CN115695201A - Bandwidth resource allocation method and system based on Flexe Channel priority - Google Patents
Bandwidth resource allocation method and system based on Flexe Channel priority Download PDFInfo
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Abstract
The invention provides a method and a system for allocating bandwidth resources based on Flexe Channel priority, wherein the method comprises the steps of grouping acquired service information according to priority; constructing a Flexe Channel, and placing a Flexe Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code represents the priority corresponding to the Flexe Channel carrying differentiated services; the channel state is normal, and the service groups with different priorities are mapped into Flexe channels corresponding to corresponding priority identification codes; if the exception occurs, the resource is preempted according to the priority, and the bandwidth adjustment is realized. Based on the method, a bandwidth resource allocation system is also provided. The invention defines the Flexe channel priority identification code, realizes the mapping of the service to the channel according to the priority, and achieves the fine dynamic adjustment of the tunnel bandwidth.
Description
Technical Field
The invention belongs to the technical field of bandwidth resource allocation, and particularly relates to a method and a system for allocating bandwidth resources based on Flexe Channel priority.
Background
The Flexe (flexible Ethernet) technology is that a Flexe Shim layer is introduced on the basis of L2 (MAC)/L1 (PHY) of Ethernet to realize the decoupling of the MAC layer and the PHY layer. The FlexE is a technology capable of realizing hard slice isolation, and a FlexE Channel is based on FlexE time slot exchange, OAM expansion, ultrafast protection switching and the like, and can solve the problem of low bearing efficiency caused by large service granularity. The FlexE (Flexible Ethernet) is based on a high-speed Ethernet interface (100 GE and above interfaces), and realizes Flexible control of interface rate by decoupling of Ethernet MAC rate and PHY rate to adapt to different network transmission structures.
The current FlexE Channel has no priority mechanism, and it is not suitable to perform accurate distinction on the Channel (to realize more accurate bandwidth adjustment). In the process of routing and traffic forwarding, if the FlexE Channel default state cannot meet the transmission requirement, for example, the current Channel bandwidth is not matched with the required bandwidth or the Channel node/FlexE Group is damaged, the protection switching mechanism cannot solve the service degradation problem, and a corresponding policy of the FlexE Channel needs to be applied to the traffic transmission process to provide a proper FlexE Channel. The current bandwidth adjustment strategy is adjusted according to the characteristics of Flexe bounding and the like. However, these strategies do not take into account the priority of the Channel, and therefore the utilization of part of the resources (tunnel load sharing and protection link) for the FlexE Channel is low. This means that there may be risks that some high/low priority traffic has to be dropped, large bandwidth and some high priority fixed traffic (e.g. fine control class traffic) is damaged and lost and QoS (quality of service) requirements are reduced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a bandwidth resource allocation method and a system based on a Flexe Channel priority, and considers the scenes of Channel damage and insufficient Channel bandwidth which may occur in the routing process.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for bandwidth resource allocation based on FlexE Channel priority, the method comprising the steps of:
grouping the acquired service information according to the priority;
constructing a Flexe Channel, and placing a Flexe Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code represents the priority corresponding to the Flexe Channel carrying differentiated services;
if the state of the Flexe Channel is normal, mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding Flexe Channel priority identification codes; and if the Flexe Channel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth.
Further, the process of placing the FlexE Channel priority identifier with priority level into the frame structure is as follows: defining frame head idle bits, and marking a Flexe Channel priority identification code by using protection bits of M bits; and the FlexE Channel priority identification code is a positive integer greater than zero, and the larger the value, the higher the priority level.
Further, the process of mapping the service packets with different priorities into the FlexE channels corresponding to the corresponding FlexE Channel priority identifiers includes: mapping the high-priority service packet to a high-priority Flexe Channel; low priority traffic packets are mapped to low priority FlexE channels.
Further, the method further comprises setting a FlexE Channel priority default value of the protection link to None, and setting a FlexE Channel priority default value of the backup link to None.
Further, if the FlexE Channel state is abnormal, resource preemption is performed according to the FlexE Channel priority corresponding to the FlexE Channel priority identification code, and the process of realizing bandwidth lossless adjustment includes:
under the situation that the bandwidth of a Flexe Channel is insufficient, the high-priority Flexe Channel is borne in the same tunnel, so that the available resources of the low-priority Flexe Channel are allowed to be seized;
and configuring the Flexe Channel priority identification code with the same grade for the protection link under the scene that the original Flexe Channel is damaged.
Further, the process of carrying the high priority FlexE Channel in the same tunnel to allow preemption of the available resources of the low priority FlexE Channel includes: preempting according to the weight under the same priority, wherein the ratio of the weights is according to most surplus proportion;
wherein:
further, the method further comprises the step of increasing the bandwidth of the high-priority FlexE Channel and reducing the bandwidth of the low-priority FlexE Channel in order to avoid packet loss interference on the data being transmitted in the process of preempting the low-priority FlexE Channel by the high-priority FlexE Channel.
Further, the process of increasing the bandwidth of the high-priority FlexE Channel includes: and (4) performing reverse bandwidth adjustment from a sink to a source, preempting a low-priority Flexe Channel to increase the Channel bandwidth, and then increasing the effective bandwidth of the service.
Further, the process of reducing the bandwidth of the bearer low-priority FlexE Channel includes: and (3) performing forward bandwidth adjustment from a source to a destination, releasing the effective bandwidth of the service to a Channel where the high-priority service is located, and reducing the bandwidth of the Channel.
The invention also provides a bandwidth resource allocation system based on the Flexe Channel priority, which comprises an acquisition module, a construction module and an allocation module;
the acquisition module is used for grouping the acquired service information according to the priority;
the building module is used for building a Flexe Channel, and placing a Flexe Channel priority identification code with priority level into a frame structure, wherein the Flexe Channel priority identification code represents the priority corresponding to the Flexe Channel bearing differentiated services;
the distribution module is used for mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding Flexe Channel priority identification codes if the state of the Flexe channels is normal; and if the Flexe Channel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the invention provides a method and a system for allocating bandwidth resources based on Flexe Channel priority, wherein the method comprises the steps of grouping acquired service information according to priority; constructing a Flexe Channel, and placing a Flexe Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code represents the priority corresponding to the Flexe Channel carrying the differentiated service; if the state of the Flexe Channel is normal, mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding Flexe Channel priority identification codes; and if the Flexe Channel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth. Based on a method for allocating bandwidth resources based on Flexe Channel priority, a system for allocating bandwidth resources based on Flexe Channel priority is also provided. The invention considers the scenes of Flexe Channel damage and insufficient Flexe Channel bandwidth which may occur in the routing process, defines the Flexe Channel priority identification code and sets the priority, realizes the priority mapping from the service to the Flexe Channel, and achieves the more fine dynamic adjustment of the tunnel bandwidth.
The invention can make the Channel with bandwidth occupying different FlexeE Channel priority identification codes according to the priority, newly-built nodes or the Channel with damaged FlexeE Group, reduce the possibility of flow loss, realize more reliable flow control and service flow transmission and improve the resource utilization rate of the FlexeE Channel.
The invention considers that the paths can be selected according to a certain weight proportion under the same priority, avoids frequent flow conflict and bandwidth increase and decrease change in a Flexe Channel, and improves the utilization rate and the throughput of the Flexe Channel.
Drawings
Fig. 1 is a flowchart of a method for allocating bandwidth resources based on FlexE Channel priority in embodiment 1 of the present invention;
fig. 2 is a FlexE overhead frame structure with a FlexE Channel priority identifier according to embodiment 1 of the present invention;
fig. 3 is an example of a FlexE Channel mapping mechanism based on priority in embodiment 1 of the present invention;
fig. 4 is a diagram illustrating bandwidth increase adjustment based on FlexE Channel priority in embodiment 1 of the present invention;
fig. 5 is a diagram illustrating a bandwidth reduction adjustment based on FlexE Channel priority in embodiment 1 of the present invention;
fig. 6 is a schematic diagram of a system for allocating bandwidth resources based on FlexE Channel priority in embodiment 2 of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Moreover, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
Example 1
The embodiment 1 of the invention provides a bandwidth resource allocation method based on Flexe Channel Priority, which considers that an end-to-end slice transmission network based on Flexe Channel defines and marks a Flexe Channel Priority ID; wherein the Flexe Channel Priority ID is a Flexe Channel Priority identifier; the Priority levels corresponding to channels under different Priority IDs (Priority identification codes) are specified according to actual requirements, and the divided service groups with different priorities are mapped into Flexe channels of corresponding Priority IDs in order. Considering lossless bandwidth adjustment according to the Channel priority level aiming at the scenes that the Channel bandwidth is insufficient and the path required by the bandwidth cannot be found; considering the processing of low-priority service in a protection link and a new establishment mechanism of the Channel aiming at the Channel damage caused by the damage of a path node or a Flexe Group and the like; and considering the proportional bandwidth occupation aiming at the problem of unbalanced Channel use possibly occurring during the same priority preemption.
Wherein a Channel is a Channel, i.e. a transmission medium of a signal.
The bandwidth resource allocation method disclosed by the invention is based on a Flexe system, and compared with the traditional bandwidth allocation method, the Flexe bandwidth resource allocation is realized by considering a specific Flexe frame mark at a 1.5 layer.
According to the bandwidth resource allocation method based on the Flexe Channel Priority, disclosed by the invention, the reserved field of the Flexe frame structure is subjected to customization processing, level definition and Channel Priority ID labeling are realized on the Flexe Channel, a Priority preemption mechanism under the abnormal condition of the Flexe Channel is realized, and the refined bandwidth dynamic adjustment of a Flexe Channel layer is realized.
Fig. 1 is a flowchart of a method for allocating bandwidth resources based on FlexE Channel priority in embodiment 1 of the present invention;
in step S100, upper layer service information is acquired;
in step S101, grouping the acquired service information according to priority;
in order to avoid that a high-priority frame cannot be transmitted in time due to continuous transmission of a low-priority frame in a queue, and meanwhile, in order to enable services to be transmitted smoothly in an L1 Flexe Channel with priority, priority grouping of the services is achieved in an L2, a plurality of high-priority frames which are allowed to be transmitted in the Flexe Channel and a plurality of low-priority frames which are allowed to be preempted are specified, preparation is made for achieving priority-based service allocation and bandwidth adjustment of subsequent Flexe channels, and important guarantee is provided for QoS requirements of high-priority private network services, such as deterministic bandwidth and low time delay.
In step S102, a FlexE Channel is constructed, and a FlexE Channel priority identification code with a priority level is placed in a frame structure, where the FlexE Channel priority identification code is used to represent a priority corresponding to a FlexE Channel carrying differentiated services;
in the FlexE Channel, data is directly transmitted from an end to a tunnel, and intermediate node equipment can directly adopt physical layer cross forwarding for services. Since this cross-transport mode forms the basis of the L1 layer bearer network, it is considered to add an L1 end-to-end FlexE Channel PRIORITY ID to the FlexE. The FlexE Channel PRIORITY ID is an identifier for characterizing FlexE Channel, and is implemented based on the guard bits of M bits in a FlexE overhead frame, as shown in fig. 2, which is a FlexE overhead frame structure having a FlexE Channel PRIORITY identifier in embodiment 1 of the present invention; for distinguishing different channels carrying differentiated traffic. The Channel PRIORITY ID has a PRIORITY Level (Level), and N levels can be set according to the guard bit size. Only locally valid, and there may be a FlexE Channel of the same PRIORITY ID number in the tunnel. The value is a positive integer greater than 0, and the larger the value, the higher the priority level.
The invention also comprises setting the Default value of the Flexe Channel priority of the protection link to None, and setting the Default value of the Flexe Channel priority of the backup link to None. And the occupation of the Flexe Channel bandwidth of the protection link and the occupation of the Flexe Channel bandwidth of the backup link are not considered during bandwidth adjustment.
In step S103, when a FlexE Channel is normal, mapping service packets with different priorities into the FlexE Channel corresponding to the corresponding FlexE Channel priority identifier, specifically including: mapping the high-priority service packet to a high-priority Flexe Channel; low priority traffic packets are mapped to low priority FlexE channels.
Fig. 3 is an example of a FlexE Channel mapping mechanism based on priority in embodiment 1 of the present invention; for example, in the mapping for the upper layer application, low-latency and high-isolation urrllc service, private network service or video service is mapped into different levels of FlexE channels with high levels, and delay-insensitive and best-effort forwarding emBB service or public network service is mapped into different levels of channels with low levels.
In step S104, it is determined whether the FlexE Channel state is abnormal, and if not, step S106 is executed; if the abnormality occurs, executing step S105;
in step S105, if the FlexE Channel state is abnormal, resource preemption is performed according to the FlexE Channel priority corresponding to the FlexE Channel priority identification code, so as to implement bandwidth lossless adjustment.
Depending on the traffic type and traffic characteristics, different FlexE channels are also allowed to have the same PRIORITY, i.e. different FlexE channels may have the same Channel PRIORITY ID.
In the application, the abnormity of the Flexe Channel state comprises that the bandwidth of a certain Flexe Channel is insufficient or the Channel is damaged.
When the bandwidth of a certain path of FlexE Channel is insufficient, the high-priority FlexE Channel is borne in the same tunnel, so that the available resources of the low-priority FlexE Channel are allowed to be seized, the seizing can be carried out under the same priority according to the weight, and the ratio of the weights is in accordance with the ratio of the Most-weighted values (Most Surplus) so as to meet the requirements of high reliability, low time delay, end-to-end certainty and the like of private network services.
Wherein:
the method reasonably divides the Flexe Channel resources of different PRIORITY IDs in the tunnel, but when the network is confronted with the condition that the services such as congestion, protection switching and the like suddenly increase, the hidden trouble that the bandwidth is not enough still exists in the Flexe Channel carrying the low-delay service, so that the services are queued, waited and even detained. At this time, bandwidth lossless adjustment based on priority needs to be performed in the tunnel to improve the Channel utilization rate.
And the Channel PRIORITY level bearing the high PRIORITY Channel PRIORITY ID in the same tunnel preempts the available resource bearing the low PRIORITY Flexe Channel. The occupation adjusting process cannot generate interferences such as packet loss and the like on data being transmitted, then bandwidth increasing adjustment is carried out on the Flexe Channel with high priority, bandwidth reducing adjustment is carried out on the Flexe Channel with low priority, an adjusting instruction is issued to a source node or a destination node through a control system in the adjusting process, and basic unit overhead information transmitted between adjacent nodes completes negotiation section by section.
When the bandwidth is increased, reverse bandwidth adjustment is carried out from a sink to a source, the low-priority Flexe Channel is preempted to increase the Channel bandwidth, and then the effective bandwidth of the service is increased. Fig. 4 is a diagram illustrating bandwidth increase adjustment based on FlexE Channel priority in embodiment 1 of the present invention; the network manager issues service bandwidth adjustment applications to all nodes on the service path, and the host PE node of the service starts to increase the channel bandwidth to the upstream node hop by hop until the adjustment of the inlet channel bandwidth of the source PE node is finished, and then the effective bandwidth of the service with the corresponding priority is increased. Wherein, rq field represents the request of downstream node to carry out bandwidth adjustment process to upstream node; the Pac field indicates a bandwidth adjustment configuration information signal sent by the upstream node to the downstream node, and indicates that the Channel occupies the bandwidth of the Channel with low priority; the Cc field is a confirmation signal of bandwidth preemption, that is, the upstream node confirms the bandwidth adjustment configuration information; the last Ac field indicates that the bandwidth adjustment is complete.
In contrast to the above situation, when the bandwidth is reduced (bandwidth release), the forward bandwidth adjustment is performed from the source to the sink, the effective bandwidth of the service is released to the Channel where the high-priority service is located, and then the Channel bandwidth is reduced. Fig. 5 shows bandwidth reduction adjustment based on Channel priority in embodiment 1 of the present invention; and the network manager sends service bandwidth adjustment information to all nodes on the service path, and adjusts the effective bandwidth of the service hop by hop (return) until the effective bandwidth of the outlet service of the host PE node is adjusted, so that the reduction of the channel bandwidth is realized.
Under the original Flexe Channel damage scene, the Flexe protection link allows the transmission of low-priority services in a non-working state. However, when a PE intermediate node is damaged or a certain FlexE Group is damaged, it may cause a failure of the transmission chain of the FlexE Channel. The existing protection switching mechanism can only switch the customer service on the failed Channel to another one according to 1+1 protection or 1: the Channel level of the low priority service in the protection/backup Channel cannot be degraded when the Channel with 1 protection is transmitted, and the Channel with a certain priority cannot be provided for the transmission of the low priority service. We can now consider the adjustment of resources based on the Channel priority.
When such a scene that the original FlexE Channel is damaged occurs, the Channel PRIORITY ID of the original FlexE Channel can be given to the backup link, the protection link is used as a main path, and meanwhile, the low-PRIORITY Channel replacement is realized for the low-PRIORITY service in the protection link.
Lossless adjustment of bandwidth of multiple channels at the same level: there may be FlexE channels of the same priority in the tunnel. When channels at the same level are preempted, the preemption is considered according to the weights, the ratio of the weights is in proportion to the Most-Surplus value, partial preemption is realized for each Channel according to the ratio, the low-delay service transmission requirement is met, and the network link resource is effectively utilized to the maximum extent.
For example: the tunnel has two FlexE channels of two identical priorities (assuming Channel PRIORITY ID = 6), which are Channel 6 (a) and Channel 6 (B), respectively, and Most-Surplus (a): most-Surplus (B) =4:6. if the Channel bandwidth size currently required to occupy priority level 6 is 100GE, 40GE of Channel 6 (a) and 60GE of Channel 6 (B) will be occupied during bandwidth adjustment.
In step S106, deterministic transmission is performed, and the process of deterministic transmission is: mapping the service packet with high priority to the Channel with high priority; principle of low priority traffic packets mapping to low priority channels.
In the bandwidth resource allocation method based on the FlexE Channel priority provided in embodiment 1 of the present invention, a scene that Channel damage and Channel bandwidth are insufficient, which may occur in a routing process, is considered, a FlexE Channel priority identifier is defined and a priority is set, and mapping from a service to a Channel according to the priority is implemented, so as to achieve relatively fine dynamic adjustment of a Channel bandwidth.
In the bandwidth resource allocation method based on the FlexE Channel priority proposed in embodiment 1 of the present invention, a Channel, a newly-built node, or a Channel with a damaged FlexE Group, where an existing bandwidth occupies different FlexE Channel priority identification codes according to priorities, so as to reduce the possibility of flow loss, implement more reliable flow control and service flow transmission, and improve the resource utilization rate of the FlexE Channel.
In the bandwidth resource allocation method based on the FlexE Channel priority, which is provided in embodiment 1 of the present invention, it is considered that a path can be selected according to a certain weight ratio under the same priority, thereby avoiding frequent flow collision and bandwidth increase and decrease changes in one Channel, and improving Channel utilization and throughput.
Example 2
Based on a bandwidth resource allocation method based on a FlexE Channel priority proposed in embodiment 1 of the present invention, embodiment 2 of the present invention proposes a bandwidth resource allocation system based on a FlexE Channel priority, as shown in fig. 6, which is a schematic diagram of a bandwidth resource allocation system based on a FlexE Channel priority in embodiment 2 of the present invention, the system includes an acquisition module, a construction module and an allocation module;
the acquisition module is used for grouping the acquired service information according to the priority;
the construction module is used for constructing a Flexe Channel, and placing a Flexe Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code is used for representing the priority corresponding to the Flexe Channel bearing the differentiated service;
the distribution module is used for mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding Flexe Channel priority identification codes if the state of the Flexe channels is normal; and if the Flexe Channel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth.
The process realized by the acquisition module comprises the following steps: in order to avoid that a high-priority frame cannot be transmitted in time due to continuous transmission of a low-priority frame in a queue, and meanwhile, in order to enable services to be transmitted stably in an L1 Channel with priority, priority grouping of the services is achieved in an L2, a plurality of high-priority frames which are allowed to be transmitted in a Flexe Channel and a plurality of low-priority frames which are allowed to be preempted are specified, preparation is made for achieving priority-based service allocation and bandwidth adjustment of subsequent Flexe channels, and important guarantee is provided for QoS requirements of high-priority private network services, such as deterministic bandwidth and low time delay.
The process of building module implementation comprises the following steps: in the FlexE Channel, data is directly transmitted from an end to a tunnel, and intermediate node equipment can directly adopt physical layer cross forwarding for services. Since this cross-transport mode forms the basis of the L1 layer bearer network, it is considered to add an L1 end-to-end FlexE Channel PRIORITY ID to the FlexE. The FlexE Channel PRIORITY ID is an identifier for characterizing FlexE Channel, and is implemented based on the guard bits of M bits in a FlexE overhead frame, as shown in fig. 2, which is a FlexE overhead frame structure having a FlexE Channel PRIORITY identifier in embodiment 1 of the present invention; for distinguishing different channels carrying differentiated traffic. Channel PRIORITY ID has a PRIORITY Level (Level), N levels can be set according to the guard bit size, only locally valid, and a FlexE Channel of the same PRIORITY ID number can exist in the tunnel. The value is a positive integer greater than 0, the larger the value, the higher the priority level.
The invention also comprises setting the Default value of the Flexe Channel priority of the protection link to None, and setting the Default value of the Flexe Channel priority of the backup link to None. And the occupation of the Flexe Channel bandwidth of the protection link and the occupation of the Flexe Channel bandwidth of the backup link are not considered during bandwidth adjustment.
The process realized by the distribution module comprises the following steps: depending on the traffic type and traffic characteristics, different FlexE channels are also allowed to have the same PRIORITY, i.e. different FlexE channels may have the same Channel PRIORITY ID.
In the application, the abnormity of the Flexe Channel state comprises that the bandwidth of a certain Flexe Channel is insufficient or the Channel is damaged.
When the bandwidth of a certain path of FlexE Channel is insufficient, the high-priority FlexE Channel is borne in the same tunnel, so that the available resources of the low-priority FlexE Channel are allowed to be seized, the seizing can be carried out under the same priority according to the weight, and the ratio of the weights is in accordance with the ratio of the Most-weighted values (Most Surplus) so as to meet the requirements of high reliability, low time delay, end-to-end certainty and the like of private network services.
Wherein:
the method reasonably divides the Flexe Channel resources of different PRIORITY IDs in the tunnel, but when the network is faced with the condition that the services such as congestion and protection switching suddenly increase, the hidden trouble of insufficient bandwidth still exists in the Flexe Channel carrying the low-delay service, so that the services are queued, waited and even detained. At this time, bandwidth lossless adjustment based on priority needs to be performed in the tunnel to improve the Channel utilization rate.
And the Channel PRIORITY level bearing the high PRIORITY Channel PRIORITY ID in the same tunnel preempts the available resource bearing the low PRIORITY Flexe Channel. The occupation adjusting process cannot generate interferences such as packet loss and the like on data being transmitted, then bandwidth increasing adjustment is carried out on the Flexe Channel with high priority, bandwidth reducing adjustment is carried out on the Flexe Channel with low priority, an adjusting instruction is issued to a source node or a destination node through a control system in the adjusting process, and basic unit overhead information transmitted between adjacent nodes completes negotiation section by section.
When the bandwidth is increased, reverse bandwidth adjustment is carried out from a sink to a source, the low-priority Flexe Channel is preempted to increase the Channel bandwidth, and then the effective bandwidth of the service is increased. Fig. 4 is a diagram illustrating bandwidth increase adjustment based on FlexE Channel priority in embodiment 1 of the present invention; the network manager issues service bandwidth adjustment applications to all nodes on the service path, and the host PE node of the service starts to increase the channel bandwidth to the upstream node hop by hop until the adjustment of the inlet channel bandwidth of the source PE node is finished, and then the effective bandwidth of the service with the corresponding priority is increased. Wherein, the Rq field represents the request of the downstream node to perform the bandwidth adjustment process to the upstream node; the Pac field represents a bandwidth adjustment configuration information signal sent by an upstream node to a downstream node, and indicates that the Channel occupies the bandwidth of the Channel with low priority; the Cc field is a confirmation signal of bandwidth preemption, that is, the upstream node confirms the bandwidth adjustment configuration information; the last Ac field indicates that the bandwidth adjustment is complete.
In contrast to the above situation, when the bandwidth is reduced (bandwidth release), the forward bandwidth adjustment is performed from the source to the sink, the effective bandwidth of the service is released to the Channel where the high-priority service is located, and then the Channel bandwidth is reduced. Fig. 5 is a diagram illustrating bandwidth reduction adjustment based on Channel priority in embodiment 1 of the present invention; and the network manager sends service bandwidth adjustment information to all nodes on the service path, and adjusts the effective bandwidth of the service hop by hop (return) until the effective bandwidth of the outlet service of the host PE node is adjusted, so that the reduction of the channel bandwidth is realized.
Under the original Flexe Channel damage scene, the Flexe protection link allows the transmission of low-priority services in a non-working state. However, when a PE intermediate node is damaged or a certain FlexE Group is damaged, it may cause a failure of the transmission chain of the FlexE Channel. The existing protection switching mechanism can only switch the customer service on the failed Channel to another one according to 1+1 protection or 1: the Channel level of the low priority service in the protection/backup Channel cannot be degraded when the Channel with 1 protection is transmitted, and the Channel with a certain priority cannot be provided for the transmission of the low priority service. We can now consider the adjustment of resources based on the Channel priority.
When such a scene that the original FlexE Channel is damaged occurs, the Channel PRIORITY ID of the original FlexE Channel can be given to the backup link, the protection link is used as a main path, and meanwhile, the low-PRIORITY Channel replacement is realized for the low-PRIORITY service in the protection link.
And (3) bandwidth lossless adjustment of multiple channels at the same level: there may be FlexE channels of the same priority in the tunnel. When channels at the same level are preempted, the preemption is considered according to the weights, the ratio of the weights is in proportion to the Most-Surplus value, partial preemption is realized for each Channel according to the ratio, the low-delay service transmission requirement is met, and the network link resource is effectively utilized to the maximum extent.
For example: the tunnel has two FlexE channels of the same PRIORITY (assuming Channel PRIORITY ID = 6), which are Channel 6 (a) and Channel 6 (B), respectively, and Most-priorities (a): most-Surplus (B) =4:6. if the Channel bandwidth size needing to occupy priority level 6 currently is 100GE, 40GE of Channel 6 (a) and 60GE of Channel 6 (B) will be occupied during bandwidth adjustment 。
And performing deterministic transmission, wherein the deterministic transmission process comprises the following steps: mapping the service packet with high priority to the Channel with high priority; principle of low priority traffic packets mapping to low priority channels.
In a bandwidth resource allocation system based on a FlexE Channel priority, which is provided in embodiment 2 of the present invention, a FlexE Channel priority identifier is defined and a priority is set in consideration of a scenario that FlexE Channel damage and FlexE Channel bandwidth insufficiency may occur in a routing process, so that mapping from a service to a FlexE Channel according to the priority is implemented, and a relatively fine dynamic adjustment of a tunnel bandwidth is achieved.
In the bandwidth resource allocation system based on the FlexE Channel priority proposed in embodiment 2 of the present invention, a Channel, a newly-built node, or a Channel damaged by a FlexE Group, where an existing bandwidth occupies different FlexE Channel priority identification codes according to priorities, so as to reduce the possibility of flow loss, implement more reliable flow control and service flow transmission, and improve the resource utilization rate of the FlexE Channel.
In the bandwidth resource allocation system based on the FlexE Channel priority, which is provided in embodiment 2 of the present invention, it is considered that a path can be selected according to a certain weight ratio under the same priority, thereby avoiding frequent flow collision and bandwidth increase and decrease changes in one FlexE Channel, and improving the FlexE Channel utilization and throughput.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto. Various modifications and alterations will occur to those skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. On the basis of the technical scheme of the invention, various modifications or changes which can be made by a person skilled in the art without creative efforts are still within the protection scope of the invention.
Claims (10)
1. A method for allocating bandwidth resources based on Flexe Channel priority, the method comprising the steps of:
grouping the acquired service information according to the priority;
constructing a Flexe Channel, and placing a Flexe Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code represents the priority corresponding to the Flexe Channel carrying differentiated services;
if the Flexe Channel state is normal, mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding FlexeChannel priority identification codes; and if the Flexe Channel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth.
2. The method for allocating bandwidth resources based on the FlexE Channel priority as claimed in claim 1, wherein the process of placing the FlexE Channel priority identifier with priority class into the frame structure is: defining frame head idle bits, and labeling a Flexe Channel priority identification code by using protection bits of M bits; and the FlexE Channel priority identification code is a positive integer greater than zero, and the larger the value, the higher the priority level.
3. The method for allocating bandwidth resources based on the FlexE Channel priority as claimed in claim 1, wherein the process of mapping the service packets with different priorities into the FlexE channels corresponding to the corresponding FlexE Channel priority identifiers comprises: mapping the high-priority service packet to a high-priority Flexe Channel; low priority traffic packets are mapped to low priority FlexEChannel.
4. The method for allocating the bandwidth resources based on the Flexe Channel priority as claimed in claim 3, wherein the method further comprises setting the Default Flexe Channel priority of the protection link to None and the Default Flexe Channel priority of the backup link to None.
5. The method for allocating bandwidth resources based on the Flexe Channel priority as claimed in claim 1, wherein if the Flexe Channel state is abnormal, the resource preemption is performed according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and the process of implementing the bandwidth lossless adjustment includes:
under the condition that the bandwidth of a Flexe Channel is insufficient, carrying a high-priority FlexeChannel in the same tunnel to allow the occupation of available resources of a low-priority Flexe Channel;
and under the scene that the original Flexe Channel is damaged, configuring FlexeChannel priority identification codes with the same level for the protection link.
6. The method for allocating bandwidth resources based on Flexe Channel priority as claimed in claim 5, wherein the process of carrying the high priority Flexe Channel in the same tunnel to allow the preemption of the available resources of the low priority Flexe Channel comprises: preempting according to the weight under the same priority, wherein the ratio of the weights is according to most surplus proportion;
wherein:
7. the method according to claim 6, further comprising increasing the bandwidth of the FlexE Channel with high priority and decreasing the bandwidth of the FlexE Channel with low priority to avoid packet loss interference on the data being transmitted during the process of preempting the FlexE Channel with low priority.
8. The FlexE Channel priority-based bandwidth resource allocation method according to claim 7, wherein the process of increasing the bearer high priority FlexE Channel bandwidth includes: and (4) performing reverse bandwidth adjustment from a sink to a source, preempting a low-priority Flexe Channel to increase the Channel bandwidth, and then increasing the effective bandwidth of the service.
9. The FlexE Channel priority-based bandwidth resource allocation method according to claim 7, wherein the process of reducing bearer low priority FlexE Channel bandwidth comprises: and (3) performing forward bandwidth adjustment from a source to a destination, releasing the effective bandwidth of the service to a Channel where the high-priority service is located, and reducing the bandwidth of the Channel.
10. A bandwidth resource allocation system based on Flexe Channel priority is characterized by comprising an acquisition module, a construction module and an allocation module;
the acquisition module is used for grouping the acquired service information according to the priority;
the building module is used for building a Flexe Channel, and placing a FlexeC Channel priority identification code with a priority level into a frame structure, wherein the Flexe Channel priority identification code is used for representing the priority corresponding to the Flexe Channel carrying differentiated services;
the distribution module is used for mapping the service groups with different priorities to the Flexe channels corresponding to the corresponding Flexe Channel priority identification codes if the state of the Flexe channels is normal; and if the FlexeChannel state is abnormal, carrying out resource preemption according to the Flexe Channel priority corresponding to the Flexe Channel priority identification code, and realizing the lossless adjustment of the bandwidth.
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