Configuring The System-Level Gr; Before You Start - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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The HA feature that integrates dual main control boards, GR, and HSB is called system-level
GR. The function of the system-level GR is to decrease the impact of the AMB/SMB switchover
on the packet forwarding.
A router can perform the system-level GR on the following conditions:
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6.2 Configuring the System-Level GR

System-level GR is a technology that combines redundancy backup, GR, and HSB together to
improve HA of devices.

6.2.1 Before You Start

Before configuring the system-level GR function, familiarize yourself with the usage scenario,
complete the pre-configuration tasks, and obtain the required data.
Applicable Environment
The system-level GR function is used in the following situations:
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To ensure that services are not affected during the switchover, configure information
synchronization between AMB and SMB. So far, there are two modes: automatic and manual.
So far, there is one mode: manual.
Pre-configuration Tasks
Before configuring system level GR, complete the following tasks:
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Issue 02 (2014-09-30)
Backs up static configuration from the AMB to the SMB through HSB, and backs up the
status of the protocols that do not have the GR capability.
Restores the session status of the protocol extended with the GR capability, with the help
of the neighboring routers.
The router has dual main control boards.
BGP, OSPF, IS-IS, and LDP support the GR function.
The router supports HSB.
NOTE
When a router supports only GR rather than HSB, this router can be used as a GR Helper to support the
GR process of other routers.
A system fault triggers the AMB/SMB switchover.
When upgrading the software or maintaining the system, the administrator manually
triggers the AMB/SMB switchover.
Configure basic protocol functions.
Configure a protocol level GR capability.
NOTE
For the detailed configurations of OSPF GR, IS-IS GR, and BGP GR, refer to the HUAWEI NetEngine80E/
40E Router Configuration Guide - IP Routing; for the detailed configurations of LDP GR, refer to the
HUAWEI NetEngine80E/40E Router Configuration Guide - MPLS.
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