CN100459573C - Message transmitting method in cable modem terminal system - Google Patents

Abstract

The invention relates to a report transmission method used in the terminal system of cable modem, which is characterized in that: (a), setting the ascending outlet interface for transferring report at the terminal system; (b), the terminal system transfers the ascending report, that sending the report to the ascending outlet interface, and the upper server receives the report and complete the identification charge authorization. With said inventive method, the load of modem terminal system can be reduced, to supply improved access identification charge authorization.

Description

A Message Transmission Method on Cable Modem Termination System

technical field

The invention relates to switching technology, in particular to a message transmission method on a cable modem terminal system.

Background technique

At the current stage of continuous updating of network equipment and rapid development of network technology, the use of hybrid coaxial fiber optic (HFC) access technology is currently a relatively popular access technology. Run the cable-based data service interface specification (DOCSIS) or the European DOCSIS standard (EuroDOCSIS) on the HFC network to provide users with broadband access services. On the HFC network, the link layer technology can be used for user access authentication and authorization.

The Cable Modem Termination System (CMTS) is the equipment between the HFC network and the metropolitan area network. The current user access authentication and authorization is to terminate the Ethernet-based point-to-point protocol (PPPoE) message on the CMTS, and access the authentication and accounting authorization, and then forward it through the upper layer router directly connected to the CMTS. The termination is to extract the useful information in the PPPoE message, send the useful information to the Authentication Accounting Authorization (AAA), and then discard the message. The PPPoE message is terminated on the CMTS, so the CMTS is regarded as the server of the message; after authentication and accounting authorization, it is forwarded through the upper router connected to the CMTS, so the CMTS also undertakes the routing function.

For above-mentioned prior art, following shortcoming is arranged:

1) The CMTS is not a professional server device. The access authentication and billing function of the broadband remote access server (B-RAS) is very powerful. The server function and the access authentication and billing function of the CMTS are far inferior to those of the B-RAS. There will be certain defects;

2) There is one CMTS for a small user group, but there must be several CMTS for a large user group, so one CMTS cannot manage all users uniformly, which increases the complexity of operation and maintenance;

3) The CMTS is not only a Layer 2 bridging device, but also a routing function and a server role. Therefore, the performance of the CMTS is not professional enough, and the equipment is complex, which may affect some of its performance.

To sum up, the main reason for these shortcomings is that PPPoE packets are terminated on the CMTS during access authentication and accounting authorization, so the CMTS is burdened with many functions and affects the overall performance.

Contents of the invention

In view of this, the purpose of the present invention is to provide a message transmission method on the CMTS, so as to perform simple processing on the CMTS, transparently transmit the message, and complete access authentication and charging on the upper layer access server authorized.

For achieving the above object, the present invention provides a kind of message transmission method on the cable modem terminal system, it is characterized in that, this method comprises:

a) Configure an uplink outbound interface for packet forwarding on the cable modem terminal system;

b) The cable modem terminal system forwards the uplink message, forwards the uplink message to the uplink outbound interface according to the uplink outbound interface configured in step a, and the upper layer server receives the uplink message and completes the access authentication and charging authorization.

Wherein, the forwarding of the uplink message in step b further includes: extracting the MAC address and the downlink outbound interface of the user corresponding to the uplink message from the uplink message, and storing them in the forwarding table;

Step b further includes: the cable modem terminal system forwarding the downlink message, according to the destination MAC address in the downlink message, searching for the downlink outbound interface corresponding to the user in the forwarding table, if found, forwarding the downlink message to the corresponding Downlink outbound interface; if not found, the downlink packet will be broadcast to all interfaces.

Wherein, the message is an Ethernet-based point-to-point protocol message in the IPv4 network.

Wherein, the message is an Ethernet-based point-to-point protocol message in the IPv6 network.

Wherein, the method described in step a includes: configuring different uplink outgoing interfaces according to different types of messages;

The method for forwarding the uplink message to the uplink outbound interface in step b includes: the cable modem terminal system judges the type of the uplink message, and forwards the uplink message to the corresponding uplink outbound interface.

Wherein, the method described in step a further includes: configuring the backup interface of the uplink outgoing interface in the cable modem terminal system;

The method for forwarding the uplink message in step b further includes: judging that the configured uplink outbound interface is faulty, and forwarding the uplink message to the backup interface.

Wherein, the method for configuring the backup interface of the uplink outgoing interface described in step a includes: configuring different backup interfaces according to different types of messages;

The method for forwarding the uplink message to the backup interface described in step b includes: the cable modem terminal system judges the type of the uplink message, and forwards the uplink message to the corresponding backup interface.

Wherein, according to the networking situation, when the cable modem terminal system needs to be represented by a different virtual local area network, the method described in step a further includes: configuring the virtual local area network identifier for the cable modem terminal system;

The method described in step b further includes: before forwarding the uplink message, adding the virtual local area network identifier to the message; before forwarding the downlink message, removing the virtual local area network identifier.

Wherein, the method for extracting described in step b further includes: extracting the cable modem identifier of the user corresponding to the uplink message from the uplink message;

The method for storing in the forwarding table described in the step b includes: storing the MAC address, the downstream outgoing interface and the cable modem identification in the forwarding table in a one-to-one correspondence;

The forwarding method of the downlink message described in the step b includes: according to the destination MAC address in the downlink message, look up the downlink outgoing interface and the cable modem identification corresponding to the user from the forwarding table, if found, then according to the cable modem identification Obtain the registration information of the user, and then forward the downlink message to the corresponding downlink outbound interface according to the registration information; if it cannot be found, forward the downlink message to all interfaces in broadcast mode.

Wherein, the method for storing in the forwarding table described in step b includes:

When an uplink packet sent by a user passes through the cable modem terminal system, it is judged whether the downlink outbound interface of the corresponding user has changed. If there is no change, the downlink outbound interface does not need to be stored in the forwarding table again; Stored in the forwarding table, overwriting the original record.

In the present invention, the message is only simply processed on the CMTS, and the message is actually transparently transmitted, and the message is not terminated on the CMTS, so the burden on the CMTS is reduced. The message is transparently transmitted to the access server with powerful functions in the upper layer, terminates on the server, and completes the access authentication and accounting authorization, thus providing users with more perfect access authentication and accounting authorization services, and through the server , can manage users in a unified way and improve the performance of the whole system.

Description of drawings

Figure 1 is a composition diagram of the existing network;

Fig. 2 is the flowchart of CMTS configuration PPPoE message transmission method among the present invention;

Fig. 3 is the flowchart of CMTS forwarding uplink PPPoE message among the present invention;

Fig. 4 is a flowchart of CMTS forwarding downlink PPPoE message in the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, the CMTS is a bridging device between the HFC network and the MAN. The upper layer of the CMTS is connected to the B-RAS, and the B-RAS is connected to the MAN. In the present invention, the message used for access authentication and charging authorization transmitted on the CMTS is a two-layer message (data link layer message), specifically a PPPoE message, and the PPPoE message can be an IPv4 network message. A PPPoE packet can also be a PPPoE packet in an IPv6 network. The following describes in detail the method of processing PPPoE packets on the CMTS to better complete access authentication and accounting authorization.

The general idea of forwarding PPPoE packets on the CMTS is as follows: First, configure the uplink outbound interface for forwarding PPPoE packets on the CMTS; The information corresponding to the user is stored in the forwarding table, and then the uplink PPPoE message is forwarded to the configured uplink outbound interface, and the upper-layer access server B-RAS terminates the PPPoE message to complete the access authentication and accounting authorization; when forwarding When the downlink PPPoE message is used, the forwarding table is searched according to the information in the downlink PPPoE message, and then the downlink PPPoE message is forwarded to the corresponding interface according to the search result.

Figure 2 shows the method for configuring PPPoE packet transmission on the CMTS, and the detailed description is as follows:

Step 201: configure the uplink outgoing interface of the PPPoE message on the CMTS, and its interface is 1/8/1;

Step 202: Configure the backup interface of the above-mentioned uplink outbound interface on the CMTS, and its interface is 1/8/2;

Step 203: according to networking situation, under the situation that CMTS needs to represent with different virtual local area network VLANs, CMTS configures virtual local area network mark (VLAN ID), and this mark can be represented as 112; Under the situation that CMTS does not need to represent with different VLANs, CMTS does not Configure the VLAN ID, which can be represented by 0.

According to the DOCSIS/EuroDOCSIS standard, the CM of the user end registers on the CMTS to which the user belongs, that is, the CM goes online, so that the user accesses the HFC network, and the user is assigned an IP address and the time slot required for physical connection. Users can communicate with the network, that is, users can send packets to the network side, and can also receive packets from the network side. The following describes in detail the method of forwarding PPPoE packets on the CMTS according to the configuration of the above CMTS.

Figure 3 shows the process of processing uplink packets at the CMTS, and the specific description is as follows:

Step 301: The uplink message sent by the user to the network side arrives at the CMTS;

Step 302: The CMTS judges whether the transmission method to the PPPoE message is configured in the CMTS, and when it is judged that the transmission method to the PPPoE message is configured, execute step 303; when it is judged that it is not configured, execute step 304;

Step 303: The CMTS further judges whether the message is a PPPoE message, if yes, then execute step 305; if not, then execute step 304;

Step 304: Process and forward the message by adopting the existing technical solution;

Step 305: Process and forward the PPPoE message to the corresponding uplink outbound interface according to the configuration information of the CMTS;

Step 306: Terminate the PPPoE packet in the B-RAS, and complete access authentication and charging authorization.

According to the above steps, the CMTS transparently transmits the uplink PPPoE message to the upper layer B-RAS for authorization of access authentication and charging, thus avoiding the disadvantages described in the prior art.

In order to forward the downlink PPPoE message conveniently, in step 305, at first need do some processing to this uplink PPPoE message, then forward the uplink PPPoE message to the corresponding uplink outgoing interface, detailed description is as follows:

Learn the user information corresponding to the PPPoE message from the uplink PPPoE message: the MAC address of the PPPoE user, the downlink outbound interface corresponding to the user, the CM ID corresponding to the user, etc., and then store these user information one by one Enter the forwarding table, as shown in Table 1, so that other information of the user can be queried according to the user's MAC address. When a user connects to the network through the CMTS for the first time, user information needs to be registered and stored in the forwarding table; when the user connects to the network through the CMTS again, there is no need to register user information again, unless the user information It has been updated. At this time, you need to re-register to overwrite the original registration information.

The user's MAC address The downlink outbound interface corresponding to the user The CM ID corresponding to the user 0002-0e1f-00c3 1/1/1 112 ... ... ... 00fc-ffdb-10100 1/2/1 7

Table 1

Before the upstream PPPoE message is forwarded, it is also judged whether the CMTS is configured with the VLAN ID as described in step 203, if so, then the VLAN ID is added on the upstream PPPoE message; if not, no processing is done.

Then the uplink PPPoE message is transmitted to the uplink outgoing interface configured in step 201, 1/8/1; Backup interface, 1/8/2.

Figure 4 shows the process of processing downlink packets at the CMTS, and the specific description is as follows:

Step 401: the network side sends a downlink message to the user, and the message reaches the CMTS through the B-RAS;

Step 402: The CMTS judges whether the transmission method to the PPPoE message is configured in the CMTS, and when it is determined that the transmission method to the PPPoE message is configured, step 403 is performed; when it is determined that there is no configuration, step 405 is performed;

Step 403: The CMTS further judges whether the message is a PPPoE message, if yes, then execute step 404; if not, then execute step 405;

Step 404: The CMTS judges whether the PPPoE message arrives at the CMTS from the configured uplink outgoing interface, if yes, then execute step 406; if not, then execute step 405;

Step 405: Process and forward the message by adopting the existing technical solution;

Step 406: forward the PPPoE message according to the information obtained when the uplink PPPoE message is forwarded, specifically described as follows:

If there is a VLAN ID in the downlink PPPoE message, remove the VLAN ID in the downlink PPPoE message.

Obtain the destination MAC address from the downlink PPPoE message, which is 0002-0e1f-00c3. According to the destination MAC address, look up the forwarding table (Table 1) described in the uplink PPPoE message transmission, and find the downlink address of the user corresponding to the destination MAC address. Outbound interface and CM ID.

If it is found from the forwarding table that the downlink outbound interface corresponding to the user is 1/1/1, and the CM ID is 112, the CMTS obtains the registration information of the corresponding CM according to the CM ID 112, and then forwards the downlink PPPoE message to The queried outbound interface 1/1/1; if no user information can be found, the CMTS broadcasts the PPPoE message to all interfaces.

To sum up, the CMTS transparently transmits the PPPoE packets, that is, the PPPoE packets are not terminated on the CMTS, but are transparently transmitted to the upper-layer powerful server for termination, and authorization for access authentication and accounting. Therefore, the server provides a more perfect access authentication, accounting and authorization scheme, and the burden of the CMTS is greatly reduced, and users are also managed uniformly, which improves the performance of the entire network.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1, a kind of message transmitting method on Cable Modem Terminal System is characterized in that, this method comprises:

A) the up outgoing interface that configuration message is transmitted on Cable Modem Terminal System;

B) Cable Modem Terminal System is transmitted uplink message, according to the up outgoing interface that is disposed among the step a, uplink message is forwarded to this up outgoing interface, and the top service device is received this uplink message and finished the access authentication accounting mandate.

2, method according to claim 1 is characterized in that,

The described forwarding uplink message of step b further comprises: from uplink message, extract the MAC Address and the descending outgoing interface of this uplink message institute respective user, deposit in and transmit;

Step b further comprises: Cable Modem Terminal System converting downlink message, according to the target MAC (Media Access Control) address in the downlink message, search in described the transmitting descending outgoing interface that should the user,, then downlink message is forwarded to corresponding descending outgoing interface if find; If search less than, then downlink message is forwarded to total interface with broadcast mode.

3, method according to claim 1 and 2 is characterized in that, described message is the peer-peer protocol message based on Ethernet in the middle of the IPv4 network.

4, method according to claim 1 and 2 is characterized in that, described message is the peer-peer protocol message based on Ethernet in the middle of the IPv6 network.

5, method according to claim 1 is characterized in that,

The described method of step a comprises: according to the type difference of message, dispose different up outgoing interfaces;

The method that the described uplink message of step b is forwarded to this up outgoing interface comprises: Cable Modem Terminal System is judged the type of uplink message, and uplink message is forwarded to corresponding up outgoing interface.

6, method according to claim 1 is characterized in that,

The described method of step a further comprises: at the backup interface of Cable Modem Terminal System collocating uplink outgoing interface;

The method of the described forwarding uplink message of step b further comprises: judge the up outgoing interface fault that is disposed, uplink message is forwarded to backup interface.

7, method according to claim 6 is characterized in that,

The method of the backup interface of the described collocating uplink outgoing interface of step a comprises: according to the type difference of message, dispose different backup interfaces;

The described method that uplink message is forwarded to backup interface of step b comprises: Cable Modem Terminal System is judged the type of uplink message, and uplink message is forwarded to corresponding backup interface.

8, method according to claim 2 is characterized in that,

According to the networking situation, when Cable Modem Terminal System need be represented with different VLANs,

Method described in the step a further comprises: Cable Modem Terminal System configuring virtual LAN sign;

Method described in the step b further comprises: uplink message is added to described VLAN ID in this message before transmitting; Downlink message removes described VLAN ID before transmitting.

9, method according to claim 2 is characterized in that,

The method of extracting described in the step b further comprises: from uplink message, extract the cable modem sign of this uplink message institute respective user;

The method that depositing in described in the step b transmitted comprises: MAC Address, descending outgoing interface and cable modem sign are deposited in correspondingly transmit;

The retransmission method of the downlink message described in the step b comprises: according to the target MAC (Media Access Control) address in the downlink message, from transmit, search the descending outgoing interface and the cable modem sign of this user's correspondence, if find, then obtain this user's log-on message, according to this log-on message downlink message is forwarded to corresponding descending outgoing interface then according to the cable modem sign; If search less than, then downlink message is transmitted to total interface with broadcast mode.

10, method according to claim 2 is characterized in that, the described method of transmitting that deposits in of step b comprises:

When the uplink message of user's transmission passes through this Cable Modem Terminal System, judge whether the descending outgoing interface of respective user changes, if do not change, descending outgoing interface need not deposit this again in and transmit; If change, descending outgoing interface deposits this again in and transmits, and covers original record.

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