WO2012171382A1 - Loopback detection method and system - Google Patents

Abstract

A loopback detection method and system can realize the OAM loopback detection function of the Ethernet in an ECMP scenario. The method includes: a source maintenance end point sending a loopback message to a destination maintenance point, the loopback message including the flow identifier corresponding to a designated transmission path in a plurality of equivalent transmission paths to the destination maintenance point; the destination maintenance point sending a loopback reply message to the source maintenance end point after receiving the loopback message, the loopback reply message including the flow identifier corresponding to a reverse common-path transmission path to the source maintenance end point; and the source maintenance end point returning a notification that the loopback detection has succeeded after receiving the loopback reply message and there having been no error in detection.

Description

 Loopback detection method and system

Technical field

 The present invention relates to the field of communications technologies, and in particular, to a loopback detection method and system.

Background technique

 In current Ethernet, the Institute of Electrical and Electronics Engineers (IEEE) has developed a working mechanism for Ethernet Operation, Administration and Maintenance (0AM), and It was officially released as the 802. lag standard in 2007.

 The IEEE 802. lag standard defines OAM functional entities in Ethernet, including Maintenance End Point (MEP) located at both ends of the Ethernet transmission path, and Maintenance Intermediate Point located in the middle of the Ethernet transmission path. , referred to as MIP). The maintenance node and the maintenance intermediate point are collectively referred to as a maintenance point (MP).

 Each switch (Switch, or SW for short) in Ethernet can create MPs based on ports. Loopback detection is one of the Ethernet OAM functions defined by the IEEE 802. lag standard. This function runs from MEP to MEP or MEP to MIP to detect connection failures of the entire or a segment of the Ethernet transmission path.

 Figure 1 is a schematic diagram of a loopback detection mechanism defined by the existing IEEE 802.1ag standard. As shown in Figure 1, the existing Ethernet loopback detection mechanism includes the following main steps:

 Step 1: After the loopback detection function is enabled, the MEP sends a loopback message (LoopBack Message, LBM for short) to the MIP or the peer MEP. The message reaches the destination MIP or MEP along the fixed single path.

 Step 2: After receiving the loopback message and detecting the error, the destination MIP or the MEP sends a loopback reply (LBR) to the source MEP that sends the loopback message, and the message arrives at the source MEP along the reverse fixed single path. .

Step 3: After receiving the loopback response and detecting the error, the source MEP that sends the loopback message returns an announcement to the operator that the loopback detection succeeds. The IEEE 802.1Qb project is working on the Equal Cost Multi-Path (ECMP) mechanism to implement load balancing of service traffic on equal-cost multipaths and improve link utilization in Ethernet. The 802.1Qbp project specifies that for an Ethernet supporting equivalent multipath, the network edge switch shall assign a forwarding label F-tag to the Ethernet frame entering the network. When the Ethernet frame of the F-tag leaves the network, the network edge The switch strips the F-tag carried by the Ethernet frame.

 Figure 2 depicts the specific encapsulation format of the forwarding label F-tag specified by the IEEE 802.1Qbp project. As shown in FIG. 2, the forwarding label F-tag includes a 16-bit Tag Protocol ID (TPID), a 3-bit Priority Code Point (PCP), and a 1-bit discard identifier. Drop Eligible (DE), 6-bit Reserved Field (Reset), 6-bit Time To Live (TTL), and 16-bit Flow ID. The 16-bit flow identifier is used to offload traffic entering the network. Different flow identifiers correspond to different equal-cost paths. Each specific flow identifier is used to select an equal-cost multi-path between the source node and the destination node. a specific path.

 Through the above analysis, it can be found that the loopback detection function defined by the published IEEE 802. lag standard is only applicable to the case where there is only one Ethernet transmission path between two maintenance points running the function, and it is not applicable to two cases. There are cases of equivalent multipath between maintenance points. With the development of the IEEE 802.1Qbp standard project and the development of related standards, Ethernet will support the ECMP function. Therefore, the existing Ethernet OAM working mechanism needs to be extended to support the Ethernet OAM requirements in the ECMP scenario. Summary of the invention

 The technical problem to be solved by the present invention is to provide a loopback detection method and system, which can implement the Ethernet OAM loopback detection function in an ECMP scenario.

 To solve the above technical problem, an embodiment of the present invention provides a loopback detection method, which is applied to an Ethernet supporting an equal-cost multipath, and the method includes:

The source maintenance end node sends a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to a specified one of the plurality of equal-cost transmission paths of the destination maintenance point; After receiving the loopback message, the destination maintenance point sends a loopback response message to the source maintenance end node, where the loopback response message includes a reverse common path transmission path to the source maintenance end node. Corresponding stream identifier;

 After receiving the loopback response message and detecting the error, the source maintenance end node returns an announcement of successful loopback detection.

 Optionally, the source maintenance end node determines, according to one of the following information input by the operator or any combination thereof, the flow identifier corresponding to the specified transmission path:

 Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.

 Optionally, after receiving the loopback message, the destination maintenance point determines the specified transmission path according to the flow identifier included therein, and calculates a flow identifier corresponding to the reverse unidirectional transmission path. And sending a loopback response message to the source maintenance end node, and including, in the loopback response message, a flow identifier corresponding to the reverse common path transmission path;

 The reverse multiplex transmission path means that the node through which the reverse transmission path passes is completely consistent with the maintenance point passed by the forward transmission path.

 Optionally, the source maintenance end node includes the flow identifier corresponding to the specified transmission path in the loopback message by:

 The source maintenance end node carries a forwarding label in the loopback message, and the flow label corresponding to the specified transmission path is included in the forwarding label.

 Optionally, the source maintenance end node receives the loopback response message and the detection is correct, and specifically includes:

 After receiving the loopback response message, the maintenance end node determines a transmission path of the loopback response message according to the flow identifier included therein, and determines whether the transmission path sends the ring with the source maintenance end node. The specified transmission path selected when the message is returned is common. If yes, it is determined that the detection is correct. If not, the detection failure is determined, and the notification of the loopback detection failure is returned.

An embodiment of the present invention further provides a loopback detection system, which is applied to an Ethernet supporting an equivalent multipath, and the system includes: a transmission path determining unit, a loopback message sending unit, and a loopback in a source maintenance end node Detection unit; a loopback response unit in the destination maintenance point, The transmission path determining unit is configured to determine a specified transmission path from a plurality of equal-cost transmission paths to the destination maintenance point;

 The loopback message sending unit is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specified transmission path;

 The loopback response unit is configured to: after receiving the loopback message, send a loopback response message to the source maintenance end node, where the loopback response message includes a reverse total to the source maintenance end node. The stream identifier corresponding to the path of the path;

 The loopback detection unit is configured to, after receiving the loopback response message and detecting the error, return an announcement that the loopback detection is successful.

 Optionally, the loopback message sending unit is further configured to: determine, according to one of the following information input by the operator or any combination thereof, a flow identifier corresponding to the specified transmission path, and include the loopback message in the loopback message The flow identifier corresponding to the specified transmission path:

 Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.

 Optionally, the loopback message sending unit is configured to include the flow identifier corresponding to the specified transmission path in the loopback message by:

 The loopback message carries a forwarding label, and the flow label corresponding to the specified transmission path is included in the forwarding label.

 Optionally, the loopback response unit is configured to: after receiving the loopback message, determine the specified transmission path according to the flow identifier included therein, and calculate the reverse common path After the corresponding flow identifier, the loopback response message is sent to the source maintenance end node, and the loop identifier corresponding to the reverse common path transmission path is included in the loopback response message;

 The reverse multiplex transmission path means that the node through which the reverse transmission path passes is completely consistent with the maintenance point passed by the forward transmission path.

Optionally, the loopback detection unit is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path is related to the The specified transmission path is selected when the source maintenance end node sends the loopback message, and if yes, it is determined that the detection is correct, if not, the detection fails, and the loopback detection is returned. Notice of defeat.

 The embodiment of the present invention further provides a source maintenance end node, which is applied to the loopback detection of the Ethernet supporting the equivalent multipath, where the source maintenance end node includes: a transmission path determining unit, a loopback message sending unit, and a ring. Back detection unit, wherein

 The transmission path determining unit is configured to determine a specified transmission path from a plurality of equivalent transmission paths to the destination maintenance point;

 The loopback message sending unit is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specified transmission path;

 The loopback detection unit is configured to: after receiving the loopback response message returned by the destination maintenance point, and returning the loopback detection success after returning the loopback detection message; the loopback response message includes the source maintenance end node The flow identifier corresponding to the reverse multiplex path.

 Optionally, in the source maintenance node,

 The loopback message sending unit is further configured to: determine, according to any combination of one or more of the following information input by the operator, a flow identifier corresponding to the specified transmission path, and include the The stream ID corresponding to the specified transmission path:

 Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.

 Optionally, in the source maintenance node,

 The loopback message sending unit is configured to include, in the loopback message, a stream identifier corresponding to the specified transmission path by:

 The loopback message carries a forwarding label, and the flow label corresponding to the specified transmission path is included in the forwarding label.

 Optionally, in the source maintenance node,

 The loopback response message includes a flow identifier corresponding to the reverse common path, where the node through which the reverse common path passes is completely consistent with the maintenance point of the specified transmission path. .

Optionally, in the source maintenance node, The loopback detection unit is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path is related to the source maintenance end The designated transmission path selected when the node sends the loopback message is common. If yes, it determines that the detection is correct. If not, determines that the detection fails, and returns an announcement that the loopback detection fails. The embodiment of the present invention further provides a network node, which is applied to loopback detection of an Ethernet supporting equivalent multipath, including a loopback response unit.

 The loopback response unit is configured to receive a loopback message sent by the source maintenance end node, and send a loopback response message to the source maintenance end node;

 The loopback message includes a flow identifier corresponding to the specified transmission path, where the specified transport path is a one determined by the source maintenance end node from multiple equal-cost transmission paths to the destination maintenance point. The specified transmission path, where the loopback response message includes a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node.

 Optionally, in the foregoing network node,

 The loopback response unit is configured to: after receiving the loopback message, determine the specified transmission path according to the flow identifier included therein, and calculate a flow corresponding to the reverse common path transmission path After the identifier is sent, the loopback response message is sent to the source maintenance end node, and the loop identifier corresponding to the reverse common path transmission path is included in the loopback response message;

 The node through which the reverse multiplex transmission path passes is completely consistent with the maintenance point that the designated transmission path passes.

The solution of the foregoing embodiment extends the working mechanism of the Ethernet loopback detection specified by the IEEE 802.1ag standard, so that the function can be applied to the Ethernet supporting ECMP specified by the IEEE 802.1Qb project, and is specified for one of the multiple equal cost paths. The loopback detection is performed on the path, so that an application scenario with equivalent multipath between the two maintenance points can be supported.

BRIEF abstract

The drawings described herein are intended to provide a further understanding of the embodiments of the invention The exemplary embodiments of the present invention and the description thereof are intended to explain the embodiments of the present invention and are not intended to limit the invention. In the drawing:

 Figure 1 is a schematic diagram of a loopback detection process specified by the IEEE 802.1ag standard;

 2 is a schematic diagram of a F-tag encapsulation format of a forwarding label specified by the IEEE 802.1Qb project; FIG. 3 is a schematic flowchart of a loopback detection method according to an embodiment of the present invention; FIG. 4 is a loopback detection process according to Embodiment 1 of the present invention; Schematic diagram

 FIG. 5 is a schematic diagram of a loopback detection process according to Embodiment 2 of the present invention; FIG.

 FIG. 6 is a schematic diagram of a loopback detection system according to an embodiment of the present invention. Preferred embodiment of the invention

 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

 In the embodiment of the present invention, by extending the loopback detection mechanism defined by the IEEE 802. lag standard, a flow-based loopback detection method is proposed, which can implement loopback detection for a specified transmission path in ECMP, and overcomes There is a lack of a mechanism in the prior art for a mechanism for loopback detection for a path specified in ECMP.

 An embodiment of the present invention is a flow-based loopback detection method, which uses the following technical solution: The maintenance end node sends a loopback message to the maintenance intermediate point or the peer maintenance end node, and the loopback message carries the forwarding label F-tag. , which contains a 16-bit stream identifier corresponding to the particular transmission path selected;

 The destination maintenance point (the destination maintenance intermediate point or the destination maintenance end node) receives the loopback message carrying the F-tag, and sends a loopback response to the source maintenance end node. The loopback response carries the forwarding label F-tag, which contains the corresponding a stream identifier of the reverse common path;

 The source maintenance end node receives the loopback response carrying the F-tag, checks the 16-bit stream identifier contained therein, and determines whether it corresponds to the reverse collocated path, and the 16-bit stream identifier is opposite to the reverse collocated path. Correspondence is a necessary condition for the success of this loopback detection.

After the destination maintenance point receives the loopback message, it determines according to the 16-bit stream identifier contained therein. a specific transmission path selected, and calculating a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node; and then the flow identifier of the reverse unidirectional transmission path is included in the maintenance point sent to the source end Loopback response message. The reverse multiplex transmission path means that the node through which the reverse path passes is completely consistent with the node through which the forward transmission path passes.

Based on the above solution, the embodiment of the present invention provides a flow-based loopback detection method. As shown in FIG. 3, the method includes:

 Step 301: The maintenance end node determines the destination maintenance point according to the input of the operator and selects one of the plurality of equivalent transmission paths that reach the destination maintenance point. Here, the information input by the operator includes the identifier of the destination maintenance point. Since the destination maintenance point is based on the switch port, the identifier is generally the Media Access Control (MAC) address of the port where the destination maintenance point is located; The input information further includes an identifier of the specific path selected from the plurality of equal-cost transmission paths to the destination maintenance point, and the identifier may be a direct flow identifier (Flow ID) or an indirect capable of calculating the flow identifier. Other identifiers, including the Equal Cost Tree-Algorithm (ECT-Algorithm) identifier (from 00-80-C2-01 to 00-80-C2-10), or information parameters describing the stream (parameter set) "One or more of source/destination MAC address, source/destination IP address, source/destination port".

 Step 302: The maintenance end node sends a loopback message to the destination maintenance point, and carries the flow identifier corresponding to the selected medium transmission path.

 According to the information input by the operator, the maintenance node sends a loopback message to the destination maintenance point. The message is a unicast Ethernet frame. The destination MAC address is the MAC address of the switch port where the destination maintenance point is located. The source MAC address is the switch where the maintenance node is located. The MAC address of the port. The message also carries a forwarding label F-tag, which contains the flow identifier corresponding to the selected transmission path.

 Step 303: After receiving the loopback message, the destination maintenance point selects the reverse collocated transmission path of the transmission path according to the flow identifier, and calculates a flow identifier corresponding to the reverse unidirectional transmission path.

In this step, after receiving the loopback message sent by the maintenance end node, the destination maintenance point checks the flow identifier carried in the loopback message, and determines which loop path the loopback message is transmitted according to the identifier value. The method may be to perform hash calculation on multiple parameters including the flow identifier. The result of the hash corresponds to the particular transmission path selected. Then, the destination maintenance point calculates the flow identifier of the reverse collocated path corresponding to the specific transmission path. One possible calculation method is to perform inverse hash calculation according to the selected reverse multiplex transmission path.

 Step 304: The destination maintenance point replies to the maintenance end node with a loopback response message, and carries the calculated flow identifier corresponding to the reverse unidirectional transmission path.

 After the destination maintenance point calculates the flow identifier of the corresponding reverse unicast transmission path, it sends a loopback response message to the maintenance end node. The message is a unicast Ethernet frame. The destination MAC address is the MAC address of the switch port where the maintenance node is located. The MAC address is the MAC address of the switch port where the destination maintenance point is located. The message also carries the forwarding label F-tag, which contains the flow identifier corresponding to the reverse common path.

 Step 305: After receiving the loopback response message, the maintenance end node detects the flow identifier and determines whether it corresponds to the reverse multiplex transmission path.

 After receiving the loopback response message replied by the destination maintenance point, the maintenance end node checks the flow identifier carried in the loopback response message, and determines, according to the identifier value, which loopback response message is transmitted along the specific path, and determines the transmission path. Whether it is common to the selected transmission path when the maintenance end node sends the loopback message, and the transmission path is common to the selected transmission path when the maintenance end node sends the loopback message, which is a necessary condition for the loopback detection to be successful.

Embodiment 1

 In this embodiment, the maintenance end node initiates loopback detection to the maintenance intermediate point.

 FIG. 4 is a schematic diagram of a flow-based loopback detection process according to the embodiment. As shown in FIG. 3 and FIG. 4, the process mainly includes the following steps:

 Step 401: MEP1 determines the MIP according to the operator's input and selects one of the two equivalent transmission paths (SW1->SW21->SW3 and SW1->SW22->SW3) that arrive at the MIP.

The information input by the operator includes the MAC address of the MIP, and the identifier of the specific path SW1->SW21->SW3 that reaches the MIP. The identifier may be a direct Flow ID1 or an indirect identifier that can calculate the Flow ID1. , including the ECT-Algorithm logo (from 00-80-C2-01 Go to 00-80-C2-10), or describe the information parameter of Flow (one or more of the parameter set "source/destination MAC address, source/destination IP address, source/destination port").

 Step 402: MEP1 sends a loopback message to the MIP, carrying the flow identifier corresponding to the selected transmission path SW1->SW21 -> SW3.

 According to the information input by the operator, the MEP1 sends a flow-based loopback message to the MIP, the message is a unicast Ethernet frame, the destination MAC address is the MAC address of the MIP, and the source MAC address is the MAC address of the MEP1, and the message carries the forwarding label. F-tag, which contains Flow ID1 corresponding to the selected transmission path SW1->SW21->SW3.

 Step 403: After receiving the loopback message, the MIP selects the reverse common transmission path of the transmission path according to the flow identifier, and calculates a flow identifier corresponding to the reverse common transmission path.

 After receiving the flow-based loopback message sent by the MEP1, the MIP checks the flow identifier carried in the loopback message, and determines that the loopback message is transmitted along the SW1->SW21->SW3 according to the identifier value Flow ID1, and then calculates The flow ID of the reverse unicast path SW3->SW21->SW1 corresponding to the specific transmission path Flow ID2, Flow ID2 and Flow ID1 may be the same or different.

 Step 404: The MIP replies to the MEP1 with a loopback response message, and carries the calculated flow identifier of the corresponding reverse multiplex transmission path.

 The MIP replies to the flow-based loopback response message to the MEP1. The message is a unicast Ethernet frame, the destination MAC address is the MAC address of the MEP1, and the source MAC address is the MAC address of the MIP. The message also carries the forwarding label F-tag, which includes Corresponds to Flow ID2 of the reverse common path transmission path SW3->SW21->SW1.

 Step 405: After receiving the loopback response message, the MEP1 detects the flow identifier and determines whether it corresponds to the reverse multiplex transmission path.

After receiving the flow-based loopback response message sent by the MIP, the MEP1 checks the flow identifier carried in the loopback response message, and determines that the loopback response message is transmitted along SW3->SW21->SW1 according to the identifier value Flow ID2. When the MEP1 sends a loopback message, the selected transmission path SW1->SW21->SW3 is common, and this judgment result is a necessary condition for the loopback detection success. Embodiment 2

 In this embodiment, the maintenance end node initiates loopback detection to the peer maintenance end node.

 FIG. 5 is a schematic diagram of a flow-based loopback detection process according to the embodiment. As shown in FIG. 3 and FIG. 5, the process mainly includes the following steps:

 Step 501: MEP1 determines MEP2 according to the operator's input and selects one of two equivalent transmission paths (SW1->SW21->SW3->SW4 and SW1->SW22->SW3->SW4) to MEP2.

 The information input by the operator includes the MAC address of the MEP2, and also includes the identifier of the specific path SW1->SW22->SW3->SW4 that reaches the MEP2, and the identifier may be a direct Flow ID3, or may be an indirect one that can calculate the Flow ID3. Other identifiers, including the ECT-Algorithm identifier (from 00-80-C2-01 to 00-80-C2-10), or information parameters describing the Flow (parameter set "source/destination MAC address, source/destination IP address" , one or more of the source/destination ports.

 Step 502: MEP1 sends a loopback message to MEP2, carrying the flow identifier corresponding to the selected transmission path SW1->SW22->SW3->SW4.

 According to the information input by the operator, the MEP1 sends a flow-based loopback message to the MEP2, the message is a unicast Ethernet frame, the destination MAC address is the MAC address of the MEP2, and the source MAC address is the MAC address of the MEP1, and the message carries the forwarding label. F-tag, which contains Flow ID3 corresponding to the selected transmission path SW1->SW22->SW3->SW4.

 Step 503: After receiving the loopback message, the MEP2 selects the reverse common transmission path of the transmission path according to the flow identifier, and calculates a flow identifier corresponding to the reverse common transmission path.

 After receiving the flow-based loopback message sent by the MEP1, the MEP2 checks the flow identifier carried in the loopback message, and determines that the loopback message is transmitted along the SW1->SW22->SW3->SW4 according to the identifier value Flow ID3. Then, the flow identifier Flow ID4 corresponding to the reverse symmetry transmission path SW4->SW3->SW22->SW1 of the specific transmission path is calculated, and the flow ID4 and the flow ID3 may be the same or different.

 Step 504: The MEP2 replies to the MEP1 with a loopback response message, and carries the calculated flow identifier of the corresponding reverse multiplex transmission path.

MEP2 replies to MEP1 with a flow-based loopback response message, which is a unicast Ethernet frame, The MAC address is the MAC address of the MEP1, and the source MAC address is the MAC address of the MEP2. The message also carries the forwarding label F-tag, which includes the Flow ID4 corresponding to the reverse symmetry transmission path SW4->SW3->SW22->SW1. .

 Step 505: After receiving the loopback response message, the MEP1 detects the flow identifier and determines whether it corresponds to the reverse multiplex transmission path.

 After receiving the flow-based loopback response message replied by the MEP2, the MEP1 checks the flow identifier carried in the loopback response message, and determines that the loopback response message is transmitted along the SW4->SW3->SW22->SW1 according to the identifier value Flow ID4. When the MEP1 sends a loopback message, the selected transmission path SW1->SW22->SW3->SW4 is common, and this judgment result is a necessary condition for the loopback detection success.

In addition, the embodiment of the present invention further provides a loopback detection system, which is applied to an Ethernet supporting an equivalent multipath. As shown in FIG. 6, the system mainly includes: a transmission path determining unit in the source maintenance end node 601. 6011, a loopback message sending unit 6012 and a loopback detecting unit 6013; a loopback response unit 6021 in the destination maintenance point 602,

 The transmission path determining unit 6011 is configured to determine a specific transmission path from a plurality of equivalent transmission paths to the destination maintenance point;

 The loopback message sending unit 6012 is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specific transmission path;

 The loopback response unit 6021 is configured to: after receiving the loopback message, send a loopback response message to the source maintenance end node, where the loopback response message includes a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node;

 The loopback detection unit 6013 is configured to return a loopback detection success notification after receiving the loopback response message and detecting the error.

 Optionally, the loopback message sending unit 6012 is further configured to: determine, according to one of the following information input by the operator, or any combination thereof, the flow identifier corresponding to the specific transmission path, and include the flow corresponding to the specific transmission path in the loopback message. Logo:

Flow identification, equivalent tree algorithm identification, source/destination media access control (MAC) address, source/destination IP address, source/destination port.

 Optionally, the loopback message sending unit 6012 is configured to include the flow identifier corresponding to the specific transmission path in the loopback message by:

 The loopback message carries a forwarding label, and the forwarding label includes a flow identifier corresponding to a specific transmission path.

 Optionally, the loopback response unit 6021 is configured to: after receiving the loopback message, determine a specific transmission path according to the flow identifier included therein, and calculate a flow identifier corresponding to the reverse unicast transmission path, and then go to the source maintenance end. The node sends a loopback response message, and the loopback response message includes a flow identifier corresponding to the reverse common path.

 The reverse multiplex transmission path means that the node through which the reverse transmission path passes is exactly the same as the maintenance point passed by the forward transmission path.

 Optionally, the loopback detection unit 6013 is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path and the source maintenance end node send a loopback The specific transmission path selected in the message is common. If yes, it is determined that the detection is correct. If not, the detection failure is determined, and the notification of the loopback detection failure is returned.

 The embodiment of the present invention further provides a source maintenance end node, which is applied to the loopback detection of the Ethernet supporting the equivalent multipath. As shown in FIG. 6, the source maintenance end node includes: a transmission path determining unit. a loopback message sending unit and a loopback detecting unit, wherein

 The transmission path determining unit is configured to determine a specified transmission path from a plurality of equivalent transmission paths to the destination maintenance point;

 The loopback message sending unit is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specified transmission path;

 The loopback detection unit is configured to: after receiving the loopback response message returned by the destination maintenance point, and returning the loopback detection success after returning the loopback detection message; the loopback response message includes the source maintenance end node The flow identifier corresponding to the reverse multiplex path.

 Optionally, in the source maintenance node,

The loopback message sending unit is further configured to determine, according to any combination of one or more of the following information input by the operator, the flow identifier corresponding to the specified transmission path, and cancel the loop in the loop The information includes the flow identifier corresponding to the specified transmission path:

 Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.

 Optionally, in the source maintenance node,

 The loopback message sending unit is configured to include, in the loopback message, a stream identifier corresponding to the specified transmission path by:

 The loopback message carries a forwarding label, and the flow label corresponding to the specified transmission path is included in the forwarding label.

 Optionally, in the source maintenance node,

 The loopback response message includes a flow identifier corresponding to the reverse common path, where the node through which the reverse common path passes is completely consistent with the maintenance point of the specified transmission path. .

 Optionally, in the source maintenance node,

 The loopback detection unit is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path is related to the source maintenance end The designated transmission path selected when the node sends the loopback message is common. If yes, it determines that the detection is correct. If not, determines that the detection fails, and returns an announcement that the loopback detection fails.

 The embodiment of the present invention further provides a network node, which is applied to the loopback detection of the Ethernet supporting the equal-cost multipath. As shown in FIG. 6, the loopback response unit is included.

 The loopback response unit is configured to receive a loopback message sent by the source maintenance end node, and send a loopback response message to the source maintenance end node;

 The loopback message includes a flow identifier corresponding to the specified transmission path, where the specified transport path is a one determined by the source maintenance end node from multiple equal-cost transmission paths to the destination maintenance point. The specified transmission path, where the loopback response message includes a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node.

Optionally, in the foregoing network node, The loopback response unit is configured to: after receiving the loopback message, determine the specified transmission path according to the flow identifier included therein, and calculate a flow corresponding to the reverse common path transmission path After the identifier is sent, the loopback response message is sent to the source maintenance end node, and the loop identifier corresponding to the reverse common path transmission path is included in the loopback response message;

 The node through which the reverse multiplex transmission path passes is completely consistent with the maintenance point that the designated transmission path passes.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The embodiments of the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. And modifications are intended to fall within the scope of the appended claims.

 It will be apparent to those skilled in the art that the various modules or steps of the above-described embodiments of the present invention may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed among multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from this The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Industrial applicability

 The loopback detection method and system provided by the above embodiments extend the working mechanism of the Ethernet loopback detection specified by the IEEE 802.1ag standard, so that the function can be applied to the Ethernet supporting ECMP specified by the IEEE 802.1Qbp project, for multiple pieces. Loopback detection is performed on a specific path in an equal-cost path, so that an application scenario with equivalent multipath between two maintenance points can be supported.

Claims

Claim  A loopback detection method, which is applied to an Ethernet supporting an equal-cost multipath, the method includes: the source maintenance end node sends a loopback message to the destination maintenance point, where the loopback message includes the destination maintenance a flow identifier corresponding to a specified one of the plurality of equal-cost transmission paths; the destination maintenance point, after receiving the loopback message, sending a loopback response message to the source maintenance end node, where the ring The response message includes a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node;  After receiving the loopback response message and detecting the error, the source maintenance end node returns an announcement of successful loopback detection.  2. The method of claim 1 wherein  The source maintenance end node determines the flow identifier corresponding to the specified transmission path according to any combination of one or more of the following information input by the operator:  Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.  3. The method according to claim 1 or 2, wherein  After receiving the loopback message, the destination maintenance point determines the specified transmission path according to the flow identifier included therein, and calculates a flow identifier corresponding to the reverse common path transmission path, and then goes to the source The maintenance end node sends a loopback response message, and the loopback response message includes a flow identifier corresponding to the reverse common path transmission path;  The node through which the reverse multiplex transmission path passes is completely consistent with the maintenance point that the designated transmission path passes.  4. The method of claim 1, wherein  The source maintenance end node includes the flow identifier corresponding to the specified transmission path in the loopback message by:  The source maintenance end node carries a forwarding label in the loopback message, and the flow label corresponding to the specified transmission path is included in the forwarding label. 5. The method of claim 3, wherein The step of the source maintenance end node receiving the loopback response message and detecting the error includes: after receiving the loopback response message, the maintenance end node determines the loopback response message according to the flow identifier included therein Transmitting a path, and determining whether the transmission path is common to the specified transmission path selected when the source maintenance end node sends the loopback message, and if yes, determining that the detection is correct, and if not, determining that the detection fails, And return the notification that the loopback detection failed.  A loopback detection system for an Ethernet supporting an equivalent multipath, the system comprising: a transmission path determining unit, a loopback message sending unit, and a loopback detecting unit in a source maintenance end node; Loopback response unit,  The transmission path determining unit is configured to determine a specified transmission path from a plurality of equivalent transmission paths to the destination maintenance point;  The loopback message sending unit is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specified transmission path;  The loopback response unit is configured to: after receiving the loopback message, send a loopback response message to the source maintenance end node, where the loopback response message includes a reverse total to the source maintenance end node. The stream identifier corresponding to the path of the path;  The loopback detection unit is configured to, after receiving the loopback response message and detecting the error, return an announcement that the loopback detection is successful.  7. The system of claim 6 wherein  The loopback message sending unit is further configured to: determine, according to any combination of one or more of the following information input by the operator, a flow identifier corresponding to the specified transmission path, and include the The stream ID corresponding to the specified transmission path:  Flow ID, Equivalence Tree Algorithm ID, Source/Destination Media Access Control (MAC) address, source/destination IP address, source/destination port.  8. The system of claim 6 or 7, wherein  The loopback message sending unit is configured to include, in the loopback message, a stream identifier corresponding to the specified transmission path by: The loopback message carries a forwarding label, and the flow label corresponding to the specified transmission path is included in the forwarding label. 9. The system of claim 6 or 7, wherein  The loopback response unit is configured to: after receiving the loopback message, determine the specified transmission path according to the flow identifier included therein, and calculate a flow corresponding to the reverse common path transmission path After the identifier is sent, the loopback response message is sent to the source maintenance end node, and the loop identifier corresponding to the reverse common path transmission path is included in the loopback response message;  The node through which the reverse multiplex transmission path passes is completely consistent with the maintenance point that the designated transmission path passes.  10. The system of claim 9, wherein  The loopback detection unit is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path is related to the source maintenance end The designated transmission path selected when the node sends the loopback message is common. If yes, it determines that the detection is correct. If not, determines that the detection fails, and returns an announcement that the loopback detection fails.  A source maintenance end node is applied to the loopback detection of the Ethernet supporting the equivalent multipath. The source maintenance end node includes: a transmission path determining unit, a loopback message sending unit, and a loopback detecting unit, where  The transmission path determining unit is configured to determine a specified transmission path from a plurality of equivalent transmission paths to the destination maintenance point;  The loopback message sending unit is configured to send a loopback message to the destination maintenance point, where the loopback message includes a flow identifier corresponding to the specified transmission path;  The loopback detection unit is configured to: after receiving the loopback response message returned by the destination maintenance point, and returning the loopback detection success after returning the loopback detection message; the loopback response message includes the source maintenance end node The flow identifier corresponding to the reverse multiplex path.  12. The source maintenance end node according to claim 11, wherein  The loopback message sending unit is further configured to: determine, according to any combination of one or more of the following information input by the operator, a flow identifier corresponding to the specified transmission path, and include the The stream ID corresponding to the specified transmission path: Flow identification, equivalent tree algorithm identification, source/destination media access control (MAC) address, source/destination IP address, source/destination port.  13. The source maintenance end node according to claim 11 or 12, wherein  The loopback message sending unit is configured to include, in the loopback message, a stream identifier corresponding to the specified transmission path by:  The loopback message carries a forwarding label, and the flow label corresponding to the specified transmission path is included in the forwarding label.  The source maintenance end node according to claim 11 or 12, wherein  The loopback response message includes a flow identifier corresponding to the reverse common path, where the node through which the reverse common path passes is completely consistent with the maintenance point of the specified transmission path. .  15. The source maintenance end node according to claim 14, wherein  The loopback detection unit is configured to: after receiving the loopback response message, determine a transmission path of the loopback response message according to the flow identifier included therein, and determine whether the transmission path is related to the source maintenance end The designated transmission path selected when the node sends the loopback message is common. If yes, it determines that the detection is correct. If not, determines that the detection fails, and returns an announcement that the loopback detection fails.  16. A network node, which is applied to loopback detection of an Ethernet supporting equivalent multipath, including a loopback response unit,  The loopback response unit is configured to receive a loopback message sent by the source maintenance end node, and send a loopback response message to the source maintenance end node;  The loopback message includes a flow identifier corresponding to the specified transmission path, where the specified transport path is a one determined by the source maintenance end node from multiple equal-cost transmission paths to the destination maintenance point. The specified transmission path, where the loopback response message includes a flow identifier corresponding to the reverse unicast transmission path of the source maintenance end node.  17. The network node according to claim 16, wherein The loopback response unit is configured to: after receiving the loopback message, determine the specified transmission path according to the flow identifier included therein, and calculate the reverse common transmission path After the flow identifier is sent, the loopback response message is sent to the source maintenance end node, and the loop identifier corresponding to the reverse common path transmission path is included in the loopback response message;  The node through which the reverse multiplex transmission path passes is completely consistent with the maintenance point that the designated transmission path passes.