ServiceCenter at the DR Site Is Faulty

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If one ServiceCenter VM at the DR site is faulty or both the active and standby ServiceCenter VMs at the DR site are faulty, and services cannot be recovered after ServiceCenter is restarted, you can troubleshoot the faults by following the instructions provided in this section to recover the services.

For details,seeServiceCenter at the DR Site Is Faulty,The applicable version is 3.0.9.

Other related questions:
ServiceCenter at the DR Site Is Abnormal
If ServiceCenter at the DR site is abnormal, you need to perform the operations in this section to troubleshoot the fault and quickly restore services. For details,seeServiceCenter at the DR Site Is Abnormal,The applicable version is 3.0.9.

What Do I Do If the Synchronization Status Is Displayed as Abnormal After the cascadeTool query Command Is Executed on the Active Node of ServiceCenter at the Production Site and the Active Node at the DR Site
【Product�? ManageOne ServiceCenter 【Version�? 3.X 【Question�? What do I do if the synchronization status is displayed as abnormal after the cascadeTool query command is executed on the active node of ServiceCenter at the production site and the active node at the DR site? 【Answer�? The active node at the DR site synchronizes data from the active node at the production site. If any of the following situations occurs, the database at the production site cannot be synchronized. The synchronization status is displayed as abnormal after you run the cascadetool query command. The active and standby nodes of ServiceCenter at the production site or the active node at the DR site are faulty. The network at the production or DR site is faulty. Network ports required for DR synchronization are not enabled based on the communication matrix. ----End

Both the Active and Standby ServiceCenter VMs Faulty
When two ServiceCenter VMs are deployed in active/standby mode and both the active and standby ServiceCenter VMs become faulty and cannot be restored by restart, perform the operations provided in this section to rectify faults and quickly restore services. For details,seeBoth the Active and Standby ServiceCenter VMs Faulty, The applicable version is 3.0.8 or 3.0.9.

A Single ServiceCenter VM Faulty in Active/Standby Deployment Mode
When two ServiceCenter VMs are deployed in active/standby mode and one ServiceCenter VM becomes faulty and cannot be restored by restart, perform the operations provided in this section to rectify faults and quickly restore services. For details,seeA Single ServiceCenter VM Faulty in Active/Standby Deployment Mode, The applicable version is 3.0.8 or 3.0.9.

What are DR, BDR, DR other and election rules
DR means designated router. BDR means backup designated router. DR Other indicates a device that is neither a DR or a BDR. The DR advertises link-state advertisements (LSAs) to all the devices in the network. The DR election rules are as follows: When going Up, an interface sends Hello messages and enters the waiting state. In the waiting state, a waiting timer is triggered. The waiting timer duration is the same as the dead timer duration. By default, the waiting timer duration is 40 seconds, which cannot be changed. Before the waiting timer is triggered, sent Hello messages carry no DR or BDR field. In the waiting state, if a received Hello message carries the DR and BDR fields, the DR and BDR are accepted directly without any election triggered, and neighbor state synchronization starts, directly exiting the waiting state. Assume that a DR and a BDR exist on the network. Any device newly connected to the network will accept the DR and BDR that exist on the network regardless of the router ID of the device. If the DR fails and goes down, the BDR takes over the role of the DR and the remaining devices whose priority is greater than 0 compete to become the new BDR. DR election rules are used to elect a DR only when devices with different router IDs or configured with different DR priorities are started at the same time. The election rules are that the device with the highest DR priority is elected as DR and the device with the second highest DR priority as BDR. A device with a DR priority of 0 can be a DR Other only. In the case of the same priority, the device with the greatest router ID is elected as DR, the device the second greatest router ID becomes the BDR, and other devices are DR Others.

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