WO2014029286A1 - Protection method of cross line card, relevant device, and method and system for access of line card service to ptn - Google Patents

Description

 Cross-line card protection method, related device and line card service access PTN method and system

 The present invention relates to a packet switching technology, and in particular to a method and system for implementing a cross-line card protection method, a related device, and a line card service accessing a Packet Transport Network (PTN). Background technique

 Multiplex Section Protection (MSP) is a protection mechanism for Synchronous Digital Hierarchy (SDH), which is mainly applied at the edge of the network. The MSP in the PTN is linear multiplex section protection.

 Linear multiplex section protection includes 1+1 linear multiplex section protection and 1:N linear multiplex section protection (where N is an integer greater than or equal to 1 and less than or equal to 14), and they have in common when the working path fails. Switch the service to the protection path. The difference is that the 1+1 linear multiplex section protection is that the working path and the protection path simultaneously transmit service packets, and the receiving end selects one of the service packets according to the state of the MSP group and discards another group; 1 : N linear multiplexing Segment protection is a protection path shared by N working channels. During normal operation, service packets are only transmitted in the working path. The protection path can be used to transmit additional service packets or send idle frames. When the working path fails, it is used according to the priority. The protection path transmits the service packet. Similarly, the receiving end receives the service according to the state of the MSP group.

In order to protect the stable transmission of services on line cards, MSP has been widely used. The MSP function is implemented in the packet switching network. According to the specific protection configuration mode, there are three types: line card protection, line card protection, and inter-rack protection. The protection inside the line card is mainly the protection inside the line card; the protection between the racks is mainly controlled at the protocol level, and the technologies in both aspects are relatively mature. However, the MSP technology applied between the line cards in the packet switching network, especially the scheme for accessing the PTN under the line card multiplex section protection under the line card service has not been implemented, therefore, providing a cross-line card multiplex section protection It is necessary for the line card service to access the PTN. Summary of the invention

 In view of this, the main purpose of the embodiments of the present invention is to provide a method and system for accessing a PTN across a line card protection method, a related device, and a line card service, to ensure that the line card service operates safely in the PTN network.

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

 An embodiment of the present invention provides a method for protecting a cross-line card multiplex section. The method includes: allocating a pair of internal control pseudo-line multi-protocol label switching (MPLS) on the working link and the protection link. ) tags, including internal control pseudowire uplink MPLS labels and internal control pseudowire downlink MPLS labels;

 The master switching unit generates a forwarding table according to the state of the MSP group, and performs service packet transmission through the working link and/or the protection link through the outbound port of the forwarding table + the internal control pseudowire uplink/downlink MPLS label information.

 Preferably, the master switching unit generates a forwarding table according to the state of the MSP group, and the service packet is transmitted through the working link and/or the protection link by using the outbound port of the forwarding table and the uplink/downlink MPLS label information of the internal control pseudowire. Includes:

 The master switching unit generates a forwarding table according to the state of the MSP group, and performs the service packet sent to the working line card through the working link or through the cascade port of the forwarding table by using the MPLS label of the forwarding port 1+ the internal control pseudowire. The internal control pseudowire downlink MPLS label performs service packets sent to the protection line card through the protection link;

 Or the master switching unit generates a forwarding table, and the service packet is sent through the working link and the protection link through the MPLS label of the forwarding table 1+ the internal control pseudowire downlink MPLS label and the cascade port 2+ internal control pseudowire downlink MPLS label. To work line card and protection line card;

Or the working line card and the protection line card send service packets at the same time, and the main control switching unit generates a forwarding table according to the state of the MSP group, and forwards the MPLS label or cascade through the cascade port 1+ internal control pseudo line of the forwarding table. The port 2+ internal control pseudowire uplink MPLS label performs service packets receiving the work line card or the protection line card. Preferably, the method further includes: determining whether the operation is normal, and according to the determination result, the service line card or the protection line card performs service packet transmission to the main control switching unit through the working link or the protection link.

 Preferably, the sending, by the working line card or the protection line card, the service packet to the main control switching unit by using the working link or the protection link, according to the determination result, includes:

 When the result of the determination is that the working line card is running normally, the work line card execution service message is sent to the main control switching unit through the working link;

 When the result of the determination is that the working line card is abnormal and the protection line card is running normally, the protection line card performs service packet transmission to the main control switching unit through the protection link.

 Preferably, the method further includes:

 The working line card and the protection line card detect the running status of the device in real time to obtain detection information, and send the detection information to the main control exchange unit;

 The main control exchange unit determines the state of the MSP group based on the detection information sent by the work line card and the protection line card received in real time.

 The embodiment of the present invention further provides a method for protecting a line card service to access a PTN by using an inter-line card multiplex section, where the method includes: allocating a pair of internal control pseudowire MPLS labels on the working link and the protection link;

 In the uplink direction, the working line card and/or the protection line card sends the uplink MPLS label of the service control packet to the main control switching unit, and the main control switching unit receives the service packet sent by the working line card or the protection line card, and The uplink MPLS label of the internal control pseudowire encapsulated in the service packet is exchanged into the uplink MPLS label of the pseudo-line on the network side, and the uplink MPLS label of the tunnel is encapsulated, and the processed service packet is sent to the network side;

In the downlink direction, the master switching unit strips the tunnel downlink MPLS label encapsulated in the service packet. The downlink MPLS label on the network side is switched to the downlink MPLS label of the internal control pseudowire, and the processed service packet is sent to the working line card and/or the protection line card, and the working line card and/or the protection line card receive the service report. Forward the user-side service packets.

 Preferably, the method further comprises

 In the uplink direction, the working line card and the protection line card simultaneously send service packets to the main control switching unit, and the main control switching unit generates a forwarding table according to the state of the MSP group, and selects to receive the working line card or the protection line card according to the forwarding table information. Business message

 Or the working line card or the protection line card is sent to the main control switching unit through the working line card when the working line card is running normally according to the running state of the working line card or the protection line card; when the working line card is abnormally running, the service message passes The protection line card is sent to the master switching unit.

 Preferably, the method further comprises

 In the downlink direction, the main control switching unit sends the service packet to the working line card and the protection line card;

 Or the master switching unit generates a forwarding table according to the state of the MSP group, and selects to send the service packet to the working line card or the protection line card according to the forwarding table information.

 The embodiment of the present invention further provides a line card, where the line card is used as a working line card, and the line card includes: a first detecting module, a first transceiver module, and a first label management module;

 The first detecting module is configured to detect the running status of the working line card in real time to obtain detection information, and send the detection information to the first transceiver module;

 The first transceiver module is configured to send the detection information to the main control switching unit, and is configured to send the service packet to the main control switching unit in the uplink direction, and send the service packet received from the main control switching unit to the downlink direction. User side

 The first label management module is configured to: encapsulate the internal control pseudowire uplink MPLS label on the service packet sent to the main control switching unit, and send the service packet to the first transceiver module.

Preferably, the line card further includes a first determining module configured to be in an uplink direction When the line card or the protection line card sends the service packet to the main control switching unit, the first detection module obtains the detection information to determine whether the working line card is running normally, and sends the determination result to the first transceiver module and the protection line card;

 Correspondingly, the first transceiver module is further configured to: when the determination result of the first determining module is yes, send the service packet to the main control switching unit.

 Preferably, the first transceiver module is further configured to receive a determination result of whether the protection line card is running normally. When the determination result is no, the service packet is sent to the main control exchange unit.

 The embodiment of the present invention further provides a line card, where the line card is used as a protection line card, and the line card includes: a second detection module, a second transceiver module, and a second label management module;

 The second detecting module is configured to detect the running status of the protection line card in real time to obtain detection information, and send the detection information to the second transceiver module;

 The second transceiver module is configured to send the detection information to the main control switching unit, and is configured to send the service packet to the main control switching unit in the uplink direction, and send the service packet received from the main control switching unit to the downlink direction. User side

 The second label management module is configured to: encapsulate the uplink MPLS label of the internal control pseudowire on the service packet sent to the main control switching unit, and send the service packet to the second transceiver module.

 Preferably, the protection line card further includes a second determining module, configured to determine, in the uplink direction, when the working line card or the protection line card sends the service packet to the main control switching unit, according to the detection information obtained by the second detecting module. Protecting the line card from running normally, and sending the determination result to the working line card and the second transceiver module;

 The second transceiver module is further configured to receive a determination result of whether the work line card is running normally. When the determination result is no, and the determination result of the second determination module is yes, the service packet is sent. Give the master exchange unit.

The embodiment of the present invention further provides a main control switching unit, where the main control switching unit includes: a third transceiver module, a central processing module, a switching module, and a third label management module; The third transceiver module is configured to receive the detection information of the working line card and the protection line card; and is configured to send the service packet sent by the working line card or the protection line card to the network side in the uplink direction; The service packet sent by the network side is sent to the working line card and/or the protection line card.

 The central processing module is configured to determine the state of the MSP group according to the detection information of the working line card and the protection line card received by the third transceiver module, and generate a forwarding table according to the state of the MSP group, and send a forwarding table to the switching module;

 The switching module is configured to perform switching to a working link or a protection link according to the forwarding table information;

 The third label management module is configured to exchange, in the uplink direction, the uplink MPLS label of the internal control pseudowire encapsulated by the service packet received by the third transceiver module from the work line card or the protection line card into the uplink MPLS label of the pseudowire on the network side, The tunnel MPLS label is encapsulated and sent by the third transceiver module to the network side. The downlink MPLS label encapsulated in the service packet received by the third transceiver module from the network side is stripped in the downlink direction. The downlink MPLS label switching is an internal control pseudowire downlink MPLS label, which is sent by the third transceiver module to the working line card and/or the protection line card.

 The embodiment of the present invention further provides a system for protecting a line card service from accessing a PTN by using a line card multiplex section, and the system includes: a working line card, a protection line card, and a main control switching unit according to the embodiment of the present invention. The work line card includes: a first detection module, a first transceiver module, a first label management module, and a first transceiver module; the protection line card includes: a second detection module, a second transceiver module, and a second label management Module and second decision module.

 According to the solution provided by the embodiment of the present invention, the continuity of the service transmission in the PTN network can be ensured, and the security and reliability of the service transmission are well guaranteed. DRAWINGS

1 is a schematic structural diagram of a system for accessing a PTN of a line card service under the protection of a cross-line card multiplex section according to an embodiment of the present invention; 2 is a schematic flowchart of a method for protecting a line card service from accessing a PTN by using a cross-line card multiplex section according to an embodiment of the present invention;

 FIG. 3 is a schematic flowchart of a method for a cross-line card MSP 1+1 to protect a downlink line card service from accessing a PTN according to an embodiment of the present invention;

 FIG. 4 is a schematic flowchart of a method for a line card MSP 1+1 to protect an uplink line card service from accessing a PTN according to an embodiment of the present invention;

 FIG. 5 is a schematic flowchart of a method for protecting a downlink line card service from accessing a PTN according to an embodiment of the present invention;

 FIG. 6 is a schematic flowchart of a method for protecting an uplink line card service from accessing a PTN according to an embodiment of the present invention. detailed description

 The embodiments of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments. FIG. 1 is a schematic diagram of a system for accessing a PTN of a line card service under the protection of a cross-line card multiplex section according to an embodiment of the present invention. As shown in FIG. 1, the system includes: a work line card 11, a protection line card 12, and a master control exchange. Unit 13; where:

 The line card 11 is configured to detect the running status of the device in real time to obtain the detection information, and send the detection information to the main control switching unit 13; and configured to send the uplink MPLS label of the service packet encapsulation in the uplink direction to the main control The switching unit 13 sends the service packet received from the main control switching unit 13 to the user side in the downlink direction;

 The protection line card 12 is configured to detect the running status of the device in real time and obtain the detection information, and send the detection information to the main control switching unit 13; and configured to send the uplink MPLS label of the service packet encapsulation in the uplink direction to the main control The switching unit 13 sends the service packet received from the main control switching unit 13 to the user side in the downlink direction;

The main control switching unit 13 is configured to receive the detection information sent by the working line card 11 or the protection line card 12, determine the state of the MSP group, generate a forwarding table according to the state of the MSP group, and execute the working link. Or the protection link is switched; the uplink MPLS label of the internal control pseudowire encapsulated in the service packet is switched to the uplink MPLS label of the network side in the uplink direction, and the uplink MPLS label of the tunnel is encapsulated, and the processed service is encapsulated. The packet is sent to the network side; the downlink MPLS label encapsulated in the service packet is stripped in the downlink direction, and the downlink MPLS label on the network side is switched to the downlink MPLS label of the internal control pseudowire, and the processed service packet is sent to the working line. Card 11 and/or protection line card 12;

 Here, the main control switching unit 13 is generally an application specific integrated circuit (ASIC) switching chip, which can be designed and manufactured according to the needs of the specified application; wherein the main control switching unit 13 and the working line card 11 Connected through the cascade port 1; the main control switch unit 13 and the protection line card 12 are connected through the cascade port 2;

 The information contained in the service link or the protection link between the online card and the main control switching unit 13 is an internal control pseudowire MPLS label, an Ethernet type, and a destination medium access control (Medium/Media Access Control). MAC address, source MAC address, and the like; the service packet exchanged between the master switching unit 13 and the network side includes the pseudo-line MPLS label on the network side, the tunnel MPLS label, the Ethernet type, and the virtual local area network ( Virtual Local Area Network (VLAN) information, destination MAC address, address, source MAC address, address, etc. The destination MAC address, address, and source MAC address here are because the destination MAC address and source MAC address are changed when the service packet is transmitted between the master switching unit 13 and the network side to distinguish it from the destination MAC address and the source MAC address. This is the same as the prior art and will not be described here.

 Preferably, the working line card 11 includes: a first detecting module 111, a first transceiver module 112, and a first tag management module 113; wherein:

 The first detecting module 111 is configured to detect the running status of the working line card 11 in real time to obtain detection information, and send the detection information to the first transceiver module 112;

The first transceiver module 112 is configured to send the detection information to the main control switching unit 13; it is further configured to send the service packet to the main control switching unit 13 in the uplink direction; The service packet received by the switching unit 13 is sent to the user side.

 The first label management module 113 is configured to encapsulate the internal control pseudowire uplink MPLS label on the service packet sent to the main control switching unit 13, and send the service packet to the first transceiver module 112.

 The working line card 11 further includes a first determining module 114 configured to be in the uplink direction, when the working line card 11 or the protection line card 12 sends a service packet to the main control switching unit 13, according to the first detecting module 111. The detection information determines whether the work line card 11 is operating normally, and sends the determination result to the first transceiver module 112 and the protection line card 12;

 Correspondingly, the first transceiver module 112 is further configured to send the service packet to the main control switching unit 13 when the determination result of the first determining module 114 is YES.

 The first transceiver module 112 is further configured to receive a determination result of whether the protection line card 12 is running normally. When the determination result is no, the service packet is sent to the main control switching unit 13.

 Preferably, the protection line card 12 includes: a second detection module 121, a second transceiver module 122, and a second label management module 123;

 The second detecting module 121 is configured to detect the running status of the protection line card 12 in real time to obtain detection information, and send the detection information to the second transceiver module 122;

 The second transceiver module 122 is configured to send the detection information to the main control switching unit 13; it is further configured to send the service packet to the main control switching unit 13 in the uplink direction; and receive the service received from the main control switching unit 13 in the downlink direction. The message is sent to the user side;

 The second label management module 123 is configured to encapsulate the internal control pseudowire uplink MPLS label on the service packet sent to the main control switching unit 13, and send the service packet to the second transceiver module 122.

The protection line card 12 further includes a second determining module 124 configured to be in the uplink direction, when the working line card 11 or the protection line card 12 sends a service packet to the main control switching unit 13, according to the second detecting module 121. The detection information determines whether the protection line card 12 is operating normally, and the determination result is Send to the work line card 11 and the second transceiver module 122;

 The second transceiver module 122 is further configured to receive a determination result of whether the work line card 11 is operating normally. When the determination result is no, and the determination result of the second determination module 124 is YES, the service is performed. The message is sent to the master switching unit 13.

 Preferably, the main control switching unit 13 includes: a third transceiver module 131, a central processing module 132, a switching module 133, and a third label management module 134;

 The third transceiver module 131 is configured to receive the detection information of the work line card 11 and the protection line card 12; and is configured to send the service packet sent by the work line card 11 or the protection line card 12 to the network side in the uplink direction. Sending the service packet sent by the network side to the working line card 11 and/or the protection line card 12 in the downlink direction;

 The central processing module 132 is configured to determine the state of the MSP group according to the detection information of the working line card 11 and the protection line card 12 received by the third transceiver module 131, and generate a forwarding table according to the state of the MSP group, and send the forwarding table to the switching module 133. Forwarding table

 The switching module 133 is configured to perform switching to the working link or the protection link according to the forwarding table information;

 The third label management module 134 is configured to exchange the uplink MPLS label of the internal control pseudowire encapsulated by the service packet received by the third transceiver module 131 from the line card into the uplink MPLS label of the network side, and encapsulate the tunnel at the same time. The uplink MPLS label is sent to the network side by the third transceiver module 131. The downlink MPLS label encapsulated in the service packet received by the third transceiver module 131 from the network side is stripped in the downlink direction, and the pseudowire on the network side is disconnected. The downlink MPLS label switch is an internal control pseudowire downlink MPLS label, and is sent by the third transceiver module 131 to the work line card 11 and/or the protection line card 12.

The forwarding table may be an Access Control List (ACL). The forwarding table information includes a cascade port + an internal control pseudowire uplink/downlink MPLS label, and the switching module 133 controls the cascade port 1 or the 2+ internal control pseudowire uplink/downlink MPLS label. Switching between the working link or the protection link, and controlling the third transceiver module 131 to receive the service packet sent by the first transceiver module 111 or the second transceiver module 121 in the uplink direction; or controlling the third transceiver module 131 The service packet is sent to the first transceiver module 111 and/or the second transceiver module 121 in the downlink direction.

The first detection module 111, the first label management module 113, and the first determination module 114 in the work line card 11, the second detection module 121 and the second label management module 123 in the protection line card 12 The second determining module 124, the central processing module 132, the switching module 133, and the third label management module 134 in the main control switching unit 13 may be implemented by a central processing unit (CPU) in the device. , or digital signal processor (DSP, digital signal processor), or further programmable mutli bad ^{1 J (FPGA, Field-programmable} Gate array) implemented; the working line card 11 in the first transceiver module 112, the The second transceiver module 122 in the protection line card 12 and the third transceiver module 131 in the main control switching unit 13 can be implemented by a transceiver or a transceiver antenna in practical applications.

 Based on the above system, FIG. 2 is a schematic flowchart of a method for protecting a line card service to a PTN by using a cross-line card multiplex section according to an embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:

 Step 201: The working line card and the protection line card detect their own running status in real time to obtain detection information, and send the detection information to the main control switching unit.

 Step 202: The master switching unit determines the state of the MSP group according to the received detection information sent by the working line card and the protection line card, generates a forwarding table according to the state of the MSP group, and performs switching of the working link or the protection link.

 Here, a pair of internal control pseudowire MPLS labels are allocated on the working link and the protection link, including an internal pseudowire uplink MPLS label and an internal pseudowire downlink MPLS label.

Here, the state of the MSP group includes a protocol state and a protection state. Here, the protocol state refers to the working line card running normally, and the service packet is sent to the user side or to the main control switching unit through the working line card, or the service packet passes the working line. The card and the protection line card are sent to the user side or to the main control exchange unit. When the working line card and the protection line card simultaneously send packets to the main control switching unit, the main control switching unit selects the service packet of the working line card to receive; the protection status means that the working line card runs abnormally, and the service packet can only pass the protection line. The card is sent to the user side or to the master switching unit.

 The switching of the working link or the protection link by the main control switching unit is performed by the central processing module inside the main control switching unit, and the forwarding table is generated according to the state of the MSP group, and the forwarding table is sent to the switching module to implement the switching module. The service packet is sent to the working line card and/or through the cascade port 1 through the cascade port 1+ internal control pseudowire downlink MPLS label and/or the cascade port 2+ internal control pseudowire downlink MPLS label in the forwarding table. The port 2 is sent to the protection line card.

 The service packet is transmitted in the uplink direction. Steps 203 to 204:

 Step 203: The working line card and/or the protection line card send the uplink MPLS label of the service packet encapsulation internal control packet to the main control switching unit.

 Here, the working line card and/or the protection line card sends the uplink MPLS label of the internal control pseudowire of the service packet to the main control switching unit: the working line card and the protection line card simultaneously send the service packet encapsulation internal control pseudowire uplink MPLS label The master switching unit; or the working line card determines the state of the MSP group according to the detection information obtained by the operating state of the operating line. If the state of the MSP group is the protocol state, the service packet sent from the user side is received from the working line card, and The service packet encapsulates the internal control pseudowire upstream MPLS label and sends it to the master switching unit. If the MSP group status is protected, the service packet sent from the user side is received from the protection line card, and the service packet is encapsulated into the internal control pseudowire. The uplink MPLS label is sent to the master switching unit.

 Step 204: The main control switching unit exchanges the uplink MPLS label of the internal control pseudowire of the service packet into the uplink MPLS label of the pseudowire on the network side, and encapsulates the uplink MPLS label of the tunnel, and sends the MPLS label to the network side.

Here, if the working line card and the protection line card simultaneously send the service packet to the main control switching unit, the main control switching unit generates a forwarding table according to the state of the MSP group, and uplinks the MPLS label according to the concatenation port 1+ internal control pseudo line of the forwarding table. Or cascade port 2+ internal control pseudowire uplink MPLS label information selection receiver As a service packet of the line card or the protection line card, and then performing the method described in step 204; if the service line card or the protection line card sends the service message to the main control exchange unit, the main control exchange unit selects to receive The process directly performs the method described in step 204.

 The service packet is transmitted in the downlink direction. Steps 205 to 206:

 Step 205: The main control switching unit strips the downlink MPLS label encapsulated in the service packet, and switches the downlink MPLS label of the network side to the downlink MPLS label of the internal control pseudo line, and sends the service packet to the line card.

 Here, the main control switching unit sends the service packet to the line card: the main control switching unit strips the tunnel downlink MPLS label encapsulated in the service packet, and exchanges the downlink MPLS label of the pseudo-line on the network side into the downlink MPLS label of the internal control pseudo line. The processed service packet is sent to the working line card and the protection line card at the same time; or the main control switching unit strips the tunnel downlink MPLS label encapsulated in the service packet, and the downlink MPLS label on the network side is switched to the internal control pseudo line downlink. The MPLS label generates a forwarding table according to the state of the MSP group, and sends the processed service packet to the work according to the downlink MPLS label of the forwarding table 1+ the internal control pseudowire downlink MPLS label or the cascade interface 2+ internal control pseudowire. Line card or protection line card.

 Step 206: The line card forwards the service packet of the user side.

 Here, both the work line card and the protection line card can receive the service message, or the work line card or the protection line card can receive the service message. In either case, the line card that receives the service message will perform the user. Forwarding of side service packets.

 Specifically, the protection of the cross-line card multiplex section in the packet switched network mainly includes MSP 1+1 protection and MSP 1: 1 protection. FIG. 3 to FIG. 6 respectively show an implementation process of the line card service access PTN protected by the over-line card multiplex section in the embodiment of the present invention.

Assume that the working line card and the protection line card are both Synchronous Transport Module-4 (STM-4) line cards, working line cards and the cascade port 1 of the main control switching unit, and allocate a pair of internal control pseudo Thread (pseudo wire, pw) MPLS label; protection line card and The cascade port 2 of the main control switching unit is connected, and a pair of internal control pseudowire MPLS labels are allocated. The service packet is carried by the pseudowire on the network side and enters and exits from the network side through the tunnel. If the downlink MPLS label of the tunnel is 1000, the uplink MPLS label of the tunnel is 2000, the downlink MPLS label of the pseudowire on the network side is 100, the uplink MPLS label of the pseudowire on the network side is 200, and the internal control pseudowire of the working link and the protection link is downlink MPLS. The tag is the same as 10, and the internal control pseudowire uplink MPLS label of the working link and the protection link is 20, then the implementation process of the line card multiplex section protecting the offline card service accessing PTN in the embodiment of the present invention is as follows:

 FIG. 3 is a schematic flowchart of a method for a cross-line card MSP 1+1 to protect a downlink line card service from accessing a PTN according to an embodiment of the present invention. As shown in Figure 3, the following steps are included:

 Step 301: The service packet is sent from the network side to the main control switching unit. The service packet has encapsulated the tunnel downlink MPLS label 1000 and the network side pseudowire downlink MPLS label 100.

 Step 302: The main control switching unit strips the tunnel downlink MPLS label encapsulated in the service packet, and exchanges the downlink MPLS label of the pseudowire on the network side into the downlink MPLS label of the internal control pseudowire.

 Here, the main control switching unit strips the downlink MPLS label 1000 encapsulated in the service packet, and exchanges the pseudo-line downlink MPLS label 100 on the network side into the internal control pseudo-line downlink MPLS label 10.

 Step 303: The master switching unit generates a forwarding table according to the state of the MSP group, and directs the outgoing port of the service packet to the cascade port 1 and the cascade port 2.

Here, the central processing module inside the main control switching unit generates a downlink forwarding table according to the state of the MSP group, and delivers the forwarding table to the switching module. Because it is MSP 1+1 protection, the main control switching unit simultaneously goes to the STM-4 working line. The card and the STM-4 protection line card send service packets, and the MPLS label 10 and the cascade port 2+ internal control pseudowire downlink MPLS label 10 matched by the forwarding table are matched by the forwarding table to determine the purpose of the service packet. The ports are cascade port 1 and cascade port 2. Steps 304 to 305: The main control switching unit sends the service packet to the working line card and the protection line card through the expansion port 1 and the expansion port 2, and the working line card and the protection line card receive the service packet and then perform the user side. Forwarding of service packets.

 Here, the main control switching unit sends the service packet to the STM-4 working line card through the cascade port 1, and is sent to the STM-4 protection line card through the cascade port 2, the STM-4 work line card and the STM-4. After the protection line card receives the service packet, it forwards it to the user.

 FIG. 4 is a schematic flowchart of a method for a cross-line card MSP 1+1 to protect an uplink line card service from accessing a PTN according to an embodiment of the present invention. As shown in Figure 4, the following steps are included:

 Step 401: The working line card and the protection line card encapsulate the service packet with the uplink MPLS label of the internal control pseudowire, and send it to the main control switching unit through the cascade port 1 and the cascade port 2.

 Here, the STM-4 working line card encapsulates the service packet with the internal control pseudowire uplink MPLS label 20, and sends it to the main control switching unit through the cascade port 1; the STM-4 protection line card uses the internal control uplink MPLS label 20 for the service packet. The encapsulation is sent to the main control switching unit through the cascade port 2.

 Step 402: The master switching unit generates a forwarding table according to the state of the MSP group, and selects the expansion port 1 or the cascade port 2 to receive the service packet.

 Here, the master switching unit determines whether the state of the MSP group is a protocol state or a protection state according to the detection information of the STM-4 working line card and the STM-4 protection line card received in real time, according to the state of the MSP group, the CPU inside the main control switching unit An uplink forwarding table is generated, and the forwarding table is delivered to the switching module. If the state of the MSP group is the protocol state, the master switching unit selects the service packet of the STM-4 working line card by using the uplink port 1+ internal control pseudowire uplink MPLS label 20 information matched by the forwarding table; if the MSP group status is In the protection state, the master switching unit selects the uplink MPLS label 20 information of the cascade port 2+ internal control pseudowire matched by the forwarding table, and selects to receive the service packet of the STM-4 protection line card.

Step 403 to step 404: The master switching unit exchanges the uplink MPLS label of the internal control pseudowire encapsulated in the service packet sent from the STM-4 working line card or the STM-4 protection line card to the network side pseudo The upstream MPLS label of the line encapsulates the upstream MPLS label of the tunnel and sends the processed service packet from the network side port.

 Here, after receiving the service packet sent by the STM-4 working line card or the STM-4 protection line card, the main control switching unit exchanges the uplink MPLS label 20 of the internal control pseudowire encapsulated in the service packet into the pseudo line of the network side. The MPLS label 200 encapsulates the tunnel upstream MPLS label 2000, and changes the destination MAC address and the source MAC address of the service packet, adds the VLAN information to the service packet, and sends the processed service packet from the network side port.

 FIG. 5 is a schematic flowchart of a method for protecting a downlink line card service from accessing a PTN according to an embodiment of the present invention. As shown in Figure 5, the following steps are included:

 Step 501: The service packet is sent from the network side to the main control switching unit.

 Here, the service packet enters from the Gigabit or 10 Gigabit port on the network side of the main control switching unit; the service packet has encapsulated the tunnel downlink MPLS label 1000, and the network side pseudowire line MPLS label 100.

 Step 502: The main control switching unit strips the downlink MPLS label of the tunnel, and exchanges the MPLS label of the pseudowire on the network side into the downlink MPLS label of the internal control pseudowire.

 Here, the main control switching unit strips the downlink MPLS label 1000 encapsulated in the service packet, and exchanges the pseudo-line downlink MPLS label 100 on the network side into the internal control pseudo-line downlink MPLS label 10.

 Step 503: The master switching unit generates a forwarding table according to the state of the MSP group, and directs the outbound port of the service packet to the cascade port 1 or the cascade port 2.

Here, the master switching unit determines whether the state of the MSP group is a protocol state or a protection state according to the detection information of the STM-4 working line card and the STM-4 protection line card received in real time, according to the state of the MSP group, the CPU inside the main control switching unit A downlink forwarding table is generated, and the forwarding table is delivered to the switching module. If the state of the MSP group is the protocol state, the master switching unit selects to send the service report to the STM-4 working line card by using the cascading port 1+ internal control pseudowire downlink MPLS label 10 information matched by the forwarding table. If the state of the MSP group is in the protection state, the master switching unit selects the downlink MPLS label 10 information of the cascade port 2+ internal control pseudowire matched by the forwarding table, and selects to send the service packet to the STM-4 protection line card.

 Step 504 to step 505: The main control switching unit sends the service packet to the working line card through the expansion port 1, or sends the protection line card through the expansion port 2, and the working line card or the protection line card receives the service packet. Forwards user-side service packets.

 Here, the service packet is sent to the STM-4 working line card through the cascade port 1, or sent to the protection STM-4 line card through the cascade port 2, the STM-4 work line card or the STM-4 protection line card. After the service packet is received, the user-side service packet is forwarded.

 FIG. 6 is a schematic flowchart of a method for protecting an uplink line card service from accessing a PTN according to an embodiment of the present invention. As shown in Figure 6, the following steps are included:

 Step 601: The working line card or the protection line card determines whether the working line card or the protection line card is operating normally according to the detection information obtained by the running status of the working line card or the protection line card.

 Here, the STM-4 working line card determines whether it is running normally according to the detection information obtained by its own running status. If the determination result is yes, the service message received from the user side is sent to the main control through the STM-4 working line card. If the result of the determination is no, and the protection line card determines that the protection line card is operating normally according to the detection information obtained by the operation state of the operation line, the service packet received from the user side is sent to the main exchange unit through the STM-4 protection line card. .

 Step 602: According to the determination result, the working line card or the protection line card encapsulates the service packet with the uplink MPLS label of the internal control pseudowire, and sends the processed service packet to the main control switching unit.

Here, if the STM-4 working line card is operating normally, the STM-4 working line card receives the service packet sent by the user side, and then encapsulates the service packet with the internal control pseudowire upstream MPLS label 20, and the processed packet is processed. The service packet is sent to the master switching unit. If the STM-4 line card is abnormal and the STM-4 line card is working properly, the STM-4 line card receives the service packet from the user side. The service packet is encapsulated by the internal control pseudowire upstream MPLS label 20, and the processed service packet is processed. The text is sent to the master switching unit through the STM-4 protection line card.

 Step 603: The working line card sends the service packet to the main control switching unit through the expansion port 2 through the cascade port 1 or the protection line card.

 Step 604 to step 605: The main control switching unit exchanges the uplink MPLS label of the internal control pseudowire encapsulated in the service packet encapsulated by the working line card or the protection line card into the uplink MPLS label of the network side, and encapsulates the uplink MPLS label of the tunnel. Send it out from the network side port.

 Here, after receiving the service packet sent by the STM-4 working line card or the STM-4 protection line card, the main control switching unit exchanges the uplink MPLS label 20 of the internal control pseudowire encapsulated in the service packet into the pseudo line of the network side. The MPLS label 200 encapsulates the tunnel upstream MPLS label 2000, and changes the destination MAC address and the source MAC address of the service packet, adds the VLAN information to the service packet, and sends the processed service packet from the network side port.

 The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention. Industrial applicability

 In the embodiment of the present invention, when the packet is transmitted between the main control switching device and the line card, the working line card and the protection line card are set, and the main control switching device executes the packet through the working line card and/or the protection line according to the state of the MSP group. Card transfer. It ensures the continuity of the transmission of services in the PTN network, which ensures the security and reliability of service transmission.

Claims

claims 1. A method for cross-line card multiplex section protection. The method includes: Allocate a pair of internal control pseudowire multi-protocol label switching MPLS labels to each of the working link and protection link, including internal control pseudowire upstream MPLS labels and internal control pseudowire downstream MPLS labels; The main control switching unit generates a forwarding table based on the status of the multiplex section protection MSP group, and executes service packets through the upstream/downstream MPLS label information of the forwarding table's egress port + internal control pseudo wire and transmits them through the working link and/or protection link. 2. The method according to claim 1, wherein the main control switching unit generates a forwarding table according to the MSP group status, and executes the service message through the outgoing port of the forwarding table + the upstream/downstream MPLS label information on the internal control pseudo wire by working Link and/or protection link transmission, including: The main control switching unit generates a forwarding table based on the MSP group status, and sends the downlink MPLS label execution service packets of the internal control pseudowire to the working line card through the working link through the cascade port 1+ of the forwarding table or through the cascade port 2+ of the forwarding table. The internal control pseudo wire downstream MPLS label execution service packets are sent to the protection line card through the protection link; Or the main control switching unit generates a forwarding table, and the service packets are sent simultaneously through the working link and the protection link through the cascade port 1 + internal control pseudo wire downlink MPLS label and the cascade port 2 + internal control pseudo wire downlink MPLS label in the forwarding table. To the working line card and protection line card; Or the working line card and the protection line card send service packets at the same time. The main control switching unit generates a forwarding table according to the MSP group status, and uses the cascade port 1 + internal control pseudo line in the forwarding table to uplink the MPLS label or the cascade port 2 + internal control pseudo wire. The online upstream MPLS label is used to receive service packets from the working line card or the protection line card. 3. The method according to claim 1 or 2, wherein the method further includes: determining whether it is operating normally, and based on the determination result, the working line card or the protection line card executes the service message through the working link or the protection link. Sent to the main control switching unit. 4. The method according to claim 3, wherein the working line card or The protection line card executes service packets and sends them to the main control switching unit through the working link or protection link, including: When the determination result is that the working line card is operating normally, the working line card execution service message is sent to the main control switching unit through the working link; When the determination result is that the working line card operates abnormally and the protection line card operates normally, the protection line card execution service message is sent to the main control switching unit through the protection link. 5. The method according to claim 1 or 2, wherein the method further includes: detecting the operating status of the working line card and the protection line card in real time to obtain detection information, and sending the detection information to the main control switching unit; The main control switching unit determines the MSP group status based on the detection information received from the working line card and protection line card in real time. 6. A method for connecting line card services to a packet-switched network (PTN) under multiplex section protection across line cards. The method includes: allocating a pair of internal control pseudo-wire multi-protocol label switching MPLS labels to each of the working link and the protection link. ; In the upstream direction, the working line card and/or protection line card encapsulates the service packet with the internal control pseudo wire upstream MPLS label and sends it to the main control switching unit. The main control switching unit receives the service packet sent by the working line card or protection line card, and Exchange the internal control pseudowire upstream MPLS label encapsulated on the service packet for the pseudowire upstream MPLS label on the network side, encapsulate the tunnel upstream MPLS label at the same time, and send the processed service packet to the network side; In the downstream direction, the main control switching unit strips off the tunnel downstream MPLS label encapsulated on the service packet, exchanges the pseudowire downstream MPLS label on the network side for the internal control pseudowire downstream MPLS label, and sends the processed service packet to the working line card and /or protection line card, working line card and/or protection line card forward the user-side service message after receiving the service message. 7. The method according to claim 6, wherein the method further includes: In the upstream direction, the working line card and the protection line card simultaneously send service packets to the main control switch. Unit, the main control switching unit generates a forwarding table according to the MSP group status, and selects to receive the service packets of the working line card or the protection line card according to the forwarding table information; Or the working line card or the protection line card is based on its own operating status. When the working line card is running normally, the service message is sent to the main control switching unit through the working line card; when the working line card is running abnormally, the service message is sent through The protection line card is sent to the main control switching unit. 8. The method according to claim 6 or 7, wherein the method further includes: in the downlink direction, the main control switching unit sends the service message to the working line card and the protection line card; Or the main control switching unit generates a forwarding table based on the MSP group status, and selects to send the service packet to the working line card or the protection line card based on the forwarding table information. 9. A line card, the line card serves as a working line card, and the line card includes: a first detection module, a first transceiver module and a first label management module; The first detection module is configured to detect the operating status of the working line card in real time to obtain detection information, and send the detection information to the first transceiver module; The first transceiver module is configured to send detection information to the main control switching unit; is also configured to send service messages to the main control switching unit in the uplink direction; and sends service messages received from the main control switching unit in the downlink direction. User side; The first label management module is configured to encapsulate the internal control pseudo wire upstream MPLS label on the service packet sent to the main control switching unit, and send the service packet to the first transceiver module. 10. The line card according to claim 9, wherein the line card further includes a first determination module configured to, in the uplink direction, when the working line card or the protection line card sends a service message to the main control switching unit , determine whether the working line card is operating normally based on the detection information obtained by the first detection module, and send the determination result to the first transceiver module and the protection line card; Correspondingly, the first transceiver module is further configured to send the service message to the main control switching unit when the determination result of the first determination module is yes. 11. The line card according to claim 9, wherein the first transceiver module is further configured to receive a determination result of whether the protection line card is operating normally, and when the determination result is no, send the service message to Sent to the main control switching unit. 12. A line card, the line card serves as a protection line card, and the line card includes: a second detection module, a second transceiver module and a second label management module; The second detection module is configured to detect the operating status of the protection line card in real time to obtain detection information, and send the detection information to the second transceiver module; The second transceiver module is configured to send detection information to the main control switching unit; is also configured to send service messages to the main control switching unit in the uplink direction; and sends service messages received from the main control switching unit in the downlink direction. User side; The second label management module is configured to encapsulate the internal control pseudo-wire upstream MPLS label on the service message sent to the main control switching unit, and send the service message to the second transceiver module. 13. The line card according to claim 12, wherein the protection line card further includes a second determination module configured to, in the uplink direction, when the working line card or the protection line card sends a service message to the main control switching unit When, determine whether the protection line card is operating normally based on the detection information obtained by the second detection module, and send the determination result to the working line card and the second transceiver module; The second transceiver module is also configured to receive a determination result of whether the working line card is operating normally, and when the determination result is no and the determination result of the second determination module is yes, send the service message. to the main control switching unit. 14. A main control switching unit, the main control switching unit includes: a third transceiver module, a central processing module, a switching module and a third label management module; The third transceiver module is configured to receive detection information of the working line card and the protection line card; and is also configured to send the service packets sent by the working line card or the protection line card to the network side in the uplink direction; and in the downlink direction. Service packets sent from the network side are sent to the working line card and/or protection line card; The central processing module is configured to receive the working line card and the protection data according to the third transceiver module. The detection information of the line protection card determines the MSP group status, generates a forwarding table based on the MSP group status, and delivers the forwarding table to the switching module; The switching module is configured to perform switching of the working link or the protection link according to the forwarding table information; The third label management module is configured to exchange the internal control pseudo-wire upstream MPLS label encapsulated in the service message received by the third transceiver module from the working line card or the protection line card into a pseudo-wire upstream MPLS label on the network side in the upstream direction, At the same time, the tunnel upstream MPLS label is encapsulated and sent to the network side by the third transceiver module; it is also configured to strip the tunnel downstream MPLS label encapsulated on the service packets received by the third transceiver module from the network side in the downstream direction, and remove the pseudo network side MPLS label. The offline downlink MPLS label is exchanged for the internal control pseudo line downlink MPLS label, which is sent by the third transceiver module to the working line card and/or protection line card. 15. A system for connecting line card services to PTN under multiplex section protection of line cards. The system includes: a working line card, a protection line card and the main control switching unit according to claim 14; the working line card The protection line card includes the line card according to any one of claims 9 to 11; the protection line card includes the line card according to claim 12 or 13.