WO2003105414A1 - Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls - Google Patents

Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls Download PDF

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Publication number
WO2003105414A1
WO2003105414A1 PCT/DE2002/002164 DE0202164W WO03105414A1 WO 2003105414 A1 WO2003105414 A1 WO 2003105414A1 DE 0202164 W DE0202164 W DE 0202164W WO 03105414 A1 WO03105414 A1 WO 03105414A1
Authority
WO
WIPO (PCT)
Prior art keywords
sink
source
network
mpls
networks
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/DE2002/002164
Other languages
German (de)
English (en)
Inventor
Thomas Belling
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
Siemens Corp
Original Assignee
Siemens AG
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, Siemens Corp filed Critical Siemens AG
Priority to AU2002320874A priority Critical patent/AU2002320874A1/en
Priority to PCT/DE2002/002164 priority patent/WO2003105414A1/fr
Priority to DE10297791T priority patent/DE10297791D2/de
Publication of WO2003105414A1 publication Critical patent/WO2003105414A1/fr
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
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/24—Multipath
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • 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
    • H04L45/22—Alternate routing
    • 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
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • 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
    • H04L49/00—Packet switching elements

Definitions

  • the present invention relates to a method for increasing the reliability of transmissions in IP and / or MPLS and / or in combined IP / MPLS networks.
  • IP networks are able to reconfigure themselves in the event of a failure of network elements or connections using so-called routing protocols so that in most cases the transmission of information is still possible. However, this reconfiguration often takes a few minutes. Such periods are too long for existing real-time connections, such as telephony, to be maintained.
  • So-called MPLS paths Multiple Path Label Switching
  • QoS Quality of Service
  • MPLS networks can also be operated independently of IP networks.
  • MPLS paths so-called LSPs (Label Switched Paths) are unidirectional So-called Label Switched Routers (LSR) conveys and can combine tree-like data from different sources in a sink Mechanisms to protect LSPs, either by switching to protection paths already set up in advance (“Protection Switch ching ”) or by setting up new paths or by reconfiguring existing paths (“ rerouting ”) are currently being developed in the IETF (see raft-ietf-mpls-recovery-frmwrk ⁇ 03.txt).
  • Errors that occur are detected in the sink and / or by LSRs located in the path.
  • a fault message upstream from the detecting network element, ie, for example from the sink and / or an LSR, to one or more network elements which can carry out a switchover.
  • PSL the so-called "Path switch LSRs"
  • layer 2 In the IETF it is intended to use layer 2 or layer 3 mechanisms (see section 3.6 above). If layer 2 is used, direct paths are used by the detector Network element provided for one or more PSLs. However, this means that layer 2 must offer appropriate functionality. The general possibility of using different layer 2 technologies in different sections of an LSP can also lead to problems.
  • layer 3 An error message from the detecting network elements is forwarded to the next LSR upstream, which means that a new functionality is required in all LSRs involved.A total failure of an LSR cannot be remedied with such a mechanism.
  • IP for example ATM
  • TDM or ATM switches are now built internally redundantly in order to increase security.
  • IP routers do not support redundancy of Layer 2 connections and do not offer any redundancy in their internal architecture either, because in an IP environment, resilience is primarily a function of the network and not individual connections and / or Routers is viewed. As a result, in the case of IP networks, a real-time connection may be interrupted if errors occur.
  • the object of the present invention was to provide a method by means of which it is possible to simply ensure an increase in the reliability of transmissions in an IP and / or an MLSP and / or in a combined IP / MLSP network.
  • Security of transmissions between a source and a sink in IP and / or MPLS and / or combined IP / MPLS networks is provided in the event of interference, in which a fault report by means of a signaling protocol over a dedicated network or over a dedicated protected connection between the source and the sink is transmitted.
  • a signaling protocol which is transported in a particularly protected manner in a dedicated network, a signaling network or, via a dedicated connection, a signaling connection, can transmit information that is associated with this are suitable to prevent existing real-time connections from being interrupted.
  • the sink of an incoming packet stream can possibly occur interruptions or disturbances of the packet stream of a source of the packet stream via the dedicated network, i.e. Report via the special signaling network or via the dedicated signaling connection.
  • the interruptions and faults reported in this way can be caused both by the transmission network and directly by the sink.
  • a source of a packet stream may also be able to exchange messages with the sink of the packet stream via the dedicated network in the event of an error occurring directly at the source which leads to an interruption or disturbance of the packet stream. start over the special signaling network, or over the dedicated signaling connection.
  • Information relating to a further procedure is preferably exchanged between the source and the sink by means of the signaling protocol via the dedicated network or via the dedicated signaling connection.
  • a new transmission path for the transmission between the source and the sink is preferably specified as information relating to a further procedure.
  • the source can respond to a fault message from the sink by sending the subsequent packets in a different way through the IP or MLSP network.
  • the source of the sink here is via the special signaling network or via the dedicated one Signaling connection announces that it is another
  • Path chooses. Another way can be chosen, for example, in that the source forwards the packets to another edge router or in that the source explicitly specifies a different route in an IP header of the packets. In the latter case one speaks of a so-called "source routing". If MLSP is used, a different route can be chosen by the source selecting a different MPLS path.
  • the information relating to the further procedure can be transmitted as part of the fault report. This means that, for example, the sink that determined the fault already specifies in the fault message how to proceed with the subsequent packets.
  • Addresses have, as information relating to a further procedure, a change in the IP address at the source and / or the sink from the source and / or sink.
  • the change of the IP interfaces is negotiated between the source and the sink via the special signaling network or via the dedicated signaling connection.
  • the change of the IP interface at one end point or both end points can be used in an IP network to correct an error that occurs directly at the source or sink IP interface.
  • the change of the IP interface at one end point or both end points can also be used in an IP network to give the packet stream a new route through the network. Even in the event that the source and the sink are connected to each other via MPLS paths, it may be necessary to change IP interfaces together with a change in the MPLS path.
  • one end point A of the packet stream ie the source or the sink, has several IP interfaces with separate IP addresses and if there is a fault at end point A, then this end point A is trading with the other end point B of the packet stream via the special signaling network or via the dedicated signaling connection that A uses an intact IP interface 2 with a different IP address instead of the faulty IP interface 1 to receive and / or send the existing packet stream.
  • the other end point B must accordingly receive the existing packet stream from the new IP interface 2 or send it to the new IP interface 2.
  • end point B may be necessary for end point B to use a new IP interface 4 instead of the previously used IP interface 3, because only between interface 2 and interface 4, but not between interface 2 and interface 3, a connection with the necessary one Transmission quality exists, for example an MPLS path.
  • the possible change from the IP interface 3 to the IP interface 4 is also negotiated via the special signaling network or via the dedicated signaling connection between the end points A and B.
  • an SS7 network is selected as the dedicated signaling network, the signaling protocol being transported as a payload of the MTP level 3 layer or the SCCP layer, or a specially protected transport network is selected which consists of the layers SUA SCTP over IP, or SCCP over M3UA over SCTP over IP.
  • SS7 Signaling System 7
  • Message Transfer Part Level3 (MTP3b) and the so-called” Signaling Connection Control Part “(SCCP) are defined by the ITU-T.
  • SCTP Stream Control Transmission Protocol
  • M3UA MTP3-User Adaptation Layer
  • draf -ietf-sigtran-m3ua-12.txt and the so-called “Signaling Connection Control.”
  • SBA Part User Adaption Layer
  • the dedicated signaling connection is provided within an IP network by means of the "Stream Control Transmission Protocol (SCTP)", RFC 2960.
  • SCTP Stream Control Transmission Protocol
  • BICC Battery Independent Call Control
  • BICC is preferably selected as the signaling protocol.
  • BICC is defined by the ITU-T inter alia within the specifications Q.1901 and Q.1902.4 and can be carried within the above-mentioned MTP3b layer or the M3UA layer
  • BICC allows the transport of user connections, so-called “bearers”, over different packet networks, including IP networks with or without MPLS and in future also pure MPLS networks.
  • the so-called “Bearer Interworking Functions” (BIWF) then play the role of a source or sink of the packet streams of the user connections.
  • BICC permits the transparent transport of bearer-specific protocols between the BIWFs by means of the so-called "BICC Bearer Control Tunneling Protocol” (BCTP) in accordance with ITU-T specification Q.1990. This is in turn transported in messages of the BICC protocol Signaling can be used, for example, as an Extension of existing bearer-specific protocols, such as the so-called “IP Bearer Control
  • IPBCP ITU-T specification Q.1970
  • BCTP BCTP Protocol
  • the transport of BCTP in BICC is such that the signaling transported within BCTP is bound to a special user connection, such as a telephone call. If several user connections are affected simultaneously by an error such as the failure of an interface or a network connection, the necessary signaling messages, which can relate to several user connections simultaneously, can preferably be exchanged by means of the signaling actually assigned to an individual user connection via the transport in BCTP and BICC.
  • the semantics of the signaling according to the invention can preferably be selected such that messages always, or whenever expressed appropriately, relate to all user connections within a network connection, such as an MPLS path, or a network connection determined by the IP addresses of the endpoints.
  • a new protocol which is not linked to a special user connection and which can be used as an application, i.e. is transported as a so-called “user part” within a network, can be used for the signaling according to the invention.
  • a major advantage of the present invention is the fact that real-time connections, such as voice, are maintained in the event of errors using the method according to the invention.
  • the method according to the invention can be used both in a so-called “best effort IP network”, ie in an IP network that does not use any special mechanisms to ensure the transmission quality of real-time connections, as well as in IP networks that use Intserv, Diffserv or MPLS for this purpose.
  • the method according to the invention can also be used in MPLS networks without IP.
  • Signaling is also provided which is suitable for supporting redundant transport routes, for example in the form of a plurality of MPLS paths, between two end points.
  • redundant interfaces at end points of a packet stream are made possible without any non-redundant possible error points.
  • special support is not required on all connection sections and routers. If BICC is used as the signaling protocol, the functionality can be implemented with little effort, since a suitable signaling transport protocol is already available here.
  • FIG.l Schematic representation of a sequence of an embodiment of the method according to the invention, in which a new transmission path is selected in the event of a fault
  • FIG. 2 shows a schematic representation of a sequence of an embodiment of the method according to the invention, in which, in the event of a fault, new IP interfaces are selected together with new transmission paths,
  • FIG. 3 shows a schematic representation of a sequence of an embodiment of the method according to the invention, in which new IP interfaces are selected together with new MPLS paths in the event of a fault.
  • FIG. 1 shows a case in which there is a malfunction when a packet stream X is transmitted from a source Q with an IP interface Q1 to a sink S with an IP interface S1 through an IP network 1 on path 1 , The sink S notices the malfunction and sends a malfunction message to the source Q via a dedicated signaling network SN using a signaling protocol, such as BICC. This malfunction can be remedied by the packet stream X taking a different route 2 through the IP network 1 is sent.
  • a signaling protocol such as BICC
  • a specific route through the IP network 1 can be determined, for example, by the source Q, for example by explicitly specifying corresponding routers in the IP headers of the packets.
  • Q and S exchange the necessary signaling via the dedicated network SN, which has specially protected connections and is therefore not affected by interference in the IP network 1.
  • This can be an SS7 network that transports BICC, for example.
  • Figure 2 shows another variant of an inventive
  • a disturbance in the transmission of a packet stream X from an IP interface Q.l to an IP interface S.l is eliminated here by the packet stream X being transmitted from an IP interface Q.2 to an IP interface S.2 instead.
  • this is ensured by the fact that the IP interfaces are connected via separate IP networks 1 and 2.
  • Q and S exchange the necessary signaling via a separate dedicated network SN, which, as in FIG. 1, can be a CSS7 network that transports BICC.
  • FIG. 3 shows the case in which MPLS paths are used when a packet stream is transmitted. Is shown here the case that when the IP interfaces change, both on the part of the source Q and on the part of the sink S, there is also a change from an MPLS path 1 to a new MPLS path 2.

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

Abstract

La présente invention concerne un procédé permettant d'augmenter la sécurité intrinsèque de retransmissions dans des réseaux IP et/ou MPLS et/ou des réseaux combinés IP/MPLS en cas de perturbations. Un message de perturbation est transmis par un protocole de signalisation via un réseau dédié ou une liaison dédiée entre la source et le récepteur.
PCT/DE2002/002164 2002-06-10 2002-06-10 Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls Ceased WO2003105414A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2002320874A AU2002320874A1 (en) 2002-06-10 2002-06-10 Method for increasing the reliability of transmissions in ip and/or mpls networks and/or in combined ip/mpls-networks
PCT/DE2002/002164 WO2003105414A1 (fr) 2002-06-10 2002-06-10 Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls
DE10297791T DE10297791D2 (de) 2002-06-10 2002-06-10 Verfahren zur Erhoehung der Ausfallsicherheit von Uebertragungen in IP- und/oder MPLS- und/oder in kombinierten IP/MPLS-Netzen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2002/002164 WO2003105414A1 (fr) 2002-06-10 2002-06-10 Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls

Publications (1)

Publication Number Publication Date
WO2003105414A1 true WO2003105414A1 (fr) 2003-12-18

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PCT/DE2002/002164 Ceased WO2003105414A1 (fr) 2002-06-10 2002-06-10 Procede permettant d'augmenter la securite intrinseque de retransmissions dans des reseaux ip et/ou mpls et/ou dans des reseaux combines ip/mpls

Country Status (3)

Country Link
AU (1) AU2002320874A1 (fr)
DE (1) DE10297791D2 (fr)
WO (1) WO2003105414A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825780A (en) * 1994-05-05 1998-10-20 Sprint Communications Co.L.P. Method, system and apparatus for telecommunications control
EP1089575A2 (fr) * 1999-09-21 2001-04-04 Alcatel USA Sourcing, L.P. Système et méthode pour transporter des messages de signalisation de réseau intelligent sur un réseau IP
WO2001084790A1 (fr) * 2000-05-04 2001-11-08 Nortel Networks Limited Procede et appareil permettant de negocier les parametres de commande de porteuse par utilisation d'ensembles de proprietes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825780A (en) * 1994-05-05 1998-10-20 Sprint Communications Co.L.P. Method, system and apparatus for telecommunications control
EP1089575A2 (fr) * 1999-09-21 2001-04-04 Alcatel USA Sourcing, L.P. Système et méthode pour transporter des messages de signalisation de réseau intelligent sur un réseau IP
WO2001084790A1 (fr) * 2000-05-04 2001-11-08 Nortel Networks Limited Procede et appareil permettant de negocier les parametres de commande de porteuse par utilisation d'ensembles de proprietes

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DE10297791D2 (de) 2005-05-25
AU2002320874A1 (en) 2003-12-22

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