CN112887127B

CN112887127B - vBRAS equipment and method for realizing transfer control separation

Info

Publication number: CN112887127B
Application number: CN202110036619.8A
Authority: CN
Inventors: 艾滨
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2022-05-13
Anticipated expiration: 2041-01-12
Also published as: CN112887127A

Abstract

A vBRAS device and method for realizing switching control separation relate to the technical field of communication, the device includes a control surface subsystem, a forwarding surface subsystem and an interface management module, and also includes: a CP proxy module which is opened when the vBRAS device is configured to be in an UP mode and is used for receiving a management command sent by the vBRAS device configured to be in a CP mode when two same vBRAS devices are cascaded; a UP management module which is started when the vBRAS device is configured to be in a CP mode and is used for managing a CP proxy module of the vBRAS device configured to be in the UP mode when two same vBRAS devices are cascaded; and the CP management module is used for configuring the vBRAS equipment into a CP mode or an UP mode and controlling the opening or closing of the CP agent module and the UP management module. The single vBRAS device can realize the centralized function, and the transfer control separated function is realized by cascading two same devices.

Description

vBRAS equipment and method for realizing transfer control separation

Technical Field

The invention relates to the technical field of communication, in particular to vBRAS equipment and a method for realizing transfer control separation.

Background

As an emerging BRAS (Broadband Access Server) device form, the vbars mainly has two architecture modes: centralized control and separate control. The two modes respectively have advantages and disadvantages and a trial scene, the centralized mode is suitable for a miniaturized service scene, and the transfer control separation mode is more suitable for a large-scale access scene.

Centralized type: the centralized mode is to migrate all functions of the conventional BRAS to the vrbras VNF (Virtual Network Feature) of a VM (Virtual Machine), and implement all BRAS capabilities in a single VNF, and the control and forwarding are highly integrated. Although the method can realize the traditional BRAS function with low cost, the method has the defect of limited performance and can not replace the traditional entity BRAS in the high-service-density scene.

The rotary control separated type: in this way, the function of the conventional BRAS is separated into a CP (control plane) and an UP (forwarding plane), and access authentication and protocols consumed by a high CPU (Central Processing Unit) are moved to the cloud, which is the mainstream development trend of the current vbars. The disadvantages of this approach are high cost and limited deployment scenarios.

At present, a service scene connected with a centralized device cannot be directly accessed to a transfer control separated device, so that the conversion between the two modes of the centralized device and the transfer control separated device cannot be realized.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide vBRAS equipment and a method for realizing transfer control separation, wherein a single vBRAS equipment can realize a centralized function, and a transfer control separation type function is realized by cascading two same equipment.

In order to achieve the above object, on one hand, a vbrs device is adopted, which includes a control plane subsystem, a forwarding plane subsystem, and an interface management module, and further includes:

a CP proxy module which is opened when the vBRAS device is configured to be in an UP mode and is used for receiving a management command sent by the vBRAS device configured to be in a CP mode when two same vBRAS devices are cascaded;

a UP management module which is started when the vBRAS device is configured to be in a CP mode and is used for managing a CP proxy module of the vBRAS device configured to be in the UP mode when two same vBRAS devices are cascaded;

and the CP management module is used for configuring the vBRAS equipment into a CP mode or an UP mode and controlling the opening or closing of the CP agent module and the UP management module.

Preferably, the interface management module includes a remote UP interface module, and is configured to receive, when two same vrbs devices are cascaded, a user signaling message received by a vrbras device configured in an UP mode.

Preferably, the interface management module establishes a mapping table, where the mapping table includes a mapping between a bras interface index of the UP mode vbrs device and a bras interface index of the CP mode vbrs device.

Preferably, when two same vrams are cascaded, a transmission channel is established between the UP management module of the vrars device configured in the CP mode and the CP proxy module of the vrars device configured in the UP mode.

Preferably, the transmission channel includes a signaling channel, a configuration channel and a control channel.

In another aspect, a method for implementing transfer control separation based on the vbars device is provided, including:

cascading two vBRAS devices, wherein one is configured to be in a CP mode, and the other is configured to be in an UP mode;

a control plane subsystem of vBRAS equipment configured to be in a CP mode generates a forwarding table item, and an UP management module of the same vBRAS equipment manages a CP agent module of the UP mode vBRAS equipment;

and the CP agent module of the UP mode vBRAS equipment controls a forwarding plane subsystem of the same vBRAS equipment to be responsible for forwarding the user service message.

Preferably, the interface management module is internally provided with a remote UP interface module and establishes a mapping table, where the mapping table includes mapping between a bras interface index of the UP mode vbrs device and a bras interface index of the CP mode vbrs device.

Preferably, the interface management module of the UP mode vbrs device reports the user signaling message to the remote IP interface module of the CP mode vbrs device, the interface management module of the CP mode vbrs device transmits the user signaling message to the control plane subsystem through the forwarding plane subsystem of the vbrs device, and the control plane subsystem performs protocol processing for authentication and allocates an address.

Preferably, configuring the vbars device to the CP mode includes:

and the CP management module starts a control plane subsystem, a forwarding plane subsystem and an interface management module of the located vBRAS equipment, configures the address information of the UP management module of the located vBRAS equipment and waits for the access of the UP mode vBRAS equipment.

Preferably, configuring the vbars device in UP mode comprises:

and the CP management module starts a forwarding plane subsystem, a CP proxy module and an interface management module of the vBRAS equipment, and closes the control plane subsystem and the UP management module.

The technical scheme has the following beneficial effects:

the CP management module, the CP proxy module and the UP management module are added to the vBRAS device, when the vBRAS device is independently arranged, the CP proxy module can be controlled to be in a closed state through the CP management module on the basis of starting the control plane subsystem, the forwarding plane subsystem and the interface management module, and the centralized function of the vBRAS device is achieved.

When two same vBRAS devices are cascaded, a control channel is established between an UP management module of the vBRAS device configured as the CP mode and a CP proxy module of the vBRAS device configured as the UP mode, the vBRAS device configured as the CP mode issues a management command to the vBRAS device configured as the UP mode through the control channel, and the vBRAS device configured as the UP mode is responsible for forwarding a user service message, so that a transfer control separation function is realized.

The invention can realize the deployment of two functions based on the same vBRAS equipment, and the switching of two function modes can be realized based on one set of software system, thus being applicable to different deployment scenes.

Drawings

Fig. 1 is a schematic diagram of a vbars apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a cascade of two vbars devices according to an embodiment of the present invention;

FIG. 3 is a flow chart of an embodiment of the present invention configured in CP mode;

FIG. 4 is a flow chart of an embodiment of the present invention configured in an UP mode;

FIG. 5 is a flow chart of CP/UP mode switching according to an embodiment of the present invention.

Reference numerals:

1-control plane subsystem, 2-forwarding plane subsystem, 3-interface management module, 30-remote end

The system comprises a UP interface module, a 4-CP management module, a 5-CP agent module and a 6-UP management module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, an embodiment of a vbars device is provided. The vbars equipment of the embodiment is separately arranged, so that a centralized function can be realized; after two same vBRAS devices are cascaded, a transfer control separated function can be realized. And two same vBRAS devices are cascaded, one vBRAS device is configured to be in a CP mode, and the other vBRAS device is configured to be in an UP mode.

In this embodiment, the vbrs device includes a control plane subsystem 1, a forwarding plane subsystem 2, and an interface management module 3 in a conventional vbrs device, and further includes a CP management module 4, a CP proxy module 5, and an UP management module 6.

The control plane subsystem 1 is responsible for Protocol processing and Authentication of a User signaling message, and includes an AAA module, a DHCP (Dynamic Host Configuration Protocol) module, an ipoe (ip over ethernet) access control module, a pppoe (Point to Point Protocol over ethernet) access control module, an radius (remote Authentication digital In User service) Authentication module, and a User domain management module.

The forwarding plane subsystem 2 is responsible for route calculation and forwarding of Service traffic, and includes OSPF (Open short Path First)/MPLS (Multi-Protocol Label Switching)/ISIS (link state routing Protocol)/BGP (Border Gateway Protocol)/static routing module, multicast module (IGMP/PIM), ACL (Access Control Lists), QoS (Quality of Service) module, and soft forwarding engine.

And a CP management module (CP _ MGR)4, configured to manage and switch the mode of the vbrs device, including configuring the vbrs device to be in CP mode or UP mode. Specifically, the UP management module is used for managing the opening or closing of the control plane subsystem 1, the forwarding plane subsystem 2, the CP proxy module 5 and the UP management module 6.

A CP proxy module (CP _ AGENT)5, which is turned on when a vcrs device is configured in UP mode, is configured to receive a management command issued by a vcrs device configured in CP mode when two identical vcrs are cascaded. Specifically, the management command to the vbars device in UP mode is issued by the vbars device in CP mode, and is proxied to the vbars device in UP mode.

An UP management module (UP _ MGR)6, which is turned on when a vcrs device is configured in CP mode, is used to manage a CP proxy module of a vcrs device configured in UP mode, i.e. to manage UP objects of a vcrs device in UP mode, when two same vcrs are cascaded.

Preferably, the UP management module 6 is also used to establish and maintain a transmission channel between two vbars devices of the cascade. The transmission channel comprises a signaling channel, a configuration channel and a control channel.

The interface management module (IF _ MGR)3 includes a remote UP interface module (UP _ IF _ MGR)30 inside, and the remote UP interface module 30 is configured to receive a user signaling message received by a vbrs device configured in an UP mode when two same vbrs devices are cascaded.

In this embodiment, the interface management module 3 establishes a mapping table, where the mapping table includes a mapping between a bras interface index (index) of the UP mode vbrs device and a bras interface index (index) of the CP mode vbrs device.

Based on the above embodiments, an embodiment is provided for configuring a vbrs device to implement a centralized function. In this embodiment, the vbrs device needs to be configured to be in a CP mode, and the CP management module 4 starts the control plane subsystem 1, the forwarding plane subsystem 2, the UP management module 6, and the interface management module 3; the CP proxy module 5 is in the off state. And after the UP management module 6 is started, the device is actually in a suspended state, and can wait for access of the vbrs device in the UP mode.

At this time, the vbrs device operates in a standard BRAS mode, and an implementation mode for implementing a centralized function is as follows: after receiving the PPPOE/IPOE service packet at the bras interface, the local forwarding plane subsystem 2 uploads the PPPOE/IPOE service packet to the control plane subsystem 1 for protocol processing, thereby completing operations such as access authentication and authorization of the user signaling packet, address allocation, and the like. The control plane subsystem 1 generates a forwarding table entry, and forwards the user service through the forwarding plane subsystem 2.

Based on the vbars device in the above embodiment, an embodiment of a method for implementing transfer control separation is provided. As shown in fig. 2, two vbrs devices are cascaded, wherein one vbrs device is configured in CP mode and the other vbrs device is configured in UP mode. A vxlan tunnel is formed between the interface management module 3 of the CP mode vrbras device and the interface management module 3 of the UP mode vrbras device, and a transmission channel is established between the UP management module 6 of the CP mode vrbras device and the CP proxy module 5 of the UP mode vrbras device.

As shown in fig. 3, the step of configuring the vbrs device in the CP mode, where the vbrs device in the CP mode is used as a home terminal device, specifically includes:

s201, starting a control surface subsystem 1 by a CP management module 4;

s202, the CP management module 4 starts the forwarding surface subsystem 2;

s203, the CP management module 4 starts the UP management module 6;

s204, the CP management module 4 senses and is connected to a remote UP mode vBRAS device;

s205, managing the vbrs interface on the remote UP mode vbrs device through the UP management module 6.

In step S203, the CP management module 4 configures the address information of the UP management module 6, and waits for the joining of the UP mode vrams.

As shown in fig. 4, the step of configuring the another vbrs device to be in the UP mode specifically includes:

s301, turning off the control surface subsystem 1;

s302, starting a forwarding surface subsystem 2;

s303, starting a CP agent module 5;

s304, connecting a CP mode vBRAS device;

and S305, reporting the signaling to the CP mode vBRAS equipment, receiving a control command of the CP mode vBRAS equipment, and forwarding a user service message.

In the UP mode vbrs device the UP management module 6 is also switched off.

As shown in fig. 2, the UP mode vbrs device initiates a connection to the CP mode vbrs device, and after the connection is established through a handshake connection protocol between UP and CP, the interface management module 3 of the UP mode vbrs device reports its bras interface tag to the interface management module 3 of the CP mode vbrs device. The interface management module 3 creates a mapping table, which includes the mapping of the bras interface index of the UP mode vbrs device and the bras interface index of the CP mode vbrs device. Specifically, the UP mode vbrs sends a user signaling message to the remote UP interface module 30 of the CP mode vbrs, where the user signaling message carries its bras interface index, and is mapped to the bras interface index of the CP mode vbrs in the remote UP interface module 30.

When the bras interface of the UP mode vrabs equipment receives the user signaling message, the user signaling message is reported to the remote UP interface module 30 of the CP mode vrabs equipment through the vxlan tunnel, and the user signaling message is transmitted to the control plane subsystem 1 through the forwarding plane subsystem 2, and the protocol processing of authentication is performed and the address is allocated.

When a user service message needs to be sent, a control plane subsystem 1 of the CP mode vbrs generates a forwarding table entry, an UP management module 6 of the CP mode vbrs filters out a control message which needs to be sent to the UP mode vbrs, the control message is sent to a CP agent module 5 of the UP mode vbrs through a transmission channel, and the CP agent module 5 forwards the user service message through the forwarding plane subsystem 2, so that a control and forwarding separation function is realized.

Based on the above embodiments, an embodiment is provided in which switching between the centralized and the rotation hole separation modes is performed. As shown in fig. 5, with the vbars apparatus, switching between the centralized function and the diversion hole separation function can be achieved without changing the existing system, including the steps of:

s401, for the required function, carrying out mode switching operation of vBRAS equipment;

s402, clearing all current service configurations by the vBRAS equipment, and storing the mode configurations;

and S403, restarting the whole system, and enabling the new mode to take effect.

According to the embodiment, deployment of two functions is realized based on the same vBRAS equipment, in a centralized function environment, the same vBRAS equipment in cascade connection can be converted into a rotary hole separated function, and after service configuration is cleared and the vBRAS equipment is restarted, the function can be switched into the centralized function, requirements of different scenes are flexibly met, and implementation cost is reduced.

The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims

1. A vBRAS equipment, including control plane subsystem, transmit the face subsystem and interface management module, characterized by, still include:

the CP management module is used for configuring the vBRAS equipment into a CP mode or a UP mode and controlling the opening or closing of the CP agent module and the UP management module;

the interface management module establishes a mapping table, wherein the mapping table comprises mapping of bras interface indexes of UP mode vBRAS equipment and bras interface indexes of CP mode vBRAS equipment.

2. The vbrs device of claim 1, wherein said interface management module comprises a remote UP interface module configured to receive a user signaling packet received by a vbrs device configured in an UP mode when two same vbrs devices are cascaded.

3. The vbrs device of claim 1, wherein when two identical vbrs devices are cascaded, a transport channel is established between an UP management module of the vbrs device configured in CP mode and a CP proxy module of the vbrs device configured in UP mode.

4. The vbars device of claim 3, wherein the transmission channel comprises a signaling channel, a configuration channel, and a control channel.

5. A method for implementing transfer control separation based on the vbars apparatus of claim 1, comprising:

a CP agent module of the UP mode vBRAS equipment controls a forwarding plane subsystem of the same vBRAS equipment to be responsible for forwarding a user service message;

the method comprises the steps that a remote UP interface module is arranged in an interface management module, and a mapping table is established, wherein the mapping table comprises mapping of bras interface indexes of UP mode vBRAS equipment and bras interface indexes of CP mode vBRAS equipment.

6. The method for implementing transfer control separation of a vbrs device according to claim 5, wherein an interface management module of the UP mode vbrs device reports a user signaling message to a remote IP interface module of the CP mode vbrs device, and the interface management module of the CP mode vbrs device transmits the user signaling message to a control plane subsystem through a forwarding plane subsystem of the vbrs device, and the control plane subsystem performs protocol processing for authentication and allocates an address.

7. The method of claim 5, wherein configuring the vBRAS device into the CP mode comprises:

the CP management module starts a control plane subsystem, a forwarding plane subsystem and an interface management module of the vBRAS device, configures the address information of the UP management module of the vBRAS device and waits for the access of the UP mode vBRAS device.

8. The method of implementing steering separation for a vBRAS device as recited in claim 5, wherein configuring the vBRAS device to an UP mode comprises: