CN117955794A

CN117955794A - Method and device for realizing operation and maintenance of operation and maintenance (OAM) through SRBE tunnel

Info

Publication number: CN117955794A
Application number: CN202410018410.2A
Authority: CN
Inventors: 舒文斌; 刘博闻; 黄力
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2024-01-04
Filing date: 2024-01-04
Publication date: 2024-04-30

Abstract

A method and device for realizing OAM operation and maintenance of SRBE tunnels relates to the field of communication, and the method comprises the following steps: filling 12 bits of a source node label behind a VP OAM message GAL label according to a preset rule at a source node, wherein the 4 th bit from left to right in the 12 bits is 1; after receiving the VP OAM message, the sink node obtains a source node tag by analyzing the 12 bits. The application solves the problem that the sink node can not sense the message source, and realizes the end-to-end OAM operation and maintenance.

Description

Method and device for realizing operation and maintenance of operation and maintenance (OAM) through SRBE tunnel

Technical Field

The application relates to the field of communication, in particular to a method and a device for realizing operation and maintenance of operation and maintenance (OAM) through a SRBE tunnel.

Background

With the progress of the age, network services are more and more, and different types of services have different requirements on the network, for example, real-time application programs generally require paths with low delay and low jitter, and big data applications require channels with low packet loss rate and high bandwidth. If the thought of the service is still adapted to the network, the service cannot be rapidly developed, and the network deployment becomes more and more complex and is difficult to maintain.

SR (Segment Routing) is generated in this context. SR is combined with MPLS (Multi Protocol Label Switching ) to form SR-MPLS technology. SRTP (Segment Routing Transport Profile, segment routing subset) tunneling is a new tunneling technique based on IETF SR (RFC 8402) source routing tunneling for transport-oriented domain operation and maintenance capability enhancement, including both SRTP and SRBE (Segment Routing Best Effort, best effort forwarding based segment routing) types of tunnels. The SRTP tunnel is used for bearing connection-oriented point-to-point service and providing connection-based end-to-end monitoring operation and maintenance capability; the SRBE tunnel is used for connectionless, mesh service bearer, providing arbitrary topology service connection and simplifying tunnel planning and deployment.

According to the actual needs of the operator network operation, the management work of the network is generally divided into 3 major categories: operation (Operation), administration (Maintenance), maintenance (Maintenance), abbreviated as OAM (Operation Administration AND MAINTENANCE). The method mainly completes analysis, prediction, planning and configuration work of daily network and business; maintenance is mainly a daily operation activity performed on testing and fault management of a network and services thereof. In SDH (Synchronous DIGITAL HIERARCHY) and MPLS era, OAM has a well-established standard and application. As networks evolve to SR-MPLS, the corresponding OAM also needs to evolve further to accommodate the new network technologies. For SRTE tunnels, as shown in fig. 1, by adding a Path SID label to the innermost layer of the tunnel label, an end-to-end flow is uniquely identified, so as to form an enhanced SRTP tunnel, and thus, the OAM operation and maintenance requirements can be satisfied. However, for SRBE tunnels, as shown in fig. 2, since the message only carries the node label of the sink node from the source node to the sink node, the sink node cannot perceive the source of the message, and thus, the end-to-end OAM operation and maintenance cannot be performed.

Disclosure of Invention

The application provides a method for realizing OAM operation and maintenance through SRBE tunnels, which can solve the problem that the end-to-end OAM operation and maintenance cannot be realized in the prior art.

In a first aspect, an embodiment of the present application provides a method for implementing OAM in a SRBE tunnel, where the method includes:

At a source node, filling a source node tag in 12 bits after a VP OAM message GAL tag according to a preset rule, wherein the 12 bits are used as a marking value, and the 4 th bit from left to right in the 12 bits is 1;

after receiving the VP OAM message, the sink node obtains a source node tag by analyzing the 12 bits.

With reference to the first aspect, in an implementation manner, the filling the source node tag with 12 bits after the VP OAM packet GAL tag according to a preset rule includes:

When the source node label is greater than or equal to 256, the source node label is divided by 256 and then shifted left by 9 bits to fill the first 3 bits, and the source node label is divided by 256 to fill the remaining 8 bits.

when the source node label is less than 256, the first 3 bits are 0, and the source node label is padded in the last 8 bits.

In combination with the first aspect, in one implementation manner, VP OAM is configured at the source node, a loopback port ip address of the sink node is bound, a sink node label is obtained according to the loopback port ip address of the sink node, and the sink node label is written into the VP OAM packet.

In combination with the first aspect, in one implementation manner, the sink node configures VP OAM, binds a loopback port ip address of the source node, obtains a source node tag according to the source node loopback port ip address, calculates a tag value according to the source node tag, and matches the sink node tag, the GAL tag and the tag value in the VP OAM packet after receiving the VP OAM packet.

With reference to the first aspect, in an embodiment, the method further includes:

When a certain SRBE tunnel fails, the network manager configures each node 1588 in the SR domain to synchronize; issuing the matching relation of the sink node label, the GAL label and the marking value to each intermediate node in the SR domain;

Each intermediate node matches the VP OAM message, samples and copies the VP OAM message, and the matched intermediate node converts the VP OAM message into a brief information message to report to a network manager after adding the receiving time and the current node label to the VP OAM message;

And the network manager receives all the brief information messages, sorts the brief information messages with the same source node labels and the same destination node labels according to the receiving time, and obtains the path information of the SRBE tunnel path nodes with faults.

With reference to the first aspect, in an implementation manner, the brief information packet includes a receiving time of the VP OAM packet, a source node tag, a sink node tag, and a node tag of the local node.

In a second aspect, the present application further provides an apparatus for implementing OAM in a SRBE tunnel, where the apparatus includes:

the filling module is used for filling 12 bits of the source node label after the VP OAM message GAL label according to a preset rule in the source node, wherein the 12 bits are used as a marking value, and the 4 th bit from left to right in the 12 bits is 1;

And the extraction module is used for obtaining a source node label by analyzing the 12 bits after the sink node receives the VP OAM message.

With reference to the second aspect, in an implementation manner, the filling the source node tag with 12 bits after the GAL tag of the VP OAM packet according to a preset rule includes:

When the source node label is greater than or equal to 256, dividing the source node label by 256, then shifting left by 9 bits to fill the first 3 bits, dividing the source node label by 256 and filling the remainder by 8 bits;

With reference to the second aspect, in one implementation manner, the device further includes a matching module, provided at each intermediate node;

When a certain SRBE tunnel fails, the network manager configures each node 1588 in the SR domain to synchronize; issuing the destination node label, the GAL label and the marking value to each intermediate node for matching;

the matching module of each intermediate node is used for matching the VP OAM message, sampling and copying, and the matched nodes convert the VP OAM message into a brief information message to be reported to a network manager after adding the receiving time and the current node label to the VP OAM message;

The technical scheme provided by the embodiment of the application has the beneficial effects that:

And at the source node, filling the source node label with 12 bits after the VP OAM message GAL label according to a preset rule, wherein the 12 bits are used as a marking value, and after the sink node receives the VP OAM message, the source node label is obtained by analyzing the marking value, so that the problem that the sink node cannot perceive the source of the message is solved, and the end-to-end OAM operation and maintenance is realized.

Furthermore, by writing the source node label in the VP OAM packet, in the manner that the intermediate node matches the corresponding source node label, the sink node label and the GAL label, and reports the brief information to the network manager, the SRBE tunnels can be distinguished when different SRBE tunnels pass through the same intermediate node, and then the path information of the SRBE path node can be further displayed when a SRBE tunnel fault occurs.

Drawings

Fig. 1 is a schematic diagram of SRTP tunnel forwarding in the prior art;

Fig. 2 is a schematic diagram of SRBE tunnel forwarding in the prior art;

Fig. 3 is a schematic diagram of a VP OAM packet encapsulation format in the prior art;

fig. 4 is a schematic diagram of a VP OAM packet encapsulation format in an embodiment of the present application;

FIG. 5 is a schematic diagram illustrating a SRBE tunnel path discrimination in an embodiment of the present application.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

First, some technical terms in the present application are explained so as to facilitate understanding of the present application by those skilled in the art.

SR: segment Routing, segment Routing.

SRBE: segment Routing Best Effort, best effort based segment routing.

SRTP: segment Routing Transport Profile, segment route conveys the subset.

OAM: operation Administration AND MAINTENANCE, operation maintenance management.

Path SID: and (5) path labels.

LSP (label switched path): label SWITCHING PATH, label switching path.

GAL: G-Ach tags, G-Ach refers to a generally associated channel.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

In a first aspect, an embodiment of the present application provides a method for implementing OAM in a SRBE tunnel, including:

And at the source node, filling the source node label in 12 bits (bits) after the VP OAM message GAL label according to a preset rule, taking the 12 bits as a marking value, taking the 4 th bit from left to right of the 12 bits as a stack bottom, and setting the fixed value as 1.

After receiving the VP OAM message, the sink node obtains a source node label by analyzing the marking value, namely 12 bits.

In one embodiment, a SRBE tunnel is configured between a source node and a destination node through a network manager; the SRBE tunnel configuration IS preceded by configuration of IGP protocol (IS-IS or OSPF etc.), ensuring that the network elements are interworking at the network layer. After SRBE tunnel establishment, each node knows the node labels and loopback port ip addresses of the other nodes.

And configuring VP OAM at the source node, and binding the loopback port ip address of the sink node. And the source node queries according to the destination node loop back port ip address, and can obtain the node label of the destination node. In this embodiment, the source node label is written into the VP OAM packet according to a preset rule, and the sink node label is written into the VP OAM packet and sent out according to the existing SRTP OAM mode.

Fig. 3 is a schematic diagram of a VP OAM packet encapsulation format in the prior art. In this embodiment, as shown in fig. 4, 12 bits behind the GAL tag (i.e. 13 tag) in the VP OAM packet in the prior art are used as the tag value, and the 4 th bit of the 12 bits is used as the stack bottom, and the fixed value is 1. Since the total of TC plus TTL after GAL label in VP OAM packet (as shown in fig. 3) is 11 bits, a total of 2 ¹¹ -16=2032 node labels can be supported, that is, networking of up to 2032 device nodes in SR domain is supported, and the engineering networking requirement is satisfied, wherein the reason for subtracting 16 is: the 0 to 15 tags are reserved tags.

Further, in one embodiment, when the source node tag is not less than 256, the source node tag is divided by 256 and shifted to the left by 9 bits, and the first 3 bits (TC after GAL tag in FIG. 3) are filled; the source node label is divided by 256 and the remaining 8 bits (TTL after GAL label in fig. 3) are filled.

Further, in one embodiment, when the source node label is less than 256, the first 3 bits (TC after GAL label in fig. 3) are 0, and the source node label is padded with the last 8 bits (TTL after GAL label in fig. 3).

The preset rule tc+s+ttl filling field pseudo code is as follows:

if source node tag > =256

Pad field = ((source node tag/256) < < 9) +256+ (source node tag% 256)

else

Pad field = 256+ source node label

For the intermediate node, the VP OAM message is forwarded according to the node label of SRBE without additional configuration.

Further, in an embodiment, the sink node receives the VP OAM packet forwarded by the intermediate node. Specifically, the VP OAM is configured at the sink node, and the loopback port ip address of the source node is bound. And the sink node obtains a node label of the source node according to the source node loopback port ip address query.

After the source node label calculates the marking value according to the calculation rule, the sink node sends the matching relationship to the forwarding layer according to the matching relationship of the source node label (namely the sink node label) +GAL label+marking value >. And the forwarding layer matches the destination node label, the GAL label and the label value in the VP OAM message according to the matching relation, and extracts the matched destination node label, GAL label and label value to the processor for OAM function analysis and calculation. Because the VP OAM message carries an active node label, time delay, packet loss and the like can be calculated, so that the purpose of end-to-end OAM operation and maintenance is achieved.

Furthermore, the label value calculated by the source node label is filled by two parts of TC (3 bits) +TTL (8 bits) which are mutually separated, and the label value formed by adding the middle stack bottom bits is continuous, so that the forwarding layer does not need to take out the label value of 12 bits separately and splice the label value, the realization difficulty of the forwarding layer is reduced.

In the above embodiment, the VP OAM message transmission from the source node to the sink node is an OAM process in one direction, and the same processing process is performed in the opposite direction, which is not described herein.

In the prior art, when packet loss or serious time delay is detected between a source node and a destination node, an operator hopes to further locate which intermediate nodes the path of the fault passes through. Since the SRBE tunnels only carry node labels of the sink nodes from the source node to the sink node, when a plurality of SRBE tunnels reaching the sink node in the network pass through the same intermediate node, the intermediate nodes of the SRBE tunnels cannot distinguish different SRBE tunnels, so that the path information of the SRBE tunnel with the fault cannot be correctly displayed.

In an embodiment, the method further includes a step of obtaining a path of the SRBE tunnel path node with the failure in the end-to-end OAM operation and maintenance.

When a failure occurs in a SRBE tunnel, such as packet loss or excessive delay, a further view of the node path of the SRBE tunnel path is required.

Firstly, a network manager configures each node 1588 to synchronize in an SR domain, and a timestamp after 1588 synchronization is used as a sequencing basis of SRBE tunnel brief information messages. The network manager configures the matching relation of each intermediate node < sink node label+GAL label+marking value > in the SR domain and sends the matching relation to the forwarding layer.

Then, the forwarding layer of each node matches and samples and extracts the VP OAM message. The number of VP OAM messages is large, and sampling is to reduce workload of network management ordering and load of devices, and sampling frequency may be set, for example, 1000 VP OAM messages may be extracted by 1.

The intermediate node through which the VP OAM message passes is matched with the VP OAM message sent by the upper source node, and the intermediate node needs to convert the VP OAM message into a brief information message to report to a network manager after adding the receiving time and the current node label to the VP OAM message; at this time, the brief information message includes the receiving time of the VP OAM message, the source node tag, the sink node tag, and the node tag of the own node.

And finally, after the network manager receives all the brief information messages, the brief information messages with the same source node labels and the same destination node labels are incrementally sequenced according to the receiving time (1588 time), and the path information of the SRBE tunnel path nodes with faults is obtained.

As shown in fig. 5, the steps are further described by taking two SRBE tunnels OAM to the sink node 8 as an example.

In fig. 5, the first SRBE tunnel has a path one: source node 1, intermediate node 2, intermediate node 3, intermediate node 7, intermediate node 4, and sink node 8. The second SRBE tunnel has a path two: source node 9, intermediate node 6, intermediate node 3, intermediate node 7, intermediate node 4, and sink node 8.

And respectively calculating source node labels of VP OAM messages of the source node 1 and the source node 9 according to the preset rule, filling TC and TTL after GAL labels and forming a marking value with stack bottom bits. The VP OAM message (format shown in fig. 3) carrying the source node label is sent to the sink node 8 according to the existing SRTP OAM scheme.

And issuing the matching relation of the < sink node label+GAL label+marking value > at all intermediate nodes in the SR domain through the network manager. Assuming that only SRBE OAM of the path one has a fault, namely the source node label is a node 1 label and the destination node is a node 8 label; the source node label may be obtained from the tag value.

After all intermediate nodes passed by the SRBE tunnel are matched, the VP OAM brief information message is copied through sampling and reported to a network manager. Since the VP OAM packet carries the source node tag and the sink node tag, the intermediate nodes 2, 6, 3, 4, and 7 can distinguish between the different SRBE tunnels.

After the VP OAM packet arrives at the destination node 8, the network manager obtains the SRBE tunnel path intermediate node from node 1 to node 8 by ordering the received brief information packet, so that the SRBE path node path can be displayed after SRBE detects the fault. In this embodiment, the intermediate nodes matched to the path one are node 2, intermediate node 3, intermediate node 4, and intermediate node 7.

In this embodiment, by writing the source node label into the VP OAM packet at the source node, matching the corresponding source node label and sink node label at the intermediate node, and reporting the brief information packet to the network management, different SRBE tunnels can be distinguished when different SRBE tunnels pass through the same intermediate node, and further, path information of SRBE path nodes is further displayed when a SRBE tunnel fault occurs.

In a second aspect, an embodiment of the present application further provides an apparatus for implementing OAM in a SRBE tunnel, where the apparatus includes a filling module and an extracting module.

And the filling module is used for filling 12 bits of the source node label after the VP OAM message GAL label according to a preset rule at the source node, wherein the 4 th bit from left to right in the 12 bits is 1 as a marking value.

Further, in an embodiment, filling the source node tag with 12 bits after the GAL tag of the VP OAM packet according to a preset rule includes:

Further, in an embodiment, the apparatus further includes a matching module disposed at each intermediate node. When a certain SRBE tunnel fails, the network manager configures each node 1588 in the SR domain to synchronize; and issuing a destination node label, a GAL label and a marking value to each intermediate node for matching.

And the matching module of each intermediate node is used for matching and sampling copying the host node label, the GAL label and the label value in the VP OAM, and if the host node label, the GAL label and the label value are matched, the VP OAM message is converted into brief information to be reported to a network manager after the receiving time and the current node label are added.

And the network manager sorts all the received brief messages according to the receiving time to obtain the path information of the SRBE tunnel path node with the fault.

The function implementation of each module in the device for implementing OAM in the SRBE tunnel corresponds to part of the steps in the embodiment of the method for implementing OAM in the SRBE tunnel, and the functions and implementation processes thereof are not described in detail herein.

The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the foregoing drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

In describing embodiments of the present application, "exemplary," "such as," or "for example," etc., are used to indicate by way of example, illustration, or description. Any embodiment or design described herein as "exemplary," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.

In some of the processes described in the embodiments of the present application, a plurality of operations or steps occurring in a particular order are included, but it should be understood that the operations or steps may be performed out of the order in which they occur in the embodiments of the present application or in parallel, the sequence numbers of the operations merely serve to distinguish between the various operations, and the sequence numbers themselves do not represent any order of execution. In addition, the processes may include more or fewer operations, and the operations or steps may be performed in sequence or in parallel, and the operations or steps may be combined.

It should be noted that, the foregoing reference numerals of the embodiments of the present application are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method according to the embodiments of the present application.

The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. A method for implementing OAM in a SRBE tunnel, the method comprising:

2. The method for implementing OAM in a SRBE tunnel according to claim 1, wherein said filling the source node tag with 12 bits after the GAL tag of the VP OAM packet according to a preset rule includes:

3. The method for implementing OAM in a SRBE tunnel according to claim 1, wherein said filling the source node tag with 12 bits after the GAL tag of the VP OAM packet according to a preset rule includes:

When the source node tag is less than 256, the first 3 bits are set to 0, and the source node tag is padded in the last 8 bits.

4. A method for implementing OAM in a SRBE tunnel as claimed in claim 2 or 3, wherein: and configuring VP OAM at the source node, binding the loopback port ip address of the sink node, obtaining a sink node label according to the loopback port ip address of the sink node, and writing the sink node label into the VP OAM message.

5. The method for implementing OAM in a SRBE tunnel as recited in claim 4, wherein:

The sink node configures VP OAM, binds a loopback port ip address of a source node, obtains a source node tag according to the source node loopback port ip address, calculates a tag value according to the source node tag, and matches the sink node tag, the GAL tag and the tag value in the VP OAM message after receiving the VP OAM message.

6. The method of SRBE tunneling OAM according to claim 5, further comprising:

7. The method for implementing OAM of SRBE tunnel as recited in claim 6, wherein: the brief information message comprises the receiving time of the VP OAM message, a source node label, a destination node label and a node label of the local station node.

8. An apparatus for implementing OAM in a SRBE tunnel, the apparatus comprising:

9. The apparatus for implementing OAM in a SRBE tunnel according to claim 8, wherein said filling the source node tag with 12 bits after the GAL tag of the VP OAM packet according to a preset rule includes:

10. The SRBE tunneling OAM apparatus as recited in claim 9, wherein: the matching module is arranged at each intermediate node;