WO2018121257A1

WO2018121257A1 - Method, apparatus and system for sending message, and storage medium

Info

Publication number: WO2018121257A1
Application number: PCT/CN2017/115817
Authority: WO
Inventors: 邱军
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-12-30
Filing date: 2017-12-13
Publication date: 2018-07-05
Also published as: CN108270673B; CN108270673A

Abstract

The present invention provides a method, apparatus and system for sending a message, and a storage medium. The method for sending a message comprises: a client edge (CE) node receives a specified Internet control message protocol (ICMP) message sent by a provider edge (PE) node, and determines whether the specified ICMP message carries a mark indicating that an underlying network does not support fragmentation; if yes, generate, using a maximum transmission unit (MTU) in the specified ICMP message, a path maximum transmission unit (PMTU) that does not support fragmentation; send, by means of fragmentation, an IPV6 message with a length greater than the PMTU that does not support fragmentation.

Description

Message sending method, device, system and storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application Serial No. No. No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of communications, and in particular, to a message sending method, apparatus, system, and storage medium.

Background technique

The multi-protocol label switch (MPLS) application commonly used in the transition from Internet Protocol Version 4 (IPv4) to IPv6 (Internet Protocol Version 6, IPv6) is 6PE technology (Connecting). IPv6 Islands over IPv4 MPLS Using IPv6 Provider Edge Routers (6PE). FIG. 1 is a topological diagram of a 6PE network in the related art. As shown in Figure 1, the 6PE technology borrows the principle of the Border Gateway Protocol (BGP)/MPLS VPN to establish IPv4 multi-protocol BGP (MP) between the Provider Edge (PE) devices. - BGP) Peer, which distributes IPv6 routes in IPv6 sites between PE devices across IPv4 MPLS networks, and implements interworking between IPv6 islands. Data packets are forwarded using IPv4 MPLS labels on the IPv4 MPLS network.

2 is a packet Too Big message of ICMPv6 in the related art. The Path Maximum Transmission Unit (PMTU) is a technology that dynamically discovers the Maximum Transmission Unit (MTU) of any path on the Internet. Support for IPv4 networks is first defined in RFC 1191, and support for IPv6 networks is extended in RFC 1981. PMTU uses the Internet (Internet) control message protocol The Packet Too Big message of (ICMP/ICMPv6) returns the path MTU value to form PMTU information. The Packet Too Big message of ICMPv6 is shown in Figure 2.

IPv6 packets are not fragmented during transmission. Fragmentation is performed at the source node of the packet according to the detected PMTU, which promotes the wider application of PMTU in IPv6 networks. At the same time, the IPv6 protocol defines that the minimum MTU in an IPv6 network is 1280 bytes, and the corresponding minimum PMTU is also 1280 bytes. This is not a problem in a pure IPv6 network, and packets are not discarded because they are not fragmentable. However, in the IPv6 to IPv4 transition network (such as the 6in4 tunnel), the PMTU technology sometimes cannot avoid the secondary fragmentation of the underlying IPv4 network. In the 6PE network, the IPv6 packet may even be generated because the underlying MPLS network does not support fragmentation. The traffic that cannot pass through the MPLS network cannot be solved.

Assume that in the 6PE network topology, the MTU configuration of the PE node network side (MPLS domain) interface is less than 1280. When the CE node sends an IPv6 packet with a length greater than 1280 bytes, the ICMP Packet Too Big packet is sent back to the CE node. The CE node forms a PMTU entry according to the returned ICMP message. However, since the PMTU minimum value is limited to 1280, when the next packet sent by the CE node is larger than 1280 bytes, the packet is fragmented according to 1280, and the fragmented message remains. Greater than the MTU of the network side interface of the PE node. In the end, all IPv6 packets that are larger than the MTU of the PE node cannot pass the MPLS domain of the 6PE network. Therefore, when the MTU of the MPLS domain is less than 1280 in the 6PE network, there is a problem that the traffic is unreachable.

Summary of the invention

The embodiment of the invention provides a message sending method, device, system and storage medium.

According to an embodiment of the present invention, a packet sending method is provided, including: a client side edge (CE) node receives a specified Internet Control Message Protocol (ICMP) message sent by a PE node, and determines the specified ICMP message. Whether the packet carries a flag indicating that the underlying network does not support fragmentation; if the judgment result is yes, the PMTU in the specified ICMP packet is used to generate a PMTU that does not support fragmentation; The fragmented PMTU IPV6 message is sent in fragments.

In the above solution, the label of the fragment is not supported. When the MTU corresponding to the interface of the PE node is less than a predetermined threshold, the non-fragmented label is carried in the specified ICMP packet.

In the above solution, the mark that does not support fragmentation is saved in the coded field code in the specified ICMP message.

In the above solution, the predetermined threshold is 1280 bytes.

In the above solution, the specified ICMP message is an ICMP Packet Too Big message.

In the above solution, the method further includes: fragmenting the IPV6 packet to be transmitted in a manner not greater than the PMTU; and transmitting the fragmented IPV6 packet to the PE node.

According to another embodiment of the present invention, a message sending apparatus is provided, including: a determining module, configured to receive a specified ICMP message sent by a PE node, and determine whether the specified ICMP message carries a The network does not support the marking of the fragment; the generating module is configured to generate, by using the MTU in the specified ICMP packet, a PMTU that does not support fragmentation, and the sending module is configured to have a length greater than the length The IPV6 packet of the PMTU that does not support fragmentation is sent in fragments.

In the foregoing solution, the sending module includes: a fragmentation unit, configured to perform fragmentation on a manner that the IPV6 packet to be transmitted is not greater than the PMTU; and the sending unit is configured to: The IPV6 packet is sent to the PE node.

According to still another embodiment of the present invention, a message sending system is provided, including: a PE node configured to send a specified ICMP message to a CE node; and the CE node receives a specified ICMP message sent by the PE node And determining, in the specified ICMP packet, a flag indicating that the underlying network does not support fragmentation, and if the judgment result is yes, generating, by using the MTU in the specified ICMP packet, a PMTU that does not support fragmentation. The fragmentation is sent to the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.

In the above solution, the PE node is further configured to: when the MTU corresponding to the interface of the PE node is less than a predetermined threshold, save the label that does not support fragmentation in the specified ICMP packet;

In the foregoing solution, the CE node is further configured to perform the fragmentation of the IPV6 packet to be transmitted in a manner that is not greater than the PMTU; and send the fragmented IPV6 packet to be transmitted to the fragmented The PE node.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

S1. The CE node receives the specified ICMP packet sent by the PE node, and determines whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation.

S2, in the case that the determination result is yes, generating, by using the MTU in the specified ICMP message, a PMTU that does not support fragmentation;

S3. Perform fragmentation on the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.

That is, an embodiment of the present invention further provides a storage medium having stored thereon a computer program, the computer program being executed by the processor when the steps of any of the above methods.

According to the embodiment of the present invention, the PMTU generated by the MTU of the largest transmission unit in the ICMP message corresponding to the fragment that is not supported by the PE node is used for fragment transmission of the IPv6 packet, so that the 6PE existing in the related art can be solved. When the MTU of the MPLS domain is less than 1280 in the network, there is a problem that the traffic is unreachable. At the same time, it can achieve the effect of traffic conduction even when the MTU configuration is too small.

DRAWINGS

The drawings are intended to provide a further understanding of the embodiments of the invention, and are intended to illustrate the invention. In the drawing:

1 is a topological diagram of a 6PE network in the related art;

2 is a schematic structural diagram of a Packet Too Big packet of ICMPv6 in the related art;

3 is a block diagram showing the hardware structure of a mobile terminal for transmitting a message according to an embodiment of the present invention;

4 is a flowchart of a method for sending a message according to an embodiment of the present invention;

FIG. 5 is a flowchart of another packet sending according to an embodiment of the present invention; FIG.

FIG. 6 is a structural diagram of a message sending apparatus according to an embodiment of the present invention; FIG.

FIG. 7 is a structural diagram of another message transmitting apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a structural diagram of a message transmitting system according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The method embodiment provided by Embodiment 1 of the present application can be executed in a mobile terminal, a computer terminal or the like. Taking a mobile terminal as an example, FIG. 3 is a hardware structural block diagram of a mobile terminal for transmitting a message according to an embodiment of the present invention. As shown in FIG. 3, the mobile terminal 30 may include one or more (only one shown) processor 302 (the processor 302 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA). A memory 304 configured to store data and a transmission device 306 configured as a communication function. It will be understood by those skilled in the art that the structure shown in FIG. 3 is merely illustrative and does not limit the structure of the above electronic device. For example, the mobile terminal 30 may also include more or fewer components than those shown in FIG. 3, or have a different configuration than that shown in FIG.

The memory 304 can be configured as a software program and a module for storing application software, such as a program instruction/module corresponding to the message sending method in the embodiment of the present invention, and the processor 302 executes by executing a software program and a module stored in the memory 304. Various functional applications and data processing, that is, the above methods are implemented. Memory 304 can include high speed random access memory and can also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 304 can further include memory remotely located relative to processor 302, which can be connected to mobile terminal 30 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 306 is configured to receive or transmit data via a network. The above-described network specific example may include a wireless network provided by a communication provider of the mobile terminal 30. In one example, the transmission device 306 includes a Network Interface Controller (NIC). It can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 306 can be a Radio Frequency (RF) module configured to communicate with the Internet wirelessly.

In this embodiment, a packet sending method is provided in the network topology diagram shown in FIG. 4 and the mobile terminal shown in FIG. 3, and FIG. 4 is a packet sending method according to an embodiment of the present invention. The flow chart, as shown in FIG. 4, includes the following steps:

Step S402: The CE node receives the specified ICMP packet sent by the PE node, and determines whether the specified ICMP packet carries a flag configured to indicate that the underlying network does not support fragmentation.

In an embodiment, the label that does not support fragmentation is saved in the specified ICMP message when the MTU corresponding to the interface of the PE node is less than a predetermined threshold. Specifically, the predetermined threshold is 1280 bytes.

In an embodiment, the tag that does not support fragmentation is stored in the encoded field code in the specified ICMP message.

In an embodiment, the designated ICMP message may be an ICMP Packet Too Big message.

Step S404, if the result of the determination is yes, the PMTU in the specified ICMP message is used to generate a PMTU that does not support fragmentation;

Step S406, performing fragment transmission on the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.

In an embodiment, the fragment transmission process may include: fragmenting the IPV6 packet to be transmitted in a manner not greater than the PMTU; and transmitting the fragmented IPV6 packet to the PE. node.

In an embodiment, after the PE node receives the IPV6 packet to be transmitted after the fragment sent by the CE node, the fragmented IPv6 packet is encapsulated and then forwarded through the MPLS network. A PE node of an IPv6 network receives and sends it to a CE node in another IPv6 network.

Specifically, a scenario based on the foregoing ideas is also provided in this embodiment, so as to understand the technical solution to be protected in this embodiment.

FIG. 5 is a flow chart of another message transmission according to an embodiment of the present invention. As shown in Figure 5, the CE1 node in the scenario is configured as 1500, and the MTU on the network side of the PE1 is configured as 1000. The length of the transmitted IPv6 packet is 1400 bytes.

S51. Send a 1400-byte IPv6 packet from the CE1 node to the CE2 node.

S52: When the IPv6 packet is forwarded by the PE1 node, the IPv6 packet is forwarded to the outbound interface. The length of the IPv6 packet is greater than the MTU of the outbound interface, and an ICMP Packet Too Big packet is generated. The MTU value in the packet is filled in as the outbound interface. The MTU value is the number of bytes occupied by the label, and since it is forwarded to the MPLS network that does not support fragmentation, the Code field does not support the fragmentation flag;

S53. Send the ICMPv6 Packet Too Big packet to the CE1 node.

S54: When receiving the ICMPv6 Packet Too Big packet, the CE1 node extracts the MTU value and the Code field in the packet. Since the code field is filled in, the fragmentation flag is not supported. Therefore, an unsupported fragment PMTU entry is generated according to the MTU actual value 996. Even if the MTU value is less than 1280;

S55, the CE1 node sends an IPv6 packet of 1400 bytes to the CE2 node again. The packet length is greater than the PMTU value just generated. The IPv6 packet is fragmented according to the newly generated PMTU value. IPv6 packets larger than the PMTU value;

S56: The CE1 node sends the two IPv6 packets that are not larger than the PMTU after the fragmentation.

S57: When receiving the two IPv6 packets that are not larger than the egress MTU, the PE1 node encapsulates the label and forwards the packet through the MPLS network.

Through the above steps, when the MPLS domain MTU is configured to be less than 1280 in the 6PE network in the related art, the problem that the traffic is unreachable may be solved. At the same time, it can achieve the effect of traffic conduction even when the MTU configuration is too small.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

Example 2

In this embodiment, a message sending apparatus is further provided, and the apparatus is configured to implement the foregoing embodiments, and details have been omitted for description. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 6 is a structural diagram of a message sending apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes:

The determining module 62 is configured to receive the specified ICMP packet sent by the PE node, and determine whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation.

The generating module 64 is configured to generate, by using the MTU in the specified ICMP message, a PMTU that does not support fragmentation, if the determination result is yes;

The sending module 66 is configured to perform fragment transmission on the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.

FIG. 7 is a structural diagram of another packet sending apparatus according to an embodiment of the present invention. As shown in FIG. 7, the transmitting module 66 further includes:

The fragmentation unit 72 is configured to perform fragmentation on a manner that the IPV6 packet to be transmitted is not greater than the PMTU.

The sending unit 74 is configured to send the fragmented IPV6 message to be transmitted to the PE node.

In an embodiment, the label that does not support fragmentation is saved in the specified ICMP message when the MTU corresponding to the interface of the PE node is less than a predetermined threshold.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Example 3

In this embodiment, a message sending system is further provided, and the system is configured to implement the foregoing The examples have not been described again.

FIG. 8 is a structural diagram of a message sending system according to an embodiment of the present invention. As shown in FIG. 8, the device includes:

The PE node 82 is configured to send, to the CE node 84, an Internet Designated Control Message Protocol (ICMP) packet;

The CE node 84 receives the specified ICMP packet sent by the PE node 82, and determines whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation, and if the judgment result is yes, And generating, by using a maximum transmission unit MTU in the specified ICMP packet, a path maximum transmission unit (PMTU) that does not support fragmentation; and performing fragmentation transmission on an IPV6 packet whose length is greater than the PMTU that does not support fragmentation.

In an embodiment, the PE node 82 is further configured to save, in the specified ICMP message, a flag that does not support fragmentation when the MTU corresponding to the interface of the PE node 82 is less than a predetermined threshold.

In an embodiment, the CE node 84 is further configured to fragment the IPV6 packet to be transmitted in a manner that is not greater than the PMTU, and send the fragmented IPV6 packet to be sent to the PE node 82.

Example 4

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc. Specifically, it may be a computer readable storage medium.

That is, the embodiment of the present invention provides a storage medium on which a computer program is stored, and when the computer program is executed by the processor, the steps of the method in the embodiment of the present invention are implemented.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

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

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In the solution provided by the embodiment of the present invention, the CE node receives the specified ICMP packet sent by the PE node, and determines whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation; And generating, by using the MTU in the specified ICMP packet, a PMTU that does not support fragmentation; and performing fragmentation transmission on the IPV6 packet that is longer than the PMTU that does not support the fragmentation; by using the PE node in the embodiment of the present invention The PMTU generated by the MTU in the ICMP packet corresponding to the fragment that is not supported by the fragment is fragmented and transmitted to the IPv6 packet, and the traffic can be turned on even when the MTU configuration is too small.

Claims

A method for sending a message, comprising:

The customer side edge CE node receives the specified Internet Control Message Protocol (ICMP) packet sent by the network side edge PE node, and determines whether the specified ICMP message carries a flag indicating that the underlying network does not support fragmentation;

If the result of the determination is yes, the path maximum transmission unit PMTU that does not support fragmentation is generated by using the maximum transmission unit MTU in the specified ICMP message;

The fragmentation is sent to the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.
The method according to claim 1, wherein the method further comprises: when the MTU corresponding to the interface of the PE node is less than a predetermined threshold, carrying the label that does not support fragmentation in the specified ICMP message. in.
The method of claim 2, wherein the flag that does not support fragmentation is stored in an encoded field code in the specified ICMP message.
The method of claim 2 wherein said predetermined threshold is 1280 bytes.
The method of claim 1, wherein the designated ICMP message is an ICMP Packet Too Big message.
The method of claim 1 wherein the method further comprises:

Fragmenting the IPV6 packet to be transmitted in a manner not greater than the PMTU;

Sending the fragmented IPV6 message to be transmitted to the PE node.
A message sending device is located at a client side edge CE node, and includes:

The determining module is configured to receive the specified Internet Control Message Protocol (ICMP) packet sent by the network edge PE node, and determine whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation;

a generating module, configured to generate, by using a maximum transmission unit MTU in the specified ICMP packet, a path maximum transmission unit PMTU that does not support fragmentation, if the determination result is yes;

The sending module is configured to perform fragmentation sending on the IPV6 packet whose length is greater than the PMTU that does not support fragmentation.
The apparatus of claim 7, wherein the transmitting module comprises:

The fragmentation unit is configured to perform fragmentation on a manner that the IPV6 packet to be transmitted is not greater than the PMTU;

The sending unit is configured to send the fragmented IPV6 message to be transmitted to the PE node.
A message sending system includes:

The network side edge PE node is configured to send the specified Internet Control Message Protocol (ICMP) message to the client side edge CE node;

The CE node receives the specified ICMP packet sent by the PE node, and determines whether the specified ICMP packet carries a flag indicating that the underlying network does not support fragmentation, and if the judgment result is yes, the UE uses The maximum transmission unit MTU in the specified ICMP packet generates a path maximum transmission unit PMTU that does not support fragmentation, and performs fragment transmission on an IPV6 packet whose length is greater than the PMTU that does not support fragmentation.
The system of claim 9, wherein the PE node is further configured to: when the MTU corresponding to the interface of the PE node is less than a predetermined threshold, the non-fragmented tag is carried in the specified ICMP message. .
The system of claim 9, wherein the CE node is further configured to slice the IPV6 message to be transmitted in a manner not greater than the PMTU; and to slice the IPV6 message to be transmitted. Sent to the PE node.
A storage medium having stored thereon a computer program, the computer program being executed by a processor to perform the steps of the method of any one of claims 1 to 6.