WO2016206432A1

WO2016206432A1 - Time-division multiplexed data transmission method and device, and network-side edge device

Info

Publication number: WO2016206432A1
Application number: PCT/CN2016/077783
Authority: WO
Inventors: 谢伟生
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-25
Filing date: 2016-03-30
Publication date: 2016-12-29
Also published as: CN106330499A

Abstract

The present invention provides a time-division multiplexed data transmission method and device, and a network-side edge device. The method comprises: acquiring, from a user-side link established by a user-side edge device and a first network-side edge device, a time-division multiplexed data stream of a user needed to be sent from the first network-side edge device to a second network-side edge device and acquiring a VLAN tag for identifying the user-side link; packaging the time-division multiplexed data stream according to the VLAN tag to obtain an IP packet; acquiring, from a pre-stored pseudo wire (PW) routing table, a multi-protocol label switching (MPLS) tag corresponding to the VLAN tag, and packaging the IP packet into an MPLS packet according to the MPLS tag and sending to the second network-side edge device via a packet switched network (PSN); unpackaging, by the second network-side edge device, the MPLS packet to obtain the time-division multiplexed data stream. The present invention solves the problem in the field of emulation in which the time-division multiplexing service has insufficient resources of pseudo wire tags.

Description

Method, device and network side edge device for transmitting time division multiplexed data

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and device for transmitting time division multiplexed data and a network side edge device.

Background technique

As users' requirements for bandwidth become higher and higher, the trend of all-IP of communication networks becomes more and more obvious. This requires the transformation of the traditional communication network, and the existing network resources can not be wasted, so it still needs to have the business support capability for the traditional Time Division Multiplex (TDM) link.

In order to implement traditional TDM service functions in a Packet Switched Network (PSN), such as an IP network or a Multi-Protocol Label Switching (MPLS) network, an end-to-end pseudowire simulation is required ( Pseudo-Wire Emulation Edge to Edge (PWE3) Layer 2 service bearer technology. PWE3 is a type of Virtual Private Wire Service (VPWS). It is a Layer 2 Virtual Private Network (L2VPN) technology. User Layer 2 packets are transparently transmitted between Pseudo Wires (PWs). After the PW virtual link is established, the mapping between the user-side AC (Access Circuit) interface and the PW is completely determined. For the core P device, only the MPLS label needs to be forwarded based on the MPLS label. It does not care about Layer 2 user packets encapsulated in MPLS packets.

In the current TDM service simulation function design, in order to implement the end-to-end simulation of the TDM service, an AC link and two PW labels (PW private network labels and PW public network labels) are bound. In this case, the PE device needs to reserve a certain number of PW private network labels for the TDM emulation service. This part of the PW private network label is wasted and cannot be used on the public network. This causes the PW label of the PW public network label and the PW label. The problem of insufficient resources.

Summary of the invention

An object of the present invention is to provide a method and device for transmitting time division multiplexed data and a network side edge device, which solves the problem of insufficient PW tag resources in the existing TDM service emulation technology.

In order to achieve the above object, an embodiment of the present invention provides a method for transmitting time-division multiplexed data, which is applied to a first network side edge device, and includes:

Obtaining, from the user side link established by the client side edge device and the first network side edge device, a time division multiplexing TDM data stream that the user needs to transmit from the first network side edge device to the second network edge device, and Obtaining a virtual local area network VLAN tag for identifying the user side link;

Encapsulating the TDM data stream according to the VLAN tag to obtain an IP packet;

Obtaining a multi-protocol label corresponding to the VLAN tag in a pre-stored pseudowire PW routing table The MPLS label is exchanged, and the IP packet is encapsulated into an MPLS packet according to the MPLS label, and sent to the second network edge device by using the packet switching network PSN, where the second network edge device pairs the MPLS The packet is decapsulated to obtain the TDM data stream.

Optionally, the step of performing the encapsulation process on the TDM data stream according to the VLAN tag to obtain an IP packet includes:

Demultiplexing the TDM data stream to obtain an E1 frame;

Adding the VLAN tag, the Ethernet header, and the link layer header to the E1 frame to obtain the IP packet.

Optionally, the MPLS label includes: a PW label and a tunnel label corresponding to the PW label; and

Obtaining, in the pre-stored pseudo-wire PW routing table, the multi-protocol label switching MPLS label corresponding to the VLAN tag, including:

In the pre-stored PW routing table, it is found whether there is a PW label corresponding to the VLAN tag;

If yes, the PW label corresponding to the VLAN tag is obtained, and the tunnel label corresponding to the PW label is obtained.

Optionally, the encapsulating the IP packet into an MPLS packet according to the MPLS label includes:

Stripping the VLAN tag of the IP packet, and encapsulating the tunnel label and the PW label into the IP packet to obtain the MPLS packet.

Optionally, the VLAN tag includes a first VLAN tag and a second VLAN tag;

The 0th-5th bit of the first VLAN tag is used to indicate the length of the packet payload, the 6th-10th bit is used to identify the packet service type, the 11th bit is used to indicate the packet transmission direction, and the 12th bit is the standard. Field, the 13th-15bit is used to indicate the priority of the packet;

The 0th-7th bit of the second VLAN tag is used to identify the number of the user side link, the 8th bit is used to identify the aggregation class attribute of the packet service, and the 9th-11th bit is used to indicate the number of the physical interface of the user side link. The 12th bit indicates the standard field, and the 13th-15bit is used to indicate the priority of the message.

The embodiment of the invention further provides a time-division multiplexed data transmission device, which is applied to the first network side edge device, and includes:

a first acquiring module, configured to acquire, from the user side link established by the client side edge device and the first network side edge device, a TDM that the user needs to transmit from the first network side edge device to the second network edge device Data flow, and obtaining a virtual local area network VLAN tag for identifying the user side link;

The first processing module is configured to perform encapsulation processing on the TDM data stream according to the VLAN tag to obtain an IP packet;

The second processing module is configured to obtain a multi-protocol label switching MPLS label corresponding to the VLAN tag in a pre-stored pseudo-line PW routing table, and encapsulate the IP packet into an MPLS packet according to the MPLS label. And sending, by the PSN network, the second network edge device, where the second network edge device decapsulates the MPLS packet to obtain the TDM data stream.

Optionally, the first processing module includes:

a first processing unit, configured to perform demultiplexing on the TDM data stream to obtain an E1 frame;

The second processing unit is configured to add the VLAN tag, the Ethernet header, and the link layer header in the E1 frame to obtain the IP packet.

The second processing module includes:

The first searching unit is configured to: in the pre-stored PW routing table, find whether there is a PW label corresponding to the VLAN tag;

The first acquiring unit is configured to acquire a PW label corresponding to the VLAN tag, and obtain a tunnel label corresponding to the PW label, if a PW label corresponding to the VLAN tag exists in the PW routing table.

Optionally, the second processing module includes:

The third processing unit is configured to strip the VLAN tag of the IP packet, and encapsulate the tunnel label and the PW label into the IP packet to obtain the MPLS packet.

The embodiment of the invention further provides a network side edge device, comprising the transmission device of the time division multiplexed data as described above.

The embodiment of the invention further provides a method for transmitting time division multiplexed data, which is applied to the first network side edge device, and includes:

Obtaining a multi-protocol label switching MPLS packet sent by the packet switching network PSN, where the MPLS packet is a TDM that the second network side edge device needs to transmit from the second network side edge device to the first network edge device The data stream is obtained by encapsulation processing;

Obtaining a VLAN tag corresponding to the MPLS label carried in the MPLS packet, and encapsulating the MPLS packet into an IP packet according to the VLAN tag in the pre-stored pseudowire PW routing table, where the VLAN tag is a user side link for identifying a client side edge device and the first network side edge device;

Decapsulating the IP packet, obtaining the TDM data stream, and sending the TDM data stream to the corresponding client-side edge device by using a user-side link identified by the VLAN tag.

Obtaining, in the pre-stored pseudo-wire PW routing table, a VLAN tag corresponding to the MPLS label carried by the MPLS packet, including:

Determining, in the PW routing table, a VLAN tag corresponding to the PW label carried in the MPLS packet;

If yes, the VLAN tag corresponding to the PW tag carried in the MPLS packet is obtained.

Optionally, the encapsulating the MPLS packet into an IP packet according to the VLAN tag includes:

The tunnel label and the PW label in the MPLS packet are stripped, and the VLAN tag is encapsulated into the MPLS packet to obtain the IP packet.

Optionally, the step of performing decapsulation processing on the IP packet to obtain the TDM data stream includes:

In the pre-saved VLAN routing table, it is found whether the VLAN tag carried by the IP packet exists.

If yes, stripping the VLAN tag, the Ethernet header, and the link layer header in the IP packet to obtain an E1 frame;

The E1 frame is multiplexed to obtain the TDM data stream.

Optionally, the VLAN tag includes a first VLAN tag and a second VLAN tag;

a second acquiring module, configured to acquire a multi-protocol label switching MPLS packet sent by the PSN network, where the MPLS packet is sent by the second network side edge device to the user from the second network side edge device to the first The TDM data stream of the network edge device is obtained by encapsulation processing;

The third processing module is configured to: obtain, in the pre-stored pseudo-wire PW routing table, a VLAN tag corresponding to the MPLS label carried by the MPLS packet, and encapsulate the MPLS packet into an IP according to the VLAN tag. a packet, the VLAN tag is used to identify a user side link established between the client side edge device and the first network side edge device;

The fourth processing module is configured to perform decapsulation processing on the IP packet, obtain the TDM data stream, and send the TDM data stream to the corresponding client side edge device by using a user side link identified by the VLAN tag.

The third processing module includes:

a second search unit, configured to: in the PW routing table, find a VLAN tag corresponding to the PW label carried in the MPLS packet;

The second obtaining unit is configured to: if the VLAN tag corresponding to the PW tag carried in the MPLS packet exists in the PW routing table, obtain a VLAN tag corresponding to the PW tag carried in the MPLS packet .

Optionally, the third processing module includes:

The fourth processing unit is configured to strip the tunnel label and the PW label in the MPLS packet, and encapsulate the VLAN tag into the MPLS packet to obtain the IP packet.

Optionally, the fourth processing module includes:

The third searching unit is configured to: in the pre-saved VLAN routing table, find whether the IP packet exists The VLAN tag carried in the text;

The fifth processing unit is configured to: if the VLAN tag carried by the IP packet exists in the VLAN routing table, strip the VLAN tag, the Ethernet header, and the link layer header in the IP packet to obtain the E1 frame;

The sixth processing unit is configured to perform multiplexing processing on the E1 frame to obtain the TDM data stream.

Embodiments of the present invention have the following beneficial effects:

The method for transmitting time-division multiplexed data in the embodiment of the present invention, the TDM data is encapsulated into an IP packet by using a VLAN tag, and then the MPLS label corresponding to the VLAN tag is obtained in the pre-stored PW routing table, and according to the MPLS label The IP packet is encapsulated into an MPLS packet to complete the TDM service encapsulation, and the TDM service is restored in the reverse process on the other side to implement the TDM service simulation. In the embodiment of the present invention, the IP packet is forwarded in the PE device by using the VLAN tag, so that the PE device does not need to reserve a certain number of PW private network labels for the TDM emulation service, thereby solving the pseudo-line label resource in the TDM service emulation technology. Insufficient problems.

DRAWINGS

FIG. 1 is a schematic diagram of a network of PWE3 in a related TDM service emulation technology;

2 is a schematic diagram showing the format of a PWE3 message in a related TDM service emulation technology;

3 is a schematic diagram showing the format of an MPLS packet in a related TDM service emulation technology;

4 is a schematic diagram of a TDM data stream package in the related art;

FIG. 5 is a schematic diagram showing decapsulation of a TDM data stream in the related art;

6 is a first working flowchart of a method for transmitting time division multiplexed data according to an embodiment of the present invention;

FIG. 7 is a schematic diagram showing the format of an IP packet of a method for transmitting time division multiplexed data according to an embodiment of the present invention;

8 is a schematic diagram of packet forwarding inside a PE device in a method for transmitting time-division multiplexed data according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of packet encapsulation in an ingress direction of a PE device in a method for transmitting time division multiplexed data according to an embodiment of the present invention;

FIG. 10 is a block diagram showing a first structure of a time division multiplexed data transmission apparatus according to an embodiment of the present invention; FIG.

11 is a second working flow chart showing a method for transmitting time division multiplexed data according to an embodiment of the present invention;

FIG. 12 is a schematic diagram showing the decapsulation of packets in the egress direction of the PE device in the method for transmitting time-division multiplexed data according to the embodiment of the present invention;

Figure 13 is a block diagram showing a second structure of a time division multiplexed data transmission apparatus according to an embodiment of the present invention;

14 is a block diagram showing the structure of a third processing module in a time division multiplexed data transmission apparatus according to an embodiment of the present invention;

15 is a block diagram showing a structure of a fourth processing module in a time division multiplexed data transmission apparatus according to an embodiment of the present invention; Figure.

detailed description

The technical problems, technical solutions, and advantages to be solved by the embodiments of the present invention will be more clearly described below in conjunction with the specific embodiments and the accompanying drawings.

In the related art, the traditional TDM service function is implemented in the PSN network through the PWE3 Layer 2 service bearer technology. Optionally, as shown in FIG. 1, the AC link (which can be a TDM link) between CE1 and CE2 is implemented on the IP/MPLS packet switching network by using PWE3 technology between PE1 and PE2. For CE1 and CE2, Said that PE1 and PE2 and IP/MPLS packet switching networks are transparent. The PE at the edge of the IP/MPLS packet-switched network encapsulates the AC link and the PW to encapsulate the TDM service, and restores the TDM service in the reverse process at the other end.

To implement the TDM data stream encapsulation and decapsulation function on the PE device, the PE device needs to support the TDM service card. The TDM service board needs to include a TDM interface module and a network processor module. According to the RFC4553/RFC5086 standard, in the ingress ingress direction, the TDM interface module encapsulates the TDM data stream received from the AC port into a PWE3 packet according to the configured PW label (private label, which is only used to forward packets inside the TDM service board). The format of the PWE3 packet in the existing TDM service emulation technology is shown in Figure 2. The TDM interface module forwards the encapsulated PWE3 packet to the network processor module. The network processor module strips the PW private network label and then encapsulates the tunnel label from the PWE3 packet received by the TDM interface module according to the configured tunnel tunnel label and the PW label (the public network label is used to forward the packet on the PSN network). And the PW public network label, the packet is a standard MPLS packet. The format of the MPLS packet in the existing TDM service emulation technology is shown in Figure 3. The encapsulated MPLS packet is forwarded to the PSN network. The TDM data stream encapsulation in the related art is shown in FIG. 4 . In the egress direction, the network processor module forwards the MPLS packet received from the PSN network to the TW interface module by first decapsulating the tunnel label and the PW public network label and then encapsulating the PW private network label. The TDM interface module strips the received PWE3 packet from the PW private network label, and sends the decapsulated TDM data stream to the AC port. The TDM data stream decapsulation process in the related art is shown in FIG. 5.

However, in the above TDM service simulation process, the PE device needs to reserve a certain number of PW private network labels for the TDM emulation service. This part of the PW private network label cannot be used on the public network, causing the resource bottleneck of the PW public network label and the PW appearing. The problem of insufficient tag resources.

Based on the above problem, an embodiment of the present invention provides a method and device for transmitting time division multiplexed data and a network side edge device, which solves the problem that the existing time division multiplexing service has insufficient pseudo line label resources in the simulation technology.

The method for transmitting time division multiplexed data in the embodiment of the present invention, as shown in FIG. 6, includes:

Step S61: Obtain time-division multiplexed TDM data that the user needs to transmit from the first network side edge device to the second network edge device, from the user side link established by the client side edge device and the first network side edge device. Streaming, and obtaining a virtual local area network VLAN tag for identifying the user side link.

Step S62: Perform encapsulation processing on the TDM data stream according to the VLAN tag to obtain an IP packet.

Step S63: Obtain a multi-protocol label switching MPLS label corresponding to the VLAN tag in a pre-stored pseudo-line PW routing table, and encapsulate the IP packet into an MPLS packet according to the MPLS label, and pass the grouping. The switching network PSN is sent to the second network edge device, and the second network edge device decapsulates the MPLS packet to obtain the TDM data stream.

The method for transmitting time-division multiplexed data in the embodiment of the present invention, the TDM data stream is encapsulated into an IP packet by using a VLAN tag, and then the MPLS label corresponding to the VLAN tag is obtained in the pre-stored PW routing table, and according to the MPLS The tag encapsulates the IP packet into an MPLS packet, completes the TDM service encapsulation, and restores the TDM service on the other side to implement the simulation of the TDM service. In the embodiment of the present invention, the IP packet is forwarded in the PE device by using the VLAN tag, so that the PE device does not need to reserve a certain number of PW private network labels for the TDM emulation service, thereby solving the pseudo-line label resource in the TDM service emulation technology. Insufficient problems.

Further, the VLAN tag includes a first VLAN tag and a second VLAN tag;

In a specific embodiment of the present invention, the TDM service board of the PE device includes two modules, that is, a TDM interface module and a network processor module, and the two are connected through an SGMII interface or an XGMII interface. The method to be implemented by the embodiment of the present invention is jointly performed by the TDM interface module and the network processor module. In order to implement the end-to-end simulation of the TDM service, the embodiment of the present invention uses a two-layer VLAN tag (private network label) to forward the Ethernet IP packet between the TDM interface module and the network processor module, and the IP of the time division multiplexing data transmission method. The packet format is as shown in Figure 7. The packet header is a custom header. The DMAC indicates the MAC address of the device and can be configured. The SMAC indicates the MAC address of the card. The MAC address can be any MAC address. The 802.1Q standard defines the format; Packet Payload represents the content of the message. For convenience of description, the embodiment of the present invention defines two layers of VLAN tags as VLAN 1 and VLAN 2. In order to implement the forwarding of the message between the TDM interface module and the network processor module, the embodiment of the present invention needs to redefine the VLAN tag. The embodiment of the present invention uses a VLAN 1 tag plus a VLAN 2 tag to uniquely identify an AC link.

As shown in Table 1, the VLAN 1 tag in the embodiment of the present invention is defined as follows:

The bit 0 to bit 5 of the VLAN 1 tag are defined as the PKT_LEN field, which is used to fill and unfill the packet. It indicates the length of the packet payload (including the link layer header and the actual content of the packet). If the PKT_LEN field is 0, Indicates that the payload length of the packet is greater than 60 bytes. Otherwise, the actual payload length of the packet except the padding field is degree. Bits 6 to 10 are defined as the ENCAP_TYPE field, indicating the packet service type (when the value of the ENCAP_TYPE field is 0xa, it indicates a TDM service packet). Bit 11 is defined as the CPU_PKT_INDICATOR field. When the value of the CPU_PKT_INDICATOR field is 0x1, it indicates that the CPU message is sent. In other cases, the value of the CPU_PKT_INDICATOR field is 0x0. Bit 12 is defined as a CFI field, a standard field. Bits 13 to 15 are defined as PRIORITY (802.1p) fields, indicating priority, and are used for scheduling.

As shown in Table 1, the VLAN 2 tag in the embodiment of the present invention is defined as follows:

The bit 0 to bit 7 of the VLAN 2 tag are defined as the CHANNEL_NO field, which indicates the number of a TDM link on the AC port. For an AC port, the value of the CHANNEL_NO field is unique. Bit 8 is defined as the AGGREGATION field. The value of the AGGREGATION field is 0x0, which indicates that the service has no aggregation attribute. The value of 0x1 indicates the service of the aggregation class attribute. For the TDM service simulation, the AGGREGATION field takes the value 0x0. Bits 9 to 11 are defined as the PORT_ID field, which indicates the number of the AC physical port. If the AC port is a PDH port, the value of the PORT_ID field is 0. If the AC port is a virtual port, the value of the PORT_ID field is 0. Bit 12 is defined as a CFI field, a standard field. Bits 13 to 15 are defined as PRIORITY (802.1p) fields, indicating priority, due to scheduling.

Table 1

Further, the step of performing the encapsulation process on the TDM data stream according to the VLAN tag to obtain an IP packet includes:

Demultiplexing the TDM data stream to obtain an E1 frame;

In a specific embodiment of the present invention, the Ethernet header may include: a destination MAC address DMAC (defined as a MAC address of a PE device) and a source MAC address SMAC (the invention is defined as any MAC address except a broadcast address) The link layer header is encapsulated according to standard RFC4385.

Further, the MPLS label includes: a PW label and a tunnel label corresponding to the PW label; and

In a specific embodiment of the present invention, after a virtual connection PW (public network PW) is created on the PE device of the PSN network, a PW label (public network label) is allocated, a tunnel tunnel is created, and a tunnel label is allocated, and the PW and the tunnel are performed. Bind. At the same time, the AC link is bound to the virtual link PW, that is, the VLAN 1/VLAN 2 label is mapped to the PW label, and the PW routing table is obtained. The PW routing table stores the PW label stored according to the corresponding relationship. The first VLAN tag, the second VLAN tag, and the tunnel tag.

Further, the encapsulating the IP packet into an MPLS packet according to the MPLS label includes:

In a specific embodiment of the present invention, as shown in FIG. 8, in the ingress direction (AC→PSN direction), the TDM interface module receives the TDM data stream from the AC port, demultiplexes the TDM data stream into an E1 frame, and The E1 frame is encapsulated into an Ethernet IP packet, and the Ethernet IP packet is forwarded to the network processor module through the SGMII interface or the XGMII interface.

The network processor module receives the Ethernet IP packet, and searches for the PW routing table according to the two-layer VLAN tag (private network label) of the Ethernet IP packet. If the corresponding tunnel label and the PW label are found, the Ethernet IP packet is stripped. The two-layer VLAN tag (the private network label) is then encapsulated with the tunnel label and the PW label. The link layer header of the Ethernet IP packet remains unchanged (the link layer header is part of the packet payload) to complete the MPLS packet encapsulation. The encapsulated MPLS packet is forwarded to the PSN network. If the tunnel tag and PW tag are not found, The Ethernet IP packet is discarded, and FIG. 9 is a schematic diagram of packet encapsulation in the ingress direction of the PE device in the method for transmitting time-division multiplexed data.

In a specific embodiment of the present invention, the first PE device encapsulates the TDM data stream into an IP packet according to the two-layer VLAN tag and forwards the packet to the network processor module, and the network processor module according to the PW label and the PW The tunnel label corresponding to the label encapsulates the IP packet into an MPLS packet and forwards the packet to the PSN network. The MPLS packet is sent by the PSN network to the second PE device, and the second PE device pairs the MPLS packet. The packet is decapsulated, and the TDM data stream is obtained to complete the TDM emulation service.

An embodiment of the present invention further provides a time-division multiplexed data transmission apparatus, which is applied to a first network side edge device, as shown in FIG. 10, and includes:

The first obtaining module 101 is configured to acquire, from the user side link established by the client side edge device and the first network side edge device, that the user needs to transmit from the first network side edge device to the second network edge device. TDM data stream, and obtaining a virtual local area network VLAN tag for identifying the user side link;

The first processing module 102 is configured to perform encapsulation processing on the TDM data stream according to the VLAN tag to obtain an IP packet.

The second processing module 103 is configured to obtain a multi-protocol label switching MPLS label corresponding to the VLAN tag in a pre-stored pseudo-line PW routing table, and encapsulate the IP packet into an MPLS packet according to the MPLS label. The packet is sent to the second network edge device by using the PSN network, and the MPLS packet is decapsulated by the second network edge device to obtain the TDM data stream.

The apparatus for transmitting time division multiplexed data according to the embodiment of the present invention, the first processing module 102 includes:

In the apparatus for transmitting time-division multiplexed data according to the embodiment of the present invention, the MPLS label includes: a PW label and a tunnel label corresponding to the PW label;

The second processing module 103 includes:

The apparatus for transmitting time division multiplexed data according to the embodiment of the present invention, the second processing module 103 includes:

It should be noted that the device and the network side edge device are devices and devices corresponding to the foregoing method embodiments, and all implementation manners in the foregoing method embodiments are applicable to the device and device embodiments, and can also achieve the same technology. effect.

In order to implement the decapsulation of the MPLS packet by the PE device according to the VLAN tag, the embodiment of the present invention further provides a method for transmitting time division multiplexed data, which is applied to the first network side edge device, as shown in FIG. include:

Step 111: Acquire a multi-protocol label switching MPLS packet sent by the packet switching network PSN, where the MPLS packet is sent by the second network side edge device to the user from the second network side edge device to the first network edge. The TDM data stream of the device is obtained by encapsulation processing;

Step 112: Obtain a VLAN tag corresponding to the MPLS label carried in the MPLS packet, and encapsulate the MPLS packet into an IP packet according to the VLAN tag in the pre-stored pseudowire PW routing table. The VLAN tag is used to identify a user side link established by the client side edge device and the first network side edge device;

Step 113: Perform decapsulation processing on the IP packet, obtain the TDM data stream, and send the TDM data stream to the corresponding client side edge device by using the user side link identified by the VLAN tag.

The method for transmitting time-division multiplexed data according to the embodiment of the present invention obtains a VLAN tag corresponding to the MPLS label carried in the MPLS packet in the PW routing table after acquiring the MPLS packet, and according to the VLAN tag, The MPLS packet is encapsulated into an IP packet, and the IP packet is decapsulated. The TDM data stream is obtained, and the MPLS packet is decapsulated. In the above process, the IP packet is forwarded in the PE device through the VLAN tag, so that the PE device does not need to reserve a certain number of PW private network labels for the TDM emulation service, which solves the problem of the pseudo-line label in the TDM service emulation technology. The problem of insufficient resources.

Further, the encapsulating the MPLS packet into an IP packet according to the VLAN tag includes:

In a specific embodiment of the present invention, as shown in FIG. 8, in the egress direction (PSN→AC direction), the network processor module receives the MPLS packet of the PSN network, and searches the PW routing table according to the PW label, if the VLAN 1 is found. And the VLAN 2 label (the private network label), the MPLS packet tunnel label and the PW label are stripped, and then the two VLAN tags (VLAN 1 label and VLAN 2 label, private network label) are encapsulated. The Ethernet IP packet is encapsulated, and the Ethernet IP packet is forwarded to the TDM interface module through the SGMII interface or the XGMII interface. If the corresponding VLAN1 and VLAN2 labels are not found, the MPLS packet is discarded.

Further, the step of performing decapsulation processing on the IP packet to obtain the TDM data stream includes:

The E1 frame is multiplexed to obtain the TDM data stream.

In a specific embodiment of the present invention, as shown in FIG. 8, in the egress direction (PSN→AC direction), the TDM interface module receives an Ethernet IP packet from the SGMII interface or the XGMII interface, and searches for a VLAN routing table. If VLAN 1 is found, The VLAN2 tag strips the Ethernet header (DMAC and SMAC) of the Ethernet packet, the two-layer VLAN tag (VLAN1 tag and VLAN2 tag), the link layer header (Control word), decapsulates the E1 frame, and then sets the E1 frame. The multiplexed into TDM data stream is forwarded to the AC port. If the VLAN 1 and the VLAN 2 label are not found, the Ethernet IP packet is discarded. FIG. 12 is a schematic diagram of packet decapsulation in the egress direction of the PE device in the method for transmitting time division multiplexed data.

The following describes the simulation process of the TDM data service in the embodiment of the present invention in combination with the above description of the encapsulation and decapsulation process of the TDM data stream.

As shown in Figure 8, in the ingress direction (AC→PSN direction), the TDM interface module receives the TDM data stream, and adds two layers of VLAN tags (private network labels) to be encapsulated into Ethernet IP packets, which are forwarded through the SGMII interface or the XGMII interface. Network processor module. The network processor module receives the Ethernet IP packet, strips the two VLAN tags, adds the tunnel label and the PW label to the MPLS packet, and forwards the packet to the PSN network.

In the egress direction (PSN→AC direction), the network processor module receives the MPLS packet, strips the tunnel label and the PW label, and adds two VLAN tags (private network labels) to be encapsulated into Ethernet IP packets, through the SGMII interface or the XGMII interface. Forward to the TDM interface module. The TDM interface module receives the Ethernet IP packet, strips the two VLAN tags of the packet, decapsulates the packet into a TDM data stream, and completes the simulation of the TDM service.

The embodiment of the present invention further provides a device for transmitting time-division multiplexed data, which is applied to the first network side edge device, as shown in FIG.

The second obtaining module 131 is configured to obtain a multi-protocol label switching MPLS packet sent by the PSN network, where the MPLS packet is sent by the second network side edge device to the user from the second network side edge device to the first a TDM data stream of a network edge device is encapsulated and processed;

The third processing module 132 is configured to: obtain a VLAN tag corresponding to the MPLS label carried in the MPLS packet, and encapsulate the MPLS packet into a VLAN tag according to the VLAN tag in a pre-stored pseudowire PW routing table. An IP packet, where the VLAN tag is used to identify a user side link established between the client side edge device and the first network side edge device;

The fourth processing module 133 is configured to perform decapsulation processing on the IP packet to obtain the TDM data. And transmitting, by the user side link identified by the VLAN tag, the TDM data stream to the corresponding client side edge device.

As shown in FIG. 14, the third processing module 132 includes:

The second searching unit 1321 is configured to: in the PW routing table, search for a VLAN tag corresponding to the PW label carried by the MPLS packet;

The second obtaining unit 1322 is configured to: if the VLAN tag corresponding to the PW label carried in the MPLS packet exists in the PW routing table, obtain a VLAN corresponding to the PW label carried in the MPLS packet label.

As shown in FIG. 14, the apparatus for transmitting time division multiplexed data according to the embodiment of the present invention, the third processing module 132 further includes:

The fourth processing unit 1323 is configured to strip the tunnel label and the PW label in the MPLS packet, and encapsulate the VLAN tag into the MPLS packet to obtain the IP packet.

As shown in FIG. 15, the apparatus for transmitting time division multiplexed data according to the embodiment of the present invention, the fourth processing module 133 includes:

The third search unit 1331 is configured to: in the pre-stored VLAN routing table, find whether the VLAN tag carried by the IP packet exists.

The fifth processing unit 1332 is configured to remove the VLAN tag, the Ethernet header, and the link layer header in the IP packet if the VLAN tag carried by the IP packet exists in the VLAN routing table. E1 frame;

The sixth processing unit 1333 is configured to perform multiplexing processing on the E1 frame to obtain the TDM data stream.

Embodiments of the present invention also provide a network side edge device including a transmission device for time division multiplexed data as described above.

It should be noted that the device and the network side edge device are devices and devices corresponding to the foregoing method embodiments. All the implementation manners in the foregoing method embodiments are applicable to the device and device embodiments, and can also achieve the same technology. effect. The network side edge devices include, but are not limited to, switches, routers, routing switches, integrated access devices (IADs), and various metropolitan area network/wide area network (MAN/WAN) devices.

One of ordinary skill in the art can understand that all or part of the above steps can be instructed by a program. The related hardware is completed, and the above program may be stored in a computer readable storage medium such as a read only memory, a magnetic disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

In an exemplary embodiment, the present invention also provides a non-transitory computer readable storage medium comprising instructions, such as a memory including instructions executable by a processor in a network side edge device to perform the above method. For example, the non-transitory computer readable storage medium described above may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Industrial applicability

The present invention is applicable to the field of communication technologies, and is used to implement the forwarding of IP packets in the PE device by using the VLAN tag, so that the PE device does not reserve a certain number of PW private network labels for the TDM emulation service.

Claims

A method for transmitting time-division multiplexed data is applied to a first network side edge device, including:

Obtaining, from the user side link established by the client side edge device and the first network side edge device, a time division multiplexing TDM data stream that the user needs to transmit from the first network side edge device to the second network edge device, and Obtaining a virtual local area network VLAN tag for identifying the user side link;

Encapsulating the TDM data stream according to the VLAN tag to obtain an IP packet;

Acquiring a multi-protocol label switching MPLS label corresponding to the VLAN tag in a pre-stored pseudo-wire PW routing table, and encapsulating the IP packet into an MPLS packet according to the MPLS label, and passing the packet switching network PSN Sending to the second network edge device, the second network edge device decapsulating the MPLS packet to obtain the TDM data stream.
The method for transmitting time-division multiplexed data according to claim 1, wherein the step of performing encapsulation processing on the TDM data stream according to the VLAN tag to obtain an IP packet comprises:

Demultiplexing the TDM data stream to obtain an E1 frame;

Adding the VLAN tag, the Ethernet header, and the link layer header to the E1 frame to obtain the IP packet.
The method of transmitting time division multiplexed data according to claim 1, wherein the MPLS label comprises: a PW label and a tunnel label corresponding to the PW label; and

Obtaining, in the pre-stored pseudo-wire PW routing table, the multi-protocol label switching MPLS label corresponding to the VLAN tag, including:

In the pre-stored PW routing table, it is found whether there is a PW label corresponding to the VLAN tag;

If yes, the PW label corresponding to the VLAN tag is obtained, and the tunnel label corresponding to the PW label is obtained.
The method for transmitting time-division multiplexed data according to claim 3, wherein the encapsulating the IP packet into an MPLS packet according to the MPLS label comprises:

Stripping the VLAN tag of the IP packet, and encapsulating the tunnel label and the PW label into the IP packet to obtain the MPLS packet.
The method for transmitting time division multiplexed data according to claim 1, wherein the VLAN tag comprises a first VLAN tag and a second VLAN tag;

The 0th-5th bit of the first VLAN tag is used to indicate the length of the packet payload, the 6th-10th bit is used to identify the packet service type, the 11th bit is used to indicate the packet transmission direction, and the 12th bit is the standard. Field, the 13th-15bit is used to indicate the priority of the packet;

The 0th-7th bit of the second VLAN tag is used to identify the number of the user side link, the 8th bit is used to identify the aggregation class attribute of the packet service, and the 9th-11th bit is used to indicate the number of the physical interface of the user side link. The 12th bit indicates the standard field, and the 13th-15bit is used to indicate the priority of the message.
A time-division multiplexed data transmission device is applied to a first network side edge device, including:

a first obtaining module, configured as a user established from the client side edge device and the first network side edge device In the side link, acquiring a TDM data stream that the user needs to transmit from the first network side edge device to the second network edge device, and acquiring a virtual local area network VLAN tag for identifying the user side link;

The first processing module is configured to perform encapsulation processing on the TDM data stream according to the VLAN tag to obtain an IP packet;

The second processing module is configured to obtain a multi-protocol label switching MPLS label corresponding to the VLAN tag in a pre-stored pseudo-line PW routing table, and encapsulate the IP packet into an MPLS packet according to the MPLS label. And sending, by the PSN network, the second network edge device, where the second network edge device decapsulates the MPLS packet to obtain the TDM data stream.
The apparatus for transmitting time division multiplexed data according to claim 6, wherein the first processing module comprises:

a first processing unit, configured to perform demultiplexing on the TDM data stream to obtain an E1 frame;

The second processing unit is configured to add the VLAN tag, the Ethernet header, and the link layer header in the E1 frame to obtain the IP packet.
The apparatus for transmitting time division multiplexed data according to claim 6, wherein the MPLS label comprises: a PW label and a tunnel label corresponding to the PW label; and

The second processing module includes:

The first searching unit is configured to: in the pre-stored PW routing table, find whether there is a PW label corresponding to the VLAN tag;

The first acquiring unit is configured to acquire a PW label corresponding to the VLAN tag, and obtain a tunnel label corresponding to the PW label, if a PW label corresponding to the VLAN tag exists in the PW routing table.
The apparatus for transmitting time division multiplexed data according to claim 8, wherein the second processing module comprises:

The third processing unit is configured to strip the VLAN tag of the IP packet, and encapsulate the tunnel label and the PW label into the IP packet to obtain the MPLS packet.
A network side edge device comprising the time division multiplexed data transmission device according to any one of claims 6-9.
A method for transmitting time-division multiplexed data is applied to a first network side edge device, including:

Obtaining a multi-protocol label switching MPLS packet sent by the packet switching network PSN, where the MPLS packet is a TDM that the second network side edge device needs to transmit from the second network side edge device to the first network edge device The data stream is obtained by encapsulation processing;

Obtaining a VLAN tag corresponding to the MPLS label carried in the MPLS packet, and encapsulating the MPLS packet into an IP packet according to the VLAN tag in the pre-stored pseudowire PW routing table, where the VLAN tag is a user side link for identifying a client side edge device and the first network side edge device;

Decapsulating the IP packet, obtaining the TDM data stream, and passing the VLAN tag The identified user side link sends the TDM data stream to the corresponding client side edge device.
The method of transmitting time division multiplexed data according to claim 11, wherein the MPLS label comprises: a PW label and a tunnel label corresponding to the PW label; and

Obtaining, in the pre-stored pseudo-wire PW routing table, a VLAN tag corresponding to the MPLS label carried by the MPLS packet, including:

Determining, in the PW routing table, a VLAN tag corresponding to the PW label carried in the MPLS packet;

If yes, the VLAN tag corresponding to the PW tag carried in the MPLS packet is obtained.
The method for transmitting time-division multiplexed data according to claim 12, wherein the encapsulating the MPLS packet into an IP packet according to the VLAN tag comprises:

The tunnel label and the PW label in the MPLS packet are stripped, and the VLAN tag is encapsulated into the MPLS packet to obtain the IP packet.
The method for transmitting time-division multiplexed data according to claim 11, wherein the step of decapsulating the IP packet to obtain the TDM data stream comprises:

In the pre-saved VLAN routing table, it is found whether the VLAN tag carried by the IP packet exists.

If yes, stripping the VLAN tag, the Ethernet header, and the link layer header in the IP packet to obtain an E1 frame;

The E1 frame is multiplexed to obtain the TDM data stream.
The method of transmitting time division multiplexed data according to claim 11, wherein the VLAN tag comprises a first VLAN tag and a second VLAN tag;

The 0th-5th bit of the first VLAN tag is used to indicate the length of the packet payload, the 6th-10th bit is used to identify the packet service type, the 11th bit is used to indicate the packet transmission direction, and the 12th bit is the standard. Field, the 13th-15bit is used to indicate the priority of the packet;

The 0th-7th bit of the second VLAN tag is used to identify the number of the user side link, the 8th bit is used to identify the aggregation class attribute of the packet service, and the 9th-11th bit is used to indicate the number of the physical interface of the user side link. The 12th bit indicates the standard field, and the 13th-15bit is used to indicate the priority of the message.
A time-division multiplexed data transmission device is applied to a first network side edge device, including:

a second acquiring module, configured to acquire a multi-protocol label switching MPLS packet sent by the PSN network, where the MPLS packet is sent by the second network side edge device to the user from the second network side edge device to the first The TDM data stream of the network edge device is obtained by encapsulation processing;

The third processing module is configured to: obtain, in the pre-stored pseudo-wire PW routing table, a VLAN tag corresponding to the MPLS label carried by the MPLS packet, and encapsulate the MPLS packet into an IP according to the VLAN tag. a packet, the VLAN tag is used to identify a user side link established between the client side edge device and the first network side edge device;

The fourth processing module is configured to perform decapsulation processing on the IP packet to obtain the TDM data stream. And transmitting, by the user side link identified by the VLAN tag, the TDM data stream to the corresponding client side edge device.
The apparatus for transmitting time division multiplexed data according to claim 16, wherein the MPLS label comprises: a PW label and a tunnel label corresponding to the PW label; and

The third processing module includes:

a second search unit, configured to: in the PW routing table, find a VLAN tag corresponding to the PW label carried in the MPLS packet;

The second obtaining unit is configured to: if the VLAN tag corresponding to the PW tag carried in the MPLS packet exists in the PW routing table, obtain a VLAN tag corresponding to the PW tag carried in the MPLS packet .
The apparatus for transmitting time division multiplexed data according to claim 17, wherein said third processing module comprises:

The fourth processing unit is configured to strip the tunnel label and the PW label in the MPLS packet, and encapsulate the VLAN tag into the MPLS packet to obtain the IP packet.
The apparatus for transmitting time division multiplexed data according to claim 17, wherein said fourth processing module comprises:

The third search unit is configured to: in the pre-saved VLAN routing table, find whether the VLAN tag carried by the IP packet exists;

The fifth processing unit is configured to: if the VLAN tag carried by the IP packet exists in the VLAN routing table, strip the VLAN tag, the Ethernet header, and the link layer header in the IP packet to obtain the E1 frame;

The sixth processing unit is configured to perform multiplexing processing on the E1 frame to obtain the TDM data stream.
A network side edge device comprising the apparatus for time division multiplexed data according to any one of claims 16-19.
A computer storage medium storing execution instructions for performing the method of any one of claims 1 to 5.