WO2009009992A1 - Procédé, système, extrémité de source et extrémité de destination pour indexer le trajet de commutation d'étiquettes au moyen d'une étiquette - Google Patents
Procédé, système, extrémité de source et extrémité de destination pour indexer le trajet de commutation d'étiquettes au moyen d'une étiquette Download PDFInfo
- Publication number
- WO2009009992A1 WO2009009992A1 PCT/CN2008/071595 CN2008071595W WO2009009992A1 WO 2009009992 A1 WO2009009992 A1 WO 2009009992A1 CN 2008071595 W CN2008071595 W CN 2008071595W WO 2009009992 A1 WO2009009992 A1 WO 2009009992A1
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- Prior art keywords
- label
- message
- switching path
- maintenance management
- packet
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012423 maintenance Methods 0.000 claims abstract description 33
- 230000007547 defect Effects 0.000 claims description 35
- 238000010276 construction Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
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- 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]
-
- 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
- H04L2012/5625—Operations, administration and maintenance [OAM]
Definitions
- the present invention relates to the field of communications, and more particularly to techniques for using a label index label switched path. Background technique
- OAM Operation, Administration & Maintenance
- MPLS Multiple Protocol Label Switching
- the source periodically sends MPLS OAM packets, such as CV.
- the sink performs connectivity detection based on the MPLS OAM packet, such as whether the CV or FFD packet can be detected. Regularly received, the content of the message is correct, etc., and the type of defect generated is determined according to the detection result; when the sink detects the defect, the BDI is sent through the reverse channel.
- the format of the MPLS OAM packet is as shown in Figure 1:
- the outer label of the MPLS OAM is MPLS label, which can be used as the outgoing label of the LSP.
- the inner label value of the packet is 14 ( OAM Route alert label ), and the rest is OAM Payload ( OAM payload).
- an LSP that is defective by the label index When an LSP that is defective by the label index is used, it can be applied in the case of exclusive back channel. In this case, you need to configure a reverse LSP for the LSP that is enabled with the OAM function. If the LSP is faulty, the BDI message is sent to the configured LSP. After the source end receives the BDI, the source device can uniquely index the LSP that is defective by using the label value of the outer label in the packet, thereby performing operations such as switching the LSP.
- the method of using the label to index defective LSPs does not support OAM in the following three cases:
- the first case sharing the reverse channel
- the sink sends the BDI packet to the source through the shared reverse LSP
- the outer label of the BDI packet is the same. Therefore, the source cannot index the LSP path that is faulty according to the outer label.
- Mp2p also known as the label merge technology
- the idea of the technology is: When the packet data with different tags arrives at an LSR (Label Switched Router) node (called a sink node), the LSR node Different inbound tags are merged and mapped to the same outgoing tag; the packet data is output using the same outgoing tag.
- LSR Label Switched Router
- the sink end may not be able to detect it because it can receive the detection packet sent through other LSP paths, so the OAM function cannot be performed well.
- the trick is that the outermost mark in the tag stack is popped up in the penultimate LSR in the LSP path, not in the LSP path.
- the exit LSR is ejected.
- the penultimate LSR decides which egress LSR in the LSP path forwards the packet data according to the tag located at the top of the stack, and ejects the outermost tag in the tag stack, and sends the tags of other layers together with the packet data.
- the egress LSR that is, the sink end of the LSP path, when receiving the packet data, determines the forwarding of the packet data according to the tag located at the top of the stack. If the packet data contains only one tag, after the penultimate hop is popped up, the egress LSR in the LSP path makes a forwarding decision based on the network layer packet header of the packet data.
- the outermost label is not available on the sink end of the LSP path. Therefore, it is impossible to use the label to index which LSP path has failed, so that the source cannot be notified.
- the source end cannot use the label value of the outer label in the BDI packet sent by the sink end, and uniquely indexes to the LSP with the defect;
- the sink cannot determine which LSP path is faulty according to the label value of the outer label in the packet sent by the source. Therefore, in any of the three cases, the end of the received packet cannot be received.
- the defective LSP is generated according to the label index in the packet sent by the peer end, so that OAM cannot be well supported.
- An embodiment of the present invention provides a method, a system, a source end, and a sink end for using a label index label switching path, and one end of the received message can forward LSP according to the label index in the received message.
- An embodiment of the present invention provides a method for using a label to index a label switching path, including: receiving a message, the message carrying an operation and maintenance management label, and identifying a forward label Change the inner label of the path;
- a forward label switching path in which a defect occurs according to the inner label index is a forward label switching path in which a defect occurs according to the inner label index.
- An embodiment of the present invention further provides a system for using a label index label switching path, including: a sending end, configured to send a message, the message carries an operation and maintenance management label, and is only used to identify a forward label switching path.
- a sending end configured to send a message
- the message carries an operation and maintenance management label, and is only used to identify a forward label switching path.
- the receiving end is configured to: when the packet arrives, a forward label switching path that is defective according to the inner label index.
- An embodiment of the present invention further provides a source end, including:
- An obtaining unit configured to receive a reverse defect notification message sent by using a shared reverse label switching path, where the reverse defect notification message carries an operation and maintenance management label, and an inner layer for identifying a forward label switching path Label
- An index unit configured to determine, according to the inner label, a forward label switching path in which a defect occurs.
- An embodiment of the present invention further provides another source, which includes:
- a constructing unit configured to construct an operation and maintenance management message, to carry the operation and maintenance management label, and an inner label for identifying a forward label switching path;
- a transmitting unit configured to send, by using the label switching path, the packet constructed by the message construction unit.
- An embodiment of the present invention further provides a sink, which includes:
- a packet obtaining unit configured to receive an operation and maintenance management packet, where the packet carries an operation and maintenance management label, and an inner label for identifying a forward label switching path;
- a path indexing unit configured to exchange a path according to the defect of the inner label index.
- An embodiment of the present invention further provides another sink terminal, including:
- a message construction unit configured to construct a reverse defect notification message, such that the message carries an OAM tag, and an inner layer tag for identifying a forward label switching path in which the defect occurs;
- a message transmission unit configured to share the message construction unit by sharing a reverse label switching path
- the constructed message is sent out.
- a defective forward LSP occurs according to an inner label index in the received packet, so in the case of sharing a reverse channel, an Mp2p LSP or a PHP,
- the receiving end of the packet can index the defective forward LSP according to the label carried in the packet.
- FIG. 1 is a schematic diagram of a format of an MPLS OAM packet provided by the prior art
- Figure 2 is a flow chart of the first embodiment of the present invention.
- FIG. 3 is a schematic diagram of a format of an OAM packet in the first embodiment of the present invention.
- Figure 4 is a flow chart of a second embodiment of the present invention.
- FIG. 5 is a schematic diagram of a format of an OAM packet according to a second embodiment of the present invention.
- Figure 6 is a flow chart of a third embodiment of the present invention. detailed description
- the one end of the packet can be forwarded according to the label carried in the packet, and the Mp2p LSP can be well supported.
- OAM in the case of PHP or shared reverse channel, which uses the label stack technology to add an inner layer label between the outer label and the OAM label. This label is used to identify the forward (from source to sink) LSP. And by negotiating or configuring the source end and the sink end, the identifier can be recognized.
- the first embodiment provided by the present invention is the first method for using a label index label switching path, which can support OAM in the case of an Mp2p LSP.
- the specific implementation process of this embodiment is shown in FIG. 2, and includes:
- Step S101 Each source end sends a respective OAM 4 message by using a forward LSP.
- Each OAM file carries an OAM tag and an inner tag that identifies the forward LSP.
- the format of the OAM packet is as shown in FIG. 3. It can be seen that the OAM packet includes an outer label and an OAM label, and an inner label disposed between the outer label and the OAM label.
- the outer label may be an MPLS label for forwarding.
- the inner label is used to uniquely identify a forward LSP.
- the OAM label may be an OAM packet with a label of 14.
- Step S102 After the OAM packet carrying the different inner label reaches the node that is aggregated by the forward LSP, the node maps the outer label to an outgoing label, and uses the outgoing label as the OAM packet. The outer label, and keep the inner label and OAM label unchanged, and then send the OAM to the text.
- the outbound label can be determined according to the LDP (Label Distribution Protocol), or can be determined according to the correspondence between the static label and the outgoing label.
- LDP Label Distribution Protocol
- Step S103 When the 0AM packet arrives at the sink end, the sink end indexes the defective LSP according to the LSP identified by the inner layer label carried in the 0AM packet.
- the sink can send a BDI packet to the source through the exclusive reverse LSP.
- the source can index the forward LSP that is defective according to the outer label carried in the BDI packet, and take corresponding switching measures. , to achieve OAM function.
- the sink may also send a BDI packet to the source through the shared reverse LSP.
- the format of the BDI packet is the same as the format of the OAM packet, and the inner label of the forward LSP needs to be carried.
- the inner label carried in the BDI packet can know which forward LSP is faulty, and thus take corresponding switching measures, so that the OAM function can be implemented.
- the label stacking technology separates the forwarding function from the indexing function, and the outer label serves as a forwarding function, and is responsible for the OAM packet at the source end and the sink end.
- the inner label is indexed and is only responsible for uniquely identifying a forward LSP. Therefore, when the 0AM packet arrives at the node where the LSP is aggregated, the node converts only the outer label, and the inner label of the forward LSP remains unchanged. Therefore, the sink can be based on the inner layer.
- the tag is indexed to the LSP where the defect occurred.
- the second embodiment provided by the present invention is a second method for using a label index label switching path.
- This method can support OAM in the case of PHP.
- the specific implementation process of this embodiment is shown in FIG. 4, and includes:
- Step S201 The source end sends an OAM packet through the forward LSP.
- the OAM packet carries the OAM label and the inner label used to identify the forward LSP.
- the format of the OAM packet is the same as that in the first embodiment, and includes an outer label and an OAM label, and an inner label disposed between the outer label and the OAM label.
- the outer label may be an MPLS label for forwarding.
- the inner label is only used to uniquely identify a forward LSP.
- the OAM tag may be an OAM ⁇ tag with a tag of 14.
- Step S202 When the OAM packet reaches the penultimate hop node of the LSP path, the node determines to receive the OAM packet according to the outer label of the OAM packet, and carries the inner label and the OAM label. The OAM packet with the OAM payload is sent to the sink.
- the format of the OAM packet is as shown in FIG. 5, and includes an inner label and an OAM label.
- Step S203 After the OAM file arrives at the sink end, the sink end indexes the defective LSP according to the LSP identified by the inner layer label in the OAM packet.
- the sink can send a BDI packet to the source through the exclusive reverse LSP.
- the source can index the forward LSP that is defective according to the outer label carried in the BDI packet, and take corresponding switching measures. , to achieve OAM function.
- the sink can also send a BDI packet to the source through the shared reverse LSP.
- the format of the BDI packet is the same as the format of the OAM packet, and the inner label of the forward LSP needs to be carried. According to the inner label carried in the BDI packet, the terminal can know which forward LSP is faulty, and accordingly take corresponding switching measures, so that the OAM function can be implemented.
- the label stacking technology separates the forwarding function from the indexing function, and the outer label acts as a forwarding function, and is only responsible for the OAM packet at the source end and the sink end.
- the transfer between the inner tags is responsible for identifying the unique forward LSP. Therefore, in the case of PHP, after the outer-label is popped up in the penultimate hop of the LSP path, there is also an inner-layer label that identifies the forward LSP, so it does not affect the LSP where the sink index is defective.
- the third embodiment provided by the present invention is a method for using a label index label switching path, which is capable of supporting OAM in the case of sharing a reverse channel.
- the specific implementation process of this embodiment is shown in FIG. 6, and includes:
- Step S301 The source end sends an OAM packet.
- the format of the OAM message may be in the format of the prior art, or the formats in the first embodiment and the second embodiment may be used.
- Step S302 When the OAM packet arrives at the sink end, the sink end indexes the defective LSP according to the OAM packet.
- the sink end may index the defective LSP according to the method in the prior art, or may index the defective LSP according to the methods in the first embodiment and the second embodiment.
- Step S303 After the sink index is indexed, the BDI file is sent to the source end by using the shared reverse channel, and the BDI file carries an OAM label and an inner label for identifying the forward LSP.
- the format of the BDI packet is the same as that of the OAM packet in the first embodiment, and includes an outer label and an OAM label, and an inner label disposed between the outer label and the OAM label.
- the outer label may be an MPLS label for forwarding.
- the inner label is used to identify the forward LSP.
- the OAM label may be an OAM packet with a label of 14.
- Step S304 When the BDI packet arrives at the source end, the source end indexes the defective LSP according to the LSP identified by the inner layer label carried by the BDI packet.
- the label stack technology is used to separate the forwarding function from the index function, and the outer label serves as a forwarding function.
- the inner label is indexed and is responsible for identifying the forward LSP where the defect occurs. Therefore, when the BDI packet arrives at the source end, the source end can index the LSP that is defective according to the inner label, so as to obtain corresponding switching measures, so that the OAM function can be implemented.
- a fourth embodiment of the present invention provides a system for using a label to index a multi-label switching path, including: a transmitting end and a receiving end.
- the system may further include a sink node or a penultimate hop node Or both the aggregation node and the penultimate hop node.
- the transmitting end may be a source end that sends an OAM ⁇ ⁇ message through a forward LSP, and the corresponding receiving end may be a sink end that receives the 0 AM message.
- the sending end sends an OAM packet, where the OAM packet carries an OAM label, and an inner label that is only used to identify the forward label switching path LSP.
- the aggregation node is configured to map the outer label carried in the OAM packet to an outgoing label, and use the outgoing label as an outer label of the OAM packet, and keep the internal label.
- the layer label is unchanged, and the OAM packet is sent out.
- the penultimate hop node is configured to: after the OAM packet arrives, determine, according to the outer label of the OAM packet, that the OAM packet carrying the inner label is sent after receiving the OAM packet.
- the receiving end according to the inner label index in the arrived OAM packet, has a defect positive
- the transmitting end may be a sink that sends a BDI packet by using a shared reverse LSP, and the corresponding receiving end is a source that receives the BDI packet.
- the sending end sends a BDI packet, where the packet carries an operation and maintenance management OAM label, and an inner label that is only used to identify the forward label switching path LSP;
- the receiving end according to the inner label index in the BDI packet that arrives, the defect is positive.
- a fifth embodiment of the present invention provides a source end, including: an obtaining unit and an index unit.
- An acquiring unit which receives a reverse defect notification BDI packet sent by the shared reverse LSP, where the BDI packet carries an OAM label, and an inner label used to identify the forward LSP;
- a sixth embodiment of the present invention further provides another source, comprising: a construction unit and a transmission unit.
- the construction unit, the OAM packet is configured to carry the OAM label, and the inner layer label is used to identify the forward LSP.
- the specific implementation process is the same as that in the method embodiment, and is not described in detail here.
- the transmission unit sends the packet constructed by the message construction unit through the LSP.
- a seventh embodiment of the present invention provides a sink, which includes: a message acquiring unit and a path indexing unit.
- the packet obtaining unit receives the OAM packet, and the packet carries an OAM label and an inner label for identifying the forward label switching path LSP.
- the seventh embodiment of the present invention further provides another sink, which includes: a message construction unit and a message transmission unit.
- the message construction unit constructs a reverse defect notification BDI packet, so that the packet carries an OAM label and an inner layer label for identifying a forward LSP with a defect; the specific implementation process is similar to the related description in the method embodiment. , will not be described in detail here.
- the message transmission unit sends the packet constructed by the message construction unit by sharing the reverse LSP.
- the LSP of the inner layer label index between the outer label and the OAM label is defective, so that the defect can be indexed according to the label in the received message.
- LSP which can support the OAM function in the case of shared reverse channel, mp2p LSP and PHP, and increases the application range of the label index.
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Abstract
L'invention concerne un procédé, un système, une extrémité de source et une extrémité de destination pour indexer le Trajet de Commutation d'Etiquettes (LSP) au moyen d'une étiquette. Dans la présente invention, un message est reçu. Le message transporte l'étiquette d'Exploitation, Administration et Maintenance (OAM) et une étiquette de couche interne pour identifier le LSP aller. Le LSP aller avec une défaillance est indexé conformément à l'étiquette de couche interne. En conséquence, selon la présente invention, dans le cas où le canal retour est partagé, LSP Multipoint à Point (Mp2p) ou Suppression à l'Avant-dernier Saut (PHP), l'extrémité qui a reçu le message peut indexer le LSP aller avec défaillance conformément à l'étiquette portée dans le message. Il est ainsi possible de supporter la fonctionnalité OAM dans le cas du canal retour partagé, LSP Mp2p ou PHP, de façon à étendre le domaine d'application de l'indexation d'étiquette.
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CN200710136317.8A CN101075973A (zh) | 2007-07-13 | 2007-07-13 | 使用标签索引标签交换路径的方法、系统、源端和宿端 |
CN200710136317.8 | 2007-07-13 |
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Cited By (2)
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CN102487477A (zh) * | 2010-12-01 | 2012-06-06 | 中兴通讯股份有限公司 | 实现camel3或4业务的方法和系统 |
CN111934943A (zh) * | 2014-12-30 | 2020-11-13 | 华为技术有限公司 | 位转发入口路由器、位转发路由器及操作管理维护检测方法 |
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CN101075973A (zh) * | 2007-07-13 | 2007-11-21 | 华为技术有限公司 | 使用标签索引标签交换路径的方法、系统、源端和宿端 |
CN102752128B (zh) * | 2012-04-19 | 2015-07-08 | 杭州华三通信技术有限公司 | 一种mpls te隧道故障检测方法及其设备 |
US9692693B2 (en) * | 2014-06-30 | 2017-06-27 | Juniper Networks, Inc. | Bandwidth control for ring-based multi-protocol label switched paths |
US10218611B2 (en) | 2014-06-30 | 2019-02-26 | Juniper Networks, Inc. | Label distribution protocol (LDP) signaled multi-protocol label switching rings |
CN108494474A (zh) * | 2018-03-23 | 2018-09-04 | 烽火通信科技股份有限公司 | 利用oam报文实现业务叠加保护倒换的方法及系统 |
US11233748B1 (en) | 2018-08-30 | 2022-01-25 | Juniper Networks, Inc. | Bandwidth management for resource reservation label switched path of a ring network |
EP4030698A4 (fr) | 2019-10-14 | 2022-11-09 | Huawei Technologies Co., Ltd. | Procédé, dispositif, système et appareil de traitement de paquets, et support de stockage |
CN112737954B (zh) * | 2019-10-14 | 2022-09-23 | 华为技术有限公司 | 报文处理方法、装置、系统、设备及存储介质 |
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CN111934943A (zh) * | 2014-12-30 | 2020-11-13 | 华为技术有限公司 | 位转发入口路由器、位转发路由器及操作管理维护检测方法 |
CN111934943B (zh) * | 2014-12-30 | 2024-05-03 | 华为技术有限公司 | 位转发入口路由器、位转发路由器及操作管理维护检测方法 |
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