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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Non-Stop Routing (NSR) is a routing technique that prevents neighboring routers from detecting faults on the control plane of a device with a backup control plane. With NSR, when the control plane of the device fails, the neighbor relationship set up through specific routing protocols, MPLS, and other protocols that carry services is uninterrupted.

As networks develop and expand, carriers place increasingly higher requirements on the reliability of IP networks. NSR was introduced as a high availability (HA) solution to ensure that services transmitted by a device were unaffected by hardware or software failures on the device.

OSPF NSR synchronizes the protocol data on the master main control board to the slave main control board in real time. When the master main control board fails or needs to be upgraded, the slave main control board immediately takes over services from the master main control board, and the neighbor remains unaware the fault occurred. Real-time data synchronization between the master and slave main control boards through OSPF NSR is implemented as follows:

  • 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), or Traffic Engineering Databases (TEDBs). Such information can be restored using the source data in the database backup process.
  • When the master/slave main control board switchover occurs, the new master main control board restores the operations data and takes over services from the former master main control board. Throughout this process, the neighbor remains unaware of the fault.
Updated: 2019-01-04

Document ID: EDOC1100059473

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