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PIM
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MSDP
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MVPN
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IPv4/IPv6 L3VPN
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RSVP
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LDP
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BFD
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VRRP
7.2 Configuring NSR
After NSR is configured, route processing and traffic forwarding are not interrupted during the
active/standby switchover of main control boards.
7.2.1 Before You Start
Before configuring system-level NSR, familiarize yourself with the usage scenario, complete
the pre-configuration tasks, and obtain the required data.
Applicable Environment
The system-level NSR function is used in the following situations:
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A system fault triggers the active/standby switchover of main control boards.
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When upgrading the software or maintaining the system, the administrator manually
triggers the active/standby switchover of main control boards.
NSR requires high system reliability. When the control plane of the system becomes faulty, the
system can switch entries on the faulty control plane to the backup control plane, which is
independent of the neighbor and does not interrupt route processing.
NSR has the following limitations:
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The switchover time is not strictly controlled, because the switchover time is not the key
performance index after the active/standby switchover of main control boards.
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Because the neighbor relationship is kept during the active/standby switchover of main
control boards on the local device, the remote device may consider that existing neighbor
relationships need to be re-established after the switchover. In this situation, the neighbors
of the device can sense the switchover. In addition, when neighbor relationships are
established, no Update packets are sent. Therefore, re-establishment of neighbor
relationships does not interrupt any service.
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NSR cannot ensure the high reliability of the system with only one main control board.
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If a fault occurs in the main process before the batch backup, the slave process, whose status
is unknown and is not switchable, cannot function as the main process.
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The system enabled with NSR does not support system-level GR.
Pre-configuration Tasks
None.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
7 NSR Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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