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OSPF NSR
Non-Stop Routing (NSR) is a routing technique that prevents a neighbor from sensing the fault on the control plane of a device that provides a slave control plane. With NSR, when the control plane of the device becomes faulty, the neighbor relationship set up through specific routing protocols, MPLS, and other protocols that carry services are not interrupted.
As networks develop at a fast pace, operators are having increasingly higher requirements for reliability of IP networks. NSR, as a high availability (HA) solution, is introduced to ensure that services transmitted by a device are not affected when a hardware or software failure occurs on the device.
OSPF NSR synchronizes the protocol data on the master MPU/SRU to the slave MPU/SRU in real time. When the master MPU/SRU becomes faulty or needs to be upgraded, the slave MPU/SRU rapidly takes over services from the master MPU/SRU without being
sensed by the neighbor. OSPF NSR synchronizes the real-time data between the master and slave MPUs/SRUs in the following manners:![]()
- OSPF backs up configuration data and dynamic data, including information about interfaces, neighbors, and LSDBs.
- OSPF does not back up routes, shortest path trees (SPTs), and Traffic Engineering DataBases (TEDBs). All these can be restored through the source data by using the database backup process.
- When the master-slave switchover occurs, the new master MPU/SRU restores the operation data and takes over services from the former master MPU/SRU without being sensed by the neighbor.
Only the AR3200 series support NSR.
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