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WO2007042354A1 - Method and network element for the transmission of data in a network - Google Patents

Method and network element for the transmission of data in a network Download PDF

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Publication number
WO2007042354A1
WO2007042354A1 PCT/EP2006/066051 EP2006066051W WO2007042354A1 WO 2007042354 A1 WO2007042354 A1 WO 2007042354A1 EP 2006066051 W EP2006066051 W EP 2006066051W WO 2007042354 A1 WO2007042354 A1 WO 2007042354A1
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WO
WIPO (PCT)
Prior art keywords
resilient packet
ring
network element
data
network
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.)
Ceased
Application number
PCT/EP2006/066051
Other languages
German (de)
French (fr)
Inventor
Joao Martins
Pedro Teixeira
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
Nokia Solutions and Networks GmbH and Co KG
Siemens Corp
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
Siemens Corp
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Filing date
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Application filed by Siemens AG, Nokia Siemens Networks GmbH and Co KG, Siemens Corp filed Critical Siemens AG
Publication of WO2007042354A1 publication Critical patent/WO2007042354A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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]
    • H04L12/46—Interconnection of networks
    • H04L12/4637—Interconnected ring systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]

Definitions

  • the invention relates to a method and a network element for transmitting data in a network.
  • Resilient Packet Rings or rings For the transmission of data often so-called Resilient Packet Rings or rings, RPR short used. These consist of several network elements or network nodes, with which data are transmitted by known transmission methods or mechanisms for Resilient Packet Rings.
  • One problem is connecting Resilient Packet Rings together.
  • ⁇ by means of external Local Area Network, shortly LAN, Swit ⁇ ches, using IP router, using a hierarchical tree structure of resilient packet ring and by inde ⁇ ended tunnel process between different Resilient Packet Ring stations.
  • Object of the present invention is to provide fibers the transmission of data in a network with resilient packet ring to verbes ⁇ .
  • Called Edge Resilient Packet Rings to connect to each other via a Core Resilient Packet Ring.
  • the connection between two rings is effected by a so-called dual MAC station, that is a network element with two MAC stations, which in turn are miteinan ⁇ connected by means of multi-protocol label switching, short MPLS.
  • FIG. 1 shows such a dual MAC station.
  • One Resilient Packet Ring is connected to one of the two MAC stations.
  • a network is generated that consists of several Edge Resilient Packet Rings, which are interconnected by a Core Resilient Packet Ring, as shown in FIG. 2 or FIG.
  • MPLS multi-protocol label switching
  • Embodiments of the invention are specified in the subclaims as well as in the exemplary embodiment.
  • data or messages for non-ring network elements can be sent to another network element of the edge RPR, from which these are sent by MPLS to the ring-connecting network element and from there further by MPLS as described to the destination network element.
  • data between multi-protocol label switching-activated network elements of an Edge Resilient Packet Ring can also be transmitted by means of multi-protocol label switching. This has the advantage that another transmission path is available.
  • FIG. 1 shows a schematic representation of a dual MAC station
  • FIG. 2 shows a network with edge and core RPR
  • FIG. 3 shows another network with edge and core RPR
  • Figure 4 shows schematic representations of data packets.
  • FIG. 1 shows a schematic representation of a dual MAC station. This consists of two MAC facilities that are interconnected with ⁇ means of MPLS. At each MAC device, a Resilient Packet Ring is connected, fiction, ⁇ according to one side of an edge RPR, on the other hand a core RPR.
  • FIG. 2 shows a network with two edge RPRs ER1 and ER2, which are interconnected by means of a core RPR CR.
  • the network elements connecting the rings each have dual MAC stations.
  • MPLS is activated in all network elements.
  • the edge RPRs ER1 and ER2 in each case another network element of the edge RPR MPLS has activated, in FIG. 2 the network elements NE1 and NE2.
  • Data of a network element of the first edge RPR ER1 for a non-ring network element are in this case sent to the network element NEl.
  • FIG. 3 shows a further network consisting of four edge RPRs A, B, C, D, each with four network elements, A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1 , D2, D3, D4, which are interconnected by means of a Core RPR S.
  • the Core RPR S is thereby formed by the four network elements A3, B4, Cl and D2 Ge, the dual-MAC station are and in the core RPR the Be ⁇ drawing Sl (A3), S2 (B4), S3 (Cl), Wear S4 (D2).
  • the network elements of a ring, so the rings A, B, C, D so ⁇ as S are connected to each other by compounds / transmission paths in ring form.
  • a first device Al_l ange ⁇ closed this may for example be a device of a customer who wants to transfer data.
  • a second device C3_l is connected to the network element C, this may be, for example, a device of the same customer to whom he wants to receive the data.
  • the network elements of the core ring S have activated MPLS, as well as the network elements Al and C3. Between Al and C3 a label switched path LSP is switched, which leads over A3 / S1 and C1 / S3 as well as further network elements. In the intermediate network nodes, the transmission takes place by means of so-called MPLS tags.
  • FIG. 4 shows schematic illustrations of data packets with which data is transmitted.
  • FIG. 4A shows a data packet which from the first device Al_l to the second one
  • Device C3_l to be transmitted.
  • this data packet is entered as destination address, briefly DA, C3_l and as the source address or sender address, short SA, Al_l.
  • This address formations, the data follows, which is marked as payload.
  • This data packet from the device Al_l is received in the network element Al and since it is intended for a ring foreign network element, the data packet is preceded by an MPLS label, making it prefixed example ren with a wide ⁇ containing RPR header the destination address A3 and sender address Al_l , is transmitted to the dual MAC station of Ring A, as shown in Figure 4B.
  • the RPR header is exchanged according to the MPLS label and the target element is the network element with the dual MAC station S3 as destination ⁇ registered.
  • Sender address is the network element Sl.
  • This data packet shown in FIG. 4C is transmitted to the network element S3 / C1.
  • the RPR header is terminated and a new RPR header according to the MPLS label is prefixed, as shown in FIG. 4D.
  • the network node C3 is entered as the destination address and the network element C1 as the sender address.
  • the MPLS-activated network element A1 marks the data packet with an MPLS tag or an MPLS header and is sent in the ring to the dual MAC station A3 / S1.
  • This station uses the MPLS tag to transmit or route the packet to the next dual MAC station C1 / S3.
  • the station C1 / S3 sends the packet to the network element C3, which forwards it to the device C3_l.
  • the entire forwarding in the Core RPR is done with MPLS, ie MPLS Tags / MPLS Headers. It does not take place on the basis of MAC addresses.
  • MPLS MPLS layer of the dual MAC stations and the MPLS activated network elements transmit information to an EDGE RPR for forwarding Provides data packets.
  • the addresses of a MAC station or a network element are thus always known only one ring. For communication over multiple rings we only used MPLS. Thus, for example, overflow of MAC tables in network elements is avoided.
  • the data communication between network elements of a Resilient Packet Ring takes place by means of known Resilient Packet Ring transmission methods.
  • the communication in a Resilient Packet Ring can also be carried out by means of MPLS Layer Switching, if this is activated in the corresponding network elements.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention relates to a method and a network element for transmitting data in a network comprising at least one first and a second edge resilient packet ring that is provided with several network elements. Said at least one first and the second edge resilient packet ring are interconnected with the aid of a core resilient packet ring which encompasses several network elements, two rings being interconnected by means of a network element equipped with a dual MAC station. Multiprotocol label switching is activated in the network elements of the core resilient packet ring. Data within an edge resilient packet ring is transmitted using a resilient packet ring transmission process. Data for a network element that is foreign to the ring is transmitted to the multiprotocol label switching-activated network element of the ring, from which the data is transmitted to the edge resilient packet ring by the core resilient packet ring using multiprotocol label switching and is transmitted there to the destination network element by means of the resilient packet ring transmission process.

Description

Beschreibungdescription

Verfahren und Netzelement zur Übertragung von Daten in einem Netz .Method and network element for transmitting data in a network.

Die Erfindung betrifft ein Verfahren und ein Netzelement zur Übertragung von Daten in einem Netz.The invention relates to a method and a network element for transmitting data in a network.

Zur Übertragung von Daten werden häufig so genannte Resilient Packet Rings bzw. Ringe, kurz RPR, verwendet. Diese bestehen aus mehreren Netzelementen bzw. Netzknoten, womit Daten nach bekannten Übertragungsverfahren bzw. Mechanismen für Resilient Packet Rings übertragen werden. Ein Problem besteht darin, Resilient Packet Rings miteinander zu verbinden. Hier- für gibt es verschiedene bekannte Möglichkeiten, beispiels¬ weise mittels externer Local Area Network, kurz LAN, Swit¬ ches, mittels IP Router, mittels einer hierarchischen Baumstruktur von Resilient Packet Rings sowie mittels eigenstän¬ diger Tunnelverfahren zwischen verschiedenen Resilient Packet Ring Stationen.For the transmission of data often so-called Resilient Packet Rings or rings, RPR short used. These consist of several network elements or network nodes, with which data are transmitted by known transmission methods or mechanisms for Resilient Packet Rings. One problem is connecting Resilient Packet Rings together. Here- for there are various known possibilities, example ¬ by means of external Local Area Network, shortly LAN, Swit ¬ ches, using IP router, using a hierarchical tree structure of resilient packet ring and by inde ¬ ended tunnel process between different Resilient Packet Ring stations.

In der amerikanischen Patentanmeldung US 2003/0118041 Al ist ein Resilient Packet Ring Verbindungsverfahren für Telekommunikationsnetzwerke beschrieben, welches hierarchische Bäume von Ringen verwendet, über die die Paketkommunikation verschiedener Ringe durchgeführt wird.In the US patent application US 2003/0118041 Al a Resilient Packet Ring connection method for telecommunication networks is described which uses hierarchical trees of rings over which the packet communication of different rings is performed.

In der amerikanischen Patentanmeldung US 2004/022268 Al wird ein Resilient Packet Ring Netz beschrieben, bei dem ein Transport-LAN zur Verbindung verwendet wird.In the US patent application US 2004/022268 Al a Resilient Packet Ring network is described in which a transport LAN is used for connection.

Aufgabe der vorliegenden Erfindung ist es, die Übertragung von Daten in einen Netz mit Resilient Packet Rings zu verbes¬ sern .Object of the present invention is to provide fibers the transmission of data in a network with resilient packet ring to verbes ¬.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 oder einer Anordnung mit den Merkmalen des Anspruchs 5 gelöst. Erfindungsgemäß wird vorgeschlagen, so ge- nannte Edge Resilient Packet Rings über ein Core Resilient Packet Ring miteinander zu verbinden. Die Verbindung zwischen zwei Ringen erfolgt durch eine so genannte Dual-MAC Station, dass ist ein Netzelement mit zwei MAC-Stationen, die wiederum mittels Multi Protocol Label Switching, kurz MPLS, miteinan¬ der verbunden sind. In Figur 1 ist eine derartige Dual-MAC Station dargestellt. An einer der beiden MAC Stationen ist jeweils ein Resilient Packet Ring angeschlossen. Damit wird ein Netz generiert, dass aus mehreren Edge Resi- lient Packet Rings besteht, die durch einen Core Resilient Packet Ring miteinander verbunden sind, wie in Figur 2 oder Figur 3 gezeigt.This object is achieved by a method having the features of claim 1 or an arrangement having the features of claim 5. According to the invention, it is proposed to Called Edge Resilient Packet Rings to connect to each other via a Core Resilient Packet Ring. The connection between two rings is effected by a so-called dual MAC station, that is a network element with two MAC stations, which in turn are miteinan ¬ connected by means of multi-protocol label switching, short MPLS. FIG. 1 shows such a dual MAC station. One Resilient Packet Ring is connected to one of the two MAC stations. Thus, a network is generated that consists of several Edge Resilient Packet Rings, which are interconnected by a Core Resilient Packet Ring, as shown in FIG. 2 or FIG.

Erfindungsgemäß wird in den Netzelementen des Core Resilient Packet Rings, kurz Core RPR, Multi Protocol Label Switching, kurz MPLS, aktiviert. Somit ist auch in allen Netzelementen mit Dual-MAC Stations MPLS aktiviert .According to the invention, in the network elements of the Core Resilient Packet Ring, in short Core RPR, multi-protocol label switching, MPLS for short, is activated. Thus MPLS is also activated in all network elements with dual MAC stations.

Daten, die innerhalb eines Edge Resilient Packet Rings, kurz Edge RPR, von einen Netzelement zu einem anderen Netzelement des Edge RPR übertragen werden sollen, werden mittels bekann- ter Resilient Packet Ring Übertragungsverfahren übertragen.Data to be transferred from one network element to another Edge RPR network element within an Edge Resilient Packet Ring, or Edge RPR for short, is transmitted using known Resilient Packet Ring transmission techniques.

Daten für ein ringfremdes Netzelement werden zum Netzelement, dass Multi—Protocol Label Switching aktiviert hat, also den den Ringe verbindenden Netzelementen mit Dual-MAC Stations, übertragen. Von diesem werden die Daten mittels Multi— Protocol Label Switching durch den Core Resilient Packet Ring zum Ziel Edge Resilient Packet Ring übertragen und gegebenenfalls dort mittels Resilient Packet Ring Übertragungsverfah¬ ren zum Ziel-Netzelement übertragen. Der Vorteil des Verfahrens besteht darin, dass eine einfache und universelle Möglichkeit für die Übertragung von Daten zwischen verschiedenen Resilient Packet Rings mittels bekannter Verfahren gegeben ist.Data for a non-ring network element to the network element that has enabled multi-protocol label switching, ie the network elements connecting the rings with dual MAC stations, transmitted. From this, the data is transmitted by means of multi-protocol label switching through the Core Resilient Packet Ring to the destination Edge Resilient Packet Ring and possibly there by means of Resilient Packet Ring Übertragungsverfah ¬ ren transfer to the destination network element. The advantage of the method is that there is a simple and universal way of transferring data between different Resilient Packet Rings by known methods.

Ausgestaltungen der Erfindung sind in den Unteransprüchen so- wie im Ausführungsbeispiel angegeben.Embodiments of the invention are specified in the subclaims as well as in the exemplary embodiment.

In einer Ausgestaltung der Erfindung wird in einem weiteren Netzelement eines Edge Resilient Packet Rings Multi Protocol Label Switching aktiviert. Somit können Daten bzw. Nachrichten für ringfremde Netzelemente an eines weiteres Netzelement des Edge RPR gesendet werden, von dem diese mittels MPLS zum Ringverbindenden Netzelement gesendet werden und von dort weiter mittels MPLS wie beschrieben zum Ziel-Netzelement.In one embodiment of the invention, in another network element of an Edge Resilient Packet Rings Multi Protocol Label switching enabled. Thus, data or messages for non-ring network elements can be sent to another network element of the edge RPR, from which these are sent by MPLS to the ring-connecting network element and from there further by MPLS as described to the destination network element.

In einer weiteren Ausgestaltung der Erfindung können Daten zwischen Multi Protocol Label Switching aktivierten Netzelementen eines Edge Resilient Packet Ringes auch mittels Multi Protocol Label Switching übertragen werden. Dies hat den Vorteil, dass ein weiterer Übertragungsweg zur Verfügung steht.In a further embodiment of the invention, data between multi-protocol label switching-activated network elements of an Edge Resilient Packet Ring can also be transmitted by means of multi-protocol label switching. This has the advantage that another transmission path is available.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden unter Zuhilfenahme der Zeichnung näher erläutert. Dabei zeigtAn embodiment of the invention will be explained in more detail below with the aid of the drawing. It shows

Figur 1 eine schematische Darstellung einer Dual-MAC Station,FIG. 1 shows a schematic representation of a dual MAC station,

Figur 2 ein Netz mit Edge und Core RPR,FIG. 2 shows a network with edge and core RPR,

Figur 3 ein weiteres Netz mit Edge und Core RPR,FIG. 3 shows another network with edge and core RPR,

Figur 4 schematische Darstellungen von Datenpaketen.Figure 4 shows schematic representations of data packets.

Figur 1 zeigt eine schematische Darstellung einer Dual-MAC Station. Diese besteht aus zwei MAC Einrichtungen, die mit¬ tels MPLS miteinander verbunden sind. An jeder MAC Einrichtung ist ein Resilient Packet Ring angeschlossen, erfindungs¬ gemäß auf einer Seite ein Edge RPR, auf der anderen Seite ein Core RPR.FIG. 1 shows a schematic representation of a dual MAC station. This consists of two MAC facilities that are interconnected with ¬ means of MPLS. At each MAC device, a Resilient Packet Ring is connected, fiction, ¬ according to one side of an edge RPR, on the other hand a core RPR.

Figur 2 zeigt ein Netz mit zwei Edge RPR ERl und ER2, die mittels eines Core RPR CR miteinander verbunden sind. Die die Ringe verbindenden Netzelemente weisen jeweils Dual-MAC Sta- tions auf. Im Core RPR CR ist in allen Netzelementen MPLS aktiviert. In den Edge RPR ERl und ER2 hat jeweils ein weiteres Netzelement des Edge RPR MPLS aktiviert, in Figur 2 die Netzelemente NEl und NE2. Daten eines Netzelementes des ersten Edge RPR ERl für ein ringfremdes Netzelement werden hierbei zum Netzelement NEl gesendet. Von dort werden sie mittels MPLS mittels eines La¬ bel Switched Paths, kurz LSP, über NE3 und NE4, die Dual MAC Stations aufweisen zu NE2 übertragen. Dabei passieren die Daten weitere zwischenliegende Netzelemente. Von NE2 werden die Daten gegebenenfalls mittels bekannter RPR Übertragungsverfahren zu einem Ziel-Netzknoten des Edge RPR ER2 übertragen.FIG. 2 shows a network with two edge RPRs ER1 and ER2, which are interconnected by means of a core RPR CR. The network elements connecting the rings each have dual MAC stations. In the core RPR CR MPLS is activated in all network elements. In the edge RPRs ER1 and ER2, in each case another network element of the edge RPR MPLS has activated, in FIG. 2 the network elements NE1 and NE2. Data of a network element of the first edge RPR ER1 for a non-ring network element are in this case sent to the network element NEl. From there they are transmitted by means of MPLS by means of a La ¬ bel Switched Paths, short LSP, via NE3 and NE4, the dual MAC stations have to NE2. The data passes through other intermediate network elements. If necessary, the data is transmitted by NE2 to a destination network node of the edge RPR ER2 using known RPR transmission methods.

Figur 3 zeigt ein weiteres Netz, bestehend aus vier Edge RPR A, B, C, D, mit jeweils vier Netzelementen, Al, A2, A3, A4, Bl, B2, B3, B4, Cl, C2, C3, C4, Dl, D2, D3, D4, die mittels eines Core RPR S miteinander verbunden sind. Der Core RPR S wird dabei von den vier Netzelementen A3, B4, Cl und D2 ge- bildet, die Dual-MAC Stations sind und im Core RPR die Be¬ zeichnung Sl (A3), S2 (B4), S3 (Cl), S4 (D2) tragen. Die Netzelemente eines Ringes, also der Ringe A, B, C, D so¬ wie S sind miteinander durch Verbindungen/Übertragungswege in Ringform verbunden. An das Netzelement Al ist eine erste Einrichtung Al_l ange¬ schlossen, dies kann beispielsweise eine Einrichtung eines Kunden sein, der Daten übertragen möchte. Ebenso ist an das Netzelement C eine zweite Einrichtung C3_l angeschlossen, dies kann beispielsweise eine Einrichtung des gleichen Kunden sein, an er die Daten empfangen möchte.FIG. 3 shows a further network consisting of four edge RPRs A, B, C, D, each with four network elements, A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1 , D2, D3, D4, which are interconnected by means of a Core RPR S. The Core RPR S is thereby formed by the four network elements A3, B4, Cl and D2 Ge, the dual-MAC station are and in the core RPR the Be ¬ drawing Sl (A3), S2 (B4), S3 (Cl), Wear S4 (D2). The network elements of a ring, so the rings A, B, C, D so ¬ as S are connected to each other by compounds / transmission paths in ring form. To the network element Al is a first device Al_l ange ¬ closed, this may for example be a device of a customer who wants to transfer data. Similarly, a second device C3_l is connected to the network element C, this may be, for example, a device of the same customer to whom he wants to receive the data.

Die Netzelemente des Core Ringes S haben MPLS aktiviert, e- benso die Netzelemente Al und C3. Zwischen Al und C3 ist ein Label Switched Path LSP geschalten, der über A3/S1 und C1/S3 sowie weitere Netzelemente führt. In den zwischenliegenden Netzknoten erfolgt die Übertragung mittels so genannter MPLS Tags.The network elements of the core ring S have activated MPLS, as well as the network elements Al and C3. Between Al and C3 a label switched path LSP is switched, which leads over A3 / S1 and C1 / S3 as well as further network elements. In the intermediate network nodes, the transmission takes place by means of so-called MPLS tags.

Figur 4 zeigt schematische Darstellungen von Datenpaketen, mit denen Daten übertragen werden. Figur 4A zeigt ein Daten- paket, welches von der ersten Einrichtung Al_l zur zweitenFIG. 4 shows schematic illustrations of data packets with which data is transmitted. FIG. 4A shows a data packet which from the first device Al_l to the second one

Einrichtung C3_l übertragen werden soll. In diesem Datenpaket ist als Zieladresse, kurz DA, C3_l und als Quelladresse bzw. Absenderadresse, kurz SA, Al_l eingetragen. Diesen Adressin- formationen schließen sich die Daten an, was als Payload gekennzeichnet ist. Dieses Datenpaket von der Einrichtung Al_l wird im Netzelement Al empfangen und, da es für ein ringfremdes Netzelement bestimmt ist, wird dem Datenpaket ein MPLS Label vorangestellt, womit es beispielsweise mit einem weite¬ ren vorangestellten RPR Header, der die Zieladresse A3 und Absenderadresse Al_l enthält, zur Dual-MAC Station des Ringes A übertragen wird, wie in Figur 4B dargestellt . Im Netzelement / der Dual-MAC Station A3/S1, die sowohl zum Edge Ring A als auch zum Core Ring S gehört, wird der RPR Header gemäß dem MPLS Label getauscht und als Zieladresse wird das Netzelement mit der Dual-MAC Station S3 als Zielad¬ resse eingetragen. Absenderadresse ist das Netzelement Sl. Dieses in Figur 4C dargestellte Datenpaket wird zum Netzele- ment S3/C1 übertragen.Device C3_l to be transmitted. In this data packet is entered as destination address, briefly DA, C3_l and as the source address or sender address, short SA, Al_l. This address formations, the data follows, which is marked as payload. This data packet from the device Al_l is received in the network element Al and since it is intended for a ring foreign network element, the data packet is preceded by an MPLS label, making it prefixed example ren with a wide ¬ containing RPR header the destination address A3 and sender address Al_l , is transmitted to the dual MAC station of Ring A, as shown in Figure 4B. In the network element / the dual-MAC station A3 / S1, which belongs to both the Edge Ring A and the Core Ring S, the RPR header is exchanged according to the MPLS label and the target element is the network element with the dual MAC station S3 as destination ¬ registered. Sender address is the network element Sl. This data packet shown in FIG. 4C is transmitted to the network element S3 / C1.

Im Dual-MAC Netzelement S3/C1, das sowohl zum Ring S als auch zum Ring C gehört, wird der RPR Header terminiert und ein neuer RPR Header gemäß dem MPLS Label vorangestellt, wie in Figur 4D dargestellt. Im Netzelement S3/C1 wird als Zielad- resse der Netzknoten C3 eingetragen und als Absenderadresse das Netzelement Cl.In the dual MAC network element S3 / C1, which belongs to both ring S and ring C, the RPR header is terminated and a new RPR header according to the MPLS label is prefixed, as shown in FIG. 4D. In the network element S3 / C1 the network node C3 is entered as the destination address and the network element C1 as the sender address.

Im Netzelement C3 wird der RPR und der MPLS Header entfernt und das Datenpaket, wie in Figur 4E dargestellt, zur Einrich¬ tung C3_l weitergegeben.In the network element C3 of RPR and MPLS header is removed and passed on the data packet, as shown in Figure 4E to Einrich ¬ tung C3_l.

Zusammengefasst lässt sich sagen, dass im MPLS aktivierten Netzelement Al das Datenpaket mit einem MPLS Tag bzw. einem MPLS Header markiert wird und im Ring zur Dual-MAC Station A3/S1 gesendet wird. Diese Station benutzt den MPLS Tag, um das Paket zur nächsten Dual-MAC Station C1/S3 zu übertragen bzw. zu routen. Die Station C1/S3 sendet das Paket zum Netzelement C3, die es zur Einrichtung C3_l weitergibt.In summary, the MPLS-activated network element A1 marks the data packet with an MPLS tag or an MPLS header and is sent in the ring to the dual MAC station A3 / S1. This station uses the MPLS tag to transmit or route the packet to the next dual MAC station C1 / S3. The station C1 / S3 sends the packet to the network element C3, which forwards it to the device C3_l.

Die gesamte Weiterleitung im Core RPR erfolgt mit MPLS, also MPLS Tags / MPLS Headers. Sie erfolgt nicht auf der Basis von MAC Adressen. Das bedeutet, dass die MPLS Schicht der Dual- MAC Stationen und der MPLS aktivierten Netzelemente einem EDge RPR eine Übertragungsinformation zur Weiterleitung von Datenpaketen zur Verfügung stellt. Die Adressen einer MAC Stationen bzw. eines Netzelementes sind somit immer nur einem Ring bekannt. Für die Kommunikation über mehrere Ringe wir nur MPLS eingesetzt. Somit wird beispielsweise das Überlaufen von MAC Tabellen in Netzelementen vermieden.The entire forwarding in the Core RPR is done with MPLS, ie MPLS Tags / MPLS Headers. It does not take place on the basis of MAC addresses. This means that the MPLS layer of the dual MAC stations and the MPLS activated network elements transmit information to an EDGE RPR for forwarding Provides data packets. The addresses of a MAC station or a network element are thus always known only one ring. For communication over multiple rings we only used MPLS. Thus, for example, overflow of MAC tables in network elements is avoided.

Die Datenkommunikation zwischen Netzelementen eines Resilient Packet Rings erfolgt mittels bekannter Resilient Packet Ring Übertragungsverfahren . Alternativ kann die Kommunikation in einem Resilient Packet Ring auch mittels MPLS Layer Switching durchgeführt werden, sofern dies in den entsprechenden Netzelementen aktiviert wird. The data communication between network elements of a Resilient Packet Ring takes place by means of known Resilient Packet Ring transmission methods. Alternatively, the communication in a Resilient Packet Ring can also be carried out by means of MPLS Layer Switching, if this is activated in the corresponding network elements.

Claims

Patentansprüche claims 1. Verfahren zur Übertragung von Daten in einem Netz, aufweisend mindestens einen ersten und einen zweiten, mehrere Netz- elemente aufweisen Edge Resilient Packet Ring, die durch ei¬ nen mehrere Netzelemente aufweisenden Core Resilient Packet Ring miteinander verbunden werden, wobei zwei Ringe durch ein Netzelement mit einer Dual-MAC Station miteinander verbunden werden, dass in den Netzelementen des Core Resilient Packet Rings Multi Protocol Label Switching aktiviert wird, dass Daten innerhalb eines Edge Resilient Packet Rings mit¬ tels Resilient Packet Ring Übertragungsverfahren übertragen werden, und Daten für ein ringfremdes Netzelement zum Multi—Protocol Label Switching aktivierten Netzelement des Ringes gesendet werden, von dem die Daten mittels Multi—Protocol Label Swit¬ ching durch den Core Resilient Packet Ring zum Edge Resilient Packet Ring gesendet werden und dort mittels Resilient Packet Ring Übertragungsverfahren zum Ziel-Netzelement übertragen werden .1. A method for transmitting data in a network comprising at least a first and a second, multiple network elements Edge Resilient Packet Ring, which are interconnected by ei ¬ nen multiple network elements having Core Resilient packet ring, wherein two rings by a Network element with a dual MAC station are connected to each other that in the network elements of the Core Resilient Packet Ring Multi Protocol Label Switching is activated, that data is transmitted within an Edge Resilient Packet Ring ¬ means Resilient Packet Ring transmission method, and data for a non-ring network element activated for Multi-Protocol label switching network element of the ring are transmitted, from which the data using Multi-Protocol label Swit ¬ ching sent by the Core Resilient Packet ring for Edge Resilient Packet ring and there by means of resilient packet ring transmission process to the destination network element be transmitted . 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in einem weiteren Netzelement eines Edge Resilient Pa¬ cket Rings Multi Protocol Label Switching aktiviert wird.2. The method according to claim 1, characterized in that in a further network element of an Edge Resilient Pa ¬ cket Ring Multi Protocol Label Switching is activated. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass Daten zwischen Multi Protocol Label Switching aktivierten Netzelementen eines Edge Resilient Packet Ringes mittels Multi Protocol Label Switching übertragen werden.3. The method according to claim 2, characterized in that data between Multi Protocol Label Switching activated network elements of an Edge Resilient Packet Ringes are transmitted by means of Multi Protocol Label Switching. 4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Multi Protocol Label Switching Übertragung mittels Label switched Paths durchgeführt wird. 4. The method according to any one of the preceding claims, characterized in that the multi-protocol label switching transmission is performed by means of label switched paths. 5. Netzelement umfassend Mittel zur Durchführung des Verfah¬ rens nach einem der Ansprüche 1 bis 4. 5. A network element comprising means for carrying out the procedural ¬ proceedings according to any one of claims 1 to. 4
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