WO2008003213A1 - Procédé destiné à donner des informations de pannes sur la base d'un protocole et dispositif de détection de transmission bidirectionnelle - Google Patents

Procédé destiné à donner des informations de pannes sur la base d'un protocole et dispositif de détection de transmission bidirectionnelle Download PDF

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Publication number
WO2008003213A1
WO2008003213A1 PCT/CN2007/001623 CN2007001623W WO2008003213A1 WO 2008003213 A1 WO2008003213 A1 WO 2008003213A1 CN 2007001623 W CN2007001623 W CN 2007001623W WO 2008003213 A1 WO2008003213 A1 WO 2008003213A1
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WO
WIPO (PCT)
Prior art keywords
fault
information
bfd
psn
link
Prior art date
Application number
PCT/CN2007/001623
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English (en)
Chinese (zh)
Inventor
Kang Zi
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008003213A1 publication Critical patent/WO2008003213A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • 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

Definitions

  • the present invention relates to the field of network communication technologies, and in particular, to a method for advertising fault information based on a bidirectional forwarding detection protocol and a service provider edge device.
  • Virtual Private Network is a technology that relies on the Internet (Internet Service Provider) and Network Service Provider (NSP) to establish a dedicated data communication network in a public network. According to the implementation level, it is divided into Layer 2 VPN (L2VPN) and Layer 3 VPN (L3VPN).
  • L2VPN Layer 2 VPN
  • L3VPN Layer 3 VPN
  • L2VPN provides a Layer 2 VPN service based on the Packet Switched Network (PSN), which enables operators to provide Layer 2 VPNs of different media on a unified PSN network.
  • the medium includes ATM (Asynchronous Transfer Mode). ), FR (Frame Relay), VLAN (Virtual Local Area Network), Ethernet (Ethernet), PPP (Point-to-Point Protocol), etc.
  • MPLS Multi-Protocol Label Switching
  • MPLS L2VPN transparently transmits Layer 2 data of users on an MPLS network. From the user's point of view, the MPLS network is a Layer 2 switching network that can establish Layer 2 connections between different nodes.
  • each user edge device CE, Customer Edge
  • VC virtual circuit
  • the MPLS L2VPN model consists of the following three parts:
  • CE Customer Edge
  • SP service provider
  • the CE can be a router or a switch, or it can be a host.
  • CE "perceives" the existence of a VPN and does not need to support MPLS.
  • PE Provide Edge: An edge device (such as a router) on the service provider network that is directly connected to the CE. In an MPLS network, all processing of the VPN occurs on the PE.
  • P Provider : is a backbone router in the service provider network and is not directly connected to the CE. P The device only needs to have basic MPLS forwarding capability and does not maintain VPN information.
  • VC is a one-way logical connection between two nodes, specifically a one-way logical connection between two PEs.
  • a pseudowire PW, Pseudo-Wire
  • VC is a one-way logical connection between two nodes, specifically a one-way logical connection between two PEs.
  • a pseudowire PW, Pseudo-Wire
  • VC is a one-way logical connection between two nodes, specifically a one-way logical connection between two PEs.
  • a pseudowire PW, Pseudo-Wire
  • the work of establishing and maintaining the PW is completed by the PE using signaling, and the status information of the PW is maintained by the two endpoint PEs of the PW.
  • the LSP Label-Switched Path
  • L2VPN also implements transparent transmission of user messages in the MPLS network through the label stack:
  • the first layer (outer layer) label is used to exchange inside the backbone network, indicating an LSP from the PE to the peer PE.
  • the VPN packet can be used to reach the peer PE along the LSP.
  • the second layer (inner layer) label also called the PW label in the MPLS L2VPN, is used when the peer PE reaches the CE, indicating which CE the message should be sent to.
  • the peer PE ⁇ can find the interface for forwarding packets according to the inner label. It is used to distinguish different connections in different VPNs.
  • the receiving PE determines which CE to forward packets to according to the PW label.
  • BFD Bidirectional Forwarding Detection
  • the periodic failure detection mechanism includes the interface, the data link, and the detection of the forwarding engine itself.
  • BFD can be used to detect PSN faults and can also be used to detect PW faults.
  • the fault of the PSN mainly refers to the fault of the PSN link between the PEs. Take the MPLS (a specific case of the PSN) as an example.
  • the fault of the PSN link refers to the LSP fault.
  • BFD is run on the PSN link between a pair of PEs to detect PSN link faults.
  • BFDs are also respectively used on each FW included in the PSN link to detect respectively. The failure of each PW.
  • the remote PE2 is notified of the failure. In addition, the remote PE2 notifies the CE2, and the remote CE2 can select another path to forward the message.
  • the inventor has found that when a PE has a large number of PWs, if a fault occurs between the PE and several CEs, the PE needs to run through multiple PWs (corresponding to multiple CEs).
  • the BDF message on the BDF reports the fault condition to the remote PE, and the fault notification processing of the F
  • the burden is very large, and because BFD packets need to be sent continuously, they also occupy a large amount of bandwidth of the network. Summary of the invention
  • Embodiments of the present invention provide a method for advertising fault information based on a bidirectional forwarding detection protocol and a service provider edge device, which can effectively reduce the fault notification burden of the network.
  • An embodiment of the present invention provides a method for advertising fault information based on a bidirectional forwarding detection protocol, including: running a bidirectional forwarding detection protocol BFD on a PSN link of a packet switching network between a first serving provider edge device PE and a second PE The first PE advertises the fault information to the second PE by using the BFD running on the PSN link when a fault occurs between the first PE and the user network edge device CE connected thereto.
  • BFD bidirectional forwarding detection protocol
  • the embodiment of the present invention further provides a service provider edge device, including: a BFD running unit, configured to run a bidirectional forwarding detection protocol BFD on a PSN link of a packet switching network between the local PE and the second PE;
  • the processing unit is configured to notify the second PE of the fault information by using a BFD running on the PSN link when a fault occurs between the local PE and the CE connected thereto.
  • the BFD session on the PSN link running between the PEs notifies the peer PE of the fault information, instead of running the corresponding The BFD on the PW advertises the fault information. Therefore, when the fault between the PE and the CE involves multiple CEs, the fault information can be advertised only through the BFD running on the PSN link.
  • the fault notification of the BFD on the PW greatly reduces the processing load of the PE, and naturally reduces the forwarding burden of the entire network.
  • FIG. 1 is a schematic diagram of a prior art networking structure
  • FIG. 2 is a schematic structural diagram of a networking according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of a service provider edge device according to the present invention.
  • only BFD is run between the PE and the PE.
  • the BFD does not detect each PW and only detects the PSN fault (that is, the PSN link fault).
  • the BFD for detecting the PSN fault is the BFD running on the PSN link
  • the BFD for detecting the specific PW fault is the BFD running on each PW
  • the BFD in the embodiment of the present invention Only detect PSN faults without detecting F
  • the fault is advertised only by the BFD running on the PSN link (such as the LSP) between the PE and the PE, but not by the BFD running on each PW inside the PSN link. Fault notification. Because BFD is not running on each PW between the PE and the PE, the number of BFDs running between PEs does not increase with the increase of PW.
  • the PE When a fault occurs between the PE and the CE (the PE can detect the fault between the PE and the CE), the PE carries multiple PWs through the BFD packets running on the PSN link. Represents a fault between multiple CEs and PEs. It notifies the remote PE of the fault between the PE and the CE.
  • the specific example of the embodiment of the present invention is described below by taking a specific example MPLS network of the PSN as an example.
  • the LSP corresponds to the PSN link.
  • the PSN fault mainly refers to the PSN link failure.
  • the network fault mainly refers to the LSP fault.
  • PE1 is connected to multiple CEs, which are respectively recorded as CE1 and CE2 CEn.
  • PE2 is also connected to multiple CEs, which are respectively recorded as CEa and CEb.
  • PSN link exists between PE1 and PE2 LSPL particular, it runs on a BFD LSPl, LSP1 comprising a plurality of PW, wherein the corresponding PW is PWl CE1, and CE2 corresponding PW PW2 0
  • PE1 When a fault occurs between PE1 and PE1, PE1 sends the PW1 corresponding to CE1 (which essentially represents the fault between PE1 and CE1) to the remote PE2 through BFD running on LSP1 to notify the fault between CE1 and PE1. information. After confirming that F2 receives the FW1 information, PE2 will not send the same fault notification. 0 ' If PE1 and CE1, CE2 and other CEs are faulty at the same time, PE1 can notify the fault through the BFD running on LSP1.
  • the notification message carries the fault information of the PW corresponding to multiple CEs (essentially representing the fault between PE1 and multiple CEs).
  • the advertisement is advertised by multiple BFD packets carrying the PW fault information. After receiving the fault notification, PE2 advertises the fault to the corresponding CE connected to PE2 through the existing protocol, and stops forwarding data traffic.
  • PE1 After the fault is rectified between PE1 and CE1, PE1 sends the fault recovery of PW1 corresponding to CE1 to the remote PE2 through the BFD running on the LSP (substantially represents the fault recovery between PE1 and CE1). After the protocol stipulates that PE2 receives the packet, it does not send the fault recovery announcement.
  • Embodiment 1 If the FW type is the same and the PW ID is not continuous, an example of the BFD failure notification packet format is shown in Table 1.
  • Type indicates that the fault type is a fault from PE to CE.
  • the content of this field indicates that the fault information reported by the BFD fault in the temple is the fault information between the PE and the CE.
  • Length is the number of bytes of the entire message
  • PW Type is the PW Type defined in the PWE3 protocol, including Frame Relay Data Link Connection Identifier (DLCI), Ethernet Tagged (Ethernet Label) mode, Ethemet, HDLC (High-Level Data Link Control, Advanced Data Link Control), PPP> ATM n to 1 VCC (Virtual Channel Connection) Cell Transparent Transmission, ATM n to 1 VPC (Virtual Path Connection) Cell Transparent Transmission, ATM 1 Pair 1 VCC cell transparent transmission, ATM 1 to 1 VPC cell transparent transmission, and frame relay port mode;
  • DLCI Frame Relay Data Link Connection Identifier
  • Ethernet Tagged Ethernet Tagged
  • HDLC High-Level Data Link Control
  • PPP Physical Path Connection
  • the PW Number is the number of PWs recorded in the PW ID field described below;
  • the PW ID is used to record the identifier of the PW corresponding to the CE involved in the fault.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a fault notification message may carry the F information corresponding to the CEs involved in the fault, and further, the fault notification message carrying the relevant PW information
  • the peer PE advertises fault information between the local PE and the CE.
  • Table 2 The format of the BFD failure notification packet in this example is shown in Table 2.
  • the PW ID field following the Number field records a range.
  • the method shown in the foregoing Embodiment 2 may be adopted, that is, the EndPWID (End PWID) and the First PWID. (Initial PWID) can be expressed by the ID of the PW.
  • 2000 PW information A 1500-byte message, except for the basic information of BFD is less than 100 bytes, each PW ID field occupies 4 bytes, then 1400 bytes can store 348 PW IDs.
  • the 2000 PW information can be sent to the peer PE in only 6 packets.
  • the fault notification packet carries the complete information of multiple PWs, including the type, length, and quantity. And PW ID. Only 1400 bytes can store 87 PW information, and 2000 PWs can be sent to the peer PE with 23 messages.
  • the first embodiment and the second embodiment can be used at the same time. Therefore, in the worst case, 2000 PW information to be carried in order to notify the fault between 2000 CEs and PEs can be sent in only 18 packets. Go to the peer PE.
  • the BFD When the BFD sends a fault message on the PSN link (such as an LSP), it can be sent out according to the negotiated message interval, and the number of consecutively sent packets is controlled to a certain number, as in the above. For example, the limit case will not exceed 100 ⁇ . Therefore, when a fault message is sent by the BFD running on the PSN link, multiple packets can be directly sent continuously to achieve the purpose of fast fault notification.
  • a fault message is sent by the BFD running on the PSN link, multiple packets can be directly sent continuously to achieve the purpose of fast fault notification.
  • FIG. 3 is a schematic structural diagram of an embodiment of a service provider edge device according to the present disclosure.
  • the service provider edge device (PE) in this embodiment includes the BFD running unit 31, the fault processing unit 32, and the fault recovery processing unit 33.
  • the following describes the internal components of the PE in combination with the working principle of the PE in this embodiment. And the connection between the various components.
  • the BFD running unit 31 runs a bidirectional forwarding detection protocol BFD on the PSN link of the packet switching network between the PE and the peer PE, and the PSN link fault between the pair of PEs can be detected through the protocol.
  • the PE finds that there is a fault between itself and the connected CE, it notifies the fault processing unit 32, and further, the fault processing unit 32 notifies the fault information to the second PE through the BFD running on the PSN link.
  • the fault handling unit 32 may be a PW information advertising unit.
  • the PW information advertising unit sends a fault notification message by the second PE, and the fault notification message carries the PW information corresponding to the CE involved in the fault.
  • the PW information carried in the fault notification packet may include a fault involved. Multiple PW information corresponding to multiple CEs.
  • the fault processing unit 32 can advertise the multiple PW information to be carried to the peer by using a fault notification packet running on the PSN link.
  • the second PE in turn, the second PE of the peer end can obtain the CE information of the fault according to the corresponding relationship between the plurality of PW information in the received fault notification message and the CE.
  • the specific format of the fault notification packet can be various. Since it has been described in detail above, it will not be described again.
  • the fault recovery processing unit 33 can still notify the second PE of the opposite end of the fault recovery information through the BFD running on the PSN link.
  • the possibility of using other existing means is not disclosed for information announcement after failure recovery.

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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 destiné à donner des informations de panne sur la base d'un protocole de détection de transmission bidirectionnelle. Le procédé consiste à : effectuer une BFD sur la liaison PSN entre le premier PE et le second PE ; lorsque la panne se produit entre le premier PE et le CE qui lui est connecté, le premier PE donne les informations de panne au second PE en effectuant une BFD sur la liaison PSN. L'invention concerne également le routeur de périphérie pour fournisseur de services. Cette solution permet de réduire de façon efficace la charge d'informations de pannes du réseau.
PCT/CN2007/001623 2006-06-28 2007-05-18 Procédé destiné à donner des informations de pannes sur la base d'un protocole et dispositif de détection de transmission bidirectionnelle WO2008003213A1 (fr)

Applications Claiming Priority (2)

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CNB2006100614013A CN100459531C (zh) 2006-06-28 2006-06-28 一种基于双向转发检测协议通告伪线故障的方法
CN200610061401.3 2006-06-28

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