CN112491687B

CN112491687B - Method and device for processing message

Info

Publication number: CN112491687B
Application number: CN202011213066.0A
Authority: CN
Inventors: 吴军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2022-04-12
Anticipated expiration: 2038-03-29
Also published as: CN110324225B; CN110324225A; CN112491687A

Abstract

A method and a device for processing messages are applied to a controller or a network node in a PTN network system, and the method comprises the following steps: the method comprises the steps that a controller determines a mapping relation between a Segment Routing (SR) tunnel label and a Flexe tunnel, and sends the mapping relation to a first network node, so that the first network node sends a message comprising the SR tunnel label to a second network node through the Flexe tunnel according to the mapping relation, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node. The service bearing is completed through the FLexe tunnel, the requirements of independent scheduling and flow isolation of the integrated service can be met, and the service delay can be improved and reduced.

Description

Method and device for processing message

The scheme is a divisional application of Chinese patent application with the application number of 201810271880.4, the application date of 2018, 03 and 29, and the invention name of 'a method and a device for processing messages'.

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a storage medium for processing a packet.

Background

In the fifth generation mobile communication technology (5G) network service evolution, a mechanism for bearing a three-layer virtual private network (L3 VPN) service based on an SR tunnel can meet a requirement for bearing a partially integrated 5G network service, where the mechanism includes a segment routing-traffic (SR-TE) tunnel based on traffic engineering and a segment routing-best effort (SR-BE) tunnel based on best-effort forwarding, the SR-TE tunnel mechanism forwards a message to a corresponding link port by using an outermost adjacent label, and the SR-BE tunnel mechanism plans a shortest forwarding path based on an Interior Gateway Protocol (IGP) protocol, and forwards the message to the corresponding link port according to the outermost node label. The two mechanisms can realize the forwarding of packet messages, and the isolation, independent scheduling and comprehensive service bearing of different types of service flow to physical bandwidth by the service path and SR tunnel rerouting function can be adjusted by adjusting the label encapsulated by the source node. However, services based on the SR tunnel require hop-by-hop network nodes to forward packet messages, but are limited by the networking scale of the access ring, the fiber distance, and the chip capability of the network nodes, so the overall forwarding efficiency is low. Secondly, because the message can only be forwarded based on the strict display path, and the path for forwarding the message nearby is long, the forwarding delay of the message is increased. Therefore, the current mechanism for bearing the L3VPN service based on the SR tunnel cannot meet the network fragmentation application of the forwarding plane, that is, cannot meet the requirement of complete isolation of different services on bandwidth.

Disclosure of Invention

The application provides a method, a device and a storage medium for processing a message, which can solve the problem that the performance of a mobile bearer network for carrying out comprehensive 5G services based on a mechanism of bearing L3VPN services by an SR tunnel in the prior art is lower.

In a first aspect, an embodiment of the present application provides a method for processing a packet, where the method is performed by a controller in a packet transport network PTN network system, and the converged network system further includes a first network node and a second network node. The method comprises the following steps:

and determining the mapping relation between the segment routing SR tunnel label and the Flexe tunnel.

And sending the mapping relation to the first network node, so that the first network node sends a message including the SR tunnel label to the second network node through the Flexe tunnel according to the mapping relation, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

In the embodiment of the application, after determining the mapping relationship between the SR tunnel label and the FlexE tunnel, the controller issues the mapping relationship to the corresponding first network node, so that the first network node can send a message to the second network node according to the FlexE tunnel determined by the mapping relationship. The service bearing is completed through the Flexe tunnel and the SR tunnel, the requirements of independent scheduling and flow isolation of the integrated service can be met, and the service delay can be reduced.

In some possible designs, in this embodiment of the present application, an intermediate node may be included between the first network node and the second network node. For example, the end-to-end FlexE tunnel between the first network node and the second network node may be a FlexE tunnel between nodes 1- > node 2 that may be automatically established according to IGP, or a FlexE tunnel between nodes 1- > node 3- > node 4- > node 2 that may be automatically established according to IGP.

In some possible designs, the PTN network system includes an access ring, wherein the first network node and the second network node are both nodes in the access ring. By configuring the mapping relationship for the first network node, the first network node can communicate with the second network node in the access ring through the mapped Flexe tunnel in the access ring, thereby reducing the forwarding delay between the nodes in the same access ring.

In some possible designs, the PTN network system includes an access ring and a convergence ring, wherein the first network node is a node in the access ring and the second network node is a node in the convergence ring. By configuring the mapping relationship for the first network node, the first network node in the access ring can communicate with the second network node in the convergence ring through the mapped Flexe tunnel, so that the forwarding time delay from the access ring to the convergence ring can be reduced, and the smoothness of the service is guaranteed.

In some possible designs, the PTN network system includes a convergence ring and a core ring, wherein the first network node is a node in the convergence ring and the second network node is a node in the core ring. As can be seen, by configuring the mapping relationship for the first network node, the first network node in the aggregation ring can communicate with the second network node in the core ring through the mapped FlexE tunnel, which can reduce the forwarding delay from the aggregation ring to the core ring and ensure the smoothness of the service.

In some possible designs, the PTN network system includes a first access ring, a second access ring and a convergence ring, the first network node is a node in the first access ring, the second network node is a node in the convergence ring, a destination IP address of the packet is an IP address of a third network node in the second access ring, and the first network node communicates with the third network node through the second network node.

When the second network node communicates with the third network node, the second network node may first determine, based on the mapping relationship between the SR tunnel tag and the FlexE tunnel acquired from the controller, the FlexE tunnel mapped to the SR tunnel tag, and then forward the packet to the third network node based on the FlexE tunnel. The communication mode between the second network node and the third network node may refer to the communication mode between the first network node and the second network node, and may also adopt other communication modes, which is not limited in this application.

It can be seen that, by configuring the mapping relationship for the first network node, the first network node in the access ring can communicate with the second network node in the convergence ring through the mapped FlexE tunnel, thereby reducing the forwarding delay from the access ring to the convergence ring. In addition, after the message is sent to the second network node, the second network node sends the message to the third network node through the mapped Flexe tunnel, so that communication between the network nodes in different access rings is realized, and meanwhile, the forwarding delay between the network nodes in different access rings is also reduced.

In some possible designs, the SR tunnel label is a best effort forwarding based segment routing SR-BE tunnel label.

For example, when the first network node and the second network node are both nodes in the same access ring, the SR-BE tunnel label is a node label of the second network node.

For another example, when the first network node and the second network node are nodes in an access ring and a convergence ring, respectively, the SR-BE tunnel label is a node label of the second network node.

For another example, when a first network node, a second network node, and a third network node are respectively located in a first access ring, a convergence ring, and a second access ring in sequence (i.e., when the first network node communicates with the third network node through the second network node), and when a packet is transmitted between the first network node and the second network node, the SR-BE tunnel label is a node label of the second network node; and when the message is transmitted between the second network node and the third network node, the SR-BE tunnel label is the node label of the third network node.

Optionally, when the SR tunnel label is an SR-BE tunnel label, the FlexE tunnel mapped to the SR tunnel label may carry a first service, where the first service may include a service of traffic interworking between different base stations, for example, an eX2 service.

In some possible designs, the SR tunnel label is a traffic engineering based segment routing SR-TE tunnel label.

Optionally, the SR-TE tunnel label is an outermost adjacent label of the SR-TE tunnel label stack. The scheme of mapping the message to the Flexe tunnel based on the outermost adjacent label of the SR-TE tunnel label stack can reduce the number of labels packaged by the SR-TE tunnel label stack, thereby improving the overall packaging efficiency of the message and also improving the forwarding performance of the system and the maximum specification supported by the MTU; meanwhile, absolute isolation of services can be realized, and end-to-end transmission delay is reduced.

Optionally, when the SR tunnel label is an SR-TE tunnel label, a service corresponding to the packet is a second service, where the second service includes a service of traffic intercommunication between the base station and the core network, for example, an S1 service.

In some possible designs, the controller may further establish a mapping relationship between different SR tunnel labels and the same FlexE tunnel, so as to map SR-TE tunnels corresponding to at least two services to the same FlexE tunnel. By the method, different services can be borne by the same Flexe tunnel, and isolation among different services can be realized.

For example, if a first S1 service and a second S1 service are deployed at the same time, different SR-TE tunnels are deployed for the first S1 service and the second S1 service, respectively, and the SR-TE tunnels deployed for the first S1 service and the second S1 service are both mapped to the same FlexE tunnel. In this way, the same FlexE tunnel can carry different S1 services, and isolation between different S1 services can be realized.

In some possible designs, the bandwidth of the FlexE tunnel corresponding to the node in the convergence ring is obtained according to the number of base stations to be accessed by the node of the convergence ring and the bandwidth convergence ratio from the access ring to the convergence ring. The bandwidth multiplexing can be realized without planning a fixed Flexe tunnel bandwidth for each service.

In some possible designs, each node in the access ring corresponds to a different IGP domain; and the IGP domain corresponding to the node in the convergence ring is the same as the IGP domain corresponding to the node in the core ring. The L3VPN is layered at the aggregation ring nodes by dividing the IGP domain, so that the overlarge scale of the L3VPN domain can be avoided, mutual diffusion routing between access rings is avoided, and the operation and maintenance complexity between the access ring nodes is reduced.

In a second aspect, an embodiment of the present application provides a method for processing a packet, where the method is performed by a first network node included in a Packet Transport Network (PTN) network system, and the PTN network system further includes a second network node, where the method includes:

acquiring a message including an SR tunnel label;

and determining the Flexe tunnel mapped with the SR tunnel label based on the mapping relation between the SR tunnel label and the flexible Ethernet Flexe tunnel.

And sending the message including the SR tunnel label to the second network node through the Flexe tunnel, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

In the embodiment of the application, when forwarding the packet, the first network node may determine, based on a mapping relationship between an SR tunnel label and a FlexE tunnel, the FlexE tunnel mapped to the SR tunnel label, and then may forward the packet through the FlexE tunnel obtained through mapping. Therefore, the service bearing is completed through the FLexe tunnel and the SR tunnel, the requirements of independent scheduling and flow isolation of the integrated service can be met, and the service delay can be reduced.

In some possible designs, the obtaining the packet including the SR tunnel label includes:

and receiving a first message, wherein the first message carries a destination Internet Protocol (IP) address.

And according to the destination IP address, encapsulating a Segment Routing (SR) tunnel label in the first message to obtain a second message comprising the SR tunnel label.

In some possible designs, the PTN network system further includes a controller, and before obtaining the packet including the segment routing SR tunnel label, the method further includes:

and receiving the mapping relation sent by the controller. The mapping relation is used for the first network node to determine a Flexe tunnel mapped with the SR tunnel label, and then the message is forwarded to the next-hop network node through the determined Flexe tunnel.

In some possible designs, the PTN network system includes an access ring, wherein the first network node and the second network node are both nodes in the access ring. It can be seen that, by configuring a mapping relationship for a first network node, the first network node can communicate with a second network node in an access ring through a mapped FlexE tunnel in the access ring, thereby reducing the forwarding delay between nodes in the same access ring.

In some possible designs, the PTN network system includes an access ring and a convergence ring, wherein the first network node is a node in the access ring and the second network node is a node in the convergence ring. Therefore, the first network node in the access ring can determine the corresponding Flexe tunnel based on the mapping relation, and the communication between the mapped Flexe tunnel and the second network node in the convergence ring can reduce the forwarding time delay from the access ring to the convergence ring and guarantee the fluency of the service.

In some possible designs, the PTN network system further includes a convergence ring and a core ring, wherein the first network node is a node in the convergence ring and the second network node is a node in the core ring. Therefore, the first network node in the convergence ring can determine the corresponding Flexe tunnel based on the mapping relation, and the communication between the mapped Flexe tunnel and the second network node in the core ring can reduce the forwarding time delay from the convergence ring to the core ring and guarantee the fluency of the service.

In some possible designs, the PTN network system includes a first access ring, a second access ring, and a convergence ring, the first network node is a node in the first access ring, the second network node is a node in the convergence ring, a destination IP address of the first packet is an IP address of a third network node in the second access ring, and the first network node communicates with the third network node through the second network node.

Therefore, the first network node in the access ring can determine the corresponding FlexE tunnel based on the mapping relation, and the mapped FlexE tunnel is communicated with the second network node in the convergence ring, so that the forwarding delay from the access ring to the convergence ring is reduced. In addition, after the second message is sent to the second network node, the second network node sends the message to the third network node through the Flexe tunnel which is mapped, so that communication between the network nodes in different access rings is realized, and meanwhile, the forwarding delay between the network nodes in different access rings is also reduced. Therefore, in the embodiment of the application, the fully interconnected FLexE tunnel 1 does not need to be established between the first access ring and the second access ring for the second service (for example, the eX2 service), and the second service across the access rings can also be realized, so that the configuration and management of the FLexE tunnel across the access rings are reduced, the networking complexity of the whole access ring is also reduced, and the management is facilitated.

For example, when the first network node and the second network node are both nodes in the same access ring, the SR-BE tunnel label is a node label of the second network node. The first network node may map the second packet to an end-to-end FlexE tunnel 1 between the first network node and the second network node according to a mapping relationship between a node label of the second network node and the FlexE tunnel 1, thereby implementing forwarding of the packet.

For another example, when the first network node and the second network node are nodes in an access ring and a convergence ring, respectively, the SR-BE tunnel label is a node label of the second network node. The first network node may map the second packet to an end-to-end FlexE tunnel 1 between the first network node and the second network node according to a mapping relationship between a node label of the second network node and the FlexE tunnel 1, thereby implementing forwarding of the packet.

Optionally, the SR-TE tunnel label is an outermost adjacent label of the SR-TE tunnel label stack. The scheme of mapping the message to the Flexe tunnel based on the outermost adjacent label of the SR-TE tunnel label stack can reduce the number of labels packaged by the SR-TE tunnel label stack, thereby improving the overall packaging efficiency of the message and also improving the forwarding performance of the system and the maximum specification supported by the MTU; meanwhile, different services can be isolated, and the end-to-end transmission delay is reduced.

In some possible designs, the first network node may be an intermediate node that forwards the packet, or may be a source node that forwards the packet. If the first network node is a source node for forwarding a packet in the PTN network system, after receiving the packet, the first network node may further add a first SR-TE tunnel label stack to the first packet to obtain a second packet, where the first SR-TE tunnel label stack is used to send the second packet from the access ring to the aggregation ring. It can be seen that only the first network node as the source node adds the adjacency or node labels of all forwarding paths, and the intermediate node removes the sticky label without adding any label. In each ring, only the label in the ring is configured, and the source node of the access ring does not need to configure all labels of the whole system, so that the number of the labels in the access ring can be reduced, and the encapsulation efficiency of the message in the access ring is improved.

For example, the first network node is a node in an access ring, and the second network node is a node in an aggregation ring. In the process of forwarding the second packet from the first network node to the second network node, if other intermediate nodes exist between the source node and the aggregation ring node, when the second packet is forwarded in the access ring, forwarding the packet based on the FlexE tunnel 1 may include the following two embodiments: in one embodiment, the first network node serving as the source node maps the second packet to the FlexE tunnel 1 corresponding to the outermost adjacent label according to the current outermost adjacent label of the second packet, and when the packet reaches the intermediate node, the intermediate node directly forwards the second packet to the second network node in the aggregation ring through the FlexE tunnel 1 without performing packet processing on the second packet based on the L3 VPN. And when the message reaches the second network node, the second network node removes the first SR-TE tunnel label stack of the second message. Similarly, the second network node needs to add a second SR-TE tunnel label stack in the second packet, and the second network node forwards the second packet through the mapped FlexE tunnel 2 according to the outermost adjacent label of the second packet, and the operation of forwarding the second packet by the second network node is the same as that of the first network node, which is not described in detail. In another embodiment, the first network node serving as the source node may remove the current outermost adjacent label of the second packet, map the second packet to the corresponding FlexE tunnel 1, and when the second packet reaches the intermediate node, the intermediate node also removes the current outermost adjacent label of the second packet until the second packet reaches the second network node in the aggregation ring. When the second packet reaches the second network node, the first SR-TE tunnel label stack of the second packet has been completely removed. Similarly, the second network node needs to add a second SR-TE tunnel label stack in the packet, remove the outermost adjacent label of the second packet, and forward the second packet through the mapped FlexE tunnel 2, where the operation of forwarding the second packet by the second network node is the same as that of the first network node, and is not described again.

Optionally, when the SR tunnel label is an SR-TE tunnel label, a service corresponding to the second packet may be a second service, where the second service includes a service of traffic intercommunication between the base station and the core network, for example, an S1 service.

In a third aspect, embodiments of the present application provide a controller, configured to perform the method in the first aspect or any possible design of the first aspect. In particular, the controller may comprise means for performing the method of the first aspect described above or any possible design of the first aspect.

In a fourth aspect, embodiments of the present application provide a network node, configured to perform the method in the second aspect or any possible design of the second aspect. In particular, the network node may comprise means for performing the method of the second aspect described above or any possible design of the second aspect.

In a fifth aspect, an embodiment of the present application provides a communication device for processing a message, which includes a processor, a memory, a transceiver, and a bus, where the processor, the memory, and the transceiver are connected via the bus. Wherein the memory is configured to store program code and the processor is configured to invoke the program code in the memory to perform the operations performed by the controller in the first aspect or to perform the operations performed by the network node in the second aspect.

Wherein the transceiver may also be replaced by a receiver and a transmitter, which may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver. The memory may be integrated in the processor or may be provided separately from the processor.

In a sixth aspect, an embodiment of the present application provides a communication device for processing a message, which includes a processor, a memory, a transceiver, and a bus, where the processor, the memory, and the transceiver are connected via the bus. Wherein the memory is configured to store program code and the processor is configured to invoke the program code in the memory to perform the operations performed by the network node in the second aspect.

In a seventh aspect, an embodiment of the present application provides a communication system, where the communication system includes the controller in the third aspect and the network node in the fourth aspect; alternatively, the communication system includes the communication apparatus described in the fifth aspect and the communication apparatus described in the sixth aspect.

In an eighth aspect, embodiments of the present application provide a computer storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the operations performed by the controller in the first aspect or perform the operations performed by the network node in the second aspect.

Drawings

Fig. 1 is a schematic diagram of a PTN network system architecture in the prior art;

fig. 2 is a schematic diagram of a PTN network system architecture according to an embodiment of the present application;

fig. 3 is a schematic flowchart of a method for processing a packet in an embodiment of the present application;

fig. 4a is a schematic flowchart of a process of forwarding an eX2 service packet and an S1 service packet in this embodiment;

fig. 4b is a schematic flowchart of a process of forwarding an eX2 service packet and an S1 service packet in the embodiment of the present application;

fig. 5 is a schematic flow chart of forwarding an eX2 service packet in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a controller according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a network node in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device for processing a message in an embodiment of the present application.

Detailed Description

The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprise," "include," and "have," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules expressly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus, the division of modules presented herein is merely a logical division that may be implemented in a practical application in a further manner, such that a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not implemented, and such that couplings or direct couplings or communicative coupling between each other as shown or discussed may be through some interfaces, indirect couplings or communicative coupling between modules may be electrical or other similar forms, this application is not intended to be limiting. The modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed in a plurality of circuit modules, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present disclosure.

The application provides a method, a device and a storage medium for processing a message, which can be used for network services, for example, for the evolution of 5G network services to integrated services, and can satisfy the bearing of integrated services such as 5G network services (for example, enhanced mobile broadband, large-scale machine communication, high-reliability low-delay communication, and the like), dedicated line for collecting customers, home wide services, and the like. The details will be described below. As shown in fig. 1, a Packet Transport Network (PTN) network system architecture is schematically illustrated, where the PTN network system includes PTN network links such as a controller (not listed in the PTN network system structure of the present application), an access ring, an aggregation ring, and a core ring. The PTN network system includes two access rings, one including nodes A, B, C, D and E, and the other including nodes D, E and J. The aggregation ring includes nodes D, E, F and G. The core ring includes nodes F, G, H and I. The PTN network system mainly carries the first service and the second service of 5G, and may also carry other types of services, which is not limited in the present application. For convenience of description, the node a can be simplified as a, and other nodes are similar and will not be described again. The first service described herein refers to a service for traffic interworking between a 5G base station and a core network, and is, for example, an S1 service. The second service described herein refers to a service for interworking traffic between different 5G base stations, for example, an eX2 service. For reference, in the embodiments of the present application, a network node in an access ring may be referred to as an access ring node, a network node in an aggregation ring may be referred to as an aggregation ring node, and a network node in a core ring may be referred to as a core ring node.

Based on the PTN network system shown in fig. 1, end-to-end L3VPN services (e.g., eX2 services) are deployed within an access ring, for example, L3VPN services deploying node a- > B, eX2 services deploying node C- > a, and S1 services deploying node a- > B- > D- > F- > H. For example, when an eX2 service of a node C- > a is deployed, a source node C adds a destination node label a to a packet, and when the packet passes through each node, a node receiving the packet forwards the packet to a corresponding port according to the outermost node label. Services based on the SR tunnel require hop-by-hop network nodes to forward packet messages, but are limited by the networking scale of the access ring, the fiber distance, and the chip capability of the network nodes, so the overall forwarding efficiency is low. For example, when deploying S1 service of a- > B- > D- > F- > H, node a allocates adjacency labels based on neighboring links, e.g., node a adds adjacency labels J, K, L, and M to the packet. When the message passes through each node, the node receiving the message can forward the message to the corresponding link port according to the outermost adjacent label, and the outermost adjacent label is stripped. The message can only be forwarded based on a strictly displayed path, and the path for forwarding the message nearby is long, which results in the increase of the forwarding delay of the message. Although the PTN network system can adjust the service path and SR tunnel rerouting function by adjusting the label encapsulated by the source node for different types of service traffic, implement isolation and scheduling of physical bandwidth for the service traffic, and the time delay for forwarding the packet based on the SR tunnel is high, it cannot simultaneously meet the requirements of independent scheduling, traffic isolation and low time delay for the integrated service. In order to solve the technical problems, the application mainly provides the following technical scheme:

based on the PTN network system shown in fig. 1, the present application modifies a tunnel deployed between network nodes, for example, a modified PTN network system architecture diagram shown in fig. 2, where the PTN network system shown in fig. 2 includes a controller, an access ring, a convergence ring, and a core ring, nodes in each ring may also be referred to as network nodes, and no distinction is made in the embodiments of the present application. In fig. 2, an SR tunnel and a FlexE tunnel are deployed in both an access ring and a convergence ring, and a mapping relationship between an SR tunnel label and the FlexE tunnel is established. Each network node in the access ring, the aggregation ring and the core ring is a node of a forwarding plane, and the mapping relation between the SR tunnel label and the Flexe tunnel and the SR tunnel label stack can be obtained from the controller. When a message is transmitted in an SR tunnel, the message is mapped to an 'Flexe tunnel between nodes' according to the mapping relation between an SR tunnel label and the FLexe tunnel, a forwarding network between the nodes can forward the message end to end through the 'Flexe tunnel between the nodes', nodes in each ring can forward the message based on a destination Internet Protocol (IP) address in the message, and the requirements of independent scheduling, flow isolation and low delay of comprehensive services can be met at the same time. In some embodiments, both the SR tunnel and the FlexE tunnel may be automatically established based on IGP, and the deployment manners of the SR tunnel and the FlexE tunnel are described below:

1. deploying the SR tunnel:

in some embodiments, an SR-BE tunnel may BE established between access ring nodes interworking with the first service within the access ring, and a mapping relationship between an SR-BE tunnel label and a FlexE tunnel 1 may BE established. The SR-BE tunnel may BE used to transmit an eX2 service packet, for example, an SR-BE tunnel is automatically created between any two access ring nodes interworking with an eX2 service through an IGP protocol. In this embodiment, by establishing SR-BE tunnels only between access ring nodes intercommunicating with the first service and establishing the mapping relationship between these SR-BE tunnels and the FlexE tunnel 1, it is convenient for each node in the access ring to accurately map the first service packet to the corresponding FlexE tunnel 1 according to the mapping relationship when the SR-BE tunnel transmits the first service packet, thereby realizing absolute service isolation and reducing end-to-end forwarding delay.

In some embodiments, SR-TE tunnels and mapping relationships between SR-TE tunnel labels and the FLexE tunnels 2 may be respectively established between access ring nodes interworking with the second service in the access ring, between aggregation ring nodes interworking with the second service in the aggregation ring, and between core ring nodes interworking with the second service in the core ring. The SR-BE tunnel may BE used to transmit S1 service messages. In this embodiment, SR-TE tunnels are only established between access ring nodes intercommunicating with the second service, and a mapping relationship between the SR-TE tunnels and the FLexE tunnel 2 is established, so that when nodes in each ring transmit the second service packet in the SR-BE tunnel, the second service packet can BE accurately mapped to the corresponding FLexE tunnel 2 according to the mapping relationship, and further end-to-end forwarding delay is reduced.

2. Deployment of FlexE tunnel:

in some embodiments, a FLexE tunnel 1 is established between any two access ring nodes within the access ring; and respectively establishing a FLexe tunnel 2 between a convergence link point in the convergence ring and a core ring node in the core ring. For example, as shown in fig. 1, in the access ring, a FLexE tunnel 1 is established between nodes a and B, A and C, A and D, or a and E, respectively, a FLexE tunnel 1 is established between nodes B and C, B and D, or B and E, respectively, a FLexE tunnel 1 is established between nodes C and D, or C and E, respectively, and a FLexE tunnel 1 is established between nodes D and E, respectively. In the convergence ring, an active end-to-end FLexE tunnel 2 (not shown in fig. 2) and a standby end-to-end FLexE tunnel are respectively established between nodes D and H, or D and I. For example, the active FLexE tunnel 2 between the nodes D and H may be an end-to-end tunnel configured by the controller from the node D- > F- > H, and the standby FLexE tunnel 2 between the nodes D and H may be an end-to-end tunnel configured by the controller from the node D- > G- > H. An active end-to-end FLexE tunnel 2 and a standby end-to-end FLexE tunnel 2 (not shown in fig. 2) are respectively established between nodes E and H, or E and I. For example, the active end-to-end FLexE tunnel 2 between the nodes E and H may be an end-to-end tunnel configured by the controller from the node E- > G- > H, and the standby end-to-end FLexE tunnel 2 between the nodes E and H may be an end-to-end tunnel configured by the controller from the node E- > F- > H. Certainly, those skilled in the art may understand that a standby end-to-end FLexE tunnel may not be configured between the aggregation ring node and the core ring node, but in order to ensure the reliability of packet transmission, a standby end-to-end FLexE tunnel is generally configured, so that when an active end-to-end FLexE tunnel fails, path switching may be performed, thereby avoiding service interruption and improving the stability of service transmission.

In this embodiment of the present application, the same FlexE tunnel may carry different SR tunnel services, that is, the SR tunnel 1 for transmitting the first service packet and the SR tunnel 2 for transmitting the second service packet may be mapped to the same FlexE tunnel 1 respectively. For example, as S1 traffic and eX2 traffic are carried by SR-TE tunnel and SR-BE tunnel, respectively, S1 traffic and eX2 traffic may BE mapped to the same FlexE tunnel 1.

Referring to fig. 3, a method for processing a packet according to the present application is described below, where the method is applicable to the PTN network system shown in fig. 2, in an embodiment of the present application, the PTN network system includes a controller, a first network node, a second network node, and a third network node, and a ring in which the first network node, the second network node, and the third network node are located will be described below according to a forwarding scenario. The method comprises the following steps:

301. the controller determines a mapping relationship of the SR tunnel label and the Flexe tunnel.

The SR tunnel label, FlexE tunnel and the mapping relationship are described below, respectively.

The SR tunnel label is a tunnel label of the SR tunnel. In some embodiments, the SR tunnel tag may BE a SR-BE tunnel tag or a SR-TE tunnel tag. When the SR tunnel label is an SR-BE tunnel label, the Flexe tunnel mapped with the SR tunnel label can bear a first service; and when the SR tunnel label is the SR-TE tunnel label, the service corresponding to the second message is a second service.

In some embodiments, the SR-BE tunnel label may BE a node label of a network node. For example, if the first network node and the second network node are both nodes in the same access ring, the SR-BE tunnel label is a node label of the second network node. For another example, if the first network node is an access ring node and the second network node is a convergence ring node, the SR-BE tunnel label is a node label of the second network node. For another example, if the first network node, the second network node, and the third network node are located in the first access ring, the aggregation ring, and the second access ring in sequence (i.e., the first network node communicates with the third network node through the second network node), when a packet is transmitted between the first network node and the second network node, the SR-BE tunnel label is a node label of the second network node; and when the message is transmitted between the second network node and the third network node, the SR-BE tunnel label is the node label of the third network node.

In some embodiments, the SR-TE tunnel label is an outermost adjacent label of a SR-TE tunnel label stack.

The Flexe tunnel is an end-to-end Flexe tunnel disposed between the first network node and the second network node. The first network node and the second network node may include an intermediate node therebetween, and the end-to-end FlexE tunnel between the first network node and the second network node may be an end-to-end FlexE tunnel between nodes 1- > node 2 automatically established according to IGP, or an end-to-end FlexE tunnel between nodes 1- > node 3- > node 4- > node 2 automatically established according to IGP.

In some embodiments, the mapping comprises a mapping between a node label of a network node and a FlexE tunnel, or comprises a mapping between an outermost adjacency label and a FlexE tunnel.

302. The controller sends the mapping relationship to the first network node.

303. The first network node receives the mapping from the controller.

304. First network node obtains message including segment routing SR tunnel label

In one embodiment, acquiring a packet including a segment routing SR tunnel label includes:

the first network node receives a first message, which includes a destination IP address used for selecting an SR tunnel label to be encapsulated into the first message, so that the SR tunnel label encapsulated into the first message can be accurately mapped to a corresponding FlexE tunnel.

The first network node encapsulates a segment routing SR tunnel label in the first message according to the destination IP address to obtain a second message including the SR tunnel label, where the second message is the message obtained in step 304, and in this embodiment, the first message and the second message are not distinguished.

The first network node may be a source node for forwarding a packet in the PTN network system, or may be an intermediate node for forwarding a packet. For example, the packet is from node a- > node B- > node D- > node F, where node a is the source node for forwarding the packet, and both node B and node D are intermediate nodes for forwarding the packet. In some specific embodiments, the first network node may be node a, node B, or node D. When the first network node is the node a, after receiving the first packet, the node a needs to encapsulate an SR tunnel label in the first packet according to the destination IP address in the first packet, to obtain a second packet. When the first network node is the node B, after the node B obtains the packet, the packet does not need to be encapsulated, and the packet received by the node B already carries the SR tunnel label encapsulated by the node a. The node D has the same structure and is not described in detail.

In some embodiments, the first network node may encapsulate the SR-BE tunnel label or the SR-TE tunnel label in the first message.

305. And the first network node determines a Flexe tunnel mapped with the SR tunnel label according to the mapping relation.

306. And the first network node sends the message comprising the SR tunnel label to the second network node through the Flexe tunnel.

In the embodiment of the application, after determining the mapping relationship between the SR tunnel label and the FlexE tunnel, the controller issues the mapping relationship to the corresponding first network node, so that the first network node can send a message to the second network node according to the FlexE tunnel determined by the mapping relationship. The service bearing is completed through the FLEXE tunnel and the SR tunnel, the requirements of independent scheduling and flow isolation of the integrated service can be met, and the service delay can be reduced. In addition, in the embodiment of the application, the SR tunnel and the FlexE tunnel are fully fused, and a fully interconnected (fullmesh) FlexE tunnel does not need to be established, so that the number of FlexE tunnels required to be deployed in the PTN network system is greatly reduced, and the complexity of configuration and operation of the FlexE tunnels is further reduced.

For example, in the access ring, the access ring node forwards the second packet according to the mapping relationship between the SR tunnel label and the FlexE tunnel 1. Based on the mapping relation, the message transmitted in the SR tunnel can be transmitted to the Flexe tunnel 1, so that the transmission delay of the message in the access ring is reduced, the transmission efficiency is improved, and the smoothness of the service is guaranteed. For example, the forwarding delay of the source node of the FlexE tunnel is about 10 microseconds, and the forwarding delay of the intermediate node is less than 5 microseconds. If the access ring comprises n access ring nodes, the maximum forwarding delay L of the message in all the access ring nodes in the access ring_maxL1 × 2+ L2 × n-2, L1 is the forwarding delay of the source node, L2 is the forwarding delay of the intermediate node, and n is a positive integer. For example, when n is 8, L_max10 × 2+5 (8-2) ═ 50 microseconds, and when the L3VPN is used to forward the packet in the existing mechanism, the forwarding delay of a single IP packet device in the access ring is about 50 microseconds, and then, when there are 8 access ring nodes in an access ring, the forwarding delay of the packet in the access ring is about 400 microseconds. Therefore, compared with the forwarding delay of the IP grouping equipment in the existing mechanism, the forwarding delay can be reduced by about 90%.

Several forwarding scenarios for forwarding the second packet from the first network node to the second network node are introduced below according to the ring where the first network node and the second network node are located, where the forwarding scenarios at least include the following forwarding scenarios.

(1) For services within the same access ring.

For example, when the first network node and the second network node are both nodes in the access ring, the controller configures a mapping relationship for the first network node, so that in the access ring, the first network node can communicate with the second network node in the access ring through the mapped FlexE tunnel, thereby reducing the forwarding delay between the access ring nodes in the same access ring.

In some embodiments, the first network node may map the second packet to an end-to-end FlexE tunnel 1 between a first network node and a second network node according to a mapping relationship between a node label of a destination node (e.g., the second network node) and the FlexE tunnel 1, so as to forward the second packet. For convenience of understanding, the following describes, by taking an eX2 service as an example, a procedure of establishing a mapping relationship between an SR tunnel label and a FlexE tunnel after configuring the FlexE tunnel, and a procedure of forwarding a packet according to the mapping relationship between the SR tunnel label and the FlexE tunnel.

As shown in fig. 4a, within the first access ring (A, B, C, D, E), taking the eX2 traffic deployed between C- > a as an example, node C is a source node (which may be a first network node, for example), and node a is a destination node (which may be a second network node, for example). The controller configures a mapping relationship between "node label a (i.e. the node label of node a, for convenience of description, the following similarities are all referred to here)" and "FlexE tunnel 1 between C and a (also referred to as FlexE tunnel 1 from C- > a)" at the entry of node C. And the node C encapsulates the node label A to the message, and maps the message to 'Flexe tunnel 1 between the node C and the node A' according to the mapping relation. Due to the eX2 service interworking between C and A, the forwarding network between C and A mainly performs end-to-end forwarding according to the Flexe tunnel 1 between C and A.

Therefore, in the eX2 service in the same access ring, the existing node label of the destination node is used as the SR-BE tunnel label, and the first network node can accurately map the second message to the corresponding Flexe tunnel 1 according to the node label of the destination node, and does not need to introduce a new identifier for establishing a mapping relation with the Flexe tunnel into the first message, thereby reducing the encapsulation operation on the first message.

(2) For a forwarding scenario across the access ring.

For example, the PTN network system includes a first access ring and a second access ring, the first network node being a node in the first access ring, and the second network node being a node in the aggregation ring. In step 304, the destination IP address of the first packet is an IP address of a third network node in the second access ring, and the first network node communicates with the third network node through the second network node. And the second message is forwarded to the third network node from the first network node through the second network node. When the second network node communicates with the third network node, the second network node may determine, based on the mapping relationship between the SR tunnel tag 1 and the FlexE tunnel 1 acquired from the controller, the FlexE tunnel 1 mapped with the SR tunnel tag 1, and then forward the packet to the third network node based on the FlexE tunnel 1. The second packet may be forwarded to the third network node via the mapped FlexE tunnel 1. The communication mode between the second network node and the third network node may refer to the communication mode between the first network node and the second network node, and may also adopt other communication modes, and the specific communication mode is not limited in this application.

In this embodiment of the application, the controller configures mapping relationships between SR tunnel labels and FlexE tunnels for the first network node, the second network node, and the third network node, respectively. For example, the controller configures a mapping relationship between SR tunnel tag 1 and FlexE tunnel 1 for a first network node, configures a mapping relationship between SR tunnel tag 2 and FlexE tunnel 1 for a second network node, and configures a mapping relationship between SR tunnel tag 3 and FlexE tunnel 1 for a third network node. The FlexE tunnel 1 and the FlexE tunnel 2 may be the same or different FlexE tunnels.

It can be seen that, by configuring the mapping relationship for the first network node, the first network node in the access ring can communicate with the second network node in the convergence ring through the mapped FlexE tunnel, thereby reducing the forwarding delay from the access ring to the convergence ring. In addition, after the second packet is forwarded to the second network node, the second network node sends the second packet to the third network node through the mapped FlexE tunnel, so that communication between network nodes in different access rings is realized, and forwarding delay between network nodes in different access rings is reduced.

In some embodiments of an across-access-ring forwarding scenario, the first network node may be a node in the aggregation ring and the second network node is a node in the access ring. In the first access ring, the first network node forwards the second message according to the mapping relation between the node label of the second network node and the Flexe tunnel 1, and in the second access ring, the second network node forwards the second message according to the mapping relation between the node label of the third network node and the Flexe tunnel 2.

For example, as shown in fig. 5, when eX2 traffic is deployed on the first access ring (A, B, C, D, E) and the second access ring (J, D, E), taking eX2 traffic between C- > J as an example, node C is the source node and node J is the destination node. The controller configures a mapping relation between a node label D and a FLexe tunnel 1 between C and D at the entrance of the node C. And encapsulating the node label D to the message at the entrance of the node C, and mapping the message to 'Flexe tunnel 1 between the C and the D' according to the mapping relation. After the message leaves 'Flexe tunnel 1 between C and D', the controller configures a mapping relation between 'node label J' and 'Flexe tunnel 1 between D and J' at the entrance of the node D, and maps the message to 'Flexe tunnel 2 between D and J' through the mapping relation, namely forwards the message to a second access ring (J, D, E). In the forwarding plane, the nodes C and D both forward the message based on the destination IP address, and similarly, the forwarding network between C and D mainly forwards the message end to end according to the 'Flexe tunnel 1 between C and D', and the forwarding network between D and J mainly forwards the message end to end according to the 'Flexe tunnel 2 between D and J'.

As can BE seen, for the eX2 service crossing the access rings, the message is mapped from the first access ring to the aggregation ring node according to the SR-BE label, and then the aggregation ring node maps the message from the aggregation ring node to the second access ring according to the mapping relationship, thereby implementing the eX2 service crossing the access rings. In the embodiment, the fully interconnected FlexE tunnel 1 does not need to be established between the first access ring and the second access ring for the eX2 service, and the eX2 service crossing the access rings can be realized, so that the configuration and management of the FlexE tunnel crossing the access rings are reduced, the networking complexity of the whole access ring is also reduced, and the management is convenient.

(3) And when the first network node is a node in the access ring and the second network node is a node in the aggregation ring, the first network node forwards the second packet to the aggregation ring through a FLexe tunnel and an SR tunnel in the access ring. It can be seen that, by configuring a mapping relationship for a first network node, the first network node in the access ring can communicate with a second network node in the convergence ring through the mapped FlexE tunnel, which can reduce the forwarding delay from the access ring to the convergence ring and ensure the smoothness of the service.

In some embodiments, the first network node may map the packet to a FlexE tunnel using the outermost adjacency label of the SR-TE tunnel label stack. In the forwarding scenario (3) of the embodiment of the present application, the flow of forwarding the first packet from the first network node to the second network node may refer to any one of the following a1 and b 1:

a1, in the access ring, the first network node adds a first SR-TE tunnel label stack in the first message to obtain a second message. And the first network node maps the second message to an end-to-end Flexe tunnel 1 of the second message between the first network node and the second network node according to the mapping relation between the outermost adjacent label of the first SR-TE tunnel label stack and the FLexe tunnel 1. If other intermediate nodes exist between the first network node and the second network node, when the second message is forwarded in the access ring, the first network node serving as the source node maps the second message to the corresponding Flexe tunnel 1 according to the current outermost adjacent label of the second message, when the second message reaches the intermediate node, the intermediate node does not need to perform grouping processing on the second message based on the L3VPN, and the intermediate node continues to forward the second message through the mapped Flexe tunnel until the second message reaches the second network node in the aggregation ring. And when the second message reaches the second network node, the second network node removes the first SR tunnel label stack of the second message.

b1, in the access ring, the first network node adds a first SR-TE tunnel label stack in the first message to obtain a second message. And the first network node maps the second message to the FLexe tunnel 1 of the message between the first network node and the second network node according to the mapping relation between the outermost adjacent label of the first SR-TE tunnel label stack and the FLexe tunnel 1. If other intermediate nodes exist between the first network node and the second network node, when the second message is forwarded in the access ring, the first network node serving as the source node removes the current outermost adjacent label of the second message, and maps the second message to the corresponding FLexe tunnel 1, and when the second message reaches the intermediate nodes, the intermediate nodes also remove the current outermost adjacent label of the second message until the second message reaches the second network node in the aggregation ring. When the second packet reaches the second network node, the first SR tunnel label stack of the second packet has been completely removed.

In some embodiments, the first SR-TE tunnel label stack configured by the first network node is only used to send the second packet from the access ring to the aggregation ring, so as to reduce the number of labels required to be configured by the first network node serving as the source node, thereby improving packet encapsulation efficiency.

(4) When the first network node is a node in the convergence ring and the second network node is a node in the core ring, the controller configures a mapping relationship for the first network node, so that the first network node in the convergence ring can communicate with the second network node in the core ring through the mapped Flexe tunnel, thereby reducing the forwarding delay from the convergence ring to the core ring and ensuring the smoothness of the service. In the forwarding scenario (4) of the embodiment of the present application, the flow of forwarding the second packet from the first network node to the second network node may refer to any one of the following a2 and b 2:

a2, after the second message reaches the second network node in the convergence ring, the second network node adds a second SR-TE tunnel label stack in the second message in the convergence ring to obtain a third message. When the second network node forwards the third packet according to the mapping relationship between the SR tunnel label and the FlexE tunnel 2, the third packet may be mapped to the FlexE tunnel 2 between the second network node and the core ring node according to the mapping relationship between the outermost adjacent label of the second SR-TE tunnel label stack and the FlexE tunnel 2, so that the third packet is forwarded to the core ring through the FlexE tunnel 2.

b2, when the second message reaches the second network node in the convergence ring, the second network node adds a second SR-TE tunnel label stack in the second message in the convergence ring to obtain a third message. When the second network node forwards the third packet according to the mapping relationship between the SR tunnel label and the FLexE tunnel 2, the third packet may be mapped to the FLexE tunnel 2 between the second network node and the core ring node according to the mapping relationship between the outermost adjacent label of the second SR-TE tunnel label stack and the FLexE tunnel 2, so that the third packet is forwarded to the core ring through the FLexE tunnel 2.

In some embodiments, the second SR-TE tunnel label stack configured by the second network node is only used to send the third packet from the aggregation ring to the core ring, or only used to send the third packet from the aggregation ring to the second access ring, so as to reduce the number of labels that need to be configured by a source node (e.g., the first network node in forwarding scenario 3) that forwards the packet, thereby improving the packet encapsulation efficiency.

In some embodiments, the SR-BE tunnel label may BE a node label of a network node. By adopting the node label of the existing destination node as the SR-BE tunnel label, the second network node can accurately map the message to the corresponding Flexe tunnel 2 according to the node label of the destination node, and does not need to introduce a new identifier for establishing a mapping relation with the Flexe tunnel into the message, thereby reducing the packaging operation of the message.

As can be seen from the foregoing forwarding scenarios (3) and (4), when the PTN network system deploys the second service, the packet of the second service is sequentially forwarded from the access ring, the aggregation ring, and the core ring, and finally reaches the core network device. In the following, two message forwarding processes in this embodiment are respectively described by taking forwarding an S1 service message as an example:

for example, as shown in FIG. 4a, Flexe tunnel 1 from A- > B- > D is automatically established based on IGP, and Flexe tunnel 2 from D- > F- > H is configured. In the access ring, a node A is a source node, a controller adds an SR-TE tunnel label stack to a message at the node A, the added SR-TE tunnel label stack is an outer layer 'adjacent label J/K', and meanwhile, the controller configures a mapping relation between the outer layer 'adjacent label J' and a 'Flexe tunnel 1' of 'Slave A- > B- > D'. Thus, in the forwarding plane of the access ring, the nodes a and D can forward the S1 service packet based on the destination IP address. Specifically, in the process of forwarding a packet from the FlexE tunnel 1 of a- > B- > D, after the packet reaches an intermediate node (for example, node B), node B does not need to perform packet processing on the packet based on L3VPN, and node B continues to forward the packet to node D through the "FlexE tunnel 1 of a- > B- > D" mapped, and when the packet reaches node D, node D removes the SR-TE tunnel label stack of the packet. If other intermediate nodes exist between the nodes A and D, the mechanism of forwarding the message by the other intermediate nodes based on the Flexe tunnel 1 is the same, and the details are not repeated.

In the aggregation ring, the controller adds an SR-TE tunnel label stack (i.e., an adjacency label L/M) to the packet at the node D, and configures a mapping relationship between the outermost layer "adjacency label L" and the FlexE tunnel 2 "of the" corresponding D- > F- > H, and at the node D, encapsulates the packet to the FlexE tunnel 2 "of the" slave D- > F- > H through the outermost layer "adjacency label L" of the packet. In the forwarding plane of the aggregation ring, the message may be forwarded based on the destination IP address for the S1 service message. Specifically, the message is forwarded from the Flexe tunnel 2 of D- > F- > H. After the packet reaches an intermediate node (for example, node F), node F does not need to perform packet processing on the packet based on L3VPN, and node F continues to forward the packet to node H through the mapped "FlexE tunnel 2 from D- > F- > H", and when the packet reaches node H, node H removes the SR-TE tunnel label stack of the packet. If there are other intermediate nodes between the node D and the node H, the mechanism for forwarding the packet based on the FlexE tunnel 2 is the same as that of the other intermediate nodes, which is not described in detail. And when the message reaches the node H, the message leaves from the Flexe tunnel 2 of D- > F- > H, and the node H sends the message to the gateway equipment of the core network.

By way of another example, as shown in fig. 4B, a FLexE tunnel 1 from a- > B- > D is automatically established based on IGP, and a FLexE tunnel 2 from D- > F- > H is configured. In the access ring, a node A is a source node, a controller adds an SR-TE tunnel label stack to a message at the node A, the added SR-TE tunnel label stack is an outer layer ' adjacent label J/K ', and meanwhile, the controller configures a mapping relation between the outer layer ' adjacent label J ' and a FLexe tunnel 1 ' corresponding to A- > B- > D. Thus, in the forwarding plane of the access ring, the nodes A, B and D can forward the S1 service packet based on the destination IP address. Specifically, in the process of forwarding a packet from a FLexE tunnel 1 of a- > B- > D, after the packet reaches an intermediate node (for example, a node B), the node B removes an adjacent label K in the packet, and forwards the packet to the node D through the FLexE tunnel 1 mapped by the adjacent label K, and when the packet reaches the node D, an SR-TE tunnel label stack of the packet is completely removed. If other intermediate nodes exist between the nodes A and D, the other intermediate nodes are the same as the mechanism for forwarding the message based on the FLexe tunnel 1, and the details are omitted.

In the convergence ring, the controller configures the mapping relation between the outermost layer ' adjacent label L ' and the ' FLEXE tunnel 2 corresponding to D- > F- > H, and sends the mapping relation to the node D. After receiving the message, the node D adds an SR-TE tunnel label stack (namely an adjacent label L/M) to the message, and encapsulates the message to a FLEXE tunnel 2 corresponding to D- > F- > H through the outermost layer 'adjacent label L' of the message. In the forwarding plane of the aggregation ring, the message may be forwarded based on the destination IP address for the S1 service message. Specifically, the message is forwarded from a FLexE tunnel 2 of D- > F- > H. After the message reaches an intermediate node (for example, node F), the node F removes the adjacent label M in the message, and forwards the message to the node H through the FLexE tunnel 2 mapped by the adjacent label M, and when the message reaches the node H, the SR-TE tunnel label stack of the message is completely removed. If other intermediate nodes exist between the node D and the node H, the other intermediate nodes are similar to the mechanism for forwarding the packet based on the FLexE tunnel 2, and are not described again. And when the message reaches the node H, stripping the message from the FLexe tunnel 2 corresponding to the D- > F- > H, and sending the message to the gateway equipment of the core network.

It can be seen that, the implementation scheme of mapping the message to the FlexE tunnel based on the outermost adjacent label of the SR-TE tunnel label stack can reduce the number of labels encapsulated by the SR-TE tunnel label, thereby improving the overall encapsulation efficiency of the message, and also can improve the forwarding performance of the communication system and the maximum specification supported by the Maximum Transmission Unit (MTU). Meanwhile, because the eX2 service message in the access ring or the eX2 service message crossing the access ring can be forwarded based on the Flexe tunnel, the time delay for forwarding the eX2 service message by the forwarding network between the nodes can be limited within 5 microseconds, for example, when the message is forwarded through the Flexe tunnel with C- > A- > B- > D, the forwarding time delay of the message at the middle nodes A and B is within 5 microseconds, and thus, the scheme of mapping to the Flexe tunnel adopted in the application can reduce the end-to-end transmission time delay and realize the absolute isolation of the service.

In addition, in the present embodiment, only the first network node as the source node adds the adjacent labels or node labels of all forwarding paths, and the intermediate node removes the labels and does not add any labels any more. In each ring, only the label in the ring is configured, and the source node of the access ring does not need to be configured for all labels of the whole PTN network system, so that the number of the labels in the access ring can be reduced, and the encapsulation efficiency of the message in the access ring is improved.

Optionally, in some embodiments of the present application, the controller may further establish a mapping relationship between different SR tunnel labels and the same FlexE tunnel, so that SR-TE tunnels corresponding to at least two services are both mapped to the same FlexE tunnel. By the method, different services can be borne by the same Flexe tunnel, and isolation among different services can be realized.

For example, if a first S1 service and a second S1 service are deployed at the same time, different SR-TE tunnels are deployed for the first S1 service and the second S1 service, respectively, and the SR-TE tunnels deployed for the first S1 service and the second S1 service are both mapped to the same FlexE tunnel. In this way, the same FlexE tunnel can carry different S1 services, and isolation between different S1 services can be realized. For example, when a PTN network system deploys 4G L3VPN service and 5G L3VPN service, different SR-TE tunnels may be respectively deployed for 4G L3VPN service and 5G L3VPN service from an access ring to a core ring (e.g., from node a- > H), and the SR-TE tunnels deployed for 4G L3VPN service and 5G L3VPN service may be mapped to the same FlexE tunnel, so that the same FlexE tunnel can carry different L3VPN services, and isolation between different L3VPN services can be achieved at the same time, thereby compensating for the defect when only SR tunnels are deployed. And a fully interconnected Flexe tunnel is not required to be established among all nodes of the PTN network system, and the complexity of planning the Flexe tunnel is reduced.

Optionally, in some embodiments of the present application, the core network gateway may sink to the aggregation ring nodes (e.g., nodes D and E in fig. 2), so that the bandwidth convergence rate of the access ring is relatively large, the bandwidth convergence rate from the aggregation ring nodes (e.g., nodes D and E in fig. 2) to the core ring is relatively small, and the bandwidth convergence rate between the access ring and the aggregation ring needs to be considered when deploying the bandwidth of the FlexE tunnel. And for the aggregation ring nodes in the aggregation ring, the bandwidth of the Flexe tunnel corresponding to the aggregation node is obtained according to the number of base stations to be accessed by the aggregation ring nodes and the bandwidth convergence ratio from the access ring to the aggregation ring. For example, the aggregation ring node plans to access 8 base stations of 5G, then the bandwidth of the FlexE tunnel deployment is W, where W is 8 × 5G × 1/4 — 10G, where 1/4 is the bandwidth convergence ratio from the access ring to the aggregation ring. Therefore, in the application, the same FlexE tunnel can be used for bearing different L3VPN services, and a fixed FlexE tunnel bandwidth does not need to be planned for each service flow, so that on the premise that a base station plans a fixed bandwidth, a very large bandwidth of core network bearing equipment is not needed, and bandwidth statistical multiplexing of base station traffic can be realized to the maximum extent.

Optionally, in some embodiments of the present application, each access ring node in the access ring corresponds to a different IGP domain; and the IGP domain corresponding to the convergence link point in the convergence ring is the same as the IGP domain corresponding to the core link point in the core ring. For example, when nodes D and E deploy layered L3VPN traffic: ensuring that different access ring nodes configure separate IGP domains (e.g., nodes A, B, C, D and E are both separate IGP domains in the access ring link, and ensuring that all aggregation ring nodes and core ring nodes are deployed in the same IGP domain, i.e., node D, E, F, G is in the aggregation ring link, and node E, G, H and I-node are both the same IGP domain in the core ring link). Therefore, the L3VPN is layered at the aggregation ring nodes by dividing the IGP domain, so that the overlarge scale of the L3VPN domain can be avoided, mutual diffusion routing between access rings is further avoided, and the operation and maintenance complexity between the access ring nodes is reduced.

The technical features introduced in the foregoing embodiments, such as technical features of deploying an SR tunnel or a FlexE tunnel, mapping relationships, forwarding a packet through the FlexE tunnel, a first service, a second service, an SR tunnel label stack, a FlexE tunnel bandwidth calculation method, and the like, are also applicable to the embodiments corresponding to fig. 6 to 8 in the present application, and subsequent similar parts are not described again.

The above describes a method for processing a packet in the present application, and a controller and a network node for processing a packet, which execute the above method, are described below.

As shown in fig. 6, a schematic structural diagram of a controller, a controller in this embodiment of the application can implement steps of configuring an SR tunnel or a FlexE tunnel, determining a mapping relationship, and sending the mapping relationship, which are executed by the controller in the embodiment corresponding to any one of fig. 2 to fig. 5. The functions realized by the controller can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. The controller may include a transceiver module and a processing module, and the processing module may be configured to control transceiving operations of the transceiver module. The function of the processing module may refer to operations performed by the controller in the embodiment corresponding to any one of fig. 2 to 5, such as establishing an SR tunnel or a FlexE tunnel, and determining a mapping relationship, which are not described herein again. The function of the transceiver module may be implemented by referring to operations such as issuing a mapping relationship to a network node by a controller in any of the embodiments corresponding to fig. 2 to 5, and the processing module may be configured to control the transceiver module to perform the transceiving operation.

In the embodiment of the application, the controller is applied to a Packet Transport Network (PTN) network system, and the PTN network system further comprises a first network node and a second network node. The controller includes:

the processing module is used for determining the mapping relation between the segment routing SR tunnel label and the Flexe tunnel;

a transceiver module, configured to send the mapping relationship to the first network node, so that the first network node sends, according to the mapping relationship, a packet including the SR tunnel tag to the second network node through the FlexE tunnel, where the FlexE tunnel is an end-to-end FlexE tunnel disposed between the first network node and the second network node.

In some possible embodiments, the first network node and the second network node are both nodes in the access ring.

In some possible embodiments, the first network node is a node in the access ring, and the second network node is a node in the aggregation ring.

In some possible embodiments, the first network node is a node in the aggregation ring, and the second network node is a node in the core ring.

In some possible embodiments, the first network node is a node in the first access ring, the second network node is a node in the aggregation ring, the destination IP address of the second packet is an IP address of a third network node in the second access ring, and the first network node communicates with the third network node through the second network node.

As shown in fig. 7, a schematic structural diagram of a network node, a network node in this embodiment of the application can implement steps of receiving a packet, receiving a mapping relationship, encapsulating an SR tunnel tag in a first packet, determining a FlexE tunnel, and forwarding the packet through the FlexE tunnel, which are executed by a first network node in the embodiment corresponding to any one of fig. 2 to fig. 5. The functions realized by the controller can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions, which may be software and/or hardware. The network node may comprise a transceiver module and a processing module, and the processing module may be configured to control transceiving operations of the transceiver module. The function of the processing module may refer to operations of encapsulating an SR tunnel tag in a first message, determining a FlexE tunnel, and the like, which are executed by a first network node in the embodiment corresponding to any one of fig. 2 to 5, and are not described herein again. The function of the transceiver module may refer to operations of obtaining a packet, receiving a mapping relationship, forwarding a packet through a FlexE tunnel, and the like, which are executed by a first network node in the embodiment corresponding to any one of fig. 2 to 5.

In the embodiment of the present application, the network node is used as a first network node, the first network node is applied to a packet transport network PTN network system, and the PTN network system further includes a second network node.

The processing module may be configured to obtain a packet including a segment routing SR tunnel label.

The processing module is further configured to determine, based on a mapping relationship between the SR tunnel tag and a flexible ethernet FlexE tunnel, the FlexE tunnel mapped with the SR tunnel tag;

the transceiver module may be configured to send the packet including the SR tunnel tag to the second network node through the FlexE tunnel, where the FlexE tunnel is an end-to-end FlexE tunnel disposed between the first network node and the second network node.

In some possible embodiments, the processing module is configured to: and receiving a first message, wherein the first message carries a destination Internet Protocol (IP) address.

In some possible embodiments, the PTN network system further includes a controller, and before the receiving the first packet, the transceiver module is further configured to:

and receiving the mapping relation sent by the controller.

In some possible embodiments, the PTN network system further comprises a convergence ring and a core ring, wherein the first network node is a node in the convergence ring and the second network node is a node in the core ring.

Fig. 8 is a schematic structural diagram of a communication device for processing a message according to an embodiment of the present disclosure, which may include at least one processor, at least one transceiver, a memory, and at least one bus. Wherein, at least one processor, at least one transceiver and the memory can be connected by a bus or other means, wherein the connection by the bus is taken as an example in fig. 8.

The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory (NVRAM). The memory stores an operating system and program instructions, executable modules or data structures, or subsets thereof, or expanded sets thereof, wherein the program instructions may include various operational instructions for performing various operations. The operating system may include various system programs for performing various basic tasks and for handling hardware-based tasks.

The processor, which may also be referred to as a Central Processing Unit (CPU), may control the operation of the communication device that processes the messages. In a specific application, the components of the software upgrade management device are coupled together by a bus, wherein the bus may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. But for clarity of illustration the various buses are referred to as buses in figure 8.

It should be noted that in the embodiments of the present application (including the embodiments shown in fig. 6 and fig. 7), all entity devices corresponding to the transceiver modules may be transceivers, and all entity devices corresponding to the processing modules may be processors. Each of the devices shown in fig. 6 and 7 may have a structure as shown in fig. 8, when one of the devices has the structure as shown in fig. 8, the processor and the transceiver in fig. 8 implement the same or similar functions of the processing module and the transceiver module provided in the embodiment of the device corresponding to the device, and the memory in fig. 8 stores program codes that the processor needs to call when executing the method for processing a message. Wherein the transceiver may also be replaced by a receiver and a transmitter, which may be the same or different physical entities. When they are the same physical entity, they may be collectively referred to as a transceiver, which may be, for example, a Radio Frequency (RF) circuit. The memory may be integrated in the processor or may be provided separately from the processor.

The method for processing a packet disclosed in the embodiments of the present application may be applied to the processor shown in fig. 8, or implemented by the processor shown in fig. 8. For example, in some embodiments, the processor in fig. 8 may call the program instructions stored in the memory, and the processor specifically executes the program code that needs to be called when the method for processing a message in the embodiment of the present application is executed.

For example, when the controller has a structure as shown in fig. 8, the memory in fig. 8 stores program codes that the processor needs to call when executing the above-described method of processing a message by the controller. Specifically, the processor in FIG. 8 is capable of invoking program code in memory to perform the following operations:

determining a mapping relation between a segment routing SR tunnel label and a Flexe tunnel;

and sending the mapping relation to the first network node through the transceiver, so that the first network node sends a message including the SR tunnel label to the second network node through the Flexe tunnel according to the mapping relation, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

For another example, when the network node has the structure shown in fig. 8, the memory in fig. 8 stores program codes that the processor needs to call when executing the above-described method of processing a packet by the network node. Specifically, the processor in FIG. 8 is capable of invoking program code in memory to perform the following operations:

acquiring a message comprising a Segment Routing (SR) tunnel label;

determining the Flexe tunnel mapped with the SR tunnel label based on the mapping relation between the SR tunnel label and the flexible Ethernet Flexe tunnel;

controlling the transceiver to send the packet including the SR tunnel label to the second network node through the FlexE tunnel, where the FlexE tunnel is an end-to-end FlexE tunnel disposed between the first network node and the second network node.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The technical solutions provided by the present application are introduced in detail, and the present application applies specific examples to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understand the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of processing a message, the method being performed by a controller, the method comprising:

determining a mapping relation between a segment routing SR tunnel label and a flexible Ethernet Flexe tunnel;

and sending the mapping relation to a first network node, so that the first network node sends a message including the SR tunnel label to a second network node through the Flexe tunnel according to the mapping relation, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

2. The method of claim 1, wherein the first network node and the second network node are both access network nodes.

3. The method of claim 1, wherein the first network node is a node in an access network and the second network node is a node in an aggregation network.

4. The method of claim 1, wherein the first network node is a node in an aggregation network and the second network node is a node in a core network.

5. The method according to any of claims 1-4, wherein the SR tunnel label is a best effort forwarding based segment routing, SR-BE, tunnel label.

6. The method according to any of claims 1-4, wherein the SR tunnel label is a traffic engineering based segment routing, SR-TE, tunnel label.

7. The method according to claim 3, wherein the bandwidth of the Flexe tunnel corresponding to the aggregation network node in the aggregation network is obtained according to the number of base stations to be accessed by the aggregation network node and the bandwidth convergence ratio from the access network to the aggregation network.

8. A method of processing a packet, the method being performed by a first network node, the method comprising:

acquiring a message comprising a Segment Routing (SR) tunnel label;

and sending the message including the SR tunnel label to a second network node through the Flexe tunnel, wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

9. The method according to claim 8, wherein before the obtaining the packet including the Segment Routing (SR) tunnel label, the method further comprises:

and receiving the mapping relation sent by the controller.

10. The method according to claim 8 or 9, wherein the first network node and the second network node are both nodes in an access network.

11. A method according to claim 8 or 9, wherein the first network node is a node in an access network and the second network node is a node in an aggregation network.

12. The method according to claim 8 or 9, wherein the first network node is a node in an aggregation network and the second network node is a node in a core network.

13. The method according to claim 8 or 9, wherein the SR tunnel label is a best effort forwarding based segment routing SR-BE tunnel label.

14. The method of claim 10, wherein the SR tunnel label is an SR-BE tunnel label.

15. The method of claim 11, wherein the SR tunnel label is an SR-BE tunnel label.

16. The method of claim 12, wherein the SR tunnel label is an SR-BE tunnel label.

17. The method according to claim 8 or 9, wherein the SR tunnel label is a traffic engineering based segment routing SR-TE tunnel label.

18. The method of claim 10, wherein the SR tunnel label is an SR-TE tunnel label.

19. The method of claim 11, wherein the SR tunnel label is an SR-TE tunnel label.

20. The method of claim 12, wherein the SR tunnel label is an SR-TE tunnel label.

21. A controller, characterized in that the controller comprises:

the processing module is used for determining the mapping relation between the segment routing SR tunnel label and the flexible Ethernet Flexe tunnel;

a transceiver module, configured to send the mapping relationship to a first network node, so that the first network node sends, according to the mapping relationship, a packet including the SR tunnel tag to a second network node through the FlexE tunnel, where the FlexE tunnel is an end-to-end FlexE tunnel disposed between the first network node and the second network node.

22. The controller according to claim 21, wherein the first network node and the second network node are both nodes in an access network.

23. The controller of claim 21, wherein the first network node is a node in an access network and the second network node is a node in an aggregation network.

24. The controller according to claim 21, wherein the first network node is a node in an aggregation network and the second network node is a node in a core network.

25. A network node acting as a first network node, the first network node comprising:

a memory storing instructions;

a processor coupled with the memory, the processor executing the instructions to cause the first network node to:

acquiring a message comprising a Segment Routing (SR) tunnel label;

sending the message including the SR tunnel label to a second network node through the Flexe tunnel;

wherein the Flexe tunnel is an end-to-end Flexe tunnel deployed between the first network node and the second network node.

26. The network node of claim 25, wherein the processor executes the instructions to cause the first network node to further:

and receiving the mapping relation sent by the controller.

27. The network node according to claim 25 or 26, wherein the first network node and the second network node are both nodes in an access network.

28. The network node according to claim 25 or 26, wherein the first network node is a node in an access network and the second network node is a node in an aggregation network.

29. The network node according to claim 25 or 26, wherein the first network node is a node in an aggregation network and the second network node is a node in a core network.

30. A controller, characterized in that the controller comprises:

a memory storing instructions;

a processor for executing the instructions, causing the controller to perform the method of any of claims 1-7.

31. A network node, comprising:

a memory storing instructions;

a processor configured to execute the instructions to cause the network node to perform the method of any of claims 8-20.

32. A computer storage medium storing instructions that, when executed on a computer, cause the computer to perform a method performed by a controller as claimed in any of claims 1-7, or perform operations performed by a first network node as claimed in any of claims 8-20.

33. A communication system comprising the controller of any of claims 21-24 and 30 and the network node of any of claims 25-29 and 31.