CN108123875B - Bidirectional forwarding detection method and device - Google Patents
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- 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]
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- 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
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- H—ELECTRICITY
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Abstract
The invention discloses a bidirectional forwarding detection method and a bidirectional forwarding detection device, relates to the technical field of communication, and aims to solve the problems that BFD negotiation and detection processes are complex and system resources are wasted in the prior art. The method comprises the following steps: the first node and the second node respectively establish respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP; the first node and the second node respectively send negotiation messages to each other through the BFD session established by the first node and the second node; the first node and the second node respectively match the BFD session established by the first node and the BFD session established by the second node with the BFD session established by the other node according to the received negotiation messages so as to carry out BFD negotiation; and under the condition of consistent BFD negotiation, the first node and the second node respectively send detection messages to the opposite side to carry out corresponding path detection.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a bidirectional forwarding detection method and apparatus.
Background
BFD (Bidirectional Forwarding Detection) is an international standard protocol for realizing fast Detection, and provides a Detection method with light load and short duration, which can be used for fast Detection of LSP (Label Switching Path).
RFC5884 defines the working mode of LSP BFD, where a tunnel Ingress node serves as a BFD active end, and first sends an LSP Ping message to an Egress node, and brings an LD (Local Discriminator) of BFD to the Egress node. And analyzing the LSP Ping message by the Egress node to passively create a BFD session. And then the BFD passively created by the Egress node sends a BFD message to the Ingress node for negotiation.
In this way, the LSP Ping technology needs to be introduced at the LSP BFD link establishment stage, and the LSP Ping packet is sent first, so that the BFD session of the Egress node can be established for BFD negotiation and detection, which is tedious in process and wastes valuable system resources.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a bidirectional forwarding detection method and device, so as to solve the problems of complex BFD negotiation and detection procedures and waste of system resources in the prior art.
In one aspect, the present invention provides a bidirectional forwarding detection method for a bidirectional LSP, including: the first node and the second node respectively establish respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP; the first node and the second node respectively send negotiation messages to each other through the BFD session established by the first node and the second node; the first node and the second node respectively match the BFD session established by the first node and the BFD session established by the second node with the BFD session established by the other node according to the received negotiation messages so as to carry out BFD negotiation; and under the condition of consistent BFD negotiation, the first node and the second node respectively send detection messages to the opposite side to carry out corresponding path detection.
Optionally, the negotiation packet carries a label of the detected path.
Optionally, the matching, by the first node and the second node, the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet respectively includes: and the first node and the second node search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to labels carried in the received negotiation messages, or determine corresponding LSP information according to a preset functional relationship, and search corresponding BFD sessions locally according to the LSP information.
Optionally, the negotiation packet carries destination session configuration information of the negotiation packet.
Optionally, the matching, by the first node and the second node, the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet respectively includes: and the first node and the second node locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
Further, before the first node and the second node respectively send detection packets to each other for performing corresponding path detection, the method further includes: and the first node and the second node respectively establish a binding relationship with each detected path and each standby path.
Further, the method further comprises: and if the first node or the second node does not receive the detection message sent by the other side within the preset time, determining that the corresponding detected path has a fault, and switching the communication path between the first node and the second node into a corresponding standby path.
In another aspect, the present invention further provides a bidirectional forwarding detection apparatus for a bidirectional LSP, including: a creating unit, configured to enable a first node and a second node to respectively create respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP; a sending unit, configured to enable the first node and the second node to send negotiation packets to each other through the BFD sessions respectively created by the first node and the second node; a matching unit, configured to enable the first node and the second node to respectively match the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet, so as to perform BFD negotiation; and the detection unit is used for enabling the first node and the second node to respectively send detection messages to the other side to perform corresponding path detection under the condition that BFD negotiation is consistent.
Optionally, the negotiation packet carries a label of the detected path.
Optionally, the matching unit is specifically configured to: and enabling the first node and the second node to search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to the labels carried in the received negotiation messages, or determining the corresponding LSP information according to a preset functional relationship, and locally searching the corresponding BFD session according to the LSP information.
Optionally, the negotiation packet carries destination session configuration information of the negotiation packet.
Optionally, the matching unit is specifically configured to: and enabling the first node and the second node to locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
Further, the apparatus further includes a binding unit, configured to establish a binding relationship between the first node and the second node and each detected path and the backup path, respectively, before the first node and the second node respectively send a detection packet to the other node to perform corresponding path detection.
Further, the apparatus further includes a switching unit, configured to determine that a corresponding detected path fails if the first node or the second node does not receive the detection packet sent by the other node within a preset time, and switch a communication path between the first node and the second node to a corresponding backup path.
The bidirectional forwarding detection method and device for bidirectional LSP provided by the embodiments of the present invention, when creating bidirectional forwarding detection session, the first node and the second node at both ends of the link respectively carry out session creation, and respectively send negotiation messages to the opposite side through the BFD sessions created respectively, and respectively matching the BFD session created by itself with the BFD session created by the other party according to the received negotiation messages to carry out BFD negotiation, under the condition of BFD negotiation consistency, the first node and the second node respectively send detection messages to each other to carry out corresponding path detection, thus, the two nodes are operated according to the same working mode without distinguishing the active end and the passive end and the interaction of LSP Ping, therefore, BFD establishing and negotiating processes are effectively simplified, technical implementation difficulty is reduced, and system resources are saved.
Drawings
Fig. 1 is a flowchart of a bidirectional forwarding detection method for a bidirectional LSP according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system on which a bidirectional forwarding detection method for a bidirectional LSP is based in an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a system on which a bidirectional forwarding detection method for a bidirectional LSP is based in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a bidirectional forwarding detection apparatus for a bidirectional LSP according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, an embodiment of the present invention provides a bidirectional forwarding detection method for a bidirectional LSP, including:
s11, the first node and the second node respectively create respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP;
s12, the first node and the second node respectively send negotiation messages to each other through the BFD session respectively established by the first node and the second node;
s13, the first node and the second node match the BFD session created by the first node and the BFD session created by the second node according to the received negotiation messages respectively so as to carry out BFD negotiation;
s14, in case of consistent BFD negotiation, the first node and the second node respectively send detection packets to each other for corresponding path detection.
The bidirectional forwarding detection method for bidirectional LSP provided by the embodiments of the present invention, when creating a bidirectional forwarding detection session, the first node and the second node at both ends of the link respectively carry out session creation, and respectively send negotiation messages to the opposite side through the BFD sessions created respectively, and respectively matching the BFD session created by itself with the BFD session created by the other party according to the received negotiation messages to carry out BFD negotiation, under the condition of BFD negotiation consistency, the first node and the second node respectively send detection messages to each other to carry out corresponding path detection, thus, the two nodes are operated according to the same working mode without distinguishing the active end and the passive end and the interaction of LSP Ping, therefore, BFD establishing and negotiating processes are effectively simplified, technical implementation difficulty is reduced, and system resources are saved.
Specifically, in step S11, the first node and the second node may be two end points of the path to be detected, the first node and the second node are connected by at least one bidirectional LSP, and bidirectional forwarding detection may be performed on any bidirectional LSP connected between the first node and the second node. In order to improve the efficiency of creating the session, each node in the embodiment of the present invention can create a respective BFD session, thereby omitting the interaction process of LSP Ping.
After the two nodes create the BFD sessions, the two nodes may attempt to communicate through the created BFD sessions, for example, in step S12, the first node and the second node may send negotiation packets to each other through the created BFD sessions, respectively. Optionally, the negotiation packet may carry a label of the detected path. After the first node or the second node receives the negotiation message sent by the other party, the label of the detected path carried in the negotiation message can be analyzed.
Optionally, in step S13, the step of the first node and the second node respectively matching the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet may include: and the first node and the second node search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to the labels carried in the received negotiation messages, or determine corresponding LSP information according to a preset functional relationship, and search corresponding BFD session locally according to the LSP information.
Specifically, the label of the detected path has a certain mapping relation with the detected label switched path information, and the mapping relation has corresponding records in the first node and the second node. Therefore, when the first node receives the negotiation packet of the second node, the label carried in the negotiation packet can be obtained, then the label switching path LSP information corresponding to the label is searched in the mapping table between the local label of the first node and the route, and the corresponding BFD session is searched locally according to the LSP information, so that the BFD session established locally at the first node is matched with the BFD session established at the second node.
Similarly, the second node also executes the operation corresponding to the first node, and can also find the LSP information corresponding to the label of the detected path received by the second node in the mapping table between the local label of the second node and the route, and locally find the corresponding BFD session according to the LSP information, thereby matching the BFD session locally established by the second node with the BFD session established by the first node.
Optionally, the mapping relationship between the label and the LSP information may be presented in the form of a label routing mapping table, or in the form of a functional relationship such as a formula, and after acquiring the corresponding label, the first node and the second node may determine the corresponding LSP information according to the functional relationship. The embodiments of the present invention are not limited thereto.
In the above embodiment, the corresponding LSP information is mainly obtained by negotiating the label of the detected path carried in the packet, and the corresponding BFD session is locally searched according to the LSP information. Embodiments of the invention are not limited thereto. In another embodiment of the present invention, in step S12, the negotiation packet sent by the first node and the second node to the peer may further carry destination session configuration information of the negotiation packet, and in step S13, the matching, by the first node and the second node, the BFD session created by the first node and the BFD session created by the peer respectively according to the received negotiation packet may specifically include: and the first node and the second node locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
Optionally, the destination session configuration information may indicate which BFD session (Local descriptor) the negotiation packet comes from, and which BFD session (Remote descriptor) the destination address is. Through the direct designation mode, the first node and the second node can directly find the corresponding BFD session according to the target session configuration information, so that under the scene of the next last hop popping (PHP), the problem that the BFD cannot be inquired according to the label after the label is popped can be conveniently solved through statically designating the Local Discriminator and the Remote Discriminator.
In order to enable the first node and the second node to perform bidirectional forwarding detection on each detected path and to timely process when a failure occurs in a certain path is detected, before the step S14 in which the first node and the second node respectively send detection packets to each other to perform corresponding path detection, the bidirectional forwarding detection method provided in the embodiment of the present invention may further include: and the first node and the second node respectively establish a binding relationship with each detected path and each standby path. If the first node or the second node does not receive the detection message sent by the other side within the preset time, determining that the corresponding detected path has a fault, and switching the communication path between the first node and the second node to a corresponding standby path.
The following describes in detail a bidirectional forwarding detection method for a bidirectional LSP according to a specific embodiment of the present invention.
As shown in fig. 2, the bidirectional forwarding detection method for bidirectional LSP provided in this embodiment includes:
step 1: two bidirectional LSPs are created: LSP1(R1-R2-R3-R4) and LSP2(R1-R5-R6-R4) form a protection relation, LSP1 is the main, and LSP2 is the spare;
step 2: on an R1 node, establishing BFD1 according to LSP1, establishing BFD3 according to LSP2, sending BFD control message on LSP1 by BFD1, and sending BFD control message on LSP2 by BFD 3;
optionally, as shown in fig. 3, in a PHP scenario, destination session configuration information may be carried in a negotiation packet (e.g., a BFD control packet), and a Local descriptor and a Remote descriptor are statically specified when a BFD is created; for example, in BFD1, Ld ═ 1, rd ═ 2, i.e., the home terminal is identified as 1, and the opposite terminal is identified as 2, and in BFD2, Ld ═ 2, rd ═ 1, i.e., the home terminal is identified as 2, and the opposite terminal is identified as 1, that is, BFD1 and BFD2 are matched as a pair.
And step 3: on an R4 node, establishing BFD2 according to LSP1, establishing BFD4 according to LSP2, sending BFD control message on LSP1 by BFD2, and sending BFD control message on LSP2 by BFD 4;
and 4, step 4: the R1 and R4 nodes store the associated information of the incoming label and the LSP, when the R1 receives the message sent by the BFD2, if the Remote distributor in the message is not 0, the session is inquired according to the Remote distributor; if the Remote Discriminator is 0, inquiring LSP information according to the label, finding BFD1 corresponding to the LSP, and carrying out corresponding processing on the R4 node in the same way to complete the negotiation of BFD1 and BFD2, BFD3 and BFD 4;
and 5: when LSP1 breaks down, BFD1 and BFD2 detect down, trigger protection switching, and switch the flow to LSP 2.
Correspondingly, as shown in fig. 4, an embodiment of the present invention further provides a bidirectional forwarding detection apparatus for a bidirectional LSP, including:
a creating unit 41, configured to enable the first node and the second node to create respective bidirectional forwarding detection BFD sessions respectively; wherein the first node and the second node are connected by at least one bidirectional LSP;
a sending unit 42, configured to enable the first node and the second node to send negotiation packets to each other through the BFD sessions respectively created by the first node and the second node;
a matching unit 43, configured to enable the first node and the second node to respectively match the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet, so as to perform BFD negotiation;
a detecting unit 44, configured to, in a case that the BFD negotiation is consistent, enable the first node and the second node to send detection packets to each other, respectively, so as to perform corresponding path detection.
Embodiments of the present invention provide a bidirectional forwarding detection apparatus for a bidirectional LSP that, when creating a bidirectional forwarding detection session, the first node and the second node at both ends of the link respectively carry out session creation, and respectively send negotiation messages to the opposite side through the BFD sessions created respectively, and respectively matching the BFD session created by itself with the BFD session created by the other party according to the received negotiation messages to carry out BFD negotiation, under the condition of BFD negotiation consistency, the first node and the second node respectively send detection messages to each other to carry out corresponding path detection, thus, the two nodes are operated according to the same working mode without distinguishing the active end and the passive end and the interaction of LSP Ping, therefore, BFD establishing and negotiating processes are effectively simplified, technical implementation difficulty is reduced, and system resources are saved.
Optionally, the negotiation packet carries a label of the detected path.
Optionally, the matching unit 43 may be specifically configured to: and enabling the first node and the second node to search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to the labels carried in the received negotiation messages, or determining the corresponding LSP information according to a preset functional relationship, and locally searching the corresponding BFD session according to the LSP information.
Optionally, the negotiation packet carries destination session configuration information of the negotiation packet.
Optionally, the matching unit 43 may be specifically configured to: and enabling the first node and the second node to locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
Further, the bidirectional forwarding detection apparatus for a bidirectional LSP provided in the embodiment of the present invention may further include a binding unit, configured to establish a binding relationship between the first node and the second node and each detected path and the backup path, respectively, before the first node and the second node respectively send a detection packet to each other to perform corresponding path detection.
Further, the bidirectional forwarding detection apparatus for a bidirectional LSP may further include a switching unit, configured to determine that a corresponding detected path fails if the first node or the second node does not receive the detection packet sent by the other node within a preset time, and switch a communication path between the first node and the second node to a corresponding backup path.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (14)
1. A bidirectional forwarding detection method for a bidirectional LSP, comprising:
the first node and the second node respectively establish respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP;
the first node and the second node respectively send negotiation messages to each other through the BFD session established by the first node and the second node;
the first node and the second node respectively match the BFD session established by the first node and the BFD session established by the second node with the BFD session established by the other node according to the received negotiation messages so as to carry out BFD negotiation;
and under the condition of consistent BFD negotiation, the first node and the second node respectively send detection messages to the opposite side to carry out corresponding path detection.
2. The method of claim 1, wherein the negotiation message carries a label for the detected path.
3. The method according to claim 2, wherein the first node and the second node respectively match the BFD session created by the first node with the BFD session created by the other node according to the received negotiation packet comprises:
and the first node and the second node search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to labels carried in the received negotiation messages, or determine corresponding LSP information according to a preset functional relationship, and search corresponding BFD sessions locally according to the LSP information.
4. The method of claim 1, wherein the negotiation packet carries destination session configuration information of the negotiation packet.
5. The method according to claim 4, wherein the first node and the second node respectively match the BFD session created by the first node with the BFD session created by the other node according to the received negotiation packet comprises:
and the first node and the second node locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
6. The method according to any one of claims 1 to 5, wherein before the first node and the second node respectively send a detection packet to each other for performing corresponding path detection, the method further comprises:
and the first node and the second node respectively establish a binding relationship with each detected path and each standby path.
7. The method of claim 6, further comprising:
and if the first node or the second node does not receive the detection message sent by the other side within the preset time, determining that the corresponding detected path has a fault, and switching the communication path between the first node and the second node into a corresponding standby path.
8. A bidirectional forwarding detection apparatus for a bidirectional LSP, comprising:
a creating unit, configured to enable a first node and a second node to respectively create respective Bidirectional Forwarding Detection (BFD) sessions; wherein the first node and the second node are connected by at least one bidirectional LSP;
a sending unit, configured to enable the first node and the second node to send negotiation packets to each other through the BFD sessions respectively created by the first node and the second node;
a matching unit, configured to enable the first node and the second node to respectively match the BFD session created by the first node and the BFD session created by the second node according to the received negotiation packet, so as to perform BFD negotiation;
and the detection unit is used for enabling the first node and the second node to respectively send detection messages to the other side to perform corresponding path detection under the condition that BFD negotiation is consistent.
9. The apparatus of claim 8, wherein the negotiation message carries a label for the detected path.
10. The apparatus according to claim 9, wherein the matching unit is specifically configured to:
and enabling the first node and the second node to search corresponding Label Switching Path (LSP) information in a preset label routing mapping table according to the labels carried in the received negotiation messages, or determining the corresponding LSP information according to a preset functional relationship, and locally searching the corresponding BFD session according to the LSP information.
11. The apparatus according to claim 8, wherein the negotiation packet carries destination session configuration information of the negotiation packet.
12. The apparatus according to claim 11, wherein the matching unit is specifically configured to:
and enabling the first node and the second node to locally search corresponding BFD (bidirectional forwarding detection) sessions according to the target session configuration information carried in the received negotiation messages.
13. The apparatus according to any one of claims 8 to 12, further comprising a binding unit, configured to establish a binding relationship between the first node and the second node and each detected path and each backup path, respectively, before the first node and the second node send a detection packet to each other for performing corresponding path detection.
14. The apparatus according to claim 13, further comprising a switching unit, configured to determine that a corresponding detected path fails if the first node or the second node does not receive the detection packet sent by the other node within a preset time, and switch a communication path between the first node and the second node to a corresponding backup path.
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| CN101771577B (en) * | 2008-12-31 | 2012-10-17 | 华为技术有限公司 | Method, system and equipment for establishing bidirectional forwarding detection (BFD) for bidirectional LSP |
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