CN101645880A - Method and device for forwarding data frame based on line bundle - Google Patents

Abstract

The invention embodiment discloses a method and a device for forwarding a data frame based on line bundle. The method for forwarding the data frame based on line bundle comprises the following steps:acquiring a first data frame transmitted by a user side or a network side; dividing the first data frame when the first data frame is greater than the maximum transmission unit MTU of any access linebundled to the user, wherein the sub data frames obtained from division are all less than or equal to the MTU; adding logical identifiers corresponding to the access line bundled to the user to the sub data frames; and transmitting a second data frame comprising the sub data frames and the logical identifiers of the sub data frames so that the data frame can be reformed after being received at anopposite end. The method and the device for forwarding the data frame based on the line bundle increase the bandwidth of the access line, prolong the transmission distance and improve the transmissionreliability on the basis of ensuring the transmission quality of the access line.

Description

Data frame forwarding method and device based on line bundling

technical field

The embodiments of the present invention relate to the technical field of communications, and in particular to a data frame forwarding method and device based on line bonding.

Background technique

Traditional user broadband access lines often use xDSL (Digital Subscriber Line, digital subscriber line), which is characterized by narrow line bandwidth and users are far away from the central office. With the emergence of new services and the expansion of user business scale, users need higher bandwidth, but the bandwidth provided by traditional access methods cannot meet the needs of users. For example: a video stream requires 6M bandwidth, but the xDSL line can only provide a maximum bandwidth of 4M due to factors such as distance. Although the operator can adopt a new access technology, this method cannot protect the existing equipment investment, so it will greatly increase the operator's cost investment. Some new access technologies such as VDSL (Very-high-bit-rate Digital Subscriber Loop) can satisfy the bandwidth, but are limited by the transmission distance and cannot solve the problem of bandwidth for long-distance users. need.

In order to protect existing equipment investment, reduce cost investment, and meet user needs for services, the existing technology bundles multiple traditional access lines, or bundles traditional access lines with new access lines to increase The bandwidth and transmission distance of the access line improve the reliability of data transmission.

In the prior art, a link aggregation control protocol is used to implement line bundling, and the link aggregation control protocol implements bundling and load sharing of multiple links at the link layer through the Ethernet protocol. The link aggregation control protocol maps different user sessions to different physical ports, so there is no need to sequence user data frames. After the Ethernet switch is enabled with the IRF (Intelligent Resilient Framework) feature to form a "combined device", it can realize cross-device port aggregation. The flow allocation of the link aggregation control protocol is realized by hash algorithm.

In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the flow distribution of the link aggregation control protocol is based on the session, and when the bandwidth of a session is greater than the bandwidth of the mapped physical port, it cannot In the case of line bundling, data frame forwarding is realized.

Contents of the invention

Embodiments of the present invention provide a data frame forwarding method and device based on line bundling, so as to realize real-time control and scheduling of user traffic according to status information of each access line bundled by the user.

In order to achieve the above purpose, an embodiment of the present invention provides a data frame forwarding method based on line bundling, including:

Obtain the first data frame sent from the user side or the network side;

When the first data frame is larger than the maximum transmission unit MTU of any access line bundled by the user, the first data frame is divided, wherein the sub-data frames obtained after the division are all less than or equal to the the MTU;

Adding a logical identifier corresponding to the access line bound by the user to the sub-data frame, sending a second data frame including the sub-data frame and the logical identifier of the sub-data frame, so that the sub-data frame is After the end is received, the data frame can be reassembled according to the logical identification.

On the other hand, the embodiment of the present invention also provides a data frame forwarding device based on line bundling, including:

a receiving unit, configured to receive the first data frame sent from the user side or the network side;

A segmentation unit, configured to segment the first data frame when the first data frame is larger than the maximum transmission unit MTU of any access line bundled by the user, wherein the sub-data frames obtained after the segmentation are are both less than or equal to the MTU;

An identification unit, configured to add a logical identification corresponding to the access line bundled by the user to the sub-data frame divided by the division unit;

A sending unit, configured to send a second data frame including the sub-data frame and a logical identifier of the sub-data frame, so that after the sub-data frame is received by the opposite end, the data frame can be reassembled according to the logical identifier.

In yet another aspect, an embodiment of the present invention further provides a gateway device, where the gateway device includes a data frame forwarding device based on line bundling.

Compared with the prior art, the embodiment of the present invention has the following advantages: the embodiment of the present invention adds a logical identifier corresponding to the access line bundled by the user to the divided sub-data frame, so that the sub-data frame is received by the opposite end. The data frame can be reassembled according to the identification. Therefore, on the basis of ensuring the transmission quality of the access line, the bandwidth of the access line is increased, the transmission distance is extended, and the transmission reliability is improved.

Description of drawings

FIG. 1 is a structural diagram of a data frame forwarding device based on line bundling according to an embodiment of the present invention;

2 is a flowchart of a data frame forwarding method for line bundling according to an embodiment of the present invention;

Fig. 3 is the schematic diagram of the protocol stack of the embodiment of the present invention;

4 is a schematic diagram of an uplink forwarding process of a data frame according to Embodiment 1 of the present invention;

5 is a schematic diagram of a downlink forwarding process of a data frame according to Embodiment 1 of the present invention;

6 is a schematic diagram of an uplink forwarding process of a data frame in Embodiment 2 of the present invention;

FIG. 7 is a schematic diagram of a downlink forwarding process of a data frame in Embodiment 2 of the present invention;

8 is a schematic diagram of the connection between the equipment CPE/RG of user 1 and the access node according to the embodiment of the present invention;

9 is a schematic diagram of the connection between the equipment CPE/RG of user 2 and the access node according to the embodiment of the present invention;

FIG. 10 is a schematic diagram of the connection between the equipment CPE/RG of user 3 and the access node according to the embodiment of the present invention;

FIG. 11 is a schematic diagram of the connection between the equipment CPE/RG of user 4 and the access node according to the embodiment of the present invention;

Fig. 12 is the connection diagram of the equipment ONT/ONU and OLT of user 5 in the embodiment of the present invention;

Fig. 13 is the connection schematic diagram of the equipment ONT/ONU and OLT of user 6 in the embodiment of the present invention;

14 is a schematic diagram of the connection relationship between the remote gateway and the AN when the network-side MUX/DeMUX is located in the AN according to the embodiment of the present invention;

15 is a schematic diagram of the connection relationship between the remote gateway, AN, and IP edge node or convergence node when the network side MUX/DeMUX is located at the IP edge node or convergence node according to the embodiment of the present invention;

FIG. 16 is a schematic diagram of the connection relationship between the AN and the L2C proxy device when the network-side MUX/DeMUX is located at the L2C proxy device according to the embodiment of the present invention.

Detailed ways

The embodiment of the present invention provides a data frame forwarding method based on line bundling, which can schedule user traffic in real time according to the status of each access line bound by the user. Wherein, user bundling refers to sending the data that the user needs to send from multiple uplinks, or receiving the data that the user needs to receive from multiple downlinks.

In the embodiment of the present invention, when using MAC (Media Access Control, Media Access Control) as a logical identifier, the ARP (Address Resolution Protocol) of IP (Internet Protocol, Internet Protocol) edge node or L2C (Layer2Control, two-layer control protocol) agent , Address Resolution Protocol (Address Resolution Protocol) table, one IP address can correspond to multiple MACs, and the downlink direction can select the MAC according to the scheduling rules for forwarding. In the embodiment of the present invention, in the case of bundling access lines at the Ethernet link layer across devices or across circuit boards, multiple access physical ports of a user are bundled, and then according to the state of each bundled access line, Real-time scheduling of user traffic, dynamic scheduling of the traffic of multiple access lines of different devices, and dynamic scheduling of traffic of multiple access lines on different circuit boards of the same device, thus increasing line transmission Bandwidth, extended transmission distance, and improved reliability.

As shown in Figure 1, it is a structural diagram of a data frame forwarding device based on line bundling according to an embodiment of the present invention, including:

The receiving unit 11 is configured to receive the first data frame sent from the user side or the network side;

Segmentation unit 12 is used for segmenting the first data frame when the first data frame is greater than the MTU (Maximum Transmission Unit, maximum transmission unit) of any access line bundled by the user, wherein the sub-data obtained after the segmentation The frames are all less than or equal to the MTU;

An identification unit 13, configured to add a logical identification corresponding to the access line bundled by the user for the sub-data frame segmented by the segmenting unit 12;

The sending unit 14 is configured to send a second data frame including a sub-data frame and a logical identifier of the sub-data frame, so that after the sub-data frame is received by the opposite end, the data frame can be reassembled according to the logical identifier.

The data frame forwarding device based on line bonding may also include:

The allocating unit 15 is configured to allocate bandwidth to each access line bound by the user according to the status information of each access line bound by the user acquired in real time.

Wherein, the identification unit 13 may include:

The uplink identification subunit 131 is used for forwarding the direction of the uplink data frame. When the VMAC identification is used as the logical identification of the sub-data frame, according to the mapping relationship table of the VMAC identification, MAC address and physical port of the first data frame, the second The source MAC address of a data frame is replaced by the logical identification of the sub-data frame;

or,

When the first data frame contains the user's C-VLAN label, map the C-VLAN label of the first data frame to the logical identifier of the sub-data frame; or, when the first data frame does not contain the C-VLAN label , then add a C-VLAN tag to the sub-data frame as the logical identifier of the sub-data frame.

Wherein, the identification unit 13 may include:

The downlink identification subunit 132 is used to replace the VMAC identification when the VMAC identification is used as the logical identification of the sub-data frame in the forwarding direction of the downlink data frame, and the destination IP address of the first data frame corresponds to a plurality of MAC addresses. is the logical identifier of the sub-data frame;

or,

When the first data frame contains a C-VLAN tag, and the destination IP address of the downlink user data frame corresponds to a MAC address, map the C-VLAN tag of the first data frame to the logical identifier of the sub-data frame.

An embodiment of the present invention also provides a gateway device, which may include the above-mentioned data frame forwarding device based on line bundling.

Wherein, the above-mentioned device for forwarding a data frame based on line bundling can be specifically implemented on a MUX (Multiplex, multiplexing)/DeMUX (Demultiplex, demultiplexing) device.

In the embodiment of the present invention, the user-side MUX/DeMUX device is located on the RG, and the network-side MUX/DeMUX device may be on the AN, L2C proxy device, or on the aggregation node or IP edge node. The IP edge node or L2C proxy device obtains the user's physical port information through the static configuration of the system, and can also extract the user's physical port information from the user information issued by the policy server or authentication server; Each physical port in the bonding group is assigned a corresponding logical identifier, and a physical port in each bonding group corresponds to at least one logical identifier, and the logical identifier is unique within the network range of the line bonding. Wherein, the L2C proxy device can be on the AN, the aggregation node or the IP edge node.

The MUX/DeMUX on the network side aggregates the uplink data frames and distributes the data frames from the network to each physical port of the user. The embodiment of the present invention realizes the transmission of a session in multiple physical lines, and the user's uplink data can be aggregated on different lines according to the user information in the user binding group, the logical identification and the state information of each bound line, and then sent to the network side forwarding; or, according to the user information in the user binding group, the logical identifier and the status information of each bundled line, the downlink data sent to the user is separately scheduled on different lines.

When MUX/DeMUX uses virtual MAC as a logical identifier, one IP address in the ARP (Address Resolution Protocol) table of an IP edge node or L2C proxy device can correspond to multiple MACs, and MUX/DeMUX can be selected according to scheduling rules MAC forwarding. The above scheduling rules may be: round robin scheduling, strict priority scheduling, weighted round robin scheduling and other rules. Therefore, the embodiment of the present invention implements the transmission of a session on multiple physical lines, thereby protecting the operator's existing line investment and improving the transmission capacity of the lines.

The IP edge node or L2C proxy device obtains the physical port information of the user binding group through the configured or delivered user information, and the MUX/DeMUX assigns a logical identifier to the user's physical port. Table 1 shows the corresponding relationship between user bundled group ID, physical port, logical ID, user ID and IP edge node MAC formed by MUX/DeMUX for the user bundled group.

Table 1

(1) The bonding group identifier corresponds to a group of bonding lines, and mainly identifies the data frames sent by the user to the network side. The binding group identifier can be identified by the user's MAC address, IP address, C-VLAN (Customer Virtual Local Area Network, user's virtual local area network) label, the user's access line or the user's physical port, or one or all of these information Multiple combinations can be used to identify, and other information can also be used to identify. Wherein, a binding group corresponds to a user ID, and the two are in a one-to-one correspondence.

(2) The physical port is the user-side physical port of the device, which can be defined according to the requirements of the operator. For example, the slot port is identified by Option 82 in TR-101. In the case of multi-line bonding, a user corresponds to at least two physical ports.

(3) The logical identifier is unique within the scope of the network where the line is bundled. The logical identifier can be one or both of the VMAC (Virtual Media Access Control, virtual media access control) identifier and the C-VLAN label, or it can be Other logical identifiers. Each physical port shall be assigned at least one logical identifier, but not limited to one logical identifier. A physical port may also have multiple logical identifiers, as shown in Table 2.

Table 2

(4) The user identification is mainly used to identify the frame sent to the user by the network, which can be identified by one or more of the user's MAC address, IP address, C-VLAN and the user's physical port, or can be identified by using Other information identifiers.

The IP edge node or the L2C proxy device distributes the logical identification information of each physical port to the forwarding unit of the device where the physical port is located through the L2C. The forwarding unit records the corresponding relationship between the binding group identifier and the logical identifier of the physical port, and converts the uplink and downlink frames from the user according to the corresponding relationship.

As shown in Figure 2, it is a flowchart of a data frame forwarding method based on line bundling in an embodiment of the present invention, specifically including:

Step S201, obtaining the first data frame sent from the user side or the network side.

Before obtaining the first data frame sent from the user side, obtain the state information of each access line bundled by the user. The state information of the access line includes: the maximum bandwidth, minimum bandwidth, actual bandwidth and interleaving of the access line One or more of the delays; then, according to the state information of the access line, allocate bandwidth to each access line bundled by the user.

Step S202, when the first data frame is larger than the MTU of any access line bundled by the user, divide the first data frame, wherein the sub-data frames obtained after division are all less than or equal to the MTU.

Step S203, add the logical identification corresponding to the access line bound by the user to the sub-data frame, and send the second data frame including the sub-data frame and the logical identification of the sub-data frame, so that the sub-data frame is received by the opposite end The data frame can be reassembled according to the logical identification.

In the forwarding direction of the uplink data frame, the first data frame is the user's uplink data frame received from the physical port, and the logical identifier is determined based on the correspondence between the physical port and the logical identifier.

In the uplink data frame forwarding direction, if the VMAC identifier is used as the logical identifier of the sub-data frame, then according to the mapping relationship table (for example: Table 2) of the VMAC identifier, MAC address and physical port of the first data frame, the first data The source MAC address of the frame is replaced by the logical identifier of the sub-data frame;

or,

If the C-VLAN label of the user is included in the first data frame, then the C-VLAN label of the first data frame is mapped as the logical identifier of the sub-data frame; or, if the C-VLAN label is not included in the first data frame, Then add a C-VLAN tag to the sub-data frame as a logical identifier of the sub-data frame.

In the downlink data frame forwarding direction, if the VMAC identification is used as the logical identification of the sub-data frame, when the destination IP address of the first data frame corresponds to multiple MAC addresses, the VMAC identification is replaced with the logical identification of the sub-data frame;

or,

If the first data frame contains a C-VLAN tag and the destination IP address of the first data frame corresponds to a MAC address, map the C-VLAN tag of the first data frame to the logical identifier of the sub-data frame.

In the above embodiments, the logical identifier is one or both of the C-VLAN tag and the VMAC identifier, but the embodiment of the present invention is not limited thereto, and the logical identifier can also be other forms of logical identifiers. The form does not affect the implementation of the embodiments of the invention.

In the embodiment of the present invention, a logical identifier corresponding to the access line bundled by the user is added to the divided sub-data frame, so that the sub-data frame can be reassembled according to the identifier after the sub-data frame is received by the opposite end. Therefore, on the basis of ensuring the transmission quality of the access line, the bandwidth of the access line is increased, the transmission distance is extended, and the transmission reliability is improved.

The embodiment of the present invention performs data frame forwarding for line bundling according to the protocol stack shown in FIG. /Encapsulate and decapsulate packets on the device where DeMUX is located. The Layer 2 device between the two MUX/DeMUX needs to change or process the header of the received data frame.

The forwarding process of the uplink user data frame is as follows:

The user-side MUX/DeMUX can calculate the allocation ratio of user data or the allocated uplink bandwidth on each access line according to the state information of each access line accessed by the user. The status information of the access line includes status information such as uplink maximum bandwidth, minimum bandwidth, actual bandwidth, or interleaving delay. The user-side MUX/DeMUX can also allocate or adjust the proportion of uplink user data or uplink bandwidth of each access line through static or dynamic configuration (such as TR-069).

After the RG receives the uplink user data frame, when the uplink user data frame is larger than the maximum transmission unit of each access line bundled by the user, the RG divides the data in the data frame. The divided data is added to the Layer 2 packet header, and sent to each line according to the proportion of uplink user data allocated on each line or the uplink bandwidth. The data frame can also be directly encapsulated as data in MAC-in-MAC, PBT (Provider Backbone Transport, Provider Backbone Transport), and then scheduled and forwarded.

Each uplink physical port can use round-robin scheduling, strict priority scheduling, and weighted round-robin scheduling to schedule the data in the cache. Packets should be forwarded from the same physical port as much as possible.

The user's uplink AN receives the uplink data frame from the corresponding port. If the physical port corresponds to a specific binding user, the AN needs to convert the data frame from the port before forwarding the data frame, and add the corresponding logical identifier.

The MUX/DeMUX on the network side receives the uplink user data frame, and processes it according to the logic identifier carried in the data frame. The MUX/DeMUX on the network side can know which physical port of a certain user the data frame comes from according to the logical identifier carried in the data frame. For data frames from the same user binding group, the network-side MUX/DeMUX removes the logical identifier of the data frame according to the logical identifier and the physical port mapping table, and restores the user's original data. For example, if the logical identifier is a virtual MAC, the network-side MUX/DeMUX uses the user identifier MAC to replace the virtual MAC; if the logical identifier is C-VLAN, multiple C-VLANs of this user are mapped to one Corresponding C-VLAN. The converted frame restores the sequence of the data frame according to the extended message header, and the restored data frame can be transmitted to the network.

The forwarding process of the downlink user data frame is as follows:

The network-side MUX/DeMUX receives a downlink user data frame, and the downlink user data frame includes a user identifier. According to the user ID and the status information of the user stored in the network-side MUX/DeMUX, the network-side MUX/DeMUX can obtain the user's physical port and the logical ID corresponding to the user's physical port by looking up Table 1 and Table 2.

The network-side MUX/DeMUX collects state information of each physical port, which includes state information such as downlink bandwidth control, downlink maximum bandwidth, minimum bandwidth, actual bandwidth, or interleaving delay. The MUX/DeMUX on the network side allocates downlink frame and line bandwidth according to these state information.

When the received downlink user data frame is larger than the maximum transmission unit of each access line bundled by the user, the network side MUX/DeMUX divides the downlink user data frame. The divided data frames are sent to each line according to the bandwidth allocated on each line. The data frame sent to each line needs to add the logical identification of the corresponding physical port of the line. For example: when the logical identifier is VMAC, convert the destination MAC of the data frame into the corresponding VMAC of the line; when the logical identifier is C-VLAN, the C-VLAN logical identifier in the frame is mapped to the corresponding C-VLAN of the user. VLAN ID. The MUX/DeMUX on the network side can forward the frame added with the logical identifier to the corresponding physical port according to the correspondence tables shown in Table 1 and Table 2.

The AN receives the data frame sent by the uplink network device, and if the received data frame has an identifiable binding group identifier and/or logical identifier, the AN removes the logical identifier and restores the original data of the data frame. The recovered data frame can be forwarded to the corresponding physical port according to the corresponding forwarding table shown in Table 1 and Table 2, and then can be forwarded to the user RG from each physical port.

The user-side MUX/DeMUX in the user RG identifies the data frame according to the bundled group identifier carried in the data frame, restores the sequence of the data frame by extending the header, and forwards the restored data frame to the user.

In the embodiment of the present invention, a data frame forwarding process using VMAC as a logical identifier is described for all Layer 2 switching devices between the user-side MUX/DeMUX and the network-side MUX/DeMUX.

Among them, the uplink forwarding process of the data frame is shown in Figure 4, specifically including:

In step S401, the RG receives the data frame sent by the user host, buffers the data frame to be forwarded, and encapsulates the data frame to be forwarded.

The source MAC of the data frame received by the RG is the host address MACp, and the destination MAC of the data frame is the address MACe of the BRAS (Broadband Remote Access Server, Broadband Remote Access Server).

After the RG receives the data frame sent by the user host, the RG learns the user host address MACp on the user port, forms a MAC forwarding table, and caches the data frame to be forwarded. Then, the RG divides the cached data frame into data blocks, adds an extension header to each data block, and encapsulates the data frame to be forwarded. If the RG is a Layer 3 device, the source MAC of the encapsulated data frame is the address MACx of the RG; if the RG is not a Layer 3 device, the encapsulated data frame uses the user's host address as the destination MAC.

In step S402, the RG forwards the uplink data frame to the physical port of the AN according to the data ratio or bandwidth allocated to the user's multiple ports through scheduling rules. The RG counts the uplink data ratio or uplink bandwidth of the two ports of the user according to the state information of the uplink, or allocates the uplink data ratio or bandwidth for the two ports of the user according to the configuration of the RG.

Step S403, the uplink AN physical port receives the user's uplink data frame, and replaces the source MAC address of the data frame with the corresponding VMAC of the user according to the configured physical port and logical identification VMAC information. Since a physical port can correspond to multiple VMACs, AN will save a relationship table, for example: MACx:Port 1<--->VMACy. At the same time, AN learns the MAC or VMAC of the physical port to form a MAC forwarding table, such as: SVL (Shared Virtual Local Area Network Learning, shared virtual local area network learning) or IVL (Independent Virtual Local Area Network Learning, independent virtual local area network learning) table.

In step S404, the AN searches for the destination MACe according to the MAC forwarding table formed by the AN.

In step S405, the AN forwards the data frame sent by the user to the MUX/DeMUX on the network side.

Step S406, the MUX/DeMUX on the network side receives the uplink user data frame, restores the sequence of the data frame according to the logical identifier carried by the uplink user data frame, and continues to forward the uplink user data frame to the network side. Specifically, it can be:

After the MUX/DeMUX on the network side receives the uplink user data frame, it learns VMACy on the corresponding port, forms a MAC forwarding table, and forms an ARP forwarding table at the same time. There can be multiple VMACs corresponding to one user IP in the table. The MUX/DeMUX on the network side determines the data frames belonging to the same user by looking up the corresponding table between the user's physical port and logical identifier according to the source VMAC of the data frames received from different ports, and restores the sequence of the data frames according to the extended message header. Put it in the cache as data. The MUX/DeMUX on the network side adds MACz to the data frame as the source MAC and as the user identifier. If user data has multiple source MACs, multiple unique MACs are required to correspond to them respectively. The destination MAC of the frame is still the MACe of the BRAS, and the MUX/DeMUX on the network side continues to forward the recovered data frame to the network side.

The downlink forwarding process of the data frame is shown in Figure 5, specifically including:

Step S501, the network side MUX/DeMUX receives the data frame, and when it is determined that the downlink user data frame is larger than the maximum transmission unit of the access line, divides the downlink user data frame, and adds a logical identifier to the divided downlink user data frame.

The source address of the data frame received by the network side MUX/DeMUX is MACe, and the destination address is MACz. The destination MAC may be a group of MACs. The network-side MUX/DeMUX forms a MAC forwarding table by learning the source address MACe at the port receiving the data frame, and determines the user to which the data frame belongs according to the destination MACz or the group MAC corresponding to the destination MACz. The network-side MUX/DeMUX caches the data in the data frame. When the downlink user data frame is larger than the maximum transmission unit of the access line, the network-side MUX/DeMUX divides the downlink user data frame into data blocks and adds extension header.

The MUX/DeMUX on the network side checks the ARP table to determine that there are multiple MACs corresponding to the destination IP, and adds the logical identification VMAC corresponding to different ports in the downlink data frame according to the downlink data ratio of each port, for example: VMACy. The MUX/DeMUX on the network side allocates the proportion or bandwidth of downlink data frames according to the status information reported by the L2C or the configuration of the MUX/DeMUX on the network side.

Step S502, the network side MUX/DeMUX forwards the downlink data frame according to the MAC forwarding table. The source MAC of the forwarded downlink data frame is MACe.

In step S503, the AN that receives the data frame replaces the destination MAC of the data frame with MACx.

After receiving the data frame forwarded by the network-side MUX/DeMUX, the AN forwards the data frame to the corresponding physical port according to the MAC forwarding table. The physical port identifies that the data frame is a frame of a bundled group user, and replaces the destination MAC with MACx according to the corresponding physical port relationship table, for example: MACx:Port 1<--->VMACy.

In step S504, the AN forwards the data frame to the user.

Step S505, the user-side MUX/DeMUX on the RG receives the downlink data frame, restores the sequence of the data frame, and sends the data frame to the corresponding user host.

After the user-side MUX/DeMUX receives the downlink data frame, the user-side MUX/DeMUX removes the extended header information in the data frame and restores the sequence of the data frame. According to the information such as the ARP table and the IP address carried by the data frame, the destination MAC of the data frame is recovered. Then, the user-side MUX/DeMUX sends the data frame to the corresponding user host according to the MAC forwarding table.

Embodiment 2 of the present invention describes the data frame forwarding process in which the MUX/DeMUX on the user side and the MUX/DeMUX on the network side are all Layer 2 switching devices, and a C-VLAN tag is used as a logical identifier.

Wherein, the uplink forwarding process of the data frame is shown in Figure 6, specifically including:

In step S601, the RG receives the data frame sent by the user host, caches the data frame to be forwarded, and encapsulates the data frame to be forwarded.

The source MAC of the data frame sent by the user host is the address MACp of the user host, and the destination MAC is the address MACe of the BRAS. The RG learns the address MACp of the user host on the user port, forms a MAC forwarding table, and forms an ARP table according to the user IP, and caches the data frames to be forwarded. The RG divides the cached data frame into data blocks, adds an extension header to each data block, and encapsulates the data frame to be forwarded. If the RG is a Layer 3 device, the source MAC of the encapsulated data frame is the address MACx of the RG; if the RG is not a Layer 3 device, the encapsulated data frame uses the user's host address as the destination MAC.

In step S602, the RG forwards the uplink data frame to the physical port of the AN according to the data ratio or bandwidth allocated to the multiple ports of the user through scheduling rules. The RG counts the uplink data ratio or uplink bandwidth of the two ports of the user according to the state information of the uplink, or allocates the uplink data ratio or bandwidth for the two ports of the user according to the configuration of the RG.

In step S603, the uplink AN physical port receives the user's uplink data frame, learns the MAC address, and generates a MAC forwarding table.

If the uplink data frame contains the C-VLAN identifier of the user, the C-VLAN identifier is mapped to a C-VLAN logical identifier. If the data frame does not contain the user's C-VLAN identifier, then add the corresponding C-VLAN logical identifier according to the configuration information. Then map the service type, physical port configuration or logical identification information of the frame into different S-VLANs.

The MAC forwarding table generated by the AN is an IVL forwarding table, and the FID (Filtering Identifier, filtering identifier) item of the IVL forwarding table is generated according to the C-VLAN identifier and the S-VLAN identifier.

In step S604, the AN forwards the data frame to the corresponding port according to the MAC forwarding table or the 1:1 VLAN mapping table.

Step S605, the network-side MUX/DeMUX receives the user's uplink data frame, restores the sequence of the uplink data frame according to the logic identifier carried by the uplink data frame, and continues to forward the uplink user data frame to the network side. Specifically, it can be:

The MUX/DeMUX on the network side learns the MACx at the port that receives the user's uplink data frame, and generates an FID according to the C-VLAN identifier and the S-VLAN identifier to form a MAC forwarding table. At the same time, an ARP forwarding table is formed, and one MAC in the table corresponds to one user IP.

According to the C-VLAN of the uplink data frame received from different ports, the MUX/DeMUX on the network side determines the uplink data frame belonging to the same user by searching the corresponding table between the user's physical port and the logical identifier, and replaces the C-VLAN logical identifier with the corresponding User ID C-VLANx. Then, the MUX/DeMUX on the network side restores the sequence of the uplink data frame according to the extended message header, and buffers the uplink data frame.

The MUX/DeMUX on the network side adds a Layer 2 header to the uplink data frame and schedules it according to the S-VLAN. The source MAC and destination MAC of the uplink data frame remain unchanged. Then continue to forward the changed uplink data frame to the network.

The downlink forwarding process of the data frame is shown in Figure 7, specifically including:

Step S701, the network side MUX/DeMUX receives the data frame, and when it is determined that the downlink user data frame is larger than the maximum transmission unit of the access line, divides the downlink user data frame, and adds a logical identifier to the divided downlink user data frame.

The data frame received by the network-side MUX/DeMUX includes a C-VLAN identifier, its source address is MACe, and its destination address is MACx. The destination MAC may be a group of MACs. The user to which the downlink data frame belongs can be determined according to the destination address MACx and/or the C-VLAN identifier.

The network-side MUX/DeMUX buffers the data in the downlink data frame. When the downlink user data frame is larger than the maximum transmission unit of the access line, the network-side MUX/DeMUX divides the downlink user data frame into data blocks, and divides each data block Add extension headers.

The MUX/DeMUX on the network side determines the MACx corresponding to the destination IP by searching the ARP table, and adds the logical identifier C-VLAN corresponding to each port according to the downlink data ratio of each port. The source MAC of the downlink data frame remains unchanged as MACe. The physical port of the MUX/DeMUX on the network side learns the MAC address to form an IVL table, where the FID of the IVL table is C-VLAN+S-VLAN. If the downlink data frame is forwarded in the form of 1:1 VLAN, the physical port of the MUX/DeMUX on the network side does not need to learn MAC.

Step S702, the network side MUX/DeMUX forwards the changed downlink data frame to the physical port corresponding to the AN according to the MAC forwarding table or the 1:1 VLAN mapping table.

In step S703, the AN sets or removes the C-VLAN of the downlink data frame according to the mapping relationship between the physical port receiving the downlink data frame and the C-VLAN.

In step S704, the AN forwards the downlink data frame to the user.

Step S705, the user-side MUX/DeMUX on the RG receives the user's downlink data frame, restores the sequence of the data frame according to the extended header information in the downlink data frame, and sends the downlink data frame to the corresponding user host according to the MAC forwarding table.

After the user-side MUX/DeMUX restores the order of the data frames according to the extended header information in the downlink data frame, the user-side MUX/DeMUX restores the destination MAC of the downlink data frame according to the ARP table and the IP address of the downlink data frame, and according to The MAC forwarding table sends the downlink data frame to the corresponding user host.

Embodiment 3 of the present invention describes the process of using an IP bridge to forward data frames with an ARP Proxy (ARP proxy) device between the user-side MUX/DeMUX and the network-side MUX/DeMUX.

Since AN has the ARP Proxy function, it can only use C-VLAN as a logical identifier. At this time, the forwarding process of the uplink and downlink data frames is the same as the data frame forwarding process described in Embodiment 2. If VMAC is used as the identifier, the source MAC will be replaced by AN's MAC during ARP Proxy processing. When forwarding downlink data frames, if a user has multiple physical ports, AN cannot determine which port to send the data frame from .

Embodiment 4 of the present invention describes bandwidth control of bundled lines. For example: a user has signed a 2M uplink and downlink bandwidth agreement, the access scene is shown in Figure 9, and there are two different uplink interfaces connected to the network. Among them, the uplink bandwidth of Port 6 of the user xDSL access line is 2.3M, and the downlink bandwidth is 2.3M; the uplink bandwidth of Port 5 is 0.5M, and the downlink bandwidth is 1.5M.

The bandwidth ratio allocated by user MUX/DeMUX can be set as the initial ratio according to the line status or static configuration, and can also be dynamically configured or adjusted through TR069. For example: the user-side MUX/DeMUX distributes the user's uplink data frames on the two lines at a ratio of 10:1 according to the line status. L2C controls the uplink bandwidth of each physical port according to the status of each line. For example, a ratio of 9:1 can be used, that is, the uplink rate of one line is limited to 1.8M, and the uplink rate of the other line is limited to 0.2M.

The physical ports of the AN report status information in real time through L2C. If the status of one physical port of the user is congested and the status of the other physical port is idle, the L2C proxy device or IP edge node can appropriately increase the congestion physical port according to the status information reported by the AN. Port bandwidth control ratio to ensure normal transmission of user data with protocol bandwidth.

If adjusting the rate of the congested physical port to the maximum bandwidth, or adjusting the limited bandwidth of the congested physical port to the average rate of the line cannot solve the congestion problem, you need to adjust the allocation ratio of the user-side MUX/DeMUX uplink data frames.

If the two physical ports of the user are congested, the bandwidth limit ratio can also be adjusted appropriately to minimize the congestion.

If the port rate of Port 5 is affected by the outside world for a certain period of time, the uplink rate decreases, resulting in user data congestion on Port 5. Due to the limitation of the line bandwidth, it takes a long time to quickly transmit the congested frames even if the rate is restored. The MUX/DeMUX on the user side can appropriately adjust the bandwidth allocation ratio of the uplink data of the two lines according to the line status to ensure data transmission.

In the embodiment of the present invention, in the case of cross-device or cross-circuit board Ethernet link layer access line bundling, dynamic scheduling of line traffic on different devices and different circuit boards can be realized, thereby increasing the transmission bandwidth of the line, extending the The transmission distance is improved, and the transmission reliability is improved.

Because a user may access the network through one or more access lines. Since one access line corresponds to one access physical port, there is a situation that a user has multiple access physical ports corresponding to it in the network. A data frame forwarding method, device, and system for line bundling proposed by the embodiments of the present invention are applicable to the following access scenarios.

As shown in Figure 8, the equipment CPE (Customer Premise Equipment)/RG (Remote Gateway) of user 1 is respectively connected to two physical ports Port 5 and Port 5 of the access node through two uplink ports. 6, where the physical ports Port 5 and Port 6 can be located on the same or different circuit boards, so user 1 has two physical ports Port 5 and Port 6 corresponding to it in the network.

As shown in FIG. 9 , the equipment CPE/RG of user 2 is respectively connected to two different ANs (Access Node, access node) through two uplink ports. The physical ports corresponding to these two ANs are Port 6 of access node 1 and Port 1 of access node 2, so user 2 has Port 6 of access node 1 and Port 1 of access node 2 in the network. A physical port corresponds to the user 2.

In addition, there may be multiple physical ports corresponding to one user on the uplink of the access node, aggregation node (Aggregation Node) and network edge node (IPEdge). In this case, since the bandwidth of the physical interface is large enough to meet the session needs of a single user, link aggregation can be used to bundle session lines.

As shown in Figure 10, User 3 is respectively connected to two physical ports of the aggregation node through the uplink physical ports Port 1 and Port 2 of the AN. In this way, user 3 has two physical ports, Port 1 and Port 2 of AN, corresponding to it in the network.

A user's physical port can be nested in multiple levels, and the physical ports in multi-level nesting can be bundled in multiple nests, or single-level bundled. For example, the scenario shown in FIG. 11 is a combination of the scenarios shown in FIG. 9 and FIG. 10 . For the scenario shown in FIG. 11 , multi-level nested bundling and single-level bundling can be used to implement session line bundling.

For multi-level nested bonding, the inner layer bonding corresponds to the bonding of the upstream physical ports of the AN, for example: the bonding of Port 1 and Port 2 of AN1, and the bonding of Port 3 and Port 4 of AN2. The outer binding corresponds to the binding of the access line ports between the RG and the IP edge network, for example, the physical port binding of Port 7 of AN1 and Port 8 of AN2. Both the inner and outer layers of multi-level nested bundling can use the bundling method proposed by the embodiment of the present invention, or a mixed mode can be used for bundling. The bundling method, for example: link aggregation bundling method, etc.

For single-level bonding, a combination of access line physical ports and AN uplink physical ports can be used as the bonding physical port. In the scenario shown in Figure 11, the combinations of physical ports can be Port7+Port1, Port 7+Port2, Port 8+Port 3, and Port 8+Port 4.

As shown in Figure 12, users 5 of ONT (Optical Network Termination, optical network terminal) 1/ONU (Optical Network Unit, optical network unit) 1 are uplinked to an OLT (Optical Network Unit) through different optical splitters (splitter 1 and splitter 2). Line Termination, optical line terminal) on different optical modules. User 5 has Port 1 of optical splitter 1 and Port 6 of optical splitter 2 bundled together in the network. The binding module on the user side is located on the ONT/ONU, and the binding module on the network side can be located on the OLT, aggregation node (Aggregation Node) or network edge node (IP Edge).

As shown in Figure 13, user 6 of ONT 1/ONU1 is upstreamed to two different OLTs through different optical splitters (splitter 1 and splitter 2). User 6 has Port 1 of optical splitter 1 and Port 6 of optical splitter 2 in the network that need to be bundled together. The binding module on the user side is located on the ONT/ONU, and the binding module on the network side can be located on the aggregation node (Aggregation Node) or the network edge node (IP Edge).

Wherein, in the scenario shown in FIG. 8 , the network-side MUX/DeMUX can be on the AN, or on the aggregation node or the IP edge node. When the network-side MUX/DeMUX is located in the AN, a schematic diagram of the connection relationship between the remote gateway and the AN is shown in FIG. 14 . In Figure 14, the network-side MUX/DeMUX is located on the main control board interface unit, which aggregates the data frames from different service boards according to the logical identification, and distributes the data frames from the network side to the user physical ports on each service board.

In the scenario shown in Figure 9, the network-side MUX/DeMUX can be on the convergence node or IP edge node. When the network-side MUX/DeMUX is located at the IP edge node or convergence node, the remote gateway, AN, and IP edge node or convergence node As shown in Figure 15, the network-side MUX/DeMUX of the IP edge node or aggregation node aggregates data frames from different access nodes according to the logical identifier.

In the scenario shown in Figure 10, the network-side MUX/DeMUX can be on the L2C proxy device. When the network-side MUX/DeMUX is located on the L2C proxy device, the connection relationship between the AN and the L2C proxy device is shown in Figure 16. The L2C proxy The network-side MUX/DeMUX of the device aggregates data frames from different uplink ports of the AN.

In the scenario shown in Figure 11, for multi-level nested bundling, there may be multiple network-side MUX/DeMUX, which are respectively located on the aggregation node 1, the aggregation node 2, and the IP edge node. For single-level bundling, the network-side MUX/DeMUX is located on the IP edge node.

In addition, the user-side MUX/DeMUX is located on the aggregation device where the bundled lines are close to the user side, such as the remote gateway in Figure 8 and the access node in Figure 10, and their corresponding connection diagrams are shown in Figure 15 and Figure 16 respectively .

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solution of the present invention It can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), and include several instructions to make a computer device (which can be It is a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in one or more devices different from the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (10)

1. A data frame forwarding method based on line bundling, characterized in that, comprising: Obtain the first data frame sent from the user side or the network side; When the first data frame is larger than the maximum transmission unit MTU of any access line bundled by the user, the first data frame is divided, wherein the sub-data frames obtained after the division are all less than or equal to the the MTU; Adding a logical identifier corresponding to the access line bound by the user to the sub-data frame, sending a second data frame including the sub-data frame and the logical identifier of the sub-data frame, so that the sub-data frame is After the end is received, the data frame can be reassembled according to the logical identification. 2. The data frame forwarding method based on line bundling according to claim 1, characterized in that, before the step of obtaining the first data frame sent from the user side, further comprising: Obtaining state information of each access line bundled by the user, the state information of the access line includes: one or more of the maximum bandwidth, minimum bandwidth, actual bandwidth and interleaving delay of the access line; Allocate bandwidth for each access line bundled by the user according to the state information. 3. The data frame forwarding method based on line bundling according to claim 1, characterized in that, in the uplink data frame forwarding direction, The first data frame is the user's uplink data frame received from the physical port; The logical identifier is determined based on the correspondence between the physical port and the logical identifier. 4. The data frame forwarding method based on line bundling according to claim 1, characterized in that, in the uplink data frame forwarding direction, if the VMAC identifier is used as the logical identifier of the sub-data frame, then according to the first data frame The mapping relationship table of the VMAC identification, MAC address and physical port, the source MAC address of the first data frame is replaced by the logical identification of the sub-data frame; or, If the first data frame contains the user's C-VLAN tag, then map the C-VLAN tag of the first data frame to the logical identifier of the sub-data frame; or, if the first data frame contains If the C-VLAN tag is not included, a C-VLAN tag is added to the sub-data frame as a logical identifier of the sub-data frame. 5. The data frame forwarding method based on line bundling according to claim 1, characterized in that, in the downlink data frame forwarding direction, if the VMAC identifier is used as the logical identifier of the sub-data frame, when the first data frame When the destination IP address corresponds to multiple media access control MAC addresses, the VMAC identifier is replaced with the logical identifier of the sub-data frame; or, If the first data frame contains a C-VLAN tag, and the destination IP address of the downlink user data frame corresponds to a MAC address, map the C-VLAN tag of the first data frame to the sub-data frame logical identifier. 6. A data frame forwarding device based on line bundling, characterized in that it comprises: a receiving unit, configured to receive the first data frame sent from the user side or the network side; A segmentation unit, configured to segment the first data frame when the first data frame is larger than the maximum transmission unit MTU of any access line bundled by the user, wherein the sub-data frames obtained after the segmentation are are both less than or equal to the MTU; An identification unit, configured to add a logical identification corresponding to the access line bundled by the user to the sub-data frame divided by the division unit; A sending unit, configured to send a second data frame including the sub-data frame and a logical identifier of the sub-data frame, so that after the sub-data frame is received by the opposite end, the data frame can be reassembled according to the logical identifier. 7. The data frame forwarding device based on line bonding according to claim 6, further comprising: The allocation unit is configured to allocate bandwidth to each access line bound by the user according to the state information of each access line bound by the user obtained in real time. 8. The data frame forwarding device based on line bundling according to claim 6, wherein the identification unit comprises: The uplink identification subunit is used for forwarding the uplink data frame. When the VMAC identification is used as the logical identification of the sub-data frame, according to the mapping relationship table of the VMAC identification, MAC address and physical port of the first data frame, replacing the source MAC address of the first data frame with the logical identifier of the sub-data frame; or, When the first data frame contains the user's C-VLAN tag, mapping the C-VLAN tag of the first data frame to the logical identifier of the sub-data frame; or, when the first data frame contains If the C-VLAN tag is not included, the C-VLAN tag is added to the sub-data frame as the logical identifier of the sub-data frame. 9. The data frame forwarding device based on line bundling according to claim 6, wherein the identification unit comprises: The downlink identification subunit is used for forwarding the downlink data frame, when the VMAC identification is used as the logical identification of the sub-data frame, and the destination IP address of the first data frame corresponds to multiple media access control MAC addresses , replacing the VMAC identifier with the logical identifier of the sub-data frame; or, When the first data frame contains a C-VLAN tag, and the destination IP address of the downlink user data frame corresponds to a MAC address, map the C-VLAN tag of the first data frame to the sub-data The logical identifier of the frame. 10. A gateway device, characterized in that the gateway device comprises the data frame forwarding device based on line bonding according to any one of claims 6-9.

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