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Configuration Guide - Basic Configuration

S7700 and S9700 V200R010C00

This document describes methods to use command line interface and to log in to the device, file operations, and system startup configurations.
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Principles

Principles

Two ISSU modes are available:
  • Lossless ISSU

    When all features support ISSU, lossless ISSU can be performed.

  • Lossy ISSU

    When some features do not support ISSU, lossy ISSU can be performed.

NOTE:

Currently, lossy ISSU is supported.

ISSU Process

As shown in Figure 9-1, ISSU goes through four phases:
  1. ISSU check

    The system checks whether ISSU conditions are met. If so, the standby MPU restarts using the new system software.

  2. ISSU start

    The system backs up data between the master MPU and standby MPU.

  3. ISSU switchover

    The standby MPU becomes the new master MPU.

  4. ISSU confirm

    The old master MPU restarts using the new system software and becomes the new standby MPU after the restart.

Before the ISSU switchover phase, you can use the ISSU abort function to abort ISSU and roll back the system to the old version.

Figure 9-1  ISSU flowchart

Table 9-1 describes the ISSU process.

Table 9-1  ISSU process

ISSU Phase

ISSU Flowchart

Implementation

ISSU check

Figure 9-2  ISSU check phase

In Figure 9-2, the system performs a compatibility check on the version and specifications to determine whether to perform ISSU and which ISSU mode to use, and then the standby MPU restarts using the new system software.

ISSU start

Figure 9-3  ISSU start phase

In Figure 9-3, the system backs up data between the master MPU and standby MPU.

ISSU switchover

Figure 9-4  ISSU switchover phase

In Figure 9-4, the system switches the control planes of the master MPU and standby MPU, and then the LPU restarts.

ISSU confirm

Figure 9-5  ISSU confirm phase

In Figure 9-5, the old master MPU restarts using the new system software. The system sets the system software for next startup of the master MPU and standby MPU to the new system software. Then the ISSU process ends.

Version Rollback

ISSU provides the version rollback mechanism to allow the system to return to the old version. This mechanism reduces version upgrade risks.

Two version rollback modes are available:
  • Automatic rollback using the ISSU rollback timer

    The ISSU rollback timer is activated when the system enters the ISSU check phase. If the ISSU rollback timer expires before the system enters the ISSU switchover phase, the system rolls back to the old version.

  • Manual rollback using the ISSU abort function

    Before the system enters the ISSU switchover phase, you can use the ISSU abort function to enable the system to roll back to the old version.

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Updated: 2019-04-18

Document ID: EDOC1000141895

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