WO2009012695A1

WO2009012695A1 - A method and device for transmitting protocol information

Info

Publication number: WO2009012695A1
Application number: PCT/CN2008/071656
Authority: WO
Inventors: Yuanlong Jiang; Yang Yang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-07-20
Filing date: 2008-07-16
Publication date: 2009-01-29
Also published as: CN101350693A; CN101350693B

Abstract

It involves a method for transmitting and receiving protocol information and transmitting and receiving device in communication field. The transmitting method includes: constructing protocol information, constructing IPv6 grouping header, adding protocol information in the payload field of IPv6 grouping, and forming IPv6 grouping with IPv6 grouping header, and marking the IPv6 grouping as a null packet in the IPv6 grouping header, identifying the node which needs to analyze and process protocol information on communication path in the IPv6 grouping header, and sending out the IPv6 grouping. By IPv6 protocol extension, it is used to transmitting protocol information, and is compatible with normal IPv6 protocol, it can assure protocol information simple form and analyzing conveniently.

Description

Method and device for transmitting protocol information

The present invention relates to the field of communications, and in particular, to a method and apparatus for transmitting protocol information, and a method and apparatus for receiving protocol information.

Background technique

At present, the Internet mainly uses IPv4 technology. However, with the rapid development of various network applications and services, users have increased dramatically. IPv4 technology faces some difficult difficulties, such as exhaustion of IP addresses and real-time service QoS (Qua li Ty of Service, quality of service) lack of support and other aspects. IPv6 technology has obvious advantages in terms of address quantity, security, quality of service, mobility, and so on. Therefore, networks using IPv6 (Internet Protocol Version 6, Internet Protocol version 6) will be more scalable and easier to provide QoS services to users than existing IPv4 networks.

See Figure 1, which is an IPv6 packet format that contains a basic header and an optional number of extended headers, as well as optional upper layer protocol payloads. The basic header consists of the version number (value is fixed to 6), stream type, stream label, PL (Playload Leng th, payload length), should (Next Header, next header), HL ( Hop Limi t , path segment limit ), source address, destination address consists of 8 fields. There are many IPv6 extension headers, including: hop-by-hop option header, destination option header, routing header, fragment header, authentication header, encapsulating security payload header, 匪H (No Next Header, an IPv6 extension header), etc. They can be combined into an IPv6 packet according to certain rules. Whether it is a basic header or an extended header, the Next Header field indicates the extended header type or upper protocol type that follows.

IPv6 is the basic technology of the next generation Internet. The prior art proposes a number of extension protocols for it. Usually, these protocols need to define their own signaling information. See Figure 2, which shows a typical protocol information encapsulation format.

IP telecommunications networks are likely to become the future direction of telecommunications networks. However, currently IPv6 itself The 0AM (Operation Management and Maintenance) function required by the telecommunication network cannot be supported. 0AM is a tool for monitoring and resolving network problems. It reports the status of the network, enabling network administrators to manage the network more efficiently, including link performance monitoring, fault detection and alerting, loop testing, and remote MIB (Management Information Base) variable requests. As a general mechanism for interoperability and mutual maintenance of devices, 0AM includes basic 0AM connection, link monitoring, remote fault diagnosis, remote loopback and remote MIB variable requests. Summary of the invention

The embodiment of the invention provides a method for transmitting protocol information, for example: protocol information of the 0AM function required for transmitting a telecommunication network.

In order to solve the above problem, an embodiment of the present invention provides a method, a receiving method, and a network node for transmitting protocol information, and the technical solution is as follows:

First, an embodiment of the present invention provides a method for sending protocol information, where the method includes: constructing protocol information;

Construct an IPv6 packet header;

Adding the protocol information to a payload area of an IPv6 packet, and the IPv6 packet header forms an IPv6 packet, and marking the IPv6 packet as an IPv6 empty packet in the IPv6 packet header;

A node that processes the protocol information needs to be parsed on the IPv6 packet header identification transmission path, and the IPv6 packet is sent out.

The embodiment of the present invention further provides a method for receiving protocol information, where the method includes: receiving an IPv6 packet;

Determining, if the IPv6 packet is an IPv6 null packet, determining whether the IPv6 packet includes protocol information, and determining, according to the header of the IPv6 packet, whether the current node that receives the IPv6 packet is parsing and processing the protocol information. Node

When it is determined that the current node is a node that parses the protocol information, the IPv6 packet is parsed, and the protocol information is parsed and processed.

An embodiment of the present invention further provides an apparatus for transmitting protocol information, where the apparatus includes: a protocol information construction module for constructing protocol information;

a packet header construction module for constructing an IPv6 packet header;

a packet construction module, configured to join the protocol information in a payload area of an IPv6 packet, and the IPv6 packet header forms an IPv6 packet, and mark the IPv6 packet as an IPv6 empty packet in the IPv6 packet header;

And a sending module, configured to: in the IPv6 packet header identifier transmission path, parse the node that processes the protocol information, and send the IPv6 packet.

An embodiment of the present invention further provides an apparatus for receiving protocol information, where the apparatus includes: a receiving module, configured to receive an IPv6 packet;

a first determining module, configured to determine, according to whether the basic header payload length field of the IPv6 packet is greater than a length of all extended headers, whether the IPv6 packet is included in the protocol information when the IPv6 packet is an IPv6 null packet IPv6 packet;

a second determining module, configured to: when the first determining module determines that the IPv6 packet is a packet that includes protocol information, determine, according to a header of the IPv6 packet, whether the current node is a node that parses the protocol information;

The parsing processing module is configured to parse the IPv6 packet when the IPv6 packet includes protocol information, and parse and process the protocol information.

The above embodiment of the present invention enhances the transmission function of the protocol information by using the IPv6 null packet feature by directly encapsulating the extended protocol information into the payload area after the header of the IPv6 packet, and is backward compatible with the conventional IPv6 protocol, and the extended protocol information. It can be transparently transmitted on the intermediate nodes of traditional IPv6 routers, thus ensuring network interoperability, and it is easier to implement without IETF assigning new Next Header types or adding new option data types. Based on this method, complex protocol information can be constructed, and the simplicity of the form and the ease of analysis are maintained, and the forwarding speed is improved. DRAWINGS

1 is a schematic diagram of a packet format of IPv6 in the prior art;

2 is a schematic diagram of a typical protocol information encapsulation format; 3 is a schematic diagram of an IPv6 packet including protocol information according to Embodiment 1 of the present invention; FIG. 4 is a flowchart of a method for transmitting protocol information according to Embodiment 1 of the present invention;

FIG. 5 is a flowchart of a method for receiving protocol information according to Embodiment 1 of the present invention; FIG.

6 is a flow chart of receiving processing of any IPv6 packet according to Embodiment 3 of the present invention;

7 is a schematic diagram of a transmission protocol information apparatus according to Embodiment 4 of the present invention;

FIG. 8 is a schematic diagram of a receiving protocol information apparatus according to Embodiment 5 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

According to the IPv6 specification, if the Next Header field of the IPv6 base header or any extension header is 59, it means that there is nothing after the header, so this header type actually defines an empty packet. It also states that any such null packet, even if its IPv6 payload length indicates that there are extra bytes thereafter, should ignore the bytes and forward the packet unchanged.

As shown in FIG. 4, Embodiment 1 of the present invention provides a method for transmitting protocol information. In order to transmit some protocol information that satisfies the application requirements, according to the technical solution of the present invention, an IPv6 packet is configured as a null packet, wherein the IPv6 packet includes the protocol information. details as follows:

Step 101: Construct protocol information.

The format of the protocol information is as shown in Fig. 2. The present invention does not limit the configuration format of the protocol information, and any application that satisfies the configuration requirements of the protocol information itself and is arbitrarily expanded as needed is applicable to the present invention.

The protocol type, version, and protocol function number are defined according to the content of the protocol information that needs to be transmitted, and the above three pieces of information are used as the header of the protocol information format, followed by the data for placing the protocol information. Step 102: Construct an IPv6 packet header.

The load length field value of the basic header of the IPv6 packet is set equal to the sum of the lengths of all extension headers and the protocol information.

Depending on the needs of the application, you can choose whether to use the extended header that conforms to the IPv6 protocol and select any one or more extension headers. Therefore, the packet header can be the IPv6 basic header, or the IPv6 basic header and the IPv6-compliant protocol. A combination of extended headers.

Step 103: Add the protocol information in a payload area of an IPv6 packet, and the IPv6 packet header forms an IPv6 packet, and mark the IPv6 packet as an IPv6 empty packet in the IPv6 packet header; if there is no extension header, The Next Header field of the basic header of the IPv6 packet is set to 59 (when there is no extension header), and if so, the Next Header field of the last extended header is set to 59, so that the IPv6 packet is an IPv6 empty packet.

The protocol information is encapsulated in the format shown in Figure 2 and placed in the payload area of the IPv6 packet. Figure 3 shows a schematic diagram of an IPv6 packet containing protocol information. The left picture is the payload area after the protocol information is directly encapsulated in the basic header, and the right picture is the payload area after the protocol information is encapsulated in the extension header. For example, when the protocol information is 0AM protocol information, the 0AM protocol information is encapsulated and placed in the payload area of the IPv6 null packet.

At this time, the payload length field value of the basic header of the constructed IPv6 packet can reflect the sum of the length of the 0AM protocol information carried and the length of all the extension headers of the packet.

Step 104: The node that needs to parse the protocol information needs to be parsed on the IPv6 packet header identifier transmission path, and send the IPv6 packet.

For example, when the IPv6 packet includes only the basic header, the flow label of the basic header is used to identify a node that parses the protocol information, or when the IPv6 packet includes both the basic header and other types of extension headers, The header is extended to identify the node that parses the protocol information. For example, when an IPv6 packet includes both a basic header and other types of extension headers, there are the following cases, and embodiments of the present invention are not limited to the following cases in which an extension header is used.

When the extended header included in the IPv6 packet is a directory header and a header, the identifier is transmitted. All nodes on the transport path are nodes that resolve the protocol information; or

When the extended header included in the IPv6 packet is a destination option header and a 首H header, the identifier destination node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is a route extension header and a 首H header, the node specified by the routing header is identified as a node that parses the protocol information.

As shown in FIG. 5, it is a flowchart of a method for receiving protocol information according to Embodiment 2 of the present invention, where the receiving method specifically includes:

Step 201: Receive an IPv6 packet.

Step 202: When the received IPv6 packet is an IPv6 null packet, determine whether the IPv6 packet includes protocol information, and determine, according to the header of the IPv6 packet, whether the current node that receives the IPv6 packet is an analysis processing station. a node describing the protocol information;

Wherein, when the IPv6 packet has a header with a Header value of 59, the IPv6 packet is an IPv6 null packet.

Continuing to determine whether the IPv6 packet includes protocol information, specifically: when the IPv6 packet is an IPv6 null packet, and when a payload length field of a basic header of the IPv6 packet is equal to a sum of lengths of all extended headers and the protocol information The IPv6 packet contains protocol information.

Step 203: When it is determined that the current node is a node that parses the protocol information, parsing the IPv6 packet, and parsing and processing the protocol information.

The step of determining whether the current node is a node for parsing the protocol information includes:

Extracting a header of the IPv6 packet;

When the IPv6 packet includes only the basic header, the flow label of the basic header of the IPv6 packet identifies whether the current node is a node that parses the protocol information;

Or

When the IPv6 packet includes both the basic header and other types of extension headers, it is identified according to the extended header used whether the current node is a node that parses the protocol information. For example: when the extended header included in the IPv6 packet is a directory header and a header, the current node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is a destination option header and a header, and the current node is a destination node, the current node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is a route extension header and a header, and the current node is specified by the routing header, the current node is a node that parses the protocol information.

As shown in FIG. 6, for any one of the IPv6 packets, the process of receiving and processing the IPv6 packet in Embodiment 3 of the present invention is as follows:

Receiving IPv6 packets;

Determine whether the IPv6 packet is an IPv6 empty packet:

When the received IPv6 packet is an IPv6 empty packet, it is determined whether the IPv6 packet includes protocol information, and when the IPv6 packet does not include protocol information, determining whether the current node is a destination node, and completing processing of the IPv6 packet, Otherwise, the IPv6 packet is directly forwarded; or, when the received IPv6 packet is not a null packet, and any of the headers identifies that the IPv6 packet includes upper layer protocol information, the upper layer protocol information is processed;

When the IPv6 packet is an IPv6 null packet and contains protocol information, according to the header of the IPv6 packet, it is determined whether the current node is a node that parses the protocol information.

When it is determined that the current node is a node that parses the protocol information, the protocol information is parsed.

When the current node is a traditional IPv6 router, the IPv6 packet is directly forwarded.

It is determined whether the IPv6 packet arrives at the destination node, and when the current node is the destination node, the processing of the IPv6 packet is completed, otherwise it will be forwarded.

Referring to FIG. 7, Embodiment 4 of the present invention further provides an apparatus for transmitting protocol information, where the apparatus includes:

a protocol information construction module 101, configured to construct protocol information;

a packet header construction module 102, configured to construct an IPv6 packet header; a packet construction module 103, configured to join the protocol information in a payload area of an IPv6 packet, and the IPv6 packet header forms an IPv6 packet, and mark, in the IPv6 packet header, the IPv6 packet as an IPv6 empty packet;

The sending module 104 is configured to: in the IPv6 packet header identifier transmission path, a node that needs to parse the protocol information, and send the IPv6 packet.

As shown in FIG. 7, the packet header construction module 102 includes:

a first padding unit, configured to fill a Next Header field of the header of the IPv6 packet, where the IPv6 packet is an IPv6 empty packet;

And a second padding unit, configured to fill a payload length field of a header of the IPv6 packet.

The sending module 104 further includes:

a node identification unit, configured to use a flow label of the basic header to identify a node that parses the protocol information when the IPv6 packet includes only a basic header, or when an IPv6 packet includes a basic header and other types of extended headers simultaneously And for identifying, by using the extended header used, a node that parses the protocol information.

For example, when an IPv6 packet includes both a basic header and other types of extension headers, there are several cases, and embodiments of the present invention are not limited to the following cases in which an extension header is used.

When the extended header included in the IPv6 packet is a hop-by-hop option header and a header, the node for identifying all nodes on the transmission path for parsing the protocol information; or

And the extension header included in the IPv6 packet is a destination option header and a header, and is used to identify that the destination node is a node that parses the protocol information; or

When the IPv6 packet includes an extension header, the routing extension header and the header, the node designated by the routing header is used to parse the protocol information.

Referring to FIG. 8, the embodiment 5 of the present invention further provides an apparatus for receiving protocol information, where the apparatus includes:

The receiving module 201 is configured to receive an IPv6 packet.

The first determining module 202 is configured to: when the IPv6 packet is an IPv6 empty packet, according to the IPv6 Whether the basic header payload length field of the packet is greater than the sum of the lengths of all extension headers

Whether the IPv6 packet is an IPv6 packet containing protocol information;

The second determining module 203 is configured to: when the first determining module determines that the IPv6 packet is a packet that includes protocol information, determine, according to a header of the IPv6 packet, whether the current node is a node that parses the protocol information;

The parsing processing module 204 is configured to parse the IPv6 packet when the IPv6 packet includes protocol information, and parse and process the protocol information.

When the current node is a node that parses the protocol information, and the received packet contains protocol information, the parsing processing module 204 parses the received packet and extracts the protocol information.

When the current node is a node that parses the protocol information but is not a destination node, after parsing the protocol information, forwarding the IPv6 packet, or when the current node is not parsing the When the node of the protocol information is not the destination node, the IPv6 packet is directly forwarded until the current node is the destination node.

The receiving device, as described above, the second determining module 203 specifically includes:

An information extraction module, configured to extract header information in the IPv6 packet;

a node determining module, configured to determine, according to an identifier of a basic header flow label of the IPv6 packet, whether the current node is a node that parses the protocol information, when the IPv6 packet includes only a basic header;

Or,

When the IPv6 packet includes both the basic header and other types of extension headers, it is used to determine whether the current node is a node that parses the protocol information according to the identifier of the extended header used.

The method for determining whether the current node is the node for parsing the protocol information according to the header of the IPv6 packet includes the following cases. The embodiment of the present invention is not limited to the following cases where the extended header is used. When the extended header included in the IPv6 packet is a hop-by-hop option header and a 匪H header, the current node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is the destination option header and the 匪H header, and the current node is the destination node, the current node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is a route extension header and a 首H header, and the current node is specified by the routing header, the current node is a node that parses the protocol information.

As can be seen from the description of the foregoing embodiments, the embodiment of the present invention provides a method for transmitting protocol information, and by using the IPv6 null packet feature, the protocol information is directly encapsulated into a payload area after the header of the IPv6 packet, and the protocol information is enhanced. The transfer function, and the extended protocol information can be transparently transmitted on the intermediate nodes of the traditional IPv6 router, thereby ensuring the interoperability of the network, and the IETF does not need to allocate a new Next Header type or add a new option data type, which is easy to implement. At the same time, it can be fully compatible with the conventional IPv6 protocol, ensuring the interoperability of IPv6 compatible networks, and also ensuring the simplicity of the protocol information form and the ease of analysis, and improving the forwarding speed.

Claims

Claim

A method for transmitting protocol information, the method comprising:

Constructing protocol information;

Construct an IPv6 packet header;

Adding the protocol information in a payload area of the IPv6 packet, and the IPv6 packet header forms an IPv6 packet, and marking the IPv6 packet as an IPv6 empty packet in the IPv6 packet header;

The method for transmitting protocol information according to claim 1, wherein the marking the IPv6 packet as an IPv6 empty packet comprises:

When the IPv6 packet includes only the basic header, setting the Next Header field value of the basic header to 59;

When the IPv6 packet includes both the basic header and other types of extension headers, the Next Header field value of the last extension header is set to 59.

The method for transmitting protocol information according to claim 2, wherein the constructing the IPv6 packet header comprises:

The payload length field value of the basic header of the IPv6 packet is set equal to the sum of the lengths of all extension headers and the protocol information.

The method for transmitting protocol information according to claim 1, wherein the node that needs to parse the protocol information on the IPv6 packet header identification transmission path comprises: when the IPv6 packet When only the basic header is included, the flow label of the basic header is set to identify the node that parses the protocol information, or

When the IPv6 packet includes both the base header and other types of extension headers, the node that processes the protocol information is parsed according to the extended header identifier used.

The method for transmitting protocol information according to claim 4, wherein when the IPv6 packet includes a basic header and other types of extension headers, according to the extended header used The node that identifies and parses the protocol information includes:

When the extended header included in the IPv6 packet is an option header and a header, identifying all nodes on the transmission path as nodes for parsing the protocol information; or

When the extended header included in the IPv6 packet is a destination option header and a header, the identifier destination node is a node that parses the protocol information; or

When the extended header included in the IPv6 packet is a route extension header and a header, the node specified by the routing header is identified as a node that parses the protocol information.

The method for transmitting protocol information according to any one of claims 1 to 5, wherein the protocol information is operation management and maintenance protocol information.

A method for receiving protocol information, the method comprising:

Receiving IPv6 packets;

The method for receiving protocol information according to claim 7, wherein the step of determining whether the IPv6 packet includes protocol information comprises:

It is judged whether the payload length field of the basic header of the IPv6 packet is equal to the sum of all extension headers and the length of the protocol information, and the IPv6 packet contains protocol information.

The method for receiving protocol information according to claim 7, wherein, according to the header of the IPv6 packet, determining whether a current node that receives the IPv6 packet is parsing and processing the protocol information The steps of the node, including:

Extracting a header of the IPv6 packet;

When the IPv6 packet includes only the basic header, determining, according to the flow label identifier of the basic header of the IPv6 packet, whether the current node is a node that parses the protocol information; or

When the IPv6 packet includes both the basic header and other types of extension headers, it is confirmed according to the identifier of the extension header whether the current node is a node that parses the protocol information.

The method for receiving protocol information according to claim 9, wherein when the IPv6 packet includes a basic header and other types of extension headers, the current node is identified according to an extended header used. Whether it is a node that parses the protocol information, including:

When the extended header included in the IPv6 packet is a hop-by-hop option header and a 首H header, the current node is a node that parses the protocol information; or

The method for receiving protocol information according to any one of claims 7 to 10, wherein the method comprises:

After the current node parses the protocol information, or when the current node is not a node that parses the protocol information, it is determined whether the current node is a destination node, and then the forwarding process of the IPv6 packet is completed. , otherwise forward the IPv6 packet.

The method for receiving protocol information according to claim 11, wherein when the current node that receives the IPv6 packet is determined to be a conventional IPv6 router, the IPv6 packet is directly forwarded.

A device for transmitting protocol information, characterized in that the device comprises:

a protocol information construction module for constructing protocol information;

a packet header construction module for constructing an IPv6 packet header;

a packet construction module, configured to join the protocol information in a payload area of an IPv6 packet, and the IPv6 packet header constitutes an IPv6 packet, and mark the IPv6 packet as an IPv6 empty packet in the IPv6 packet header; And a sending module, configured to parse the node that processes the protocol information on the IPv6 packet header identifier transmission path, and send the IPv6 packet.

14. The apparatus for transmitting protocol information according to claim 13, wherein the packet header construction module comprises:

a first padding unit, configured to fill a Next Header field of the IPv6 packet header, to mark the IPv6 packet as an IPv6 empty packet;

And a second padding unit, configured to fill a payload length field of a basic header of the IPv6 packet.

The device for transmitting protocol information according to claim 13, wherein the sending module further comprises:

16. An apparatus for receiving protocol information, the apparatus comprising:

a receiving module, configured to receive an IPv6 packet;

a first determining module, configured to determine, according to whether a payload length field of a basic header of the IPv6 packet is greater than a length of all extended headers, whether the IPv6 packet is included in the protocol information when the IPv6 packet is an IPv6 null packet IPv6 packet;

a second determining module, configured to: when the first determining module determines that the IPv6 packet is a packet that includes protocol information, determine, according to a header of the IPv6 packet, whether the current node that receives the IPv6 packet is parsing and processing the protocol information Node

The device for receiving protocol information according to claim 16, wherein the second determining module comprises:

An information extraction module, configured to extract header information in the IPv6 packet; a node judging module, configured to: when the IPv6 packet includes only the basic header, determine, according to the identifier of the basic header flow label of the IPv6 packet, whether the current node is a node that parses the protocol information; or, when When the IPv6 packet includes the basic header and other types of extension headers, it is used to determine whether the current node is a node that parses the protocol information according to the identifier of the extended header used.