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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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IS-IS NSR

IS-IS NSR

Background

As networks develop, the demand for data, audio, and video services is growing, which imposes increasing requirements on IP network reliability. If an AMB/SMB switchover is performed on a device due to a maintenance operation or a single point of failure, routes may fail to converge, which may result in traffic loss or even a network breakdown. Non-stop routing (NSR) can address this problem and ensure uninterrupted forwarding of key services.

Related Concepts

  • High availability (HA): supports data backup between the AMB and SMB.
  • Non-stop forwarding (NSF): enables a node to use the GR mechanism to ensure uninterrupted transmission during an AMB/SMB switchover.
  • NSR: allows a standby control plane to take over traffic from an active control plane if the active control plane fails, preventing the control planes of neighbors from detecting the fault.
  • AMB and SMB: run control plane processes.

Implementation

With IS-IS NSR, IS-IS real-time data is synchronized between the AMB and SMB. After an AMB/SMB switchover is performed on a device, the SMB takes over services from the AMB, and neighbors are unaware of the local fault. After the switchover, the new AMB restores IS-IS immediately based on the synchronized IS-IS real-time data. Therefore, neighbors are unaware of the switchover as well. IS-IS NSR requires synchronization of the following data:

  • All configuration data, such as information about neighbors, timer parameters, and process configurations.

  • Dynamic data, such as the interface parameters and state, and information about neighbors and the link state database (LSDB).

NOTE:

For details about NSR, see "" in Feature Description - Reliability.

Usage Scenario

NSR minimizes the impact of control plane faults and prevents route flapping on networks that require high reliability.

Benefits

NSR improves network reliability and ensures uninterrupted traffic forwarding.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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