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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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Overview of NSR

Overview of NSR

NSR and NSF

NSR is a type of reliability technology that keeps the neighbor relationships of a device during the active/standby switchover of main control boards on the device.

Non-Stopping Forwarding (NSF) and Non-Stopping Routing (NSR) are two solutions to High Availability (HA).
  • NSF: ensures that forwarding services are not interrupted during the active/standby switchover of main control boards by using the protocol-specific GR (Graceful Restart) mechanism.
    • When a fault occurs in the system, forwarding services are not interrupted during system restart.

    • After the device recovers, it can re-establish neighbor relationships with other devices, and then rebuild the routing table based on the information obtained from its neighbors.

  • NSR: ensures that route processing is not interrupted on the control plane and the forwarding plane during the active/standby switchover of main control boards by using the backup mechanism of a related protocol.

    During the active/standby switchover of main control boards on a device, the route processing is not interrupted because of the following factors:
    • No neighbor or topology information is lost.

    • No neighbor relationship goes Down.

    The advantages of NSR are as follows:
    • NSR on the local device does not depend on or affect the remote device. Therefore, the local and remote devices can communicate properly.

    • The route convergence speed of NSR is higher than that of NSF.

NSR and GR

On the device that performs the active/standby switchover of main control boards, the system supports two HA protection mechanisms: NSR and GR. NSR and GR are mutually exclusive. That is, during the active/standby switchover of main control boards, the system can use either NSR or GR for a specific protocol. When being deployed with NSR, a device can keep its neighbor relationships so that the device can help its neighbor complete GR. This ensures the HA of services on all nodes of a network to maximum extent.

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Updated: 2019-05-17

Document ID: EDOC1000174116

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