Enabling Is-Is Gr - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Applicable Environment
The restart of an IS-IS router causes the temporary interruption of the network, because the
adjacency relationship between the router and its neighbor is torn down. The LSPs packets of
the router are deleted, which makes route calculation inaccurate. Packets are therefore lost.
You can configure IS-IS GR to solve this problem. After IS-IS GR is enabled, the router notifies
the neighbor of the restart status, and reestablishes the adjacency relationship with its neighbor
without interrupting the forwarding.
The advantages of IS-IS GR are as follows:
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Pre-configuration Tasks
Before configuring IS-IS GR, complete the following tasks:
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Data Preparation
To configure IS-IS GR, you need the following data.
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7.21.2 Enabling IS-IS GR

Before configuring IS-IS GR, you need to enable the GR capability for IS-IS.
Context
Perform the following steps on the router that runs IS-IS.
Procedure
Step 1 Run:
system-view
Issue 02 (2014-09-30)
When IS-IS restarts, the router can resend connection requests to its neighbor. The
adjacency relationship is not torn down.
Before LSPs packets are generated, GR minimizes the interference caused by waiting for
the database synchronization.
If the router starts for the first time, the router sets the overload bit in LSPs until the LSDB
synchronization is complete. This avoids route black holes.
Configuring IP addresses for interfaces to ensure network connectivity between
neighboring nodes.
Configuring Basic IS-IS Functions
Data
ID of an IS-IS process
Interval for reestablishing GR sessions
Whether to suppress the advertisement of the adjacency when the GR restarter restarts
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