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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Overview of NSR

Overview of NSR


Non-stop routing (NSR) is a reliability technique used to prevent control planes on neighbor nodes from detecting faults in the control plane on a local device when both an active main board (AMB) and a standby main board (SMB) are installed on the local device.


The demand for data, audio, and video services is growing, which impose increasing requirements on IP network reliability. A provider edge (PE) can perform an AMB/SMB switchover if a single point of failure occurs or a maintenance operation (an upgrade, for example) is performed. The PE fails to converge routing information during the AMB/SMB switchover if its neighbor nodes fail simultaneously or these nodes do not support graceful restart (GR). NSR helps the PE converge routing information and ensures uninterrupted forwarding.


NSR prevents route flapping during an AMB/SMB switchover so that services are not affected. NSR satisfies carrier requirements for high IP network reliability.

Updated: 2019-04-03

Document ID: EDOC1100075366

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