CN104270280B - LSP ping and tracert system and method is realized on the router - Google Patents

Abstract

The invention discloses a system and method for realizing LSP ping and tracert on a router, and relates to the field of network communication. The system includes a control plane and a forwarding plane, and the control plane includes an LSP ping and tracert application module, an IP protocol stack, and a control plane information module. The forwarding plane includes the forwarding plane signaling driver and the forwarding microcode, and the IP protocol stack provides a unified interface for sending and receiving packets for the LSP ping and tracert application modules; the control plane signaling driver performs MAC-IN-MAC processing on the control plane; The forwarding plane signaling driver performs MAC-IN-MAC processing on the forwarding plane. The invention submits the LSP ping and tracert messages to the forwarding plane, and the forwarding plane completes the corresponding route selection, realizes the accuracy and real-time performance of the LSP ping and tracert, and at the same time can obtain greater improvement in performance and reduce the burden on the control plane .

Description

System and method for realizing LSP ping and tracert on router

technical field

The invention relates to the field of network communication, in particular to a system and method for realizing LSP (Label Switching Path, label switching path) ping (end-to-end connectivity) and tracert (trace routing) on a router.

Background technique

In the application of MPLS (Multi-Protocol Label Switching, Multi-Protocol Label Switching), there is currently no very effective method for detecting the validity and reachability of an LSP. The MPLS system mainly includes a control plane and a forwarding plane. The control plane is responsible for establishing an MPLS forwarding path (LSP), but it cannot detect errors such as LSP transmission failures. Since the forwarding plane is based on isolated nodes, there is no way to know the situation of the upstream, downstream and the entire LSP. Therefore, a tool that allows users to detect this problem within a reasonable time is needed, so LSP ping and tracert came into being. pregnancy. The LSPping and tracert detect the connectivity of the LSP and the entire path of the LSP through an echo (echo) message (including a request and a response) based on the UDP (User Data Protocol, User Datagram Protocol).

Carrier-level networking generally has a protection scenario. In this scenario, the forwarding plane detects the active/standby state of the tunnel and realizes the switchover. The current real-time active/standby information of the tunnel is only perceived by the forwarding plane, and not immediately by the control plane. The current active and standby information causes the control plane to not know which LSP to send the LSP ping detection message to. This is another difficulty encountered in the implementation of the LSP ping and tracert functions.

In addition, when the MPLS function is implemented on the router, the MPLS forwarding function is only implemented on the forwarding plane, and the control plane does not have the MPLS soft forwarding function. The forwarding plane hardware can detect changes in the active and standby states in real time, but there is a large delay in the control plane sensing the change in the active state. During the delayed period, the active and standby states of the control plane and the forwarding plane are inconsistent.

Contents of the invention

The purpose of the present invention is in order to overcome the deficiency of above-mentioned background technology, provide a kind of system and the method that realize LSPping and tracert on the router, submit LSP ping and tracert message to forwarding plane, complete corresponding routing by forwarding plane, realize The accuracy and real-time performance of LSP ping and tracert can be greatly improved, and the burden on the control plane can be reduced.

The present invention provides a system for realizing LSP ping and tracert on a router, including a control plane and a forwarding plane, the control plane includes an LSP ping and tracert application module, an IP protocol stack and a control plane signaling driver, and the forwarding plane includes a forwarding plane Signaling driver and forwarding microcode, where:

The LSP ping and tracert application modules are used to: process the LSP ping and tracert packets at the protocol level;

Described IP protocol stack is used for: providing unified sending and receiving packet interface for LSP ping and tracert application module, is a unified sending and receiving packet platform, IP protocol stack automatically creates an operation management maintenance OAM interface, loads OAM interface driver, OAM interface driver will LSP ping and tracert messages are encapsulated into the corresponding MAC-IN-MAC format. MAC-IN-MAC is an encapsulation format used to transmit information of mutual concern between the control plane and the forwarding plane;

The control plane signaling driver is used to: perform MAC-IN-MAC processing on the control plane, encapsulate the MAC-IN-MAC header when the control plane sends a message, and peel off the MAC-IN-MAC header when the control plane receives a message ;

The forwarding plane signaling driver is used to: perform MAC-IN-MAC processing on the forwarding plane;

The forwarding microcode is used for: when the router device sends a packet, according to the LSP information carried in the MAC-IN-MAC header, search the LSP forwarding table, encapsulate the message on the LSP label header, and then encapsulate the link layer header, and finally It is sent out from the physical interface or logical interface corresponding to the LSP forwarding table; when receiving packets as a carrier edge PE node, it is sent to the signaling driver of the forwarding plane, which is uniformly encapsulated and sent to the control plane.

On the basis of the above technical solution, the IP protocol stack uses the OAM interface to send LSP ping and tracert messages.

The present invention also provides the method for realizing LSP ping and tracert on router based on above-mentioned system, comprises the following steps:

A. The router device sends LSP ping and tracert messages:

Step 101, after the control plane starts, the IP protocol stack automatically creates an OAM interface, loads the OAM interface driver, and the OAM interface driver encapsulates the LSP ping and tracert messages into a corresponding MAC-IN-MAC format, and MAC-IN-MAC is a An encapsulation format used to transfer information of mutual concern between the control plane and the forwarding plane;

Step 102, LSP ping and tracert application modules create a link original socket, bound to the OAM interface;

Step 103, when the LSP ping and tracert application modules send the LSP ping packet, the packet data part and the corresponding LSP information are encapsulated in a piece of data according to a certain format, and then sent out through the link original socket;

Step 104, the original socket of the link is used as the resource provided by the IP protocol stack for upper layer modules including LSP ping and tracert application modules, and the IP protocol stack judges whether the interface type bound to the original socket of the link is an OAM interface, if If the interface bound to the original socket of the link is an OAM interface, then go to step 105; otherwise go to step 106;

Step 105, when the IP protocol stack sends and processes the packet, if the interface bound to the original socket of the link is an OAM interface, then use the OAM interface driver loaded by the IP protocol stack to parse the original socket of the link according to the format at the time of assembly. The information carried by the LSPping and tracert message, then encapsulate the information into a message with a MAC-IN-MAC header, send it to the forwarding plane, and go to step 107;

Step 106, if the interface bound to the original socket of the link is not an OAM interface, use the driver encapsulation of other corresponding types of interfaces, and go to step 107;

Step 107, the forwarding plane signaling drives the receiving control plane to send to the forwarding plane the MAC-IN-MAC message carrying the LSP information to be detected, sends it to the forwarding microcode, and turns to step 108;

Step 108, the forwarding microcode parses the MAC-IN-MAC format, obtains LSP ping and tracert messages and the LSP information to be detected, searches the LSP forwarding table, encapsulates the MPLS label according to the LSP forwarding table, and then sends the LSP ping and tracert messages Send out from the corresponding outgoing interface;

B. The router device receives LSP ping and tracert messages:

Step 201, the forwarding plane receives LSP ping and tracert messages with TTL=0 or 1;

Step 202, after the forwarding microcode identifies the LSP ping and tracert messages, the LSP ping and tracert messages are sent to the control plane. When sending, the MAC-IN-MAC format of the LSP ping and tracert messages carries the LSP ping and tracert messages. The receiving port information of the tracert message;

Step 203: After the control plane signaling driver receives the message with the MAC-IN-MAC header, it parses out the receiving interface according to the MAC-IN-MAC header of the received message, and then strips off the MAC-IN-MAC header Afterwards, it is sent to the corresponding interface in the IP protocol stack;

Step 204, LSP ping and tracert application module create the link original socket, this link original socket is not bound OAM interface, receive LSP ping and tracert message from IP protocol stack through this link original socket, and then Perform protocol processing of the LSP ping and tracert application modules.

On the basis of the above technical solution, step 108 also includes the following steps: if the LSP to be detected has an active/standby scenario, the forwarding plane selects to send the LSP ping and tracert messages from the active LSP tunnel.

Compared with prior art, advantage of the present invention is as follows:

(1) Compared with the scene in which the control plane does not manage the real-time active/standby state of the LSP in the existing router equipment, the present invention submits the LSP ping and tracert messages to the forwarding plane, and the forwarding plane completes the corresponding route selection, and the control plane The LSPping and tracert application module cooperates with the forwarding plane to complete the encapsulation and sending of LSP ping and tracert messages, so as to realize the accuracy of LSP ping and tracert.

(2) Compared with the scene where the control plane of the existing router equipment manages LSP real-time active and standby states, the control plane obtains the LSP state of the forwarding plane and is not in time, the present invention submits the OAM message to the forwarding plane, and the MPLS label of the OAM message Relevant processing is implemented on the forwarding plane. The LSP ping and tracert application module of the control plane cooperates with the forwarding plane to complete the encapsulation and sending of LSP ping and tracert messages, which can ensure the real-time performance of LSP ping and tracert and achieve greater performance. The improvement reduces the burden on the control plane.

Description of drawings

FIG. 1 is a structural block diagram of a system for implementing LSP ping and tracert on a router in an embodiment of the present invention.

Fig. 2 is a flow chart of sending an LSP message by a router device in an embodiment of the present invention.

Fig. 3 is a flow chart of receiving an LSP message by a router device in an embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, an embodiment of the present invention provides a system for implementing LSP ping and tracert on a router, including a control plane and a forwarding plane, and the control plane includes an LSP ping and tracert application module, an IP protocol stack and a control plane signaling driver , the forwarding plane includes the forwarding plane signaling driver and forwarding microcode, where:

The LSP ping and tracert application modules are used to: process the LSP ping and tracert packets at the protocol level;

The IP protocol stack is used to: provide a unified sending and receiving packet interface for the LSP ping and tracert application modules. It is a unified sending and receiving packet platform. The IP protocol stack automatically creates an OAM (Operation, Administration, Management, operation management and maintenance) interface and loads the OAM interface Driver, the OAM interface driver encapsulates LSP ping and tracert messages into the corresponding MAC-IN-MAC format, MAC-IN-MAC is an encapsulation format used to transmit the information of mutual concern between the control plane and the forwarding plane; the IP protocol stack Use this OAM interface to send LSP ping and tracert messages;

The control plane signaling driver is used to: perform MAC-IN-MAC processing on the control plane, encapsulate the MAC-IN-MAC header when the control plane sends a message, and strip the MAC-IN-MAC header when the control plane receives a message;

The forwarding plane signaling driver is used to: perform MAC-IN-MAC processing on the forwarding plane;

The forwarding microcode is used for: when the router device sends a packet, according to the LSP information carried in the MAC-IN-MAC header, look up the LSP forwarding table, encapsulate the packet with the LSP label header, and then encapsulate the link layer header, and finally from the LSP The physical interface or logical interface corresponding to the forwarding table is sent out; when received as a PE (Provider Edge, operator's edge) node, it is sent to the signaling driver of the forwarding plane, which is uniformly encapsulated and sent to the control plane.

Embodiments of the present invention provide a method for implementing LSPping and tracert on a router based on the above system, including the following steps:

A. As shown in Figure 2, the router device sends LSP ping and tracert messages:

Step 101, after the control plane starts, the IP protocol stack automatically creates an OAM interface, loads the OAM interface driver, and the OAM interface driver encapsulates the LSP ping and tracert messages into a corresponding MAC-IN-MAC format, and MAC-IN-MAC is a An encapsulation format used to transfer information of mutual concern between the control plane and the forwarding plane;

Step 102, LSP ping and tracert application modules create a link original socket, bound to the OAM interface;

Step 103, when the LSP ping and tracert application modules send the LSP ping packet, the packet data part and the corresponding LSP information are encapsulated in a piece of data according to a certain format, and then sent out through the link original socket;

Step 104, the original socket of the link is used as the resource provided by the IP protocol stack for upper layer modules including LSP ping and tracert application modules, and the IP protocol stack judges whether the interface type bound to the original socket of the link is an OAM interface, if If the interface bound to the original socket of the link is an OAM interface, then go to step 105; otherwise go to step 106;

Step 105, when the IP protocol stack sends and processes the packet, if the interface bound to the original socket of the link is an OAM interface, then use the OAM interface driver loaded by the IP protocol stack to parse the original socket of the link according to the format at the time of assembly. The information carried by the LSPping and tracert message, then encapsulate the information into a message with a MAC-IN-MAC header, send it to the forwarding plane, and go to step 107;

Step 106, if the interface bound to the original socket of the link is not an OAM interface, use the driver encapsulation of other corresponding types of interfaces, and go to step 107;

Step 107, the forwarding plane signaling drives the receiving control plane to send to the forwarding plane the MAC-IN-MAC message carrying the LSP information to be detected, sends it to the forwarding microcode, and turns to step 108;

Step 108, the forwarding microcode parses the MAC-IN-MAC format, obtains LSP ping and tracert messages and the LSP information to be detected, searches the LSP forwarding table, encapsulates the MPLS label according to the LSP forwarding table, and then sends the LSP ping and tracert messages Send out from the corresponding outbound interface; if the LSP to be detected has a master/standby (for example, LSP1:1) scenario, the forwarding plane chooses to send out through the master LSP tunnel when sending LSP ping and tracert messages.

B, see as shown in Figure 3, router equipment receives LSP ping and tracert message:

Step 201, forwarding plane receives TTL (Time To Live, time to live)=0 or 1 LSP ping and tracert message;

Step 202, after the forwarding microcode identifies the LSP ping and tracert messages, the LSP ping and tracert messages are sent to the control plane. When sending, the MAC-IN-MAC format of the LSP ping and tracert messages carries the LSP ping and tracert messages. The receiving port information of the tracert message;

Step 203: After the control plane signaling driver receives the message with the MAC-IN-MAC header, it parses out the receiving interface according to the MAC-IN-MAC header of the received message, and then strips off the MAC-IN-MAC header Afterwards, it is sent to the corresponding interface in the IP protocol stack;

Step 204, LSP ping and tracert application module create the link original socket, this link original socket is not bound OAM interface, receive LSP ping and tracert message from IP protocol stack through this link original socket, and then Perform protocol processing of the LSP ping and tracert application modules.

Those skilled in the art can make various modifications and variations to the embodiments of the present invention, and if these modifications and variations are within the scope of the claims of the present invention and their equivalent technologies, then these modifications and variations are also within the protection scope of the present invention .

The content not described in detail in the specification is the prior art known to those skilled in the art.

Claims (4)

1. A system realizing LSP ping and tracert on a router, comprising a control plane and a forwarding plane, characterized in that: said control plane comprises a label switching path LSP ping and a tracert application module, an IP protocol stack and a control plane signaling driver , the forwarding plane includes the forwarding plane signaling driver and forwarding microcode, where: The LSP ping and tracert application modules are used to: process the LSP ping and tracert packets at the protocol level; Described IP protocol stack is used for: for LSP ping and tracert application module provide unified send and receive packet interface, is unified send and receive packet platform, IP protocol stack automatically creates an operation management maintenance OAM interface, loads OAM interface driver, OAM interface driver will LSP ping and tracert messages are encapsulated into the corresponding MAC-IN-MAC format. MAC-IN-MAC is an encapsulation format used to transmit information of mutual concern between the control plane and the forwarding plane; The control plane signaling driver is used to: perform MAC-IN-MAC processing on the control plane, encapsulate the MAC-IN-MAC header when the control plane sends a message, and peel off the MAC-IN-MAC header when the control plane receives a message ; The forwarding plane signaling driver is used to: perform MAC-IN-MAC processing on the forwarding plane; The forwarding microcode is used for: when the router sends a packet, according to the LSP information carried in the MAC-IN-MAC header, search the LSP forwarding table, encapsulate the LSP label header on the message, and then encapsulate the link layer header, and finally from the The physical interface or logical interface corresponding to the LSP forwarding table is sent out; when the carrier edge PE node receives the packet, it is sent to the signaling driver of the forwarding plane, which is uniformly encapsulated and sent to the control plane. 2. the system realizing LSP ping and tracert on router as claimed in claim 1, is characterized in that: described IP protocol stack uses OAM interface to send LSP ping and tracert message. 3. the method for realizing LSP ping and tracert on the router based on the system described in claim 1 or 2, is characterized in that, comprises the following steps: A. The router sends LSP ping and tracert messages: Step 101, after the control plane starts, the IP protocol stack automatically creates an OAM interface, loads the OAM interface driver, and the OAM interface driver encapsulates the LSP ping and tracert messages into a corresponding MAC-IN-MAC format, and MAC-IN-MAC is a An encapsulation format used to transfer information of mutual concern between the control plane and the forwarding plane; Step 102, LSP ping and tracert application modules create a link original socket, bound to the OAM interface; Step 103, when the LSP ping and tracert application modules send the LSP ping packet, the packet data part and the corresponding LSP information are encapsulated in a piece of data according to a certain format, and then sent out through the link original socket; Step 104, the original socket of the link is used as the resource provided by the IP protocol stack for upper layer modules including LSP ping and tracert application modules, and the IP protocol stack judges whether the interface type bound to the original socket of the link is an OAM interface, if If the interface bound to the original socket of the link is an OAM interface, then go to step 105; otherwise go to step 106; Step 105, when the IP protocol stack sends and processes the packet, if the interface bound to the original socket of the link is an OAM interface, then use the OAM interface driver loaded by the IP protocol stack to parse the original socket of the link according to the format at the time of assembly. The information carried in the LSP ping and tracert message of the LSP, then the information is encapsulated into a message with a MAC-IN-MAC header, and sent to the forwarding plane, and then go to step 107; Step 106, if the interface bound to the original socket of the link is not an OAM interface, use the driver encapsulation of other corresponding types of interfaces, and go to step 107; Step 107, the forwarding plane signaling drives the receiving control plane to send to the forwarding plane the MAC-IN-MAC message carrying the LSP information to be detected, sends it to the forwarding microcode, and turns to step 108; Step 108, the forwarding microcode parses the MAC-IN-MAC format, obtains LSP ping and tracert messages and the LSP information to be detected, searches the LSP forwarding table, encapsulates the MPLS label according to the LSP forwarding table, and then sends the LSP ping and tracert messages Send out from the corresponding outgoing interface; B. The router receives LSP ping and tracert messages: Step 201, the forwarding plane receives LSP ping and tracert messages with TTL=0 or 1; Step 202, after the forwarding microcode identifies the LSP ping and tracert messages, the LSP ping and tracert messages are sent to the control plane. When sending, the MAC-IN-MAC format of the LSP ping and tracert messages carries the LSP ping and tracert messages. The receiving port information of the tracert message; Step 203: After the control plane signaling driver receives the message with the MAC-IN-MAC header, it parses out the receiving interface according to the MAC-IN-MAC header of the received message, and then strips off the MAC-IN-MAC header Afterwards, it is sent to the corresponding interface in the IP protocol stack; Step 204, LSP ping and tracert application module create the link original socket, this link original socket is not bound OAM interface, receive LSP ping and tracert message from IP protocol stack through this link original socket, and then Perform protocol processing of the LSP ping and tracert application modules. 4. the method for realizing LSP ping and tracert on router as claimed in claim 3, it is characterized in that: step 108 also comprises the following steps: if the LSP to be detected has the scene of master and backup, forwarding plane is sending LSP ping and When sending tracert packets, choose to send them through the primary LSP tunnel.