WO2008086641A1

WO2008086641A1 - A protection method of the speakers of the interdomain protocol in the optical network

Info

Publication number: WO2008086641A1
Application number: PCT/CN2007/000014
Authority: WO
Inventors: Desheng Sun; Zhe Wang
Original assignee: Zte Corporation
Priority date: 2007-01-04
Filing date: 2007-01-04
Publication date: 2008-07-24
Also published as: CN101427531B; CN101427531A

Abstract

There is a protection method used in the speakers of the interdomain protocol in the optical netwrok. In the step S102, a master speaker and a backup speaker in the domain are chosen, each of which gathers the node information and routing information in the domain and performs inter-layer communication. In the step S104, the master speaker establishes communication with the backup speaker, and performs routing information critical data backup and status backup. In the step S106, the master speaker and the backup speaker check the living status of each other. If the backup speaker detects the fault of the master speaker, it becomes into the new master speaker and a new backup speaker is chosen, then return to the step S104. If the master speaker detects the fault of the backup speaker, a new backup speaker is chosen, then return to the step S104. If fault doesn't appear in both speakers, then repeat the step S106. The speakers can be efficiently protected, rapidly switched. And the algorithm is less complicated, compact and reliable.

Description

I speak point optical network protection and backup protection method relates to optical network protocol endorsement BACKGROUND point of the present invention in particular relates to a method of protecting ^ stay between optical network domain protocol for _a point 4 or between words. BACKGROUND OF THE INVENTION Optical networks, such as OTN (Optical Transmission Network), WDM (Wavelength-division multiplexing), SDH (Synchronous Digital Hierarchy), or SONET (Synchronous Optical Network) The transmission network has been widely used in the field of telecommunications. Automatic switched optical network (ASON) refers to a new generation optical network that performs automatic switching under the control of routing and signaling. It is a research hotspot in the field of optical networks in recent years. The introduction of ASON technology can enhance the rapid configuration capability of network services, improve the survivability of services, effectively resist multiple network faults, and flexibly provide different service levels to meet the needs of rapidly developing differentiated services. The ITU-T G.8080 and G.771X series recommendations propose the concept and implementation architecture of ASON. With the gradual deployment of ASON networks, networks of different operators and different equipment vendors will be interconnected through an external network network interface (Jean E-NNI). These networks interconnected by E-NNI will act as independent routing domains. On the one hand, from the application point of view, the connection in the optical network is relatively fixed, and does not need to be frequently established and deleted, so routing information, especially inter-domain routing information, is not necessarily required on each network node device. In addition, for management and security reasons, operators generally apply related policies between domains to control the exchange of routing information. However, for the same carrier or the same equipment provider's network, all devices are interconnected through an internal network network interface (I-NI). In the same i or in, the ASON network uses the open shortest path first (OSPF) protocol for node routing maintenance. However, considering the complexity of efficiency, route management and maintenance, it is often necessary to divide into several sub-routing domains. In this way, how to work together for multiple routing domains and complete routing calculation and maintenance from the perspective of the entire network is very important. ITU-T G.7715 and OIF2003.259.00/2002.023.10 specify the ASON network inter-domain routing protocol (Domain to ― Domain Routing Protocol (DDRP) architecture, which summarizes and summarizes the routing information by layering and abstracting the routing domain, and introduces the endorsement point (SPEAKER) to solve the problem, which is conducive to network expansion.

SPEAKER aggregates the node information and routing information of the routing domain, and notifies the SPEAKER of the previous layer or the next layer. In this way, different layers of SPEAKER can get the node reachable information of the whole network, which solves the problem that OSPF cannot cross domain.

The status of SPEAKER is very important. If there is only one SPEAKER in a domain, if the SPEAKER fails, the routing query function and information interaction between the layers are completely interrupted. The DDRP protocol needs to re-elect SPEAKER, and perform a series of maintenance operations such as flooding related information, which takes a long time and is efficient. ^ ^. At this time, if the connection recovery is completed through a routing protocol, the service recovery time is greatly extended. Therefore, a technical solution is needed to enable perfect SPEAKER protection. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a method for protecting an inter-domain protocol end point of an optical network, which is used to solve the SPEAKER protection problem in the existing DDRP protocol. In order to achieve the above object, the present invention provides a protection method for an inter-domain protocol end point of an optical network. The protection method includes the following steps: Step S102: Elect the primary endorsement point and the backup endorsement point in the domain, and the primary endorsement point and the backup endorsement point respectively aggregate node information and routing information of the domain, and perform inter-layer communication; Step S104, A communication connection is established between the primary endorsement point and the backup endorsement point, and is used for entering the key data backup and the state backup of the routing information. Step S106, the primary endorsement point and the backup endorsement point mutually detect each living state through the communication connection. If the backup endorsement point detects that the primary endorsement point is faulty, the backup endorsement point becomes the new primary endorsement point, elects a new backup endorsement point, and returns to step S104, if the primary endorsement point detects that the backup endorsement point appears If the fault occurs, a new backup endorsement point is elected, and the process returns to step S104. If no fault is detected, step S106 is repeatedly executed. In step S102, electing the primary endorsement point and the backup endorsement point may include the following steps: Step a, configuring the candidate qualifications of each node, including being eligible to become the primary endorsement point, qualifying as a backup endorsement point, or not qualified; step b, after establishing a two-way communication connection between the node and the node, each node is separately listed All the nodes that may become the primary endorsement point and the backup endorsement point, and then each node declares that it is the primary endorsement point, or the backup endorsement point, or does not speak according to the candidate qualification, if no node declares itself as the main To use the endorsement point or backup endorsement point, go to step e; Step c, in the list of nodes that are eligible to become the primary endorsement point, create a subset that has not been declared to be the primary endorsement point; If multiple nodes declare that they are the primary endorsement points, then the node with the highest priority becomes the primary endorsement point. If the priorities are equal, the final primary endorsement point is determined by comparing other attributes. Step e, select the node with the highest priority as the primary endorsement point, if the priority is equal, compare the other attributes to determine the final primary generation Point; step f, in the list of nodes in all eligible to be the backup endorsement point, create a subset that has not been declared as a backup endorsement point; step g, if one or more nodes declare that they are backup endorsement points, then The node with the highest priority becomes the backup end point. If the priorities are equal, the final backup end point is determined by comparing other attributes, and the process ends. Step h, select the node with the highest priority as the backup end point, if the priorities are equal Compare the other attributes to determine the final backup endorsement point. The other attributes mentioned above may include a node identifier and an IP address. In step S106, the primary endorsement point and the backup endorsement point detect each other's survival state by the following steps: Step P1, the primary endorsement point starts the first timer, and is used for the tracking detection to issue a status query. The interval of the message, backup ^ (the rumor point starts the second timer, used to detect whether there is a query or command from the main 4 rumor point when the rule is specified; Step , 2, if the first timer arrives first , then go to step ,3, if the second timer When the first time arrives, the process proceeds to step P6; in step P3, the primary endorsement point sends a message to the backup endorsement point, queries the status of the backup endorsement point, and starts a third timer for querying whether the response time of the backup endorsement point times out, and The first timer is suspended; in step P4, if the backup end point receives the query information of the primary endorsement point, the backup end point sends a response, and the second timer is reset, indicating that the query message has been received within the specified time. P5, if the primary endorsement point receives the response message of the backup endorsement point before the third timer expires, the primary endorsement point closes the third timer, indicating that the response message is received at the specified time, and if the message is represented If the status of the backup endorsement point is normal, the primary endorsement point resets the first timer, indicating that the backup endorsement point is normal, and returns to step P1. If the third timer expires, the response has not been received or the received response indicates that the backup is performed. If the endorsement point is wrong, the main endorsement point does not restore the first timer, and it is judged that the main endorsement point is faulty, the detection is suspended, and the execution is suspended. Switching; - Step P6, the backup endorsement point sends a message to query the status of the primary endorsement point, suspends the second timer, and starts a fourth timer to monitor the response of the primary endorsement point; step P7, if at the fourth timing Before the device arrives, the backup endorsement point receives the response message of the main endorsement point, and the message shows that the main use ^ is all normal, then the backup endorsement point closes the fourth timer, restores and restarts the second timer, returns to Step P1, otherwise it is determined that the backup endorsement point is faulty, the detection is suspended, and the switching is performed. In step S106, the backup endorsement point becomes a new primary endorsement point, and the election of the new backup endorsement point may include the following steps: Step T1, the backup endorsement point first checks the database of the primary backup endorsement point of the local backup; Step T2, if the backup If the database in the endorsement point is valid, the backup endorsement point sends a message stating that it is the endorsement point to the existing node, and waits for the reply of the other node, if it is invalid, proceeds to step S102; Step ,3, receives a reply from the other network node In the future, the backup endorsement point changes its state and sets its own state as the new primary endorsement point; 07 000014 Step T4, the new primary endorsement point sends an update message to other nodes in the network, waiting for the database update; Step Τ5, the new primary endorsement point issues a backup endorsement node election message, and re-schedules the election of 4 rumors . Electing a new backup endorsement point can include the following steps: In a list of nodes that are eligible to be a backup endorsement point, create a subset that has not been declared a backup endorsement point; if one or more nodes declare themselves to be backup endorsements Point, then the node with the highest priority becomes the backup end point. If the priorities are equal, the final backup end point is determined by comparing other attributes, and the process ends; select the node with the highest priority as the backup end point, if the priorities are equal Compare the other attributes to determine the final backup endorsement point. The above other attributes can be used to identify and IP addresses. The optical network described above includes, but is not limited to, an automatically switched optical network. The above inter-domain protocols include, but are not limited to, inter-domain routing protocols. When the primary endorsement point or the backup endorsement point fails in different domains, the primary and secondary endorsement point switching protections are independently performed in different domains. Through the above technical solution, the present invention can implement the effective protection of the SPEAKER in the DDRP protocol, and the switching is fast, which can effectively reduce the probability of interruption of the service of the entire domain due to the failure of the SPEAKER node alone, and is compatible with the standard DDRP protocol, and the algorithm complexity is small. It has the advantages of simplicity and reliability. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawing: 1 is a flow chart of a method for protecting an inter-domain protocol end point of an optical network according to the present invention; FIG. 2 is a schematic diagram of a network organization structure according to an embodiment of the present invention; FIG. 3 is a hierarchical network according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a network situation when SPEAKER and backup SPEAKER are faulty according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a network after performing a switching according to an embodiment of the present invention; 6 is a schematic diagram of an update process of information interaction between the active and standby SPEAKERs in the domain according to an embodiment of the present invention; FIG. 7 is a schematic flowchart of operations performed by the primary SPEAKER node according to an embodiment of the present invention; Schematic diagram of the action flow performed by the primary SPEAKER node after the failure of the backup SPEAKER; and FIG. 9 is a flowchart of the entire technical solution according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. Referring to the figure, the protection method for the inter-domain protocol end point of the optical network according to the present invention includes the following steps: Step S102: Elect the primary endorsement point and the backup end point in the domain, and the primary endorsement point and the backup endorsement point respectively converge the domain Node information and routing information, and perform inter-layer communication; Step S104, establishing a communication connection between the primary endorsement point and the backup endorsement point, for performing routing data key data backup and state backup; Step Silver S106, main use The point and the backup endorsement point mutually detect each other's living state through the communication connection. If the sub-secret point detects that the main endorsement point has failed, the backup endorsement point becomes the new primary endorsement point, and a new backup endorsement point is elected. Returning to step S104, if the main endorsement If the point detection fails, the new backup endorsement point is elected, and the process returns to step S104. If no failure is detected, then step S106 is repeatedly executed. In step S102, the election of the primary endorsement point and the backup endorsement point may include the following steps: Step a: Configuring the qualification qualification of each network element, including being eligible to become the primary endorsement point, qualifying as a backup endorsement point, or not qualified Step b, after establishing a two-way communication connection between the node and the node, each node lists a list of all the network elements that may become the primary endorsement point and the backup endorsement point, and then each network element declares itself according to the qualification of the candidate. Use the endorsement point, or backup endorsement point, or do not speak. If there is no network element to declare its own endorsement point or backup endorsement point, then go to step-慷e; step c, all qualified to become the main endorsement In the list of network elements in the point, create a subset that has not been declared to be the primary endorsement point; Step d, if one or more network elements declare that they are the primary use, the network with the highest priority The element becomes the primary endorsement point. If the priorities are equal, the final primary endorsement point is determined by comparing other attributes, proceeding to step f; step e, selecting the highest priority The network element is used as the main control point. If the priorities are equal, the other attributes are compared with other attributes to determine the final primary endorsement point. Step f, in the list of all the NEs eligible to be the backup endorsement point, create a backup that has not been declared as a backup. a subset of the endorsement points; Step g, if one or more network elements declare that they are backup endorsement points, then the network element with the highest priority becomes the backup endorsement point, and if the priority is equal, the final backup is determined by comparing other attributes. Endorsement point, the process ends; Step h, select the network element with the highest priority as the backup endorsement point, if the priority is equal, compare the other attributes to determine the final backup endorsement point. The other attributes mentioned above may include a node identifier and an IP address. In step S106, detecting the respective living states between the primary endorsement point and the backup endorsement point may include the following steps: • In step PI, the primary endorsement point starts a first timer, which is used to track the time interval for detecting the status inquiry message, and the backup end point starts a second timer for detecting whether there is a query or a command from the primary endorsement within a specified time. Step P2, if the first timer first arrives, then proceeds to step P3, if the second timer first arrives, then proceeds to step 3 to gather P6; step P3, the primary endorsement point sends a message to the backup endorsement point, Querying the status of the backup endorsement point, and starting a third timer, for querying whether the response time of the backup endorsement point times out, and suspending the first timer; Step P4, if the backup endorsement point receives the query information of the primary endorsement point, Then, the backup end point sends a response, and the second timer is reset, indicating that the query message has been received internally within the specified time; Step P5, if the third end of the timer expires, the primary endorsement point receives the response of the backup endorsement point. In the message, the primary endorsement point closes the third timer, indicating that the response message is received at the specified time, and if the message indicates a backup generation If the point status is normal, the primary endorsement point resets the first timer, indicating that the backup endorsement point is all normal, and returns to step P1. If the third timer expires, the response has not been received or the received response indicates the backup endorsement point. If the error occurs, the main endorsement point does not restore the first timer, it is judged that the main endorsement point is faulty, the detection is suspended, and the switching is performed; Step P6, the backup endorsement point issues a message to query the status of the main endorsement point, and the second timer is suspended. And starting the fourth timer to monitor the response of the primary endorsement point; Step P7, if the backup end point receives the response message of the primary endorsement point before the fourth timer expires, and the message displays the primary endorsement message If everything is normal, the backup 4 will close the fourth timer, resume and restart the second timer, and return to step P1. Otherwise, it is judged that the backup end point is faulty, pause the test, and perform the switching. In step S106, the backup endorsement point becomes a new primary endorsement point, and the election of the new backup endorsement point may include the following steps: Step T1, the backup endorsement point first checks the database of the primary backup endorsement point of the local backup; Step T2, if the backup If the database in the endorsement point is valid, the backup endorsement point sends a message stating that it is the endorsement point to the existing node, and waits for the reply of other nodes. If invalid, then T/CN2007/000014

- Go to step S102; Step T3, after receiving the reply from the other network node, the backup end point changes its state, and sets its own state as the new primary endorsement point; Step T4, the new primary endorsement point Other nodes in the network issue update messages, waiting for the database to be updated; Step T5, the new primary endorsement point issues a backup endorsement point node election message, and re-schedules the election of the 4 rumors. Electing a new backup endorsement point may include the following steps: In a list of all NEs eligible to be a backup endorsement point, create a subset that has not been declared a backup endorsement point; if one or more network elements declare themselves to be Back up the endorsement point, then the network element with the highest priority becomes the backup end point. If the priority is equal, the final backup 4 point is determined by comparing other attributes, and the process ends; select the network element with the highest priority as the backup end point. If the priorities are equal, compare the other attributes to determine the final backup endorsement point. Other attributes described above may include, but are not limited to, a node identification and an IP address. The optical network described above includes, but is not limited to, an automatically switched optical network. The above inter-domain protocols include, but are not limited to, inter-domain routing protocols. When the primary endorsement point or the backup endorsement point fails in different domains, the primary and secondary endorsement point switching protections are independently performed in different domains. The present invention relates to the field of optical networks, and particularly relates to an active/standby protection method for an endorsement point in an inter-domain protocol of an ASON network, and is also applicable to an inter-domain protocol end point protection of a data network. Figure 2 illustrates the situation of the network node and the network structure. For the two ASON network domains and nodes, the number in the node identifier is the ID number, as is the ID of the other figures. The main and standby SPEAKER node elections in Figure 3 have been completed, the square is SPEAKER, and the second diamond PT/CN2007/000014 is the alternate SPEAKER. The internal Ni l of CD1 in Figure 4 fails, causing the main SPEAKER to not work properly, and the internal N22 of CD2 fails, causing the backup SPEAKER to not work properly. The two faults of CD1 and CD2 are completely independent and have no interaction. The SPEAKER active/standby protection technical solution of the present invention mainly comprises the following parts, including the election of SPEAKER in the domain, the information exchange between the active and standby SPEAKER, the protection switching of the active and standby SPEAKER, and the new backup SPEAKER election. Further, the technical solution of the present invention includes the following technical steps: In the first step, the DDRP protocol is started, and the election of the SPEAKER is completed while completing the main SPEAKER election in the domain. In the second step, the primary and backup SPEAKER respectively perform routing information summarization of the routing domain in which it is located, and the inter-layer communication function (feed up and feed down) of the corresponding routing i or. The third step is to establish a communication link between the active and standby SPEAKER. The active and standby SPEAKERs communicate with each other through this communication to perform routing information key data and status backup. In the fourth step, the active and standby SPEAKERs communicate with each other to detect their respective living states. The test result shows that if the main SPEAKER fails, it goes to the fifth step; if the standby SPEAKER fails, it goes to the sixth step; otherwise, it continues to Φ. In the fifth step, after the backup SPEAKER detects the failure of the main SPEAKER, the backup SPEAKER starts and executes the related functions of the main SPEAKER. Prepare SPEAKER as the new main SPEAKER^ Step 6. In the first step, re-elect SPEAKER in this domain. The process moves to the fourth step in the four protocols. In particular, the first step in the technical solution regarding the election scheme of the primary SPEAKER and the standby SPEAKER further includes the following steps: Step 1. Each node is powered on, the DDRP protocol on the node is started, and each ASON is configured through a network management or other means. The qualification of the network element, including the qualification to become the main SPEAKER, is eligible to be a backup SPEAKE or not qualified. 2007/000014 Step 2: After establishing a two-way communication connection between the node and the node, each node lists all the AS ON NEs that may become SPEAKER and backup SPEAKER, and then each ASON NE is configured according to step 1. In the qualification situation, declare that you are the main SPEAKER or SPEAKER or do not speak. If no ASON NE declares itself as the primary or backup SPEAKER, go to step 5, otherwise 4 will proceed to the next step. Step 3. In the list of ASON NEs that are eligible to become the primary SPEAKER, create a subset that has not been declared SPEAKER. Step 4: If one or more ASON network elements declare that they are the primary SPEAKER, the ASON network element with the highest priority becomes the primary SPEAKER network element. If the priorities are equal, the final primary SPEAKER network element is determined by comparing other attributes. The process ends. Step 5: Select the ASON network element with the highest priority as SPEAKER. If the priorities are equal, determine the final SPEAKER network element according to the other attributes described in step 4. The process ends. Specifically, other attributes described in step 4 include an identifier of an ASON node, an IP address, or other related parameters. It can be configured in advance as a strategy in step 1. In particular, in the same manner, by repeating steps 3 to 5 of the above technical steps, the election of SPEAKER can be completed. After the main SPEAKER and backup SPEAKER elections are completed, the primary SPEAKER performs layer-to-layer communication of information and summarizes related routing information as described in the second step of the technical solution.

The communication and key between the active and standby SPEAKER described in the third step of the four schemes: data backup is shown in Figure 6. Figure 6 illustrates the process of querying each other's status between the active and standby SPEAKERs in the domain, and the operation flow of switching when the backup speaker fails. At the same time, Figure 6 shows the information exchange update process between the active and standby SPEAKERs in the domain. The fourth step in the technical solution includes the mutual detection between the active and standby SPEAKER and the corresponding processing flow. In particular, the fourth step in the technical solution about the main SPEAKER and the standby SPEAKER mutual detection of the respective survival state scheme includes the following specific steps: Step 1, the main SPEAKER starts a specific timer (a "set to timer 1") Traces the interval at which status messages are sent. 4 Step 2, synchronized with step 1, the standby SPEAKER start timer in step 2 (assumed to be timer 2) is responsible for detecting whether there is a query or command from the main SPEAKER within the specified time. In this position, if the timer 1 of the primary SPEAKER first arrives, the process proceeds to step 3. If the timer 2 of the backup SPEAKER first arrives, the process proceeds to step 6. Step 3: According to the timer of step 1, if the primary SPEAKER timer expires, the primary SPEAKER sends a message to the backup SPEAKER to query the status of the backup SPEAKER, and the primary SPEAKER starts a timer (timer 3) ) Responsible for querying whether the response time of the backup SPEAKER is timed out. Timer 1 is also suspended. Step 4: According to step 3, if the backup SPEAKER receives the query information of the primary SPEAKER, the backup SPEAKER sends a response, and at the same time resets the timer 2, indicating that the query has been received internally within the specified time. Step 5: According to step 4, before the timer 3 expires, the primary SPEAKER receives the response message of the backup SPEAKER, then the primary SPEAKER closes the timer 3, indicating that the response message is received at the specified time, and if the message is represented If the backup SPEAKER status is normal, the primary SPEAKER resets the timer 1 to indicate that the backup SPEAKER is normal. In this case, return to step 1 if the timer 3 expires. Have not received or received. The response should indicate a backup SPEAKER error. At this time, the primary SPEAKER does not resume the timer 1 timer. According to the second step in the technical solution, it is necessary to enter the sixth step of the technical solution. The detailed process of this part is shown in Figure 8. Step 2, Step 2 If the backup SPEAKER timer expires. When the timer 2 expires, the backup SPEAKER issues a message to query the status of the primary SPEAKER, and the timer 2 is paused to start the timer (assumed to be timer 4) to monitor the response of the primary SPEAKER. Step 7. According to step 6, if the backup SPEAKER receives the response message of the primary SPEAKER before the timer 4 expires, and the message shows that the primary SPEAKER is normal, the backup SPEAKER closes the timer 4, restores and restarts the timer. 2. At this point, the state of the entire solution is restored to step 1, otherwise it enters the fifth step of the technical solution. The specific process is shown in Figure 7. Figure 7 shows the action flow of the standby SPEAKER node discovering the failure of the primary SPEAKER. In particular, according to the fifth step in the technical solution, the following technical steps are included: Step 1. The backup SPEAKER first checks the database of the primary SPEAKER of the local backup. Step 2. According to the result of step 1, if the database in the backup SPEAKER is valid, the backup SPEAKER will send a message stating that it is SPEAKER to the existing node. And wait for a reply from other nodes. Go to the processing of step 3. If it is invalid, return to the first step in the technical solution and re-elect SPEAKER. Step 3. After receiving the reply from other network nodes according to the result of step 2, back up

SPEAKER will change its state and set its own state to be SPEAKER. After step 4 and step 3 are completed, the primary SPEAKER sends an update message to other nodes in the network. Waiting for a database update. After step 5 and step 4 are completed, the main SPEAKER will issue a backup SPEAKER node election message, and re-schedule the SPEAKER election. Step 6. See the detailed steps of the backup SPEAKER election in the first step of the technical solution. The above steps are shown in Figure 9. Embodiment 1 : In conjunction with FIG. 2 and FIG. 3, the specific implementation scheme of the first step of electing the active and standby SPEAKER in the technical solution is described in detail by taking the election of the main SPEAKER as an example: First step, according to step 1 of the first step of the technical solution Two domains, CD1 and CD2, are formed. The network diagram is shown in Figure 2. Then each network element is powered on, and each network element in CD1 and CD2 claims to be the primary SPEAKER - the second step, the nodes establish a two-way connection by sending data packets, each node establishes a database, and the database contains all the declarations. For the main SPEAKER node, according to Figure 2, all nodes claim to be the main SPEAKER, the third step, create a subset that has not yet declared SPEAKER, the subset is empty. In the fourth step, in this step, it is assumed that the node ID number has the lowest priority, so the node Nl 1 in CD1 and the node N21 in CD2 become the main SPEAKER of the respective domains. In the same way, N12 and N22 is the backup SPEAKER inside the respective domain. The election of the SPEAKER node in the network is completed. The figure of the election is shown in Figure 3. 4 Example 2: In conjunction with FIG. 3 and FIG. 6, the detection procedure of the backup SPEAKER Nl 2 has been selected by taking the main SPEAKER Ν1Γ in the domain CD1 of the embodiment 1 as an example, and the mutual detection of the SPEAKER in the technical solution is specifically described: In one step, the Nil NE starts timer 1, and the N12 NE starts timer 2. In the second step, when the Nil timer expires, the timer 1 is paused and the next step is taken. In the third step, the Nil network element sends a status query message to N12. At the same time, the Nil NE starts timer 3. In the fourth step, before the timer 3 expires, the Nil network element receives the N12 response successfully, and the Nil network element turns off the timer 3. In the fifth step, the Nil network element resets the timer 1 and restarts the next round of timing. At this point, the main step of using SPEAKER to detect the backup SPEAKER has been completed. Go to the next step. In the sixth step, continue, when the N12 network element timer 2 expires, the timer 2 is suspended, the Nil state is queried, and the timer 4 is started. In the seventh step, before the timer 4 expires, the N12 network element receives the normal status response message of the Nil network element, and turns off the timer 4. In the eighth step, the Nil network element resets the timer 2 and re-times. At this point, the step of backing up SPEAKER to detect the primary SPEAKER node has been completed. At this point, the process of using the SPEAKER to detect the backup SPEAKER and the backup SPEAKER to detect the primary SPEAKER is over. Embodiment 3: In conjunction with FIG. 3, FIG. 4 and FIG. 8, the main SPEAKER N21 and the backup SPEAKER N22 have been elected in the domain CD2 in the embodiment 1, and the switching action triggered by the SPEAKER fault in the technical solution is specifically described. The steps are as follows: In the first step, the power of the N22 is manually turned off, as shown in i or CD2 in Figure 4. 07 000014 In the second step, after the timer of N21 expires, the N22 status is queried. Because N22 is faulty, the query fails. The third step, N21 issued a re-election back to SPEAKER's 4 essays. Re-elect backup SPEAKER. In the fourth step, domain CD2 internally performs the relevant steps in Embodiment 1 to re-elect the backup.

SPEAKER N23. In the fifth step, the data is synchronized between N22 and N23, and the SPEAKER database is synchronized. At this point, the backup action caused by the backup SPEAKER failure has been completed. See the domain in Figure 5

CD2. Embodiment 4: With reference to FIG. 3 and FIG. 7 , the main SPEAKER Ni l and the backup SPEAKER N12 have been elected in the embodiment 1 domain CD1 as an example, and the switching action triggered by the main SPEAKER fault in the technical solution is specifically described: Manually turn off the power of the Ni l. In the second step, after the N22 timer 3 expires, the N21 status query fails due to the Ni l failure. The third step, N22 check the backup database, because the original SPEAKER database synchronization operation, so the database query is successful. In the fourth step, N22 sends a statement to the other nodes inside the domain that it is the primary SPEAKER. In the fifth step, N22 receives the response of i into each internal node. In the sixth step, the N22 changes state to SPEAKER. In the seventh step, the N22 initiates the election backup SPEAKER, and elects the backup SPEAKER N23 in the domain. The network diagram is shown in the domain CD1 in FIG. In the eighth step, data synchronization is performed between N22 and N23. In the ninth step, the N22 initiates an intra-domain network information update operation. 07 000014 At this point, the active/standby switching action caused by the main SPEAKER error has been completed. Embodiment 5: With reference to FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, the detection procedure of the backup SPEAKER N12 is selected by the main SPEAKER Ni1 in the domain CD1 of the embodiment 1 as an example, and respectively appears in different domains. The switching action of the active and standby SPEAKER fault bows is specifically described: In the first step, as shown in Figure 2, two domains CD1 and CD2 are set up, and the NEs in the domain are powered on and transferred to the next step. The second step is to perform the SPEAKER election in the domain. The domain CD1 election completes the SPEAKER Ni l and the backup SPEAKER N12. The domain CD2 elects the SPEAKER N21 and the backup SPEAKER N22. The election result is shown in Figure 3. In the third step, the data synchronization between the active and standby SPEAKERs in the domain CD1 and the domain CD2 is completed. In the third step, artificially causing Ni1 to fail in domain CD1, backup N22 in domain CD2 fails. The schematic is shown in Figure 4. The fourth step, the SPEAKER timer in each domain expires, so the domain CD 1 backup SPEAKER N12 fails to query the Ni l state, the domain CD2 primary SPEAKR N21 query backup SPEAKER N22 state fails, so the domains CD1 and CD2 are independent of each other. Active/standby switching action. See Example 3 and Example 4 for specific steps. In the fifth step, the active and standby SPEAKER switches in each domain are completed, the SPEAEKR in the domain CD1 is N12, and the primary SPEAEKR in the domain CD2 is N22. In the sixth step, SPEAKER N12 and N22 in each domain initiate re-election backup respectively.

SPEAKER, N13 in the election domain CD1 is the backup SPEAKER, and N23 in the domain CD2 is the backup SPEAKER. The network diagram after the completion of the switching is shown in Figure 5. In the sixth step, the active and standby SPEAKERs in each domain perform data synchronization and update. At this point, the difference: t or the internal active and standby SPEAKER respectively, the switching action has been completed. According to the above embodiments, the technical solution adopts the mutual backup SPEAKER mutual backup protection mechanism, and has the advantages of quickly recovering the SPEAKER function and high switching efficiency. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

权禾Γ request

A protection method for an inter-domain protocol end point of an optical network, characterized in that the method comprises the following steps:

Step S102: Elect the primary endorsement point and the ^^ endorsement point in the domain, and the primary endorsement point and the backup endorsement point respectively aggregate node information and routing information of the domain, and perform inter-layer communication;

Step S104, establishing a communication connection between the primary endorsement point and the backup endorsement point, for performing key data backup and state backup of routing information;

Step S106, the primary endorsement point and the backup endorsement point mutually detect each living state through the communication connection, and if the backup endorsement point detects that the primary endorsement point fails, the The backup endorsement point becomes a new primary endorsement point, and a new backup endorsement point is elected, and the process returns to step S104. If the primary endorsement point detects that the backup endorsement point is faulty, the new backup endorsement point is elected, and the process returns to Step S104, if no fault is detected, the step S106 is repeated.

The protection method according to claim 1, wherein in step S102, the election of the primary use point and the backup endorsement point comprises the following steps:

Step a, configure the candidate qualifications of each node, including being eligible to become the primary endorsement point, qualifying as a backup endorsement point, or not qualified;

Step b, after establishing a two-way communication connection between the node and the node, each node lists a list of all nodes that may become the primary endorsement point and the backup endorsement point, and then each node declares itself as the candidate according to the candidate qualification Use the endorsement point, or backup endorsement point, or do not speak, if there is no node to declare its own endorsement point or backup endorsement point, then go to step e;

Step c, in the list of nodes that are all eligible to become the primary endorsement point, create a subset that has not been declared to be the primary endorsement point;

Step d, if one or more nodes declare that they are the primary endorsement points, then the node with the highest priority becomes the primary endorsement point, and if the priorities are equal, the final primary endorsement point is determined by comparing other attributes to proceed to Step f; Step e, selecting the node with the highest priority as the primary endorsement point, and if the priorities are equal, comparing the other attributes to determine the final primary endorsement point;

Step f, in the list of nodes that are all eligible to be the backup endorsement point, create a subset that has not been declared as a backup endorsement point;

Step g, if one or more nodes declare that they are backup endorsement points, the node with the highest priority becomes the backup endorsement point, and if the priorities are equal, the final backup endorsement point is determined by comparing the other attributes, and the process ends;

Step h: Select the node with the highest priority as the backup end point. If the priorities are equal, compare the other attributes to determine the final backup end point.

The protection method according to claim 2, wherein the other attributes include a node F and an IP address.

The protection method according to claim 1, wherein in step S106, detecting the respective living states of the primary endorsement point and the backup endorsement point comprises the following steps:

Step P1, the primary endorsement point starts a first timer, and is used to track and detect a time interval for sending a status query message, where the backup endorsement point starts a second timer, and is used to detect whether there is a query or a command from the specified time. The primary endorsement point is issued;

Step P2, if the first timer first arrives, then proceeds to step P3, and if the second timer first arrives, proceeds to step P6;

Step P3, the primary endorsement point sends a message to the backup endorsement point, queries the status of the backup endorsement point, and starts a third timer, which is used to query whether the response time of the backup endorsement point times out, and pauses The first timer;

Step P4, if the backup endorsement point receives the query information of the primary endorsement point, the backup endorsement point sends a response, and simultaneously resets the second timer, indicating that the query message has been received internally within a specified time. ;

Step P5, if the primary endorsement point receives the response message of the backup endorsement point before the third timer expires, the primary endorsement point closes the third timer, indicating that Receiving a response message at a specified time, and if the message indicates that the backup endorsement point is in a normal state, the primary endorsement point resets the first timer, indicating that the backup endorsement point is all normal, and returns to step P1, if Not yet when the third timer expires If the response is received or the received response indicates that the backup endorsement point is wrong, the primary endorsement point does not restore the first timer, and it is determined that the primary endorsement point is faulty, and the detection is reversed;

Step P6, the backup endorsement point sends a message to query the status of the primary endorsement point, suspend the second timer, and start a fourth timer to monitor the response of the primary endorsement point;

Step P7, if the backup endorsement point receives the response message of the primary endorsement point before the fourth timer expires, and the message indicates that the primary endorsement point is all normal, the backup endorsement point The fourth timer is closed, the second timer is restored and restarted, and the process returns to step P1. Otherwise, it is determined that the backup end point fails, the detection is suspended, and the switching is performed. The protection method according to claim 1, wherein in step S106, the backup endorsement point becomes a new primary endorsement point, and the election of the new backup endorsement point comprises the following steps: Step T1, the backup The endorsement point first checks the database of the primary backup end point of the local backup; - Step T2, if the database in the backup endorsement point is valid, the backup endorsement point sends a message stating that it is the endorsement point to the existing node, and waits for other nodes Respond, if 杲 is invalid, proceed to step S102;

Step T3, after receiving a reply from another network node, the backup endorsement point changes its own state, and sets its own state as a new primary endorsement point;

― Step T4, the new primary endorsement point sends an update message to other nodes in the network, waiting for the database to be updated;

Step T5, the new main endorsement point issues a backup end point node election message, and re-selects the backup end point. The protection method according to claim 1 or 5, characterized in that the election of the new backup speech point comprises the following steps:

In the list of nodes that are eligible to be the backup endorsement point, create a subset that has not been declared a backup endorsement point;

If one or more nodes declare themselves to be backup endorsement points, then have the highest The priority node becomes the backup endorsement point. If the priorities are equal, the final backup endorsement point is determined by comparing the other attributes, and the process ends;

Select the node with the highest priority as the backup endorsement point, and if the priorities are equal, compare the other attributes to determine the final backup endorsement point. The protection method according to claim 6, wherein the other attributes include a node identifier and an IP address. The protection method according to any one of claims 1 to 5, characterized in that the optical network comprises an automatically switched optical network. The protection method according to any one of claims 1 to 5, wherein the inter-domain protocol comprises an inter-domain routing protocol. The protection method according to any one of claims 1 to 5, characterized in that, when the primary endorsement point or the backup endorsement point failure occurs in different domains, respectively, the main auxiliary equipment is independently entered in the different domains « Word change protection.