[TechNotes] CSS Split Upgrade Guide for S Series Switches

【Introduction】

• Overview

• Declaration

• Prerequisites

• Upgrade Preparations

• CSS Split Upgrade Operations

• Upgrade Verification

• Optional Follow-up Operations

【Contents】

Overview

    A cluster switch system (CSS) can be upgraded in one of the following ways: traditional upgrade, fast upgrade, split upgrade, and in-service software upgrade (ISSU). During a split upgrade, the standby switch first restarts with the new system software for an upgrade, and the master switch forwards data traffic. After the standby switch is upgraded, it becomes the new master switch and starts to forward data traffic. The original master switch, at this time, restarts with the new system software for an upgrade, and becomes the new standby switch after the upgrade. Split upgrade greatly reduces the service interruption duration during the upgrade and has little impact on services, compared with traditional upgrade and ISSU upgrade. Compared with fast upgrade, split upgrade is more reliable. This document describes the split upgrade process for a CSS.

Upgrade Preparations

    1.Preparing Upgrade Tools

    2.Obtaining Required Upgrade Software

    3.Preparing the Latest Patch File

    4.Obtaining a License File

    5.Preparing a Configuration File

    6.Checking the Current Software Version and Device Information

    7.Checking Whether the Device Is a CSS Member

    8.Backing Up Data

CSS Split Upgrade Operations

    1.Uploading Required Files

    2.Specifying Files for Next Startup

    3.Deleting the Configuration of Specifying One Switch as the Master Switch of a CSS

    4.Configuring a System MAC Address for the CSS

    5.Upgrading the Original Standby Switch

    6.Upgrading the Original Master Switch

    7.Setting Up a New CSS

Upgrade Verification

    1.Checking Whether the System Software Used for Current Startup Is the Target Version

    2.Checking Whether the Patch Is Installed

    3.Checking the Software Version of Boards

    4.Checking the Registration Status of Boards

    5.Checking Whether Configurations Are Restored

    6.Checking Whether Services Are Running Properly

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