Nsr Overview; Introduction To Nsr - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability

7.1 NSR Overview

This section describes how to implement NSR and related technologies.

7.1.1 Introduction to NSR

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).
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NSF: ensures that forwarding services are not interrupted during the active/standby
switchover of main control boards by using the protocol-specific GR 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.
For details about the GR configuration, see the chapter "GR Configuration" in the HUAWEI
NetEngine80E/40E Router Configuration Guide - Reliability.
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.
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