EP1256257A1 - Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls - Google Patents

Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls

Info

Publication number
EP1256257A1
EP1256257A1 EP01909618A EP01909618A EP1256257A1 EP 1256257 A1 EP1256257 A1 EP 1256257A1 EP 01909618 A EP01909618 A EP 01909618A EP 01909618 A EP01909618 A EP 01909618A EP 1256257 A1 EP1256257 A1 EP 1256257A1
Authority
EP
European Patent Office
Prior art keywords
switching
mpls
devices
equivalent
connections
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.)
Withdrawn
Application number
EP01909618A
Other languages
German (de)
English (en)
Inventor
Joachim Klink
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP01909618A priority Critical patent/EP1256257A1/fr
Publication of EP1256257A1 publication Critical patent/EP1256257A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections

Definitions

  • the invention relates to a method according to the preamble of patent claim 1.
  • This known method relates to transmission devices via which information is routed according to an asynchronous transfer mode (ATM).
  • ATM asynchronous transfer mode
  • a transmission device is provided for the bidirectional transmission of digital signals, in which two switching devices functioning as end points are connected to one another via an operating path and a replacement path.
  • the two end points each contain a monitoring device for the detection of transmission disorders.
  • a switching device that can be controlled by the monitoring device connects a receiving device m a first switching state to the operating path and m a second switching state to the replacement path.
  • a disadvantage of this known method is that it relates exclusively to ATM transmission devices.
  • Information about a plurality of network nodes which can be designed as routers, is supplied to the receiving subscriber on the Internet.
  • MPLS networks can be arranged between the routers. MPLS networks are not addressed in the known method.
  • the invention has for its object to develop a method of the type mentioned in such a way that ternet information can be transmitted with great security over a plurality of network nodes.
  • An advantage of the invention is particularly that the MPLS packets are also routed via the protection link, and that in the Storungsfall on the working link via the He set range ⁇ ge between the two switching centers ⁇ initiated MPLS packets in accordance with P ⁇ oritatskrite ⁇ en, by means of which at The simultaneous occurrence of several equivalent switching requests determines which criterion has the highest priority, is recorded and transmitted by logical connection information contained in the packet header of the MPLS packets and is fed to the other devices in the MPLS network.
  • This has the advantage that the connection can be maintained in the event of an error.
  • the provision of one or more packet headers that are added to the IP packet in the MPLS network does not constitute a restriction.
  • FIG. 1 shows an MPLS network integrated in the Internet
  • FIG. 2 shows the method according to the invention for the transmission of MPLS packets in a 1 + 1 structure
  • FIG. 3 shows the priorities used, according to which the equivalent circuit takes place.
  • FIG. 1 is shown an example of how information to a subscriber TLN 2 are led to ⁇ ⁇ from going from a subscriber TLN 1.
  • the transmitting party TLN1 is connected to the I nternet IP network through which the information is for an Internet protocol such as the IP protocol ge ⁇ passes. This protocol is not a connection-oriented protocol.
  • the Internet network IP has a plurality of routers R, which can be meshed with one another.
  • the receiving subscriber TLN2 is connected to a further Internet network IP.
  • MPLS network Multiprotocol Packet Label Switching
  • MPLS packets are switched through comparable bmdungsorientiert through the information form of m.
  • This network has a plurality of routers meshed with one another. In an MPLS network, these can be so-called label switched routers (LSR).
  • LSR label switched routers
  • One of the routers is referred to as the sending device W and another as the receiving device E.
  • MPLS packets each have a header and an information section.
  • the head part is used to record connection information while the information point is used to record useful information.
  • IP packets are used as useful information.
  • the connection information contained in the header is designed as an MPLS connection number. However, this is only valid in the MPLS network. If an IP packet from the Internet network IP m thus penetrates the MPLS network, the header that is valid in the MPLS network is appended to it. This contains all connection information that specifies the path of the MPLS packet in the MPLS network. If the MPLS packet leaves the MPLS network, the head part is removed again and the IP packet is routed further in the subsequent Internet network IP in accordance with the IP protocol.
  • FIG. 2 The structure of the MPLS network is shown in more detail in FIG.
  • Two nodes of an MPLS network are disclosed here by way of example. This is a unidirectional 1 + 1 structure. Both nodes represent switching equipment, and are designed as routers (Label Switched Routers, LSR) W, E ⁇ . In the present exemplary embodiment is gone away from ⁇ that it nect these routers to MPLS Cross Con is switching equipment. However, the use of routers designed in this way does not limit the invention, other switching devices such as. B. ATM switching devices can also be used.
  • MPLS packets multiprotocol label switched packets
  • MPLS packets are now to be transmitted from the label switched router W to the label switched router E. According to the definition, reverse direction is not provided for MPLS networks.
  • the label switched routers W, E are connected to one another via an operating link WE (WORKING ENTITY) and a replacement link PE (PROTECTION ENTITY).
  • a switching device S (BRIDGE) is shown on the transmission side, via which MPLS packets arriving in the label switched router W are duplicated and transmitted to the label switched router E both via the associated operating route WE and the replacement route PE.
  • the replacement route PE thus serves as a replacement path for the MPLS packets carried over the operating route WE. Setting up the replacement path is optional.
  • a selection device SN is disclosed in the receiving label switched router E, the function of which is to feed the MPLS packets transmitted over the operating path WE to the output of the label switched router E.
  • Monitoring devices UE 0 , UEi PROTECTION DOMAIN SINK, PROTECTION DOMAIN SOURCE
  • the monitoring devices UE 0 , UE X are likewise arranged in the label switched router W on the transmission side.
  • MPLS packets can be loaded with control information UE x of the label switched router W before they are transmitted over the operating link WE to the label switched router E hm.
  • This Control information carried is then taken and checked on the receiving side by the monitoring device ÜEi of the receiving label switched router E. Based on this control information, z. B. be determined whether the Ü transmission of the MPLS packet has been correctly or not.
  • a possible total failure (SIGNAL FAIL FOR WORKING ENTITY) of the operating route WE can be determined here.
  • SIGNAL DEGRADE Ver ⁇ going deterioration in the transmission quality
  • Central control devices ZST are also arranged in each label switched router W, E. These each contain priority tables PL. These are local priority tables, in which the status and priority of the local label switched router are stored. By introducing the priorities, it is achieved that, when several equivalent switching requests occur at the same time, it is determined which equivalent switching request is to be used with priority. For example, there is a high-pore requirement from a user. Since this equivalent switching request is assigned a high priority, it is therefore preferably controlled. Another low priority equivalent switching request is therefore rejected.
  • the individual priorities are shown in a table in FIG. 3.
  • each MPLS connection is individually monitored and individually replaced. Failures and disruptions can therefore be considered individually.
  • the MPLS packets are transferred from the label switched router W to the label switched router E via the loading transmission line WE and the replacement line PE transmitted. To n ⁇ ä waxed the operating link WE is still intact and the MPLS Pa ⁇ kete be also properly supplied to the receiving label switched router E.
  • the MPLS packets belong to one or several older compounds which physically driven over the same route Be ⁇ WE can be guided and which each have a replacement ⁇ path (optional) via the protection link PE.
  • the individual connections are differentiated based on the logical MPLS connection number entered in the header of the MPLS packets.
  • the switching device S of the label switched router W dupli ⁇ decorates the incoming MPLS packets and passes them to Uoerwachungs wornen UE 0, UE ⁇ .
  • the MPLS packets are loaded with the control information already mentioned and are fed to the receiving label Switched Router E via the operating link WE and the replacement link PE.
  • the monitoring devices UE, UE are arranged on the input side.
  • the control information carried is now checked, whereupon an error is determined if necessary. If the transmission has been carried out correctly, the MPLS packets are fed to a switching network SN.
  • the switching device SN of the label switched router E m controls the remaining operating state, as shown in FIG. 1.
  • the conducted via the protection link PE MPLS packets are received and supplied to the switching network SN, the Be ⁇ drive link WE is taken out of operation.
  • Emzel connections can be monitored and switched using a single equivalent switching connection in order to be able to react appropriately to the most common error cases occurring in practical operation. Furthermore, only an equivalent switching protocol m is entered in the priority table PL.
  • the operating and replacement lines WE and PE must be set up before commissioning. For this purpose, connections must be set up (configured) between the label switched routers W and E and, if appropriate, on intermediate transmission devices (not shown in FIG. 3).
  • connections are usually set up using TMN (Telecommunications Network Management), but can also be done using an MPLS signaling protocol.
  • TMN Telecommunications Network Management
  • MPLS MPLS signaling protocol
  • the route of the operating or replacement route is determined by signaling.
  • bandwidth m is reserved for the transmission devices via the signaling protocol, so that the transmission of the information via the operating or replacement route is ensured.

Abstract

Dans l'état actuel de la technique, la commutation de remplacement pour les paquets transmis par commutation par étiquette multi-protocole (MPLS) pose le problème des erreurs de couplage. La présente invention apporte une solution par le fait qu'en cas de perturbation sur une ligne de service, une commutation de remplacement est commandée sur une seule section de remplacement, en fonction de critères de priorité et d'informations de communication logiques.
EP01909618A 2000-02-15 2001-01-12 Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls Withdrawn EP1256257A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01909618A EP1256257A1 (fr) 2000-02-15 2001-01-12 Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP00103082 2000-02-15
EP00103082A EP1126741A1 (fr) 2000-02-15 2000-02-15 Méthode de commutation de protection des dispositifs de transmission dans des réseaux MPLS
PCT/EP2001/000340 WO2001062037A1 (fr) 2000-02-15 2001-01-12 Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls
EP01909618A EP1256257A1 (fr) 2000-02-15 2001-01-12 Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls

Publications (1)

Publication Number Publication Date
EP1256257A1 true EP1256257A1 (fr) 2002-11-13

Family

ID=8167859

Family Applications (2)

Application Number Title Priority Date Filing Date
EP00103082A Withdrawn EP1126741A1 (fr) 2000-02-15 2000-02-15 Méthode de commutation de protection des dispositifs de transmission dans des réseaux MPLS
EP01909618A Withdrawn EP1256257A1 (fr) 2000-02-15 2001-01-12 Procede de commutation de remplacement de dispositifs de transmission dans les reseaux mpls

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP00103082A Withdrawn EP1126741A1 (fr) 2000-02-15 2000-02-15 Méthode de commutation de protection des dispositifs de transmission dans des réseaux MPLS

Country Status (6)

Country Link
US (1) US20030063561A1 (fr)
EP (2) EP1126741A1 (fr)
CN (1) CN1401200A (fr)
AU (1) AU767793B2 (fr)
CA (1) CA2399983A1 (fr)
WO (1) WO2001062037A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001020829A1 (fr) * 1999-09-14 2001-03-22 Megaxess, Inc. Procede et appareil de prevention d'encombrements dans des reseaux atm au moyen de la commutation de protection atm
CN100353716C (zh) * 2003-01-22 2007-12-05 华为技术有限公司 一种建立和删除分叉标记交换路径的方法
US10833975B2 (en) * 2018-11-02 2020-11-10 Cisco Technology, Inc. Operations processing of multiple-protocol packets by packet switching devices in a network

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EP0545932B1 (fr) * 1990-08-31 1998-07-22 Bell Communications Research, Inc. Reseau maille autoreparateur utilisant des structures annulaires logiques
DE59205923D1 (de) * 1991-01-23 1996-05-15 Siemens Ag Verfahren zur Ersatzschaltung eines Datenstroms
WO1994028646A1 (fr) * 1993-05-28 1994-12-08 Siemens Aktiengesellschaft Procede permettant de realiser un circuit equivalent pour un dispositif de transmission destine a la transmission bidirectionnelle de signaux numeriques et configuration de mise en ×uvre dudit procede
JPH08195756A (ja) * 1994-11-15 1996-07-30 Fujitsu Ltd 二重化伝送装置の回線保護切替えシステム
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CA2164071C (fr) * 1995-09-06 2001-08-21 Thomas P. J. Flanagan Systeme de communication optique
DE19646016C2 (de) * 1996-11-07 1999-10-14 Siemens Ag Verfahren zum Ersatzschalten von Übertragungseinrichtungen zur bidirektionalen Übertragung von ATM-Zellen
DE19703992A1 (de) * 1997-02-03 1998-08-06 Siemens Ag Verfahren zum Ersatzschalten von Übertragungseinrichtungen in Ringarchitekturen zur bidirektionalen Übertragung von ATM-Zellen
US6925054B1 (en) * 1998-12-07 2005-08-02 Nortel Networks Limited Network path protection
US6721269B2 (en) * 1999-05-25 2004-04-13 Lucent Technologies, Inc. Apparatus and method for internet protocol flow ring protection switching
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EP1130853A1 (fr) * 2000-02-29 2001-09-05 Siemens Aktiengesellschaft Dispositif de circuit pour la commutation de substitution d' installations de transmission dans des architectures d' anneau avec des paquets de MPLS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LE FAUCHEUR F.: "IETF Multiprotocol Label Switching (MPLS) Arhitecture", PROCEEDINGS OF ICATM'98: IEEE INTERNATIONAL CONFERENCE ON ATM, 22 June 1998 (1998-06-22), COLMAR FRANCE, pages 6 - 15, XP000977411, DOI: doi:10.1109/ICATM.1998.688153 *

Also Published As

Publication number Publication date
US20030063561A1 (en) 2003-04-03
EP1126741A1 (fr) 2001-08-22
AU767793B2 (en) 2003-11-27
CA2399983A1 (fr) 2001-08-23
CN1401200A (zh) 2003-03-05
AU3729601A (en) 2001-08-27
WO2001062037A1 (fr) 2001-08-23

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