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WO2016192401A1 - Procédé et appareil de détection de bout en bout dans un réseau de multidiffusion p2mp-te - Google Patents

Procédé et appareil de détection de bout en bout dans un réseau de multidiffusion p2mp-te Download PDF

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Publication number
WO2016192401A1
WO2016192401A1 PCT/CN2016/072155 CN2016072155W WO2016192401A1 WO 2016192401 A1 WO2016192401 A1 WO 2016192401A1 CN 2016072155 W CN2016072155 W CN 2016072155W WO 2016192401 A1 WO2016192401 A1 WO 2016192401A1
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WIPO (PCT)
Prior art keywords
unicast
sub
p2mp
tunnel
label switching
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PCT/CN2016/072155
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English (en)
Chinese (zh)
Inventor
袁仁状
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中兴通讯股份有限公司
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Publication of WO2016192401A1 publication Critical patent/WO2016192401A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast

Definitions

  • This document relates to but not limited to the field of data network communication, and in particular to a P2MP-TE (Point 2 Multiple Point Traffic Engineering) multicast network end-to-end detection method and apparatus.
  • P2MP-TE Point 2 Multiple Point Traffic Engineering
  • the RFC (Request For Comments) provides a detailed description of the Internet communication protocol.
  • the P2MP-TE described in the RFC only supports the link FRR (Fast ReRoute). Protection, so as long as there is link BFD (Bidirectional Forwarding Detection) detection is sufficient to support.
  • link FRR protection cannot protect the entire device node. If a node is restarted, the protection will be invalid and the FRR deployment of the link is difficult. So I hope to introduce end-to-end protection for P2MP-TE. But if you want to achieve end-to-end protection, you need to have end-to-end fast detection.
  • the draft-ietf-bfd-multipoint-04.txt describes a BFD detection scheme for a multicast network.
  • the scheme first extends the protocol of the existing BFD, and the implementation complexity is high. It can be seen that the relevant detection schemes are insufficient. Therefore, how to maximize the connectivity of the P2MP-TE LSP (Label Switch Path) by using the existing BFD implementation becomes a technical problem to be solved by the present invention.
  • the embodiment of the invention provides an end-to-end detection method and device in a P2MP-TE multicast network, which is used to solve the problem of maximizing the connectivity of the P2MP-TE LSP by using the existing BFD.
  • the embodiment of the invention provides an end-to-end detection method in a P2MP-TE multicast network, including:
  • the established P2P bidirectional unicast tunnel is generated by referring to a record routing object corresponding to the sub-label switching path.
  • the establishing a P2P bidirectional unicast tunnel corresponding to the sub-label switching path of the P2MP-TE includes:
  • the detecting, for the link corresponding to the sub-label switching path of the P2MP-TE includes:
  • the link fault of the P2MP-TE sub-label switching path corresponding to the P2P bidirectional unicast tunnel in which the unicast BFD is dropped is determined.
  • the method of the present invention further includes:
  • the sub-label switching path corresponding to the P2MP-TE tunnel is notified to perform protection switching.
  • the embodiment of the invention further provides an end-to-end detection device in a P2MP-TE multicast network, including:
  • the tunnel establishment module is configured to establish a P2P bidirectional unicast tunnel corresponding to the P2MP-TE sub-label switching path along the physical path of the P2MP-TE sub-label switching path.
  • a detecting module configured to establish a unicast bidirectional forwarding detection BFD for the P2P bidirectional unicast tunnel, and, according to the unicast BFD, a chain corresponding to the sub label switching path corresponding to the unicast BFD in the P2MP-TE The road is tested.
  • the P2P bidirectional established by the tunnel establishment module The unicast tunnel is generated by referring to the record routing object corresponding to the sub-label switching path.
  • the tunnel establishing module is specifically configured to obtain a recording route object of a sub-label switching path of the P2MP-TE, and determine a physical path of the corresponding sub-label switching path according to the recording routing object.
  • Information establishing a corresponding P2P bidirectional unicast tunnel according to the physical path information.
  • the detecting module is specifically configured to detect a unicast BFD session of the P2P bidirectional unicast tunnel; when the unicast BFD session of the P2P bidirectional unicast tunnel is dropped, A link fault of the P2MP-TE sub-label switching path corresponding to the P2P bidirectional unicast tunnel in which the unicast BFD call is dropped.
  • the detecting module is further configured to notify the sub-label switching path corresponding to the P2MP-TE tunnel when detecting a link failure corresponding to one or more sub-label switching paths. Protection switching.
  • the solution in the embodiment of the present invention establishes a P2P bidirectional unicast tunnel along the path of the sub-LSP (sub-label switching path) of the P2MP-TE tunnel, and establishes BFD detection to implement the correlation chain of the Sub-LSP of the P2MP-TE.
  • Road detection which lays the foundation for the end-to-end protection of P2MP-TE.
  • the solution in the embodiment of the present invention does not need to separately implement the multicast BFD function for the P2MP-TE, and reuses the existing unicast BFD and adopts the bidirectional tunnel, so as to maximize the connectivity of the P2MP-TE LSP by using the existing BFD.
  • the use of bidirectional tunneling also avoids the uncontrollability of the BFD return path.
  • FIG. 1 is a flowchart of an end-to-end detection method in a P2MP-TE multicast network according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a specific application example of a detection method according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of an apparatus for detecting end-to-end in a P2MP-TE multicast network according to an embodiment of the present invention.
  • the embodiment of the invention provides an end-to-end detection method in a P2MP-TE multicast network, which can be applied to a router or a switch.
  • the method includes:
  • Step S101 Establish a P2P bidirectional unicast tunnel corresponding to the P2MP-TE sub-label switching path along the physical path of the P2MP-TE sub-label switching path.
  • the specific implementation manner of the step includes:
  • the established P2P bidirectional unicast tunnel is generated by referring to the path calculation object of the corresponding sub-label switching path.
  • the display route object of the established P2P bidirectional unicast tunnel is generated by referring to the record routing object of the corresponding sub-label switching path, where the explicit routing object is RSVP (Resource Reservation Protocol)
  • RSVP Resource Reservation Protocol
  • the RSVP protocol family is adopted in both P2P and P2MP.
  • Step S102 Establish a corresponding unicast BFD for the P2P bidirectional unicast tunnel, and detect, according to the unicast BFD, a link corresponding to the sub-label switching path corresponding to the unicast BFD in the P2MP-TE.
  • P2MP-TE may have multiple sub-label switching paths, and one-to-one unicast BFD may be established for one or more sub-label switching paths.
  • P2MP-TE has three sub-label switching paths: Sub-LSP1, Sub-LSP2, and Sub-LSP3.
  • the unicast BFD1 is only used to detect the link corresponding to Sub-LSP1, and is not used to detect the link corresponding to Sub-LSP2 or Sub-LSP3.
  • unicast BFD1, unicast BFD2, and unicast BFD2 are established is not specifically limited herein.
  • the unicast BFD can be established only for the part of the sub-label switching path. For example, only the unicast BFD1 is established.
  • the link corresponding to the P2MP-TE sub-label switching path is detected, including: detecting a unicast BFD session corresponding to the P2P bidirectional unicast tunnel, and the unicast BFD session corresponding to the P2P bidirectional unicast tunnel is dropped.
  • the link fault of the P2MP-TE sub-label switching path corresponding to the P2P bidirectional unicast tunnel in which the unicast BFD call is dropped is determined.
  • the method of the embodiment of the present invention further includes: when detecting a link failure corresponding to the sub-label switching path, sending a notification message that the link of the corresponding sub-label switching path is faulty to the P2MP-TE tunnel, In order to enable the P2MP-TE tunnel to trigger protection switching.
  • the embodiment of the present invention establishes a P2P bidirectional unicast tunnel along the P2MP-TE tunnel Sub-LSP path, and establishes BFD detection, and then performs association link detection on the P2MP-TE Sub-LSP, which is P2MP- TE's end-to-end protection lays the foundation for detection.
  • the embodiment of the present invention expounds the end-to-end detection method in the P2MP-TE multicast network provided by the embodiment of the present invention by exposing more details, specifically:
  • the P2MP-TE LSP can be subdivided into Sub LSPs to the tail (tail node).
  • the P2MP-TE tunnel source node provides the RRO (Record Route Object) of the Sub LSP to the management component of the P2P-TE (Point 2 Point Traffic Engineering).
  • RRO Record Route Object
  • P2P-TE Point 2 Point Traffic Engineering
  • Two-way unicast tunnel establishment is initiated by P2P-TE.
  • An RRO using a P2MP Sub LSP is established as a constraint path to perform path calculation, and an ERO (Explicit Route Object) of the P2P tunnel is generated.
  • the one-to-one mapping between the P2P (P2P) tunnel and the Sub LSP is adopted. This ensures that the P2P bidirectional unicast tunnel path is identical to the P2MP tunnel Sub LSP path.
  • the unicast BFD session is established for the P2P bidirectional unicast tunnel.
  • the BFD packet is also transmitted along the tunnel. This ensures that the BFD packet transmission path is consistent.
  • the P2MP tunnel is notified of the abnormality of the Sub-LSP, and the protection switch is triggered, so as to quickly detect the Sub-LSP of the P2MP tunnel.
  • the application example has two sub-label switching paths, one is a sub-label switching path 1Sub-LSP1, and the other is a sub-label.
  • Switching path 2Sub-LSP 2 Sub-LSP1 is established from node R1 to node R4, Sub-LSP2 is established from node R1 to node R5, bidirectional unicast tunnel 1P2P tunnel1 is established along Sub-LSP1, and bidirectional single is established along Sub-LSP2 After the tunnel is successfully established, the corresponding unicast BFD is established in P2P tunnel1 and P2P tunnel2 respectively.
  • the BFD session of the P2P tunnel 2 is down.
  • the sub-LSP 2 of the R1 node is triggered to perform end-to-end protection switching. If the link between the R3 and the R4 is faulty, the BFD session of the P2P tunnel1 and the P2P tunnel2 are dropped.
  • the sub-LSP1 and the sub-LSP2 of the P2MP-TE of the R1 node are respectively notified to perform end-to-end protection switching.
  • An embodiment of the present invention provides an end-to-end detection device in a P2MP-TE multicast network, as shown in FIG. 3, including:
  • the tunnel establishment module 310 is configured to establish a P2P bidirectional unicast tunnel corresponding to the P2MP-TE sub-label switching path along the physical path of the P2MP-TE sub-label switching path.
  • the detecting module 320 is configured to establish a corresponding unicast bidirectional rotation for the P2P bidirectional unicast tunnel.
  • the BFD is detected, and the link corresponding to the sub-label switching path corresponding to the unicast BFD in the P2MP-TE is detected according to the unicast BFD.
  • the P2P bidirectional unicast tunnel established by the tunnel establishment module 310 is generated by referring to the record routing object of the corresponding sub-label switching path.
  • the tunnel establishment module 310 is configured to obtain a record routing object of the sub-label switching path of the P2MP-TE, and determine the physical path information of the corresponding sub-label switching path according to the recording routing object; The physical path information is used to establish a corresponding P2P bidirectional unicast tunnel.
  • the detecting module 320 is configured to detect a unicast BFD session of the P2P bidirectional unicast tunnel; when the unicast BFD session of the P2P bidirectional unicast tunnel is dropped, it is determined that unicast occurs.
  • the detecting module is further configured to notify the sub-label switching path corresponding to the P2MP-TE tunnel to perform protection switching when detecting a link failure corresponding to one or more sub-label switching paths.
  • the device in the embodiment of the present invention is applied in P2P-TE.
  • the embodiment of the present invention establishes a P2P bidirectional unicast tunnel along the P2MP-TE tunnel Sub-LSP path, and establishes BFD detection, and then performs association link detection on the P2MP-TE Sub-LSP, which is P2MP- TE's end-to-end protection lays the foundation for detection.
  • the above technical solution does not require the development of a multicast BFD function for the P2MP-TE, and the connectivity of the P2MP-TE LSP is maximized by using the existing BFD. In addition, the uncontrollability of the BFD return path is also avoided.

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

Abstract

L'invention concerne un procédé et un appareil de détection de bout en bout dans un réseau de multidiffusion P2MP-TE. Le procédé consiste : à établir un tunnel de monodiffusion bidirectionnel point à point (P2P) correspondant à un chemin de commutation de sous-étiquette P2MP-TE le long d'un chemin physique du chemin de commutation de sous-étiquette P2MP-TE ; et à établir une détection de transfert bidirectionnel (BFD) de monodiffusion pour le tunnel de monodiffusion bidirectionnel P2P, et détecter, selon la BFD de monodiffusion, une liaison correspondant au chemin de commutation de sous-étiquette correspondant à la BFD dans le P2MP-TE.
PCT/CN2016/072155 2015-06-02 2016-01-26 Procédé et appareil de détection de bout en bout dans un réseau de multidiffusion p2mp-te WO2016192401A1 (fr)

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Application Number Priority Date Filing Date Title
CN201510295539.9A CN106301813A (zh) 2015-06-02 2015-06-02 P2mp-te组播网络中端到端的检测方法和装置
CN201510295539.9 2015-06-02

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