CN108075950B

CN108075950B - Method for detecting end-to-end path of packet access network

Info

Publication number: CN108075950B
Application number: CN201711328604.9A
Authority: CN
Inventors: 武增勋
Original assignee: Anhui Wantong Post And Telecommunications Co ltd
Current assignee: Anhui Wantong Post And Telecommunications Co ltd
Priority date: 2017-12-13
Filing date: 2017-12-13
Publication date: 2021-07-20
Anticipated expiration: 2037-12-13
Also published as: CN108075950A

Abstract

A method for detecting an end-to-end path of a packet access network comprises the following steps: utilizing the existing network to establish GRE tunnel between the node network elements to be detected, the tunnel path is the same as the path of the required bearing service; the network elements for establishing the GRE tunnel can be mutually regarded as direct connection of the next hop, and the node information of each other is transmitted between GRE interfaces; and configuring a protocol function capable of detecting the detection of the direct connection path on the GRE interface created by the network element so as to achieve the purpose of detecting the end-to-end path. The invention uses the traditional IP packet forwarding technology, can simply realize the control of the forwarding path; the disposition of an end-to-end detection path is easy to realize by using the GRE tunnel technology based on IP packet forwarding; the existing link level detection technology is used, end-to-end path detection is realized on a logically directly connected tunnel interface, and new protocol extension is not needed.

Description

Method for detecting end-to-end path of packet access network

Technical Field

The invention relates to the technical field of network communication, in particular to a method for detecting an end-to-end path of a packet access network.

Background

A packet access network is a special transmission network specially established for enterprise users by using a currently established packetized mobile data return network (IPRAN/PTN/UTN) to meet the requirements of data communication of government and enterprise users while old transmission networks are reconstructed by various domestic main communication operators, so that a solution for enabling the government and enterprise users to exclusively share various high-quality communication services and informationized services is realized. Meanwhile, in order to ensure high availability of service data transmission, a detection technology is generally configured on such an end-to-end transmission path, so as to implement effective measurement before activation and real-time monitoring in service bearing.

The general packet access network end-to-end path detection implementation has the following characteristics:

● path forwarding is implemented based on IP packetization techniques;

● the forwarding path has controllability and reusability;

● detecting the message is carried and forwarded on the appointed path;

● path detection concerns end-to-end validity;

● the detection message is carried by the normal forwarding message at the path intermediate node.

In order to implement path detection, a detection technology is generally deployed on a path head-to-tail network element with a well-set trend on the network, and a carrying mode of a path service message is multiplexed to forward a detection message, so that the effect of an end-to-end path is achieved by obtaining the state of a detection response message. At present, two methods are mainly adopted:

scheme 1: adopting an IP forwarding bearer detection protocol;

scheme 2: adopting a label forwarding bearing detection protocol;

the path control method of scheme 1 is simple, but currently, the detection technologies that can be deployed in such forwarding paths are all single hops based on a data link layer or a network layer, that is, node network elements do not forward such messages, and only path state detection of a direct next hop between network elements can be realized, and an end-to-end path detection effect through multiple network elements or a next hop cannot be achieved. The path deployment of the scheme 2 is based on a label forwarding VPN technology, the head and tail network elements can be regarded as direct connection, the types of bearable detection protocols are more, but the deployment and the removal of the VPN are more complicated, the requirement on operation and maintenance is higher, and the implementation is not facilitated.

Disclosure of Invention

The invention provides a method for detecting an end-to-end path of a packet access network, which can solve the problem.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting an end-to-end path of a packet access network comprises the following steps:

step 1: utilizing the existing network to establish GRE tunnel between the node network elements to be detected, the tunnel path is the same as the path of the required bearing service; the IP packet forwarding technology is used for realizing the controllability of a forwarding path so as to meet the requirement of a network element node through which the detection path passes;

step 2: the network elements for establishing the GRE tunnel can be mutually regarded as direct connection of the next hop, and the node information of each other is transmitted between GRE interfaces; the GRE tunnel technology based on IP packet forwarding is used, and the condition that the network elements of the head node and the tail node of the detection path are logically directly connected is met;

and step 3: a protocol function (such as CFM) capable of detecting direct connection path detection is configured on a GRE interface created by a network element, so as to achieve the purpose of detecting an end-to-end path. And a link-level detection technology is deployed on a tunnel interface created by the logically directly-connected head-to-tail node network elements so as to achieve the effect of end-to-end path detection.

The invention has the beneficial effects that:

1) the control of the forwarding path can be simply realized by using the traditional IP packet forwarding technology;

2) the deployment of an end-to-end detection path is easier to realize (relative to label forwarding) by using a GRE tunnel technology based on IP packet forwarding;

3) the existing link level detection technology is used for realizing end-to-end path detection on a logically directly connected tunnel interface without carrying out new protocol extension;

4) the intermediate network element node of the detection path only needs to normally forward IP packets without sensing the detection message, and the whole scheme is easy to be compatible with the opened node network element.

Drawings

FIG. 1 is an introduction of a usage scenario in the present invention;

FIG. 2 is a networking implementation of the use scenario of the present invention;

fig. 3 illustrates the principle of packet encapsulation and forwarding in the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

fig. 1 is a typical networking usage scenario of the present invention, where each node network element forms a network by using an IP packet forwarding technique, and it is currently easier to implement link-level detection between two directly connected network element nodes.

Fig. 2 is an extended usage scenario to be satisfied by the present invention, where end-to-end path detection needs to be implemented by multiple intermediate network element nodes, and currently, generally, a path needs to be controlled and deployed in a tunnel manner implemented by a label forwarding technology, and then a detection technology is deployed to implement the path, and in many cases, an existing detection protocol needs to be extended.

As shown in fig. 3, the method for detecting an end-to-end path of a packet access network according to this embodiment includes the following steps:

each node network element in the packet network completes the IP address configuration of the physical link and the direct connection interface;

configuring a management (IP) identifier of a network element node through which a detection path passes;

the management (IP) identifications of the head and tail node network elements can be accessed to each other by a route announcement mode;

the coincidence of the passed network element node and the detection path is realized in a routing control mode;

establishing a GRE tunnel by using management (IP) identification of network elements of head and tail nodes (logically, the head and tail nodes can be regarded as direct connection equipment, and a direct connection interface is an established GRE tunnel interface);

configuring a (direct connection) link detection protocol (such as CFM) on the created tunnel interface;

because the head node network element and the tail node network element are logically direct-connected equipment, the link level detection can be normally initiated;

taking the unidirectional transmission of the detection message as an example, the detection message is transmitted to the next-hop network element after being encapsulated by GRE at the initiating terminal according to the mode of IP packet forwarding;

the next hop (intermediate) node network element does not sense the detection message encapsulated by GRE and normally forwards the detection message according to the IP packet;

the receiving end is used as a tunnel tail node to decapsulate the GRE message and then normally process the detection message, so that the detection message is transmitted by next hop of a plurality of network elements, and the detection effect of an end-to-end path is achieved.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention by those skilled in the art should fall within the protection scope of the present invention without departing from the design spirit of the present invention.

Claims

1. A method for end-to-end path detection in a packet access network, comprising: the method comprises the following steps:

step 1: utilizing the existing network to create GRE tunnel between the network element nodes needing path detection, the tunnel path is the same as the path of the required bearing service; each network element node in the packet network completes the IP address configuration of the physical link and the direct connection interface; configuring a management IP identification of a network element node where a detection path passes; the management IP identifications of the head and tail network element nodes can be accessed to each other in a route notification mode; the coincidence of the passed network element node and the detection path is realized in a routing control mode; establishing a GRE tunnel by using the management IP identification of the head and tail network element nodes;

step 2: network element nodes for establishing the GRE tunnel can be mutually regarded as direct connection of next hop, and node information of each other is transmitted through a GRE interface;

and step 3: configuring a protocol function capable of detecting a direct connection path on a GRE interface created by a network element so as to achieve the detection purpose of an end-to-end path; when the detection message is sent in one direction, the detection message is transmitted to a next hop network element node after being encapsulated by GRE at an initiating end according to an IP packet forwarding mode; the next hop network element node does not sense the detection message encapsulated by GRE and normally forwards and processes the detection message according to IP packets; the receiving end is used as a tunnel tail node to decapsulate the GRE message and then normally process the detection message, so that the detection message is transmitted by the next hop of the network element nodes, and the detection effect of an end-to-end path is achieved.