EP1260064A2 - Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls) - Google Patents

Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls)

Info

Publication number
EP1260064A2
EP1260064A2 EP01923544A EP01923544A EP1260064A2 EP 1260064 A2 EP1260064 A2 EP 1260064A2 EP 01923544 A EP01923544 A EP 01923544A EP 01923544 A EP01923544 A EP 01923544A EP 1260064 A2 EP1260064 A2 EP 1260064A2
Authority
EP
European Patent Office
Prior art keywords
switching
mpls
circuit arrangement
route
arrangement according
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Withdrawn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
EP01923544A
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.)
Nokia Solutions and Networks SpA
Original Assignee
Siemens AG
Nokia Solutions and Networks SpA
Siemens Corp
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, Nokia Solutions and Networks SpA, Siemens Corp filed Critical Siemens AG
Priority to EP01923544A priority Critical patent/EP1260064A2/fr
Publication of EP1260064A2 publication Critical patent/EP1260064A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665—Interaction of ATM with other protocols

Definitions

  • the invention relates to a circuit arrangement according to the preamble of claim 1.
  • This known circuit arrangement relates to transmission devices via which information is routed according to an asynchronous transfer mode (ATM).
  • ATM asynchronous transfer mode
  • a transmission device for bidirectional transmission of digital signals is provided, in which two switching devices functioning as end points are connected to one another via a plurality of operating lines and a replacement line.
  • the two end stations each contain monitoring devices for detecting transmission faults.
  • a switching device controllable by a monitoring device connects a receiving device in a first switching state to the operating path and in a second switching state to the replacement path.
  • a disadvantage of this known circuit arrangement is that it relates exclusively to ATM transmission devices.
  • On the Internet information about a plurality of network nodes, which can be designed as routers, is supplied to the receiving subscriber.
  • MPLS networks can be arranged between the routers. MPLS networks are not addressed at all in the known circuit arrangement.
  • the invention has for its object to develop a circuit arrangement of the type mentioned in such a way that information transmitted according to an Internet protocol can be transmitted with great certainty over a plurality of network nodes .
  • An advantage of the invention is especially that a multi ⁇ MPLS switches li--linear Ubertragungsabêten formed are joined together to form a ring system of paying out.
  • a transmission section is formed by an operating route and / or a replacement route.
  • two opposing unidirectional MPLS connections are logically associated with one another, each of which connects the same MPLS switching devices, with the operating link and replacement link being routed via different physical paths.
  • the MPLS switching devices are designed as label switched routers. This has the advantage that MPLS connections can be maintained in an efficient manner in the event of a malfunction of the operating link in ring systems developed in this way.
  • FIG. 2 shows a configuration for the transmission of MPLS packets in a linear 1 + 1 structure
  • FIG. 3 shows a configuration for the transmission of MPLS packets in a linear 1: 1 structure
  • FIG. 4 shows the circuit arrangement according to the invention
  • FIG. 1 is shown an example of how information to a subscriber TLN 2 are leads to ⁇ ⁇ Found ü from going from a subscriber TLN 1.
  • the sending subscriber TLN1 is connected to the Internet network IP, through which the information is routed according to an Internet protocol, such as the IP protocol. This protocol is not an association-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.
  • An MPLS network Multiprotocol Packet Label Switchmg
  • This network has a plurality of routers meshed with one another. In an MPLS network, these can be so-called label switched routers (LSR).
  • One of the routers is referred to as the sending device W and another as the receiving device E.
  • MPLS packages each have a header and an information point.
  • the head part is used to record connection information, while the information part 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 thus penetrates the MPLS network, the header that is valid in the MPLS network is appended to it. Then all connection information is contained that specify the path of the MPLS packet in the MPLS network. If the MPLS packet leaves the MPLS network, the header is removed again and the IP packet is routed on in the subsequent Internet network IP in accordance with the IP protocol. In FIG.
  • FIG. 2 now are MPLS packets (Multi Protocol La ⁇ bel Switched packets) are transmitted from the designed as label switched routers W switching means to the designed as a Label Switched Router E switch back.
  • MPLS packets Multi Protocol La ⁇ bel Switched packets
  • Fig. 2 shows a linear 1 + 1 structure.
  • a bidirectional transmission case is also shown here.
  • the transmission of MPLS packets in the MPLS network is defined unidirectionally. Accordingly, in the bidirectional transmission case for the forward and backward transmission of a connection WT associated MPLS packets between the label switched router W and the label switched router E, a total of 2 "connections (one for the execution and one for the reverse direction) must be established.
  • a “connection * in the MPLS network is called a label switched path (LSP).
  • LSP label switched path
  • 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).
  • the operating route WE can optionally also be formed from a plurality of operating routes.
  • Switching devices S (BRIDGE) are also shown, via which the incoming MPLS packets are received and the operating lines WE are transmitted to the label switched router E hm.
  • Fig. 2 can also be found selection devices SN, the task of which is that of the
  • the selection devices SN are designed as a switching matrix.
  • the switching network SN is both assigns the label S witched router W as being in the label switched router E ⁇ .
  • W eiterhin are shown in two label switched routers W, E surveil ⁇ monitoring devices UE o UEi (PROTECTION DOMAIN SINK, PROTECTION DOMAIN SOURCE) that monitor packages the state or the quality of the data transmitted via the service links WE MPLS.
  • E surveil ⁇ monitoring devices UE o UEi PROTECTION DOMAIN SINK, PROTECTION DOMAIN SOURCE
  • the MPLS packets of the connection with the number 1 WTi before they are transmitted over the operating route WE to the label switched router E hm, are loaded with control information by the monitoring device UEi of the label switched router W which the monitoring device UEi of the receiving one Label Switched Router E removes and checks.
  • This control information can then be used to determine whether the MPLS packet has been transmitted correctly or not.
  • a total failure (SIGNAL FAIL FOR WORKING ENTITY) of the operating route WE can be determined.
  • deteriorations in the transmission quality SIGNAL DEGRADE
  • the monitoring devices UEi close the operating route WE on both sides. Further monitoring devices UEo are arranged on both ends of the replacement route PE. In the event of a fault, this should serve as a transmission link for the decommissioned operating link WE. Furthermore, substitute switching protocols ES are transmitted, so that the integrity of the substitute route has top priority.
  • Central control devices ZST are also arranged in each of the label switched routers W, E. These each contain local and global priority tables, in which the state and priority of the local label switched router W (local priority table) as well as the state and priority of the local and be performed of the remaining label switched router E (global Priori ⁇ turgistabelle). Activities by the introduction of Priori ⁇ is achieved that several upon the concurrence ⁇ rer protection switching requests is determined which operating range in case of the presence of several operating stretch is spare switch.
  • the equivalent switching requests are also prioritized in the priority tables. For example, there is a high priority requirement from a user. Since this equivalent switching request is assigned a high priority, it is therefore preferably controlled.
  • the central control devices ZST of the label switched router W, E exchange information in an equivalent switching protocol ES.
  • This protocol is transmitted over the substitute route PE and taken from the assigned monitoring device ÜE 0 of the respective label switched router that is received, and fed to the relevant central control device ZST. Furthermore, care is taken in the central control device ZST that the switching devices S are actuated in a corresponding manner in the event of a fault.
  • K 2nd The first is information relating to the generated equivalent switching request, while the latter is information relating to the current states of the switching devices.
  • the protocol ES is exchanged between the two label switched routers W, E when an equivalent switching request is generated.
  • a special embodiment of the invention provides for the protocol ES to be transmitted cyclically between the two label switched routers W, E.
  • FIG. 3 shows a further linear structure with which MPLS packets can be switched in replacement.
  • This is a 1: 1 structure.
  • the difference to that in Fig. 2 shown 1 + 1 structure is that the bridge devices S shown there are designed as switching devices So , S i.
  • the selection device SN is also here designed as a coupling box, as shown in Fig. 2.
  • the UE he b the protection link PE forwarded MPLS packets are supplied to the switching network ⁇ sem.
  • the logical MPLS connection number is now taken from the packet header, evaluated and switched through the switching matrix. The activation of switching devices is therefore not necessary in the receiving switch. .
  • Swit ⁇ ched routers W E of Figure 3 are as - did not show up ⁇ - include central control means with local and global priority tables.
  • the replacement route PE can remain unused during this time. If necessary, special data (EXTRA TRAFFIC) can also be supplied to the label switched routers E during this time.
  • EXTRA TRAFFIC special data
  • the protocol ES is designed here in a different way than in the first case. So, in addition to the information already mentioned in the first case, further information is stored here with respect to the generated equivalent switching request. This is information relating to the current states of the switching devices S 0 , S ⁇ . In the event of a fault, the switching devices S 0 , Si must be controlled in a corresponding manner.
  • the protocol is exchanged between the two label switched routers W, E when the equivalent switching request is generated.
  • a special embodiment of the invention provides for the protocol ES to be transmitted cyclically between the two label switched routers W, E.
  • FIG. 4 The circuit arrangement according to the invention is shown in FIG. 4 (dedicated protection).
  • Dedicated protection means that the bandwidth per MPLS switched path is fixed both on the operating route WE and on the replacement route PE. is served.
  • the label switched routers are switched so that there is a closed ring.
  • this ring is to be made up of linear connecting sections, as shown in FIG. 2 or 3.
  • Fig. 4 ⁇ be written exemplary embodiment of the ring is from the m Fig. 2 indicated linear 1 + 1 structure can be formed without this being a preference for this structure is to be indicated.
  • label switched routers N A , N B , N c and N D on ⁇ Two label switched routers each terminate transmission sections. Using the example of the label switched routers N A and N D , these are the connection sections WE A -D_ SO- and WE D _ A. Using the example of the label switched routers N A and N B or N B , N c or N c , N D , these are the connection sections PEA-D and PE D _ A.
  • each of these label switched routers has a bridge device S and a selection device SN.
  • the label switched routers should be switched in such a way that the respectively active operating lines WE A - D _ and WE D _ A are arranged between the label switched routers N A and N D.
  • the MPLS packets arriving via the connection WT A -E_ and WT D - A are then routed via these operating routes.
  • the spare routes are, however, directed by the label switched router N A via further label switched routers N B, N c to the label switched router N D. There the MPLS packets leave the ring for further equipment.
  • the ring FIG. 4 formed by the label switched router is also bidirectional.
  • the reverse direction of the connection WT A - D is formed by the connection WT D _ A.
  • both connections are treated separately, even though it is a bidirectional connection. It is essential that exactly one replacement route is assigned to the respective operating route is.
  • S omit the operating link WE A _ D _the standby link PE A _ D and functions as a reverse direction operation range D WE -A is the standby link PE D - A assigned.
  • Ausgestal ⁇ processing disclosed in FIG. 4 configuration a transmission case unidi- retechnischaler possible.
  • a protection switching protocol is only he entered local priority table in d. This has the V orteil that the protection switching protocol in case of failure of a working link is to transmit only once. This assumes d Avon that a protection switching protocol would otherwise be transmitted per MPLS path number. However, this would result due to the large number of MPLS connections to dy namic ⁇ load of the ring.
  • a logical bundling of the MPLS connection number is advantageous to a logical group number.
  • the compound WT A - D requires that the associated MPLS packets over the label switched router N A ring are supplied via the label switched router N D leave same.
  • the compound A WT thus be - D supplied to the associated MPLS packets of the label switched router arranged in N A S bridge means. Since this is permanently set, the MPLS packets are forwarded to the Label Switched Router [both via the operating link WE A _ n and via the replacement link PE A _ D and leave the ring there.
  • the MPLS packets are routed directly from the label switched router N A to the label switched router N D.
  • this is determined by the monitoring device arranged in the receiving label switched router. In the present case, this should be the label switched router N D.
  • the equivalent switching protocol is immediately supplied by the latter via the assigned alternative route PE A - D to the sending label switched router, that is to say the label switched router N A.
  • the selection device SN controlled in the operating state that accepts MPLS packets over the replacement route PE A - D.
  • the monitoring devices also check the operating condition on the replacement routes. For example, MPLS packets transmitted via the operating link WE A _ D and is now on the receiving label switched router, so the label switched router N ⁇ a Storungsfall on the assigned He set distance ⁇ PE A - determined D, then it will be in Experimentalschalte- Protocol filed information communicated this to the transmitting label switched routers N A. This prevents that in the event of an additional fault on the active operating link WE A - D, a switchover to a faulty replacement link PE A - D takes place.
  • the equivalent switching protocol ES is only exchanged when faults occur, but a cyclical exchange can also be controlled.
  • the replacement switching protocol can be changed individually for each MPLS connection number. However, it must be taken into account that in these cases there is a dynamic additional load on the ring. However, it is advantageous here that connection-specific interference with regard to the MPLS connection number can be dealt with using such a procedure. With the preferred embodiment of the group replacement circuit, only the most frequently occurring fault on the route can be dealt with.
  • the ring in the present exemplary embodiment is made up of linear 1 + 1 structures.
  • the use of a 1: 1 structure according to FIG. 3 brings further advantages.
  • special data can be transmitted over the alternative route during the trouble-free time on the operating route.
  • General tax data can be used as special data.
  • the low-priority traffic is then in this case by replacing ⁇ turn the high-priority traffic automatically displaced.
  • the replacement of the special data in the case of a replacement does not take place by switching the switching device S in FIG. 2, but by prioritizing the high-priority traffic over the low-priority special data in each transmission device.
  • the operating and replacement lines WE and PE must be set up before commissioning. For this purpose, connections between the label switched routers W and E and, if appropriate, at intermediate transmission devices must be set up (configured).
  • 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 is reserved in the transmission devices via the signaling protocol, so that the transmission of the information via the operating or replacement route is ensured.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Dans l'état de la technique, la commutation de remplacement de cellules MTA dans des structures en boucle est gérée de manière efficace grâce à l'utilisation de structures linéaires. L'invention vise à transférer ce mode de fonctionnement sur des architectures de réseaux MPLS en boucle. A cet effet, les structures MPLS linéaires sont transformées en une structure MPLS en boucle et deux liaisons MPLS unidirectionnelles opposées sont associées logiquement, chacune d'elles reliant les mêmes dispositifs de transmission. Les segments de service et les segments de remplacement suivent des trajectoires physiques différentes.
EP01923544A 2000-02-29 2001-01-12 Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls) Withdrawn EP1260064A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01923544A EP1260064A2 (fr) 2000-02-29 2001-01-12 Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP00104147 2000-02-29
EP00104147A EP1130853A1 (fr) 2000-02-29 2000-02-29 Dispositif de circuit pour la commutation de substitution d' installations de transmission dans des architectures d' anneau avec des paquets de MPLS
PCT/EP2001/000434 WO2001065776A2 (fr) 2000-02-29 2001-01-12 Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls)
EP01923544A EP1260064A2 (fr) 2000-02-29 2001-01-12 Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls)

Publications (1)

Publication Number Publication Date
EP1260064A2 true EP1260064A2 (fr) 2002-11-27

Family

ID=8167982

Family Applications (2)

Application Number Title Priority Date Filing Date
EP00104147A Withdrawn EP1130853A1 (fr) 2000-02-29 2000-02-29 Dispositif de circuit pour la commutation de substitution d' installations de transmission dans des architectures d' anneau avec des paquets de MPLS
EP01923544A Withdrawn EP1260064A2 (fr) 2000-02-29 2001-01-12 Circuit pour commutation de remplacement de dispositifs de transmission dans des architectures en boucle utilisant les paquets a commutation par etiquette multiprotocole (mpls)

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP00104147A Withdrawn EP1130853A1 (fr) 2000-02-29 2000-02-29 Dispositif de circuit pour la commutation de substitution d' installations de transmission dans des architectures d' anneau avec des paquets de MPLS

Country Status (6)

Country Link
US (1) US6704279B2 (fr)
EP (2) EP1130853A1 (fr)
CN (1) CN1331334C (fr)
AU (2) AU2001250297B2 (fr)
CA (1) CA2401433A1 (fr)
WO (1) WO2001065776A2 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1126742A1 (fr) * 2000-02-15 2001-08-22 Siemens Aktiengesellschaft Méthode de commutation de protection des dispositifs de transmission dans des réseaux MPLS
EP1126741A1 (fr) * 2000-02-15 2001-08-22 Siemens Aktiengesellschaft Méthode de commutation de protection des dispositifs de transmission dans des réseaux MPLS
US7380017B2 (en) * 2001-05-03 2008-05-27 Nortel Networks Limited Route protection in a communication network
FR2836313A1 (fr) * 2002-02-21 2003-08-22 France Telecom Methode de protection locale de chemins a commutation d'etiquettes avec partage de ressources
AU2003243112A1 (en) * 2002-10-04 2004-04-23 Telefonaktiebolaget Lm Ericsson (Publ.) Isolation of hosts connected to an access network
FI122292B (fi) 2002-10-24 2011-11-15 Tellabs Oy Menetelmä, järjestelmä ja verkko-olio puolenvaihdon suorittamiseksi
WO2004059927A1 (fr) * 2002-12-27 2004-07-15 Telefonaktiebolaget Lm Ericsson (Publ). Tunnellisation de trafic tdm sur des reseaux mpls
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
US7545735B1 (en) * 2003-03-11 2009-06-09 Atrica Israel Ltd. Scalable protection mechanism for hierarchical multicast service in ring based networks
US6970464B2 (en) * 2003-04-01 2005-11-29 Cisco Technology, Inc. Method for recursive BGP route updates in MPLS networks
US20090040922A1 (en) * 2004-05-06 2009-02-12 Umansky Igor Efficient protection mechanisms in a ring topology network utilizing label switching protocols
CN100440843C (zh) * 2004-05-12 2008-12-03 华为技术有限公司 一种环网及其业务实现方法
CN100359880C (zh) * 2004-10-15 2008-01-02 华为技术有限公司 在mpls环网中实现业务传送及保护的方法
CN100349437C (zh) * 2004-10-15 2007-11-14 华为技术有限公司 在mpls环网中传送控制信息的方法
US7406032B2 (en) 2005-01-06 2008-07-29 At&T Corporation Bandwidth management for MPLS fast rerouting
US7856018B2 (en) * 2008-05-12 2010-12-21 Fujitsu Limited Provisioning point-to-multipoint paths
EP2721426A4 (fr) * 2011-06-16 2015-04-01 Nokia Solutions & Networks Oy Déchargement dynamique du trafic
US20160011877A1 (en) * 2014-07-11 2016-01-14 Cavium, Inc. Managing instruction order in a processor pipeline
CN105337803B (zh) * 2015-11-19 2018-07-20 漳州科华技术有限责任公司 一种环形系统通讯线解裂检测方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19703992A1 (de) * 1997-02-03 1998-08-06 Siemens Ag Verfahren zum Ersatzschalten von Übertragungseinrichtungen in Ringarchitekturen zur bidirektionalen Übertragung von ATM-Zellen
DE19703993A1 (de) * 1997-02-03 1998-08-06 Siemens Ag Schaltungsanordnung zum Ersatzschalten von Übertragungseinrichtungen in Ringarchitekturen zur bidirektionalen Übertragung von ATM-Zellen
US6721269B2 (en) * 1999-05-25 2004-04-13 Lucent Technologies, Inc. Apparatus and method for internet protocol flow ring protection switching
US6530032B1 (en) * 1999-09-23 2003-03-04 Nortel Networks Limited Network fault recovery method and apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GUY PUJOLLE: "Les Réseaux", 1996, EYROLLES, PARIS, 08840 *

Also Published As

Publication number Publication date
US20040013085A1 (en) 2004-01-22
CN1618211A (zh) 2005-05-18
CN1331334C (zh) 2007-08-08
AU5029701A (en) 2001-09-12
WO2001065776A2 (fr) 2001-09-07
EP1130853A1 (fr) 2001-09-05
US6704279B2 (en) 2004-03-09
WO2001065776A3 (fr) 2002-01-31
CA2401433A1 (fr) 2001-09-07
AU2001250297B2 (en) 2004-04-29

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