a call probe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5583848A (en) * 1994-11-15 1996-12-10 Telefonaktiebolaget L M Ericsson Methods for verification of routing table information
US6158031A (en) * 1998-09-08 2000-12-05 Lucent Technologies, Inc. Automated code generating translator for testing telecommunication system devices and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Signalling System 7 management functions MRVT, SRVT and CVT and definition for the OMASE-user", ITU-T Q.753, 1 June 1997 (1997-06-01), XP002335187 *
GLITHO R H: "ISOLATING FAULTY ROUTING TABLES IN SS7 NETWORKS: PRESENT AND FUTURE", IEEE COMMUNICATIONS MAGAZINE, IEEE SERVICE CENTER. PISCATAWAY, N.J, US, vol. 34, no. 5, May 1996 (1996-05-01), pages 98 - 104, XP000574146, ISSN: 0163-6804 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1760939A1 (en) 2005-08-29 2007-03-07 Denso Corporation Fault diagnosis in data table of network node
US7689882B2 (en) 2005-08-29 2010-03-30 Denso Corporation Fault diagnosis in relaying data among a plurality of networks
WO2008000129A1 (en) * 2006-06-23 2008-01-03 Huawei Technologies Co., Ltd. A method and device for providing test routes and a routing test system
WO2009043745A1 (en) * 2007-10-05 2009-04-09 International Business Machines Corporation Router detection

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