WO2005101948A1

WO2005101948A1 - A method for routing the concourse service

Info

Publication number: WO2005101948A1
Application number: PCT/CN2005/000559
Authority: WO
Inventors: Jianfei He; Jianyun Zhu; Zhangzhen Jiang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-04-23
Filing date: 2005-04-22
Publication date: 2005-11-03
Also published as: CN1691635A; CN100531113C

Abstract

The invention discloses a method for routing the concourse service, which configures a node which make it have multi access ports, one trunk port and an access/concourse group for achieving the character information fields of the character information value from the data packet; and according to the access/concourse group establishes an character information table which takes the character information value and the access port number as items. The method further comprises: in access/concourse group the access port that receives data packets, achieves the character information value corresponding to character information field from the data packet, and takes the character information value as index to search for the character information table; if it doesn't find a corresponding item, it establishes an item comprising the character information value and the access port number, then it transmits the data packet to the trunk port; if it finds a corresponding item, it transmits the data packet to the trunk port when its access port number and the access port number in the item are same; and when the above two number are not same it updates the access port number in the item with the access port number, then it transmits the data packet to the trunk port.

Description

TECHNICAL FIELD

The present invention relates to aggregation services, and in particular, to a routing method for aggregation services. Background of the invention

At present, the proportion of data services in communication networks is increasing, and most of these services are online services. From the perspective of business flows, the Internet access service is an aggregation service. According to the direction of services and flows, aggregation services include two types: one is the aggregation of service flows from several user network interfaces (UNI) to one network and network interface (NNI), which are mainly used for access nodes in the network; the other One is the aggregation of service flows from several I to one UNI, which is mainly used for the convergence nodes in the network. Here U I mainly refers to the port where the network is connected to user equipment, and NNI refers to the port where the network is connected to other network equipment. For example, when a synchronous digital series (SDH) device is used to transmit Ethernet services, for an SDH device, the Ethernet port is usually UNI and the SDH line interface is NNI.

Generally speaking, user service flow authentication and billing are required for online services. Authentication. The basis can be different values of some information fields in the service flow data packet. Some information fields in a data packet are hereinafter referred to as characteristic information fields, such as a virtual local area network (VLAN) tag, a multi-protocol label switching (MPLS) tag, a media access control (MAC) address, a network protocol (IP) address, etc., can be used as characteristics. Information field. The value of the feature information field is called. Feature information value, and different feature information values represent different user service flows.

A service aggregation mechanism generally used in the prior art is to configure a route based on each characteristic information value in an access node or an aggregation node. Take the aggregation of service flows from the UI to the NNI, and the feature information field is a VLAN tag as an example. In order to achieve service aggregation, a VLAN tag (VLAN ID, VID for short) corresponding to the UNI service flow needs to be configured on each UNT, At the same time, it is also necessary to configure a corresponding VID on the NNI to pass the NI service flow. When the UM receives the service flow, it obtains the VID in the service flow, and then compares the obtained VID with the VID configured on the UNI to pass the service flow in advance and the VID configured on the NNI to pass the service flow. Determine whether to forward to NNI.

As shown in Figure 1, the VIDs of service flows to be passed through U I1 are configured on UNI1, which are 2, 3, and 4; the VIDs of service flows to be passed through UNI2 are configured on UNI2, which are 5, 6, and 7, respectively; The VIDs of all service flows to be passed through the NI are configured as 2, 3, 4, 5, 6, and 7, respectively. In this way, when UNI1 receives the service flow VID of 2, 3, or 4, it forwards the service flow to the NNI; when UNI2 receives the service flow VID of 5, 6, or 7, it also forwards the service flow to the NNI; if UNI1 The received service flow VID is not 2, 3, or 4, or if the service flow VID received by UNI2 is not 5, 6, or 7, the service flow is regarded as illegal data and the service flow is discarded. If the service flow VIDs pre-configured on the NI to pass through the NNI are 2, 4, 6, and 7, then when the service flow VID received by UNI1 is 3, or the service flow VID received by UNI2 is 5, these service flows It will not be forwarded to this NI, but will treat the business flow as illegal data and discard the business flow. Therefore, the VID to be passed through the service flow must be configured on the UNI and the NNI in advance, and the VID to be passed through the service flow configured on the UNI must correspond to the VID to be passed through the service flow configured on the NNI, so that the service can be realized. Convergence. The same is true for the convergence of service flows from NNI to UNI.

It can be seen that when there are a large number of different user service flows, if the existing technology 'convergence mechanism is used, a large number of different VIDs need to be used to represent different user service flows. For example, if there are 4K VLANs, 4K is required. Each VID indicates the user service flow of these 4K VLANs. It is also necessary to configure 4K VIDs to pass through the service flow on the port of the access node or the aggregation node. At this time, the workload of network configuration management is very large. In addition, if the feature information value is changed on the user side, corresponding changes need to be made on the device side, so the subsequent maintenance workload will also be large. Summary of the invention

It can be seen from the above analysis that the main object of the present invention is to provide a routing method for aggregated services, so that it does not need to configure specific feature information values of the feature information fields to achieve service convergence, and reduce the workload of network configuration management. Can reduce the workload of subsequent maintenance.

To achieve the above object, the technical solution of the present invention is implemented as follows:

The present invention provides a method for routing an aggregation service. The method is for an aggregation service node to set an access / aggregation group including multiple access ports, an aggregation port, and a characteristic information field; corresponding to the establishment of the access / aggregation group. A feature information table, where the feature information table uses feature information values and corresponding access port numbers as entries; the method further includes the following steps:

a. An access port in the access / aggregation group that receives a service flow data packet, obtains a characteristic information value from the data packet according to a characteristic information field in the access / aggregation group, and sets the characteristic information value Searching the feature information table as an index;

b. If no entry containing the feature information value is retrieved, an entry containing the feature information value and the access port number entered this time is created in the feature information table, and then the data packet is forwarded to all The aggregation port in the access / aggregation group; if an entry containing the characteristic information value is retrieved, when the access port number in the entry is the same as the access port number entered this time, the data packet Forwarding to the aggregation port, when the access port number in the entry is different from the access port number entered this time, rewriting the access port number of the entry to the access port number entered this time, The data packet is forwarded to the aggregation port.

Wherein, the feature information table is initially set as an empty table.

In step b of the foregoing solution, when the access port number in the entry is different from the access port number entered this time, it may further include: judging whether the protection status attribute of the access port in the entry is protected If yes, the data packet is discarded; otherwise, performing the rewriting of the access port number of the entry to the access port number entered this time and forwarding the data packet to the aggregation port. In step a, before using the feature information value as an index to retrieve the feature information table, the method may further include: determining whether the feature information value is a broadcast type feature information value, and if so, directly forwarding the data packet to all Otherwise, the feature information value is used as an index to retrieve the feature information table.

In step b, the establishment of the entry may further include: configuring the aging feature of the entry according to the aging feature of the access port input this time; if the entry has the aging feature, starting an aging timer for the entry start the timer;

If before the entry aging time arrives, data containing characteristic information values of the entry is received from the access port corresponding to the entry port number of the entry, the aging timer is stopped, and the aging timer is expired. Re-count after initialization; otherwise, when the aging time of the entry reaches, the aging timer stops counting and deletes the entry.

In step b, when the access port number in the entry is the same as the access port number entered this time, the method may further include: judging whether the entry has aging characteristics, and if the entry has aging characteristics, The aging timer corresponding to this entry is initialized; otherwise, it is not processed.

In step b, after the access port number of the entry is changed to the access port number entered this time, it may further include: updating the aging feature of the entry according to the aging characteristics of the access port entered this time; If the input access port has an aging feature, start an aging timer for the entry containing the access port number to start counting;

In addition, the method may further include: after receiving a data packet at the aggregation port in the access / aggregation group, obtaining a characteristic information field in the access / aggregation group in the data packet The feature information value is used as an index to retrieve the feature information table. If no entry containing the feature information value is retrieved, the data packet is dropped or sent to all accesses in the access / aggregation group. Inbound port broadcast; if an entry containing the characteristic information value is retrieved, the data packet is forwarded to the corresponding access port according to the entry port number of the entry.

Before the convergence port uses the feature information value as an index to retrieve the feature information table, the method may further include: determining whether the feature information value is a broadcast type feature information value, and if so, directly forwarding the data packet to All access ports; otherwise, the feature information value is used as an index to retrieve the feature information table.

In the above solution, the characteristic information field may be a VLAN tag, or an MPLS tag, or a MAC address, or an IP address.

As can be seen from the above solution, the key of the present invention lies in: configuring a simple port aggregation relationship and a feature information field for determining a feature information value in an extracted data packet by configuring an access / aggregation group, and providing the configured access The aggregation group establishes a corresponding feature information table, and the access port extracts the characteristic information value of the received packet according to the specified feature information field, and forwards the service flow to the aggregation port according to the configured port aggregation relationship and feature information table. Business convergence. Therefore, the aggregation service routing method provided by the present invention does not need to configure specific feature information values of the feature information field in advance, and only needs to configure a simple port aggregation relationship and determine feature information for extracting feature information values in a data packet. Field, the access port forwards service flow data packets according to the entries in the feature information table, thereby simplifying the management of feature information values and reducing the workload of network configuration management. In addition, when the user-side characteristic information value changes, the access port can automatically adapt to the change of the user-side characteristic information value to forward the service flow, which reduces the workload of subsequent maintenance. Brief description of the drawings

FIG. 1 is a schematic diagram of a configuration method of service aggregation through a VLAN in the prior art; FIG. FIG. 2 is a schematic diagram of an access port and an aggregation port model;

FIG. 3 is a flowchart of a routing method for an aggregation service according to the present invention. Mode of Carrying Out the Invention

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

The main idea of the present invention is: by configuring an access / aggregation group to configure a port aggregation relationship and defining a feature information field for extracting feature information values, and establishing a corresponding feature information table for the configured access / aggregation group, access The ingress port extracts the characteristic information value of the received data packet according to the specified characteristic information field, and forwards the service flow data packet to the aggregation port according to the configured port aggregation relationship and characteristic information table to implement service aggregation.

Since the present invention has the same convergence effect for the two network instances where service flows are aggregated from UNI to NNI and from NNI to UNI, the following does not distinguish between UNI and I, only the access port and the aggregation port are described. Show. The model includes one aggregation port and multiple access ports. Among them, the access port receives service flows, and forwards the service flows to the aggregation port or directly discards them according to certain judgment principles. The aggregation port receives the service flows, and The judgment principle is to forward the service flow to the corresponding access port, or broadcast or discard it to all access ports.

Based on the model shown in FIG. 2, the present invention specifically includes a configuration process of an access / aggregation group and a service process. The configuration process of the access / aggregation group is to configure a simple port aggregation relationship and a characteristic information field for user service flow authentication. That is, the access / aggregation group includes: a characteristic information field for authentication, multiple access ports, and an aggregation port. The function of configuring the characteristic information field in the access / aggregation group is to: The node extracts the characteristic information value of the characteristic information field from the received data packet according to the characteristic information field. In addition, the attributes of the access port include protection status and aging characteristics. In the present invention, multiple access / aggregation groups may be configured for the aggregation service node according to different characteristic information fields. Business office The management process is to establish a correspondence table between the characteristic information value and the access port number based on the configured access / aggregation group, and then realize the automatic routing of the aggregation service according to the correspondence table.

First, configure an access / aggregation group (Group) for the aggregation service node, including:

(1) Configure a feature information field used by the access / aggregation group for user service flow authentication. As described above, the aggregation service node will extract the feature information field of the feature information field from the received data packet according to the feature information field. The characteristic information field may correspond to any one or more pieces of data in the data packet, and the pieces of data may be continuous or discontinuous. Preferably, the characteristic information field may be an MPLS label, a VLAN label, a MAC address, an IP address, or the like.

(2) Add a specific port as an access port to the access / aggregation group, set the protection status and aging characteristics of the access port, and assign a mutually exclusive port number to each access port. Among them, the protection status and aging characteristics of the access port may adopt default settings. The default setting of the protection status of the access port is determined according to the network information security requirements of each access port. If the security requirements are high, set the access port to be protected; otherwise, set the access port to be unprotected; whether the access port is aged is determined by the connection state between the access port and the node. If the access port is disconnected from the node, then The access port is old. Therefore, the aging characteristics of access ports are generally set to have aging characteristics by default.

(3) Add a specific port as an aggregation port to the access / aggregation group.

Secondly, corresponding to the access / aggregation group, a correspondence table between feature information values and access port numbers is established, hereinafter referred to as a feature information table (InfoTable). That is, the feature information table uses the feature information value and the corresponding access port number as entries. The content of the feature information table in the initial state is empty, that is, the entries in the feature information table are automatically configured during the processing of the service.

The attributes of the feature information table include: feature information value, access port number, and aging characteristics of entries. The aging characteristic of the entry is set according to the aging characteristic of the access port. The entry's aging characteristic means that if no entry containing an entry is received from an access port within a preset time, If the data of the characteristic information indicates that the entry is aging, the entry is deleted. Therefore, an aging timer is usually required for each entry to time whether the entry is aging. That is to say, if an entry has aging characteristics, an aging timer is started to start counting after the entry is established; if the feature information value of the entry is received from an access port within a preset time, Data, the aging timer stops counting and restarts after the aging timer is initialized; otherwise, when the aging timer reaches a preset time, the aging timer stops counting, and the entry is deleted. In this embodiment, the preset time may be referred to as the aging time of the entry, and the aging time of the entry is equal to the aging time of the access port of the entry.

In this embodiment, the aging timer is a counter that decreases with time. The count value of the counter starts to decrease after the entry is established. When the count value decreases to 0, it means that 'the entry has aged, the The entry is deleted. In this way, the entries in the feature information table can be updated automatically and timely when the network is re-arranged to save the entry storage space.

The following is the business process of an access / aggregation group.

As shown in FIG. 3, the process of service aggregation based on the characteristic information table includes the following steps: Step 300: The access port receives a data packet, and obtains the characteristic information value of the characteristic information field specified by the access / convergence group in the data packet. .

Step 301: Use the feature information value as an index to retrieve a feature information table.

Step 302: Determine whether there is an entry containing the characteristic information value in the feature information table, and if not, perform step 303; otherwise, perform step 304.

Step 303 is performed. The feature information value is bound to the input port input this time, added as a new entry to the feature information table, and the data packet is forwarded to the convergence terminal π.

Step 304: Determine whether the access port number in the entry is the same as the access port number entered this time. If they are not the same, go to step 305; if they are the same, go to step 308.

Step 305: Determine whether the protection status attribute of the access port in the entry is protected, If there is no protection, step 306 is performed: write the access port number entered this time as the access port number of the entry containing the characteristic information value into the characteristic information table, overwrite the original access port number, and send the data packet Forward to the aggregation port; if there is protection, go to step 307: the data packet is illegal data, and discard the data packet.

Step 308: Forward the data packet to the aggregation port, and then execute step 309.

Step 309: Determine whether the entry has aging characteristics. If the entry has aging characteristics, execute step 310: initialize the aging timer corresponding to the entry; if the entry does not have aging characteristics, proceed to step 311: The entry is not processed. Initializing the aging timer means resetting the count value in the aging timer to a preset value, and then counting down from the preset value again.

When an entry is added or modified in the feature information table, the aging feature of the entry is configured or updated according to the aging feature of the access port of the entry. If the entry has the aging feature, the table is updated. The corresponding aging timer is initialized.

In addition, when a data packet is received from the aggregation port, the characteristic information value of the characteristic information field specified by the access / convergence group in the data packet is acquired; the characteristic information value is used as an index to retrieve the characteristic information table, and if no This entry can have two optional operations: Drop the data packet or broadcast it to all corresponding access ports. The specific operation usually depends on the requirements of information security. For networks with high information requirements, a discarding policy is used. A broadcast strategy is adopted for a network with low information requirements; if the entry is retrieved, the data packet is forwarded to the corresponding access port according to the entry port number of the entry.

Here is a specific example to illustrate.

For example, first configure an access / aggregation group Group1. Groupl includes aggregation port U, access ports A, B, C, D, E, and F, and the feature information field is a VLAN tag. In this embodiment, the default settings of the protection status and aging characteristics of the access ports, B, C, D, E, and F are shown in Table 1: Access port number ABCDEF

Port protection status No Yes No No Yes No No Port aging characteristics Yes Yes Yes Yes Yes Yes

Table 1

Then, an empty feature information table InfoTablel is created for Groupl. The entries in the feature information table InfoTablel are automatically configured during the business process. Assume that the correspondence between the characteristic information value (VID) of the data packets to be received by the six access ports and the access port number is shown in Table 2.

Table 2

Before the first data packet is received, InfoTablel is empty, and the VIDs of the first six data packets in Table 2 are different. Therefore, when the data packets are received from the six access ports, the six The VID is bound to the corresponding input access port number, added as an entry to the feature information table, and forwards the corresponding data packet to the aggregation port U. The aging characteristics of these entries are consistent with the aging characteristics of the access ports.

Therefore, after the first six data packets are received by the access port, the characteristic information table InfoTablel is shown in Table 3.

table 3

When access port B receives data packet 7 with VID 1, it obtains VID 1 and retrieves InfoTablel according to the VID. This entry is retrieved, and the access port number in the entry is A is different from the current access port number B. At the same time, it is found that the access port A is not protected, then the access port number B is overwritten to the access port number A, and the data packet 7 is forwarded to the aggregation port U.

When the access port D receives a data packet 8 with a VID of 4, it obtains a VID of 4, and retrieves InfoTablel according to the VID. This entry is retrieved, and the access port number 'D in the entry is connected to the current connection. If the incoming port number D is the same, the data packet 8 is forwarded to the aggregation port U. At the same time, because the entry has aging characteristics, the aging timer corresponding to the entry with the VID 4 is initialized.

When access port E receives data packet 9 with VID 2, it obtains VID 2 and 'retrieves InfoTablel according to the VID, retrieves this entry, and the access port number B in the entry is connected to this connection. The incoming port number E is different, and at the same time, it is found that the access port B is protected, then the data packet 9 is dropped.

In this way, after the access port receives 9 data packets, the characteristic information table InfoTablel is shown in Table 4:

Table 4

It can be seen that the present invention does not need to configure specific feature information values, as long as a single port aggregation relationship is configured, automatic service aggregation can be achieved, reducing the workload of network configuration management, and the access port can automatically adapt to user-side feature information values. Changes, reducing the workload of subsequent maintenance.

For some specific feature information fields, such as MAC addresses, broadcast type feature information values can be set. When a data packet with broadcast type feature information values is received from an access port, it is The data packet is forwarded to the aggregation port; when a data packet with broadcast type characteristic information values is received from the aggregation port, the data packet is not checked through the table Forward to all access ports.

In short, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall include Within the scope of the present invention.

Claims

Claim

1. A method for routing an aggregation service, comprising: configuring an access / aggregation group including a plurality of access ports, an aggregation port, and feature information fields for an aggregation service node; corresponding to the establishment of the access / aggregation group A feature information table, wherein the feature information table uses feature information values and corresponding access port numbers as entries; the method further includes the following steps:

2. The method according to claim 1, wherein the characteristic information table is initially set to an empty table.

3. The method according to claim 1, wherein in step b, when the access port number in the entry is different from the access port number entered this time, further comprising: judging the entry Whether the protection status attribute of the access port is protected, and if so, the packet is discarded; otherwise, the access port number of the entry is rewritten into the access port number entered this time and described The data packet is forwarded to the aggregation port.

4. The method according to claim 1, characterized in that, in step a, before the retrieving the feature information table using the feature information value as an index, the method further comprises: judging Whether the feature information value is a broadcast type feature information value, and if so, directly forward the data packet to the aggregation port; otherwise, execute the feature information value as an index to retrieve a feature information table.

5. The method according to claim 1, characterized in that, in step b, the establishment of the entry further comprises: configuring the table according to the aging characteristics of the access port input this time. The aging characteristics of the entry; if the table If the entry has aging characteristics, an aging timer is started for the entry to start counting;

If before the entry aging time arrives, data containing the characteristic information value of the entry is received from the access port corresponding to the entry port number of the entry, the aging timer is stopped and stopped, and the aging is performed. The timer restarts after the timer is initialized; otherwise, when the aging time of the entry reaches, the aging timer stops counting and deletes the entry.

6. The method according to claim 5, characterized in that in step b, when the access port number in the entry is the same as the access port number entered this time, the method further comprises: judging the table Whether the entry has aging characteristics. If the entry has aging characteristics, initialize the aging timer corresponding to the entry; otherwise, no processing is performed.

7. The method according to claim 5, characterized in that, in step b, after the access port number of the entry is changed to the access port number entered this time, further comprising: The aging characteristics of the port update the aging characteristics of the entry; if the input access port has aging characteristics, start an aging timer for the entry containing the access port number to start counting;

If before the entry aging time arrives, data containing characteristic information values of the entry is received from the access port corresponding to the entry port number of the entry, the aging timer stops counting, and the aging timer The timer re-counts after initialization; otherwise, when the aging time of the entry reaches, the aging timer stops counting and deletes the entry.

8. The method according to claim 1, further comprising: Including: after receiving the data packet, the convergence port in the access / aggregation group obtains the feature information value of the feature information field in the access / aggregation group in the data packet; and uses the feature information value as an index to retrieve the feature Information table, if no entry containing the characteristic information value is retrieved, the data packet is dropped or broadcast to all access ports in the access / aggregation group; if an entry containing the characteristic information value is retrieved , The data packet is forwarded to the corresponding access port according to the access port number of the entry.

9. The method according to claim 8, wherein before the aggregation port searches the feature information table using the feature information value as an index, the method further comprises: determining whether the feature information value is a broadcast type feature information value. If yes, the data packet is directly forwarded to all access ports; otherwise, the feature information value is used as an index to retrieve the feature information table.

10. The method according to claim 1 or 8, wherein the characteristic information field is a virtual local area network VLAN tag, or a multi-protocol label switching MPLS tag, or a media access control MAC address, or a network protocol IP address.