WO2022111724A1 - 网络拥塞检测方法及装置 - Google Patents

网络拥塞检测方法及装置 Download PDF

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WO2022111724A1
WO2022111724A1 PCT/CN2021/134299 CN2021134299W WO2022111724A1 WO 2022111724 A1 WO2022111724 A1 WO 2022111724A1 CN 2021134299 W CN2021134299 W CN 2021134299W WO 2022111724 A1 WO2022111724 A1 WO 2022111724A1
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vlan tag
congestion
node
identification information
field
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PCT/CN2021/134299
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English (en)
French (fr)
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王俊杰
成伟
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苏州盛科通信股份有限公司
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Publication of WO2022111724A1 publication Critical patent/WO2022111724A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876—Network utilisation, e.g. volume of load or congestion level
    • H04L43/0882—Utilisation of link capacity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/11—Identifying congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/18—End to end

Definitions

  • the present invention relates to a network congestion detection technology, in particular to a network congestion detection method and device.
  • Network congestion means that when the bandwidth for forwarding data packets in the network exceeds the port forwarding capability, the data packet forwarding delay increases due to the limited queue buffer resources of the network switch. In severe cases, packet loss and retransmission occur, resulting in service interruption. .
  • control server With the rise of high-performance computing, the control server will split the entire computing task into multiple subtasks, assign them to multiple servers for calculation, and return the calculation results to the control server, resulting in multiple ports for data center network traffic sent to a port, thereby significantly increasing the occurrence of network congestion.
  • Traditional network switches mainly rely on the ECN (Explicit Congestion Notification) mechanism for congestion detection and perception technology.
  • the IP Internet Protocol, Internet Protocol
  • the ECN congestion detection mechanism by marking the 2 bits (bits) of the ECN of the data flow message It is all 1 to carry the network congestion information in the data packet until the receiving end, and the receiving end adjusts the rate of the transmitting end according to the frequency of receiving the ECN packets marked with congestion.
  • the DSCP Differentiated Services Code Point, Label Protocol Identifier
  • the DSCP Differentiated Services Code Point, Label Protocol Identifier
  • ECT ECN Capable Transport
  • CE Congestion Experienced
  • WRED Weighted Random Early Detection, weighted random round-robin
  • ECN IP packet marked with ECN
  • the receiving server receives a packet with an ECN of 11 and sends a congestion notification packet, and processes the packet normally
  • the receiving end generates a congestion notification and periodically sends the protocol packet
  • the switch forwards the packet normally after receiving the protocol packet
  • the sending server After receiving the protocol packet, execute the corresponding data flow rate limiting algorithm to adjust the rate of the sender.
  • the above-mentioned detection of congestion through ECN mainly has the following two problems.
  • One is that the ECN field of the data flow message has only 2 bits, which cannot describe the fine-grained congestion degree;
  • the terminal judges that the network is congested it is only whether the situation is present or not, and it cannot accurately determine which of the forwarding switches along the route are congested. Therefore, the existing solutions for detecting network congestion based on the ECN mechanism cannot achieve fine-grained network congestion detection and hop-by-hop network congestion detection.
  • the purpose of the embodiments of the present invention is to overcome the defects of the prior art, and to provide a network congestion detection method and device.
  • a network congestion detection method comprising:
  • the sending end sends a data packet to the forwarding head node, enables network congestion detection at the head node, and inserts the congestion identification information of the head node into the data packet, and carries it to the next node with the data packet;
  • the intermediate nodes and the tail nodes except the head node at least some nodes insert their own congestion identification information into the data message hop by hop;
  • the tail node sends the data message carrying the congestion identification information to the receiving end, and the receiving end feeds back all the congestion identification information back to the transmitting end;
  • the sending end adjusts corresponding parameters of the data packet according to the feedback congestion identification information, where the parameters include a sending rate.
  • the congestion identification information is carried by a virtual local area network label.
  • the first node is inserted into the first VLAN (Virtual Local Area Network, virtual local area network) label and the second VLAN label, the first VLAN label is used to identify whether to enable network congestion detection, the second VLAN label It is used to carry the congestion identification information, and the inserted first VLAN tag and second VLAN tag are carried to the next node along with the data message.
  • VLAN Virtual Local Area Network, virtual local area network
  • the intermediate node or the tail node judges whether to continue inserting the second VLAN tag according to the first VLAN tag, and if so, continues to insert the second VLAN tag carrying its own congestion identification information into the data packet.
  • the field in the described first VLAN tag includes at least Init ID (Initialization Identity Document, initialization identification number), Hop (hop) field and Flow ID (flow identification) field, and the Init ID is a VLAN extended from Define a numerical value, the Hop field represents the inserted VLAN tag quantity, and the Hop field adds 1 hop by hop when the data message is forwarded; the Flow ID field is used to identify the data message that enables network congestion detection.
  • Init ID Initialization Identity Document, initialization identification number
  • Hop Hop
  • Flow ID flow identification
  • the second VLAN tag includes at least a forwarding delay field and a queue depth field, and the forwarding delay field and the queue depth field are used to respectively identify the forwarding delay and the queue depth of the data packet.
  • the second VLAN tag also includes a BW field and a B field
  • the BW field is used to indicate the bandwidth of the outgoing port
  • the B field is used to identify whether the added second VLAN tag is the last VLAN tag.
  • the B field is set according to the Hop field in the first VLAN tag, and when the second VLAN tag added by the B field identification is the last VLAN tag, the next node will not insert the second VLAN tag.
  • the process of inserting the congestion identification information by the first node includes:
  • the head node processes the data packet to obtain first packet information required for editing the congestion information, where the first packet information at least includes Flow ID, forwarding delay, and queue depth;
  • the process of inserting the congestion identification information by the intermediate node or the tail node includes:
  • the intermediate node or the tail node processes the data packet to obtain second packet information required for editing the congestion information, where the second packet information at least includes forwarding delay, queue depth and information in the first VLAN tag ;
  • S202 Insert the second VLAN tag at the intermediate node or the tail node according to the second packet information, and update the information in the first VLAN tag.
  • a network congestion detection device the device includes:
  • the sending end is used to send the data message to the forwarding head node, and adjust the corresponding parameters of the data message according to the congestion identification information fed back by the receiving end, and the parameters include the sending rate;
  • the head node used for enabling network congestion detection, and inserting the congestion identification information of the head node into the data message, and carrying it to the next node with the data message;
  • the intermediate node and the tail node at least some of the nodes are used to insert their own congestion identification information into the data message hop by hop, and the tail node sends the data message carrying the congestion identification information to the receiving end;
  • the receiver is used to feed back all the congestion identification information to the sender.
  • the beneficial effects of the embodiments of the present invention are: in the embodiments of the present invention, the forwarding delay, queue depth and other information of the data packets of the switching chip are used as the congestion identification information, and the VLAN extension fields are used to carry the congestion identification information.
  • the VLAN extension field is added to the hop to carry the network congestion identification information, so as to meet the hop-by-hop network congestion detection from the sender to the receiver, realize fine-grained network congestion detection, and realize hop-by-hop network congestion detection.
  • Fig. 1 is the schematic diagram of the message format of the existing IP message header
  • FIG. 2 is a schematic flowchart of a method for detecting network congestion according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of the principle of a network congestion detection apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the format of a two-layer VLAN tag according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a processing flow of a data packet by a forwarding node according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a processing flow of a data packet by a head node according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a processing flow of a data packet by an intermediate node or a tail node according to an embodiment of the present invention.
  • the network congestion detection method and device disclosed in the embodiments of the present invention solve the problems that the existing ECN mechanism-based network congestion detection cannot achieve fine granularity detection and hop-by-hop network congestion detection.
  • a network congestion detection method disclosed in an embodiment of the present invention includes the following steps:
  • the sending end sends the data packet to the forwarding head node, enables network congestion detection at the head node, and inserts the congestion identification information of the head node into the data packet, and carries it to the next node with the data packet.
  • the process of inserting the congestion identification information by the head node includes:
  • the first node receives the data packet, first performs packet parsing processing, and obtains packet information in its parsing module, the packet information includes a destination MAC (Media Access Control, media access control) address (MACDA), a source MAC address ( MACSA), destination IP address (IPDA), source IP address (IPSA), Layer 3 protocol type (L3 Protocol Type), L4 source port number, L4 destination port number, etc.
  • MACDA Media Access Control, media access control
  • MACSA source MAC address
  • IPDA destination IP address
  • IPSA source IP address
  • L3 Protocol Type Layer 3 protocol type
  • L4 source port number L4 destination port number, etc.
  • the chip in the inbound direction delay marking module of the head node, the chip will record the inbound direction forwarding delay of the data packet according to the above Flow ID, and carry it to the subsequent processing flow for calculating the data packet in the chip Overall forwarding delay.
  • the chip in the queue scheduling module of the head node, the chip will perform a queue depth detection function, record the current depth of the queue where the data packet is located, convert it into a percentage of the queue buffer occupancy, and carry the queue depth information to the subsequent processing flow.
  • the chip in the outbound delay marking module of the head node, the chip records the outbound forwarding delay of the data packet according to the Flow ID, and calculates the data packet by subtracting the inbound forwarding delay from the outbound forwarding delay The overall forwarding delay of the chip is used, and the forwarding delay of the data packet is used to edit the packet congestion information.
  • the packet editing module of the head node will perform editing of network congestion information. For example, according to the information such as the forwarding delay, queue depth, and bandwidth of the outgoing port of the data packet obtained in the above steps, two layers of extended VLAN tags are inserted into the data packet.
  • the first layer is the first layer VLAN tag, which is the boot VLAN tag, used to identify whether to enable network congestion detection.
  • the embodiment of the present invention considers that when the actual network is deployed, the nodes along the way need to enable the network congestion detection function, so the embodiment of the present invention adopts VLAN Tag (Virtual Local Area Network Label) to carry the network congestion identification information.
  • VLAN Tag Virtual Local Area Network Label
  • the embodiment of the present invention fully considers the difficulty of supporting the chip design as much as possible, and at the same time, in order to reduce the overhead ratio of the packet serial number, on the basis of the standard VLAN definition, the existing chip capabilities are fully utilized, and the VLAN is extended to the minimum extent.
  • the chip has the capability of hop-by-hop network congestion detection.
  • the fields in the first VLAN tag at least include reserved Init ID, Hop field and Flow ID field, wherein, Init ID is a VLAN extended self-defined value, which is used to reserve a specific value to identify the datagram Whether the congestion detection function is enabled in the document, the subsequent intermediate nodes or tail nodes judge whether to insert a VLAN tag according to the Init ID.
  • the Hop field indicates the number of inserted VLAN tags. In the head node, the initial value of the Hop field can be set to 1. In this embodiment, the maximum number of VLAN tags inserted does not exceed 8, that is, the maximum value of the Hop field is 8. The number is limited to 8, which can be set according to the actual situation.
  • the Hop field in the first VLAN tag is incremented by 1.
  • the Flow ID field has been generated in the inbound forwarding processing module in the above step S102.
  • the second layer VLAN tag is used to carry the congestion identification information, including the forwarding delay (Latency) field, the BW field, the B field, and the queue depth (QLen) field.
  • the forwarding delay information of the whole (ie, from the ingress port to the egress port) of the above-mentioned data packet in the head node is carried.
  • the length of the Latency field is 16 bits
  • the default unit is 512ns
  • the default delay measurement unit can be flexibly configured, such as 256ns or 1us.
  • the BW field is used to indicate the bandwidth of the outgoing port, with a length of 3 bits, that is, it can distinguish the port bandwidth of 8 different rates at the maximum, respectively supporting 1G, 10G, 25G, 40G, 100G, 200G, 400G, 800G, of course, it is limited to 3 bits, which can be configured as needed.
  • the B field is used to identify whether the added second VLAN tag is the last VLAN tag, and has a length of 1 bit. In the initial state, the B field is 0. When the B field is 1, it indicates that the VLAN is the innermost VLAN, that is, the last VLAN tag is added, and the next node does not insert the second VLAN tag.
  • the B field is set according to the Hop field in the first VLAN tag.
  • the B field is set to 1.
  • the queue depth field is used to identify the current queue depth of the data packet, which is the proportion of the queue depth.
  • the length of the queue depth field is 12 bits, and the smallest granularity is 1/4096.
  • the forwarding delay and queue depth of data packets are used as indicator information for detecting whether network congestion occurs and the severity of the congestion.
  • the congestion identification information can be set according to actual needs, and is not limited here.
  • the added message information is used.
  • the lengths of the first VLAN tag and the second VLAN tag are the same, and two kinds of VLAN tags are set in this embodiment of the present invention, which can simplify the implementation complexity of the packet loss detection mechanism.
  • the packet After the packet is edited, it is forwarded from the outgoing port of the head node to the next-hop network device (ie, the intermediate node or the tail node).
  • the next-hop network device ie, the intermediate node or the tail node.
  • At least some of the intermediate nodes and tail nodes except the head node insert their own congestion identification information into the data packet hop by hop.
  • the process of inserting the congestion identification information by the intermediate node or the tail node includes:
  • the intermediate node or the tail node receives the data packet, and also performs packet parsing processing first, and obtains packet information in its parsing module.
  • the packet information includes the destination MAC address (MACDA), the source MAC address (MACSA), and the destination IP address. address (IPDA), source IP address (IPSA), multiple layers of VLAN tags (ie, one layer of the above-mentioned first VLAN tag and at least one layer of the above-mentioned second VLAN tag) and the like. Therefore, for the intermediate node or tail node chip, it is necessary to increase the parsing process of the custom VLAN tag (VLAN Tag), and logically identify the Init ID field, the Hop field, the Flow ID field, etc. in the custom first VLAN tag, and The packet information obtained by parsing is carried into the subsequent processing flow.
  • VLAN Tag custom VLAN tag
  • the packet information obtained by parsing is carried into the subsequent processing flow.
  • the chip in the inbound direction delay marking module of the intermediate node or the tail node, the chip will record the inbound direction forwarding delay of the data packet according to the above Flow ID, and carry it to the subsequent processing flow for calculating the data packet.
  • the overall forwarding delay of the chip is the chip.
  • the chip will perform the queue depth detection function, record the current depth of the queue where the data packet is located, convert it into a percentage of the queue buffer occupancy, and carry the queue depth information to subsequent Process flow.
  • the chip in the outbound delay marking module of the intermediate node or the tail node, the chip records the outbound forwarding delay of the data packet according to the Flow ID, and calculates the outbound forwarding delay by subtracting the inbound forwarding delay from the outbound forwarding delay.
  • the overall forwarding delay of data packets on the chip is used to edit the packet congestion information.
  • the packet editing module of the intermediate node or the tail node will perform editing of the network congestion information.
  • the information such as the forwarding delay, the queue depth, and the bandwidth of the outgoing port of the data packet obtained in the above steps, insert a second-layer extended VLAN tag, that is, the second VLAN tag, into the data packet.
  • the second VLAN tag includes The fields and the definitions and lengths of the fields are the same as those described above, and will not be repeated here, except that in each node, the information carried in the second VLAN tag is the packet information of the current node (including forwarding delay, queue depth, etc.). , outgoing port bandwidth, etc.).
  • the network device of this hop is the last hop along the forwarding path, you also need to edit the B field in the second VLAN tag to 1. Finally, the Hop field in the first VLAN tag is updated, and each time a congestion detection extended VLAN tag is inserted, the Hop field needs to be correspondingly increased by one.
  • the packet After the packet is edited, it is forwarded from the egress port of the intermediate node or the tail node to the next-hop network device (ie, the intermediate node or the tail node of the next hop or the receiver).
  • the next-hop network device ie, the intermediate node or the tail node of the next hop or the receiver.
  • the tail node sends the data packet carrying the congestion identification information to the receiving end, and the receiving end feeds back all the congestion identification information back to the transmitting end.
  • the sending end adjusts corresponding parameters of the data packet according to the feedback congestion identification information, where the parameters include a sending rate.
  • a network congestion detection apparatus disclosed in an embodiment of the present invention includes:
  • the sending end is configured to send the data packet to the forwarding head node, and adjust corresponding parameters of the data packet according to the congestion identification information fed back by the receiving end, where the parameters include the sending rate.
  • the head node is used for enabling network congestion detection, and inserting the congestion identification information of the head node into the data packet, and carrying it to the next node along with the data packet.
  • the intermediate node and the tail node at least some of the nodes are used to insert their own congestion identification information into the data packet hop by hop, and the tail node sends the data packet carrying the congestion identification information to the receiving end.
  • the receiver is used to feed back all the congestion identification information to the sender.
  • the information such as the forwarding delay of the packet inside the chip, the queue depth inside the chip, etc., are used as the network congestion identification information through the chip sensing technology, and the congestion identification information is transmitted along with the VLAN expansion technology by using the VLAN extension technology.
  • Data packets are carried hop-by-hop to the receiving end, enabling end-to-end network congestion detection with fine granularity and hop-by-hop network congestion detection.

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Abstract

本发明揭示了一种网络拥塞检测方法及装置，所述方法包括首节点使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文；中间节点和尾节点中的至少部分节点逐跳在数据报文中插入自身的拥塞标识信息；数据报文的接收端将所有的拥塞标识信息反馈回发送端；发送端根据反馈的拥塞标识信息，调整数据报文的发送速率。本发明通过逐跳增加VLAN扩展字段来携带网络拥塞标识信息，从而提高网络拥塞检测的精细粒度以及实现逐跳的网络拥塞检测。

Description

网络拥塞检测方法及装置
本发明要求于2020年11月30日提交中国专利局、申请号为202011376930.9、发明名称“一种网络拥塞检测方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本发明中。
技术领域
本发明涉及一种网络拥塞检测技术，尤其是涉及一种网络拥塞检测方法及装置。
背景技术
网络拥塞是指在网络中转发数据包的带宽超出端口转发能力时，由于网络交换机的队列缓存资源有限而造成数据报文转发时延增大，严重时甚至发生丢包重传，使得业务发生中断。
随着高性能计算的兴起，控制服务器会将整个计算任务拆分成多个子任务，分配到多个服务器进行计算，并将计算结果返回到控制服务器，导致数据中心网络流量出现多个端口发往一个端口，从而显著增大的网络拥塞的发生。传统网络交换机对于拥塞的检测和感知技术，主要依靠的是ECN(Explicit Congestion Notification，显示拥塞通告)机制。具体地，当网络交换机队列发生拥塞时，如果该IP(Internet Protocol，网络互连协议)数据流使能ECN拥塞检测机制，通过将数据流报文的ECN的2个bit(比特)位都标记为全1，以将该网络拥塞信息携带在数据报文中，一直到接收端，接收端根据被拥塞标记ECN报文的接收频率来调整发送端的速率。
如图1所示，IP报文头部中的DSCP(Differentiated Services Code Point，标签协议标识符)字段有2比特位用于标识ECN。这2个比特位分别表示：ECT(ECN Capable Transport)和CE(Congestion Experienced)。其 中，当ECT为0，CE为0时，表示IP报文不支持ECN；当ECT为0，CE为1时，表示IP报文支持ECN；当ECT为1，CE为0时，表示IP报文支持ECN；当ECT为1，CE为1时，表示IP报文支持ECN且发生拥塞。
ECN是报文在网络设备出口发生拥塞时，将使能ECN(当IP报文的ECN字段为01或10，表示使能ECN)的IP报文头部的ECN字段标记ECN＝11，表示该IP报文遇到网络拥塞，且该IP报文不会被WRED(Weighted Random Early Detection，加权随机轮循)机制丢弃。如果接收服务器发现IP报文的ECN字段被标记成11，就立刻产生拥塞通知报文，并将该报文发送给源服务器，拥塞通知消息里包含了拥塞的数据流信息，远端服务器接收到后，通过降低相应的数据流发送速率，缓解网络设备拥塞，从而避免发生丢包。
如图2所示，ECN的交互过程描述为：发送端发送IP报文标记ECN(ECN＝10)，交换机在队列拥塞的情况下收到该报文，将ECN字段修改为11并转发出去；接收服务器收到ECN为11的报文发送拥塞通知报文，并正常处理该报文；接收端产生拥塞通告，周期发送协议报文；交换机收到协议报文后正常转发该报文；发送服务器收到协议报文，执行相应的数据流限速算法，调整发送端的速率。
但是，上述通过ECN来检测拥塞，主要存在以下两个问题，一是数据流报文的ECN字段只有2个比特位，无法描述精细粒度的拥塞程度；二是当报文被标记ECN后，接收端判断网络发生拥塞只局面在有无，而无法精确到沿途转发的交换机中哪几台发生了拥塞。所以，现有基于ECN机制对网络拥塞进行检测的方案，无法实现精细粒度的网络拥塞的检测，以及无法实现逐跳的网络拥塞检测。
发明内容
本发明实施例的目的在于克服现有技术的缺陷，提供一种网络拥塞检 测方法及装置。
为实现上述目的，本发明实施例提出如下技术方案：一种网络拥塞检测方法，包括：
S100，发送端发送数据报文给转发的首节点，在所述首节点使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点；
S200，除首节点外的中间节点和尾节点，至少部分节点逐跳在数据报文中插入自身的拥塞标识信息；
S300，所述尾节点将携带有拥塞标识信息的数据报文发送给接收端，所述接收端将所有的拥塞标识信息反馈回发送端；
S400，所述发送端根据反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率。
可选地，所述拥塞标识信息通过虚拟局域网标签携带。
可选地，所述首节点插入第一VLAN(Virtual Local Area Network，虚拟局域网)标签和第二VLAN标签，所述第一VLAN标签用于标识是否使能网络拥塞检测，所述第二VLAN标签用于承载所述拥塞标识信息，插入的所述第一VLAN标签和第二VLAN标签随数据报文携带到下一节点。
可选地，所述中间节点或尾节点根据所述第一VLAN标签判断是否继续插入第二VLAN标签，若插入，则在数据报文中继续插入承载有自身拥塞标识信息的第二VLAN标签。
可选地，所述第一VLAN标签中的字段至少包括Init ID(Initialization Identity Document，初始化身份标识号)、Hop(跳)字段及Flow ID(流标识)字段，所述Init ID为VLAN扩展自定义数值，所述Hop字段表示已插入的VLAN标签数量，所述Hop字段在数据报文转发时逐跳加1；所述Flow ID字段用于标识使能网络拥塞检测的数据报文。
可选地，所述第二VLAN标签至少包括转发时延字段、队列深度字段，所述转发时延字段、队列深度字段用于分别标识数据报文的转发时延及队列深度。
可选地，所述第二VLAN标签还包括BW字段和B字段，所述BW字段用于表示出端口的带宽，所述B字段用于标识所增加的第二VLAN标签是否是最后一个VLAN标签，所述B字段根据第一VLAN标签中的Hop字段设置，当所述B字段标识所增加的第二VLAN标签是最后一个VLAN标签时，下一节点不再插入第二VLAN标签。
可选地，所述首节点插入拥塞标识信息的过程包括：
S101，首节点处理所述数据报文，得到拥塞信息编辑所需的第一报文信息，所述第一报文信息至少包括Flow ID、转发时延、队列深度；
S102，根据所述第一报文信息在首节点插入所述第一VLAN标签和第二VLAN标签。
可选地，所述中间节点或尾节点插入拥塞标识信息的过程包括：
S201，中间节点或尾节点处理所述数据报文，得到拥塞信息编辑所需的第二报文信息，所述第二报文信息至少包括转发时延、队列深度及第一VLAN标签中的信息；
S202，根据所述第二报文信息在中间节点或尾节点插入所述第二VLAN标签，并更新第一VLAN标签中的信息。
本发明实施例还揭示了另外一种技术方案：一种网络拥塞检测装置，所述装置包括：
发送端，用于发送数据报文给转发的首节点，并根据接收端反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率；
首节点，用于使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点；
中间节点和尾节点，至少部分节点用于逐跳在数据报文中插入自身的拥塞标识信息，所述尾节点将携带有拥塞标识信息的数据报文发送给接收端；
接收端，用于将所有的拥塞标识信息反馈回发送端。
本发明实施例的有益效果是：本发明实施例通过将交换芯片数据报文的转发时延，队列深度等信息，作为拥塞标识信息，并通过VLAN扩展字段来承载这些拥塞标识信息，沿途交换机逐跳增加VLAN扩展字段来携带网络拥塞标识信息，从而满足从发送端到接收端逐跳的网络拥塞检测，实现精细粒度的网络拥塞的检测以及实现逐跳的网络拥塞检测。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是现有IP报文首部的报文格式示意图；
图2是根据本发明实施例的网络拥塞检测方法的流程示意图；
图3是根据本发明实施例的网络拥塞检测装置的原理示意图；
图4是根据本发明实施例的两层VLAN标签的格式示意图；
图5是根据本发明实施例的转发节点对数据报文的处理流程示意图；
图6是根据本发明实施例的首节点对数据报文的处理流程示意图；
图7是根据本发明实施例中间节点或尾节点对数据报文的处理流程示意图。
具体实施方式
下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清 楚、完整的描述。
本发明实施例所揭示的一种网络拥塞检测方法及装置，解决现有基于ECN机制对网络拥塞检测无法实现精细粒度检测，以及无法实现逐跳的网络拥塞检测的问题。
结合图2和图3所示，本发明实施例所揭示的一种网络拥塞检测方法，包括以下步骤：
S100，发送端发送数据报文给转发的首节点，在首节点使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点。
可选地，结合图5和图6所示，本实施例中，首节点插入拥塞标识信息的过程包括：
S101，首节点接收到数据报文，首先进行报文解析处理，在其解析模块获取报文信息，报文信息包括目的MAC(Media Access Control，媒体访问控制)地址(MACDA)，源MAC地址(MACSA)，目的IP地址(IPDA)，源IP地址(IPSA)，三层协议类型(L3 Protocol Type)，L4源端口号，L4目的端口号等。并将解析获得的这些报文信息携带到后续的处理流程中。
S102，在首节点的入方向转发处理模块中，根据上述报文信息(例如根据数据报文的五元组信息：源IP地址，目的IP地址，源端口，目的端口，协议类型)生成唯一的Flow ID，Flow ID用于标识使能网络拥塞检测的数据报文，并将该数据报文的Flow ID携带到后续的处理流程中。
S103，在首节点的入方向时延标记模块，芯片会根据上述Flow ID记录该数据报文的入方向转发时延，并携带到后续的处理流程，用于计算出该数据报文在该芯片整体的转发时延。
S104，在首节点的队列调度模块，芯片会执行队列深度检测功能，记录该数据报文所在队列当前的深度，转化为队列缓存占用的百分比，并将 该队列深度信息携带到后续的处理流程。
S105，在首节点的出方向时延标记模块，芯片会根据Flow ID记录该数据报文的出方向转发时延，通过出方向转发时延减去入方向转发时延，计算出该数据报文在芯片整体转发时延，并将该数据报文的转发时延用于报文拥塞信息编辑。
S106，在首节点的报文编辑模块，会执行网络拥塞信息的编辑。比如根据上述步骤得到的该数据报文的转发时延，队列深度，以及出端口的带宽等信息，在数据报文中插入两层扩展VLAN标签，结合图4所示，第一层是第一VLAN标签，为引导VLAN标签，用于标识是否使能网络拥塞检测。本发明实施例考虑到在实际网络部署时，沿途的节点都需要开启该网络拥塞检测功能，所以本发明实施例采用VLAN Tag(虚拟局域网标签)来携带网络拥塞标识信息。VLAN作为传统二层转发功能，芯片支持很完善，扩展使用难度低。本发明实施例充分考虑到对芯片设计尽可能降低支持难度，同时为了降低报文序列号的开销占比，在标准VLAN定义的基础上充分利用已有的芯片能力，并最小程度来扩展VLAN使得芯片具备逐跳网络拥塞检测能力。
本实施例中，第一VLAN标签中的字段至少包括预留的Init ID、Hop字段及Flow ID字段，其中，Init ID为VLAN扩展自定义数值，用于预留特定的数值，标识该数据报文是否使能了拥塞检测功能，后续的中间节点或尾节点根据Init ID判断是否插入VLAN标签。Hop字段表示已插入的VLAN标签数量，在首节点中，Hop字段的初始值可设为1，本实施例设置最大的VLAN标签插入数量不超过8，即Hop字段的最大值为8，当然不限于数量8，可根据实际情况设置，若Hop字段值大于8，则后续的中间节点或尾节点则不继续插入VLAN标签。且在沿途的中间节点和尾节点逐跳插入扩展的VLAN标签时，会对第一VLAN标签中的Hop字段进行加1操作。Flow ID字段在上述步骤S102的入方向转发处理模块中已生成。
第二层VLAN标签用于承载拥塞标识信息，包括转发时延(Latency) 字段、BW字段、B字段和队列深度(QLen)字段，其中，转发时延字段用于转发时延的测量，用于承载上述数据报文在首节点中整体(即从入端口到出端口)的转发时延信息。本实施例中，Latency字段长度为16bit，默认单位为512ns，默认能测量的最大转发时延为65535*512ns＝32us，默认时延测量单位可灵活配置，比如可配置成256ns，或者1us等。BW字段用于表示出端口的带宽，长度为3比特位，即最大能区分8种不同速率的端口带宽，分别支持1G，10G，25G，40G，100G，200G，400G，800G，当然也限于是3比特位，可根据需要配置。B字段用于标识所增加的第二VLAN标签是否是最后一个VLAN标签，长度为1比特位。在初始状态下B字段为0，当B字段为1时，表示该VLAN是最内层VLAN，即增加的是最后一个VLAN标签，下一节点不再插入第二VLAN标签。B字段是根据第一VLAN标签中的Hop字段设置，当Hop字段达到最大值时，即如达到8时，B字段即设为1。队列深度字段用于分别标识数据报文当前所在的队列深度，为所在的队列深度占比。本实施例中，队列深度字段长度为12比特位，最细粒度为1/4096。本发明实施例将数据报文的转发时延以及队列深度，这两个信息作为检测网络拥塞是否发生拥塞和拥塞的严重程度的指标信息，当然，拥塞标识信息可根据实际需要设置，不限于这里所增加的报文信息。
可选地，上述第一VLAN标签和第二VLAN标签的长度相同，且本发明实施例设置两种VLAN标签，可以简化丢包检测机制实现的复杂度。
当完成报文编辑后，从首节点的出端口转发到下一跳网络设备(即中间节点或尾节点)。
S200，除首节点外的中间节点和尾节点，至少部分节点逐跳在数据报文中插入自身的拥塞标识信息。
可选地，本实施例中，结合图5和图7所示，中间节点或尾节点插入拥塞标识信息的过程包括：
S201，中间节点或尾节点接收到数据报文，同样先进行报文解析处理，在其解析模块获取报文信息，报文信息包括目的MAC地址(MACDA)，源MAC地址(MACSA)，目的IP地址(IPDA)，源IP地址(IPSA)，多层VLAN标签(即一层上述第一VLAN标签和至少一层上述第二VLAN标签)等。所以对于中间节点或尾节点芯片，需要增加对自定义的VLAN标签(VLAN Tag)的解析处理过程，逻辑识别自定义的第一VLAN标签中的Init ID字段以及Hop字段，Flow ID字段等，并将解析获取的这些报文信息携带到后续的处理流程中。
S102，在中间节点或尾节点的入方向转发处理模块中，根据解析获得的第一VLAN标签中的Init ID字段是否为VLAN扩展自定义数值，如果为VLAN扩展自定义数值，则表示使能网络拥塞检测功能，然后再检查Hop字段是否超出了最大值，如果不超出，则表示需要继续插入当前节点的拥塞标识信息；若超出，则不需要进行后续的步骤S203～S206，直接将数据报文从当前节点的出端口转发出去。
S203，在中间节点或尾节点的入方向时延标记模块，芯片会根据上述Flow ID记录该数据报文的入方向转发时延，并携带到后续的处理流程，用于计算出该数据报文在该芯片整体的转发时延。
S204，在中间节点或尾节点的队列调度模块，芯片会执行队列深度检测功能，记录该数据报文所在队列当前的深度，转化为队列缓存占用的百分比，并将该队列深度信息携带到后续的处理流程。
S205，在中间节点或尾节点的出方向时延标记模块，芯片会根据Flow ID记录该数据报文的出方向转发时延，通过出方向转发时延减去入方向转发时延，计算出该数据报文在芯片整体转发时延，并将该数据报文的转发时延用于报文拥塞信息编辑。
S206，在中间节点或尾节点的报文编辑模块，会执行网络拥塞信息的编辑。根据上述步骤得到的该数据报文的转发时延，队列深度，以及出端 口的带宽等信息，在数据报文中插入第二层扩展的VLAN标签，即第二VLAN标签，第二VLAN标签包括的字段及各字段的定义、长度等与上述描述相同，这里不再赘述，只是每个节点中，第二VLAN标签中承载的信息均为当前节点的报文信息(包括转发时延、队列深度、出端口带宽等)。若本跳网络设备为沿途转发路径的最后一跳，还需要将第二VLAN标签中的B字段编辑为1。最后，更新第一VLAN标签中的Hop字段，每插入一个拥塞检测扩展VLAN标签，就需要将Hop字段对应加一。
当完成报文编辑后，从中间节点或尾节点的出端口转发到下一跳网络设备(即下一跳的中间节点或尾节点或接收端)。
S300，尾节点将携带有拥塞标识信息的数据报文发送给接收端，所述接收端将所有的拥塞标识信息反馈回发送端。
S400，发送端根据反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率。
对应的，结合图3所示，本发明实施例所揭示的一种网络拥塞检测装置，包括：
发送端，用于发送数据报文给转发的首节点，并根据接收端反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率。
首节点，用于使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点。
中间节点和尾节点，至少部分节点用于逐跳在数据报文中插入自身的拥塞标识信息，所述尾节点将携带有拥塞标识信息的数据报文发送给接收端。
接收端，用于将所有的拥塞标识信息反馈回发送端。
其中，发送端、首节点、中间节点、尾节点及接收端对数据报文的处理过程及原理可对应参照上述步骤S100～S400中的描述，这里不做赘述。
本发明实施例通过芯片感知技术将报文在芯片内部的转发时延，报文转发在芯片内部的队列深度等信息，用作为网络拥塞标识信息，并利用VLAN扩展技术将这些拥塞标识信息随着数据报文逐跳携带一直到接收端，实现端到端的网络拥塞精细粒度的检测，以及实现逐跳的网络拥塞检测。
本发明实施例的技术内容及技术特征已揭示如上，然而熟悉本领域的技术人员仍可能基于本发明的教示及揭示而作种种不背离本发明精神的替换及修饰，因此，本发明保护范围应不限于实施例所揭示的内容，而应包括各种不背离本发明实施例的替换及修饰，并为本专利申请权利要求所涵盖。

Claims (12)

  1. 一种网络拥塞检测方法，所述检测方法包括：
    S100，发送端发送数据报文给转发的首节点，在所述首节点使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点；
    S200，除首节点外的中间节点和尾节点，至少部分节点逐跳在数据报文中插入自身的拥塞标识信息；
    S300，所述尾节点将携带有拥塞标识信息的数据报文发送给接收端，所述接收端将所有的拥塞标识信息反馈回发送端；
    S400，所述发送端根据反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率。
  2. 根据权利要求1所述的一种网络拥塞检测方法，其中，所述拥塞标识信息通过虚拟局域网标签携带。
  3. 根据权利要求2所述的一种网络拥塞检测方法，其中，所述首节点插入第一VLAN标签和第二VLAN标签，所述第一VLAN标签用于标识是否使能网络拥塞检测，所述第二VLAN标签用于承载所述拥塞标识信息，插入的所述第一VLAN标签和第二VLAN标签随数据报文携带到下一节点。
  4. 根据权利要求3所述的一种网络拥塞检测方法，其中，所述中间节点或尾节点根据所述第一VLAN标签判断是否继续插入第二VLAN标签，若插入，则在数据报文中继续插入承载有自身拥塞标识信息的第二VLAN标签。
  5. 根据权利要求3所述的一种网络拥塞检测方法，其中，所述第一VLAN标签中的字段至少包括Init ID、Hop字段及Flow ID字段，所述Init ID为VLAN扩展自定义数值，所述Hop字段表示已插入的VLAN标签 数量，所述Hop字段在数据报文转发时逐跳加1；所述Flow ID字段用于标识使能网络拥塞检测的数据报文。
  6. 根据权利要求5所述的一种网络拥塞检测方法，其中，所述第二VLAN标签至少包括转发时延字段、队列深度字段，所述转发时延字段、队列深度字段用于分别标识数据报文的转发时延及队列深度。
  7. 根据权利要求6所述的一种网络拥塞检测方法，其中，所述第二VLAN标签还包括BW字段和B字段，所述BW字段用于表示出端口的带宽，所述B字段用于标识所增加的第二VLAN标签是否是最后一个VLAN标签，所述B字段根据第一VLAN标签中的Hop字段设置，当所述B字段标识所增加的第二VLAN标签是最后一个VLAN标签时，下一节点不再插入第二VLAN标签。
  8. 根据权利要求3所述的一种网络拥塞检测方法，其中，所述首节点插入拥塞标识信息的过程包括：
    S101，首节点处理所述数据报文，得到拥塞信息编辑所需的第一报文信息，所述第一报文信息至少包括Flow ID、转发时延、队列深度；
    S102，根据所述第一报文信息在首节点插入所述第一VLAN标签和第二VLAN标签。
  9. 根据权利要求8所述的一种网络拥塞检测方法，其中，所述中间节点或尾节点插入拥塞标识信息的过程包括：
    S201，中间节点或尾节点处理所述数据报文，得到拥塞信息编辑所需的第二报文信息，所述第二报文信息至少包括转发时延、队列深度及第一VLAN标签中的信息；
    S202，根据所述第二报文信息在中间节点或尾节点插入所述第二VLAN标签，并更新第一VLAN标签中的信息。
  10. 一种网络拥塞检测装置，所述装置包括：
    发送端，被设置为发送数据报文给转发的首节点，并根据接收端反馈的拥塞标识信息，调整数据报文的相应参数，所述参数包括发送速率；
    首节点，被设置为使能网络拥塞检测，且将首节点的拥塞标识信息插入数据报文中，随数据报文携带至下一节点；
    中间节点和尾节点，至少部分节点被设置为逐跳在数据报文中插入自身的拥塞标识信息，所述尾节点将携带有拥塞标识信息的数据报文发送给接收端；
    接收端，被设置为将所有的拥塞标识信息反馈回发送端。
  11. 根据权利要求10所述的一种网络拥塞检测装置，其中，所述首节点插入第一VLAN标签和第二VLAN标签，所述第一VLAN标签被设置为标识是否使能网络拥塞检测，所述第二VLAN标签被设置为承载所述拥塞标识信息，插入的所述第一VLAN标签和第二VLAN标签随数据报文携带到下一节点。
  12. 根据权利要求11所述的一种网络拥塞检测装置，其中，所述中间节点或尾节点根据所述第一VLAN标签判断是否继续插入第二VLAN标签，若插入，则在数据报文中继续插入承载有自身拥塞标识信息的第二VLAN标签。
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