View source for Step-by-Step Firmware Upgrade Procedure for Managed Network Switches (Including TP-Link Switches as example)

'''Purpose'''
This document outlines a standardized procedure for performing firmware upgrades on managed network switches. The procedure is designed to minimize impact on network operations and includes detailed steps for pre-upgrade assessment, configuration backup, firmware upgrade execution, and post-upgrade validation. Additionally, this document provides a vendor-specific example illustrating the upgrade process for TP-Link managed switches.

==Scope==
This procedure applies to all managed switches within the network and includes:
* Generic firmware upgrade steps applicable to all vendors
* OEM-specific example for TP-Link switches (GUI-based upgrade)

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== Pre-Upgrade Checks ==
Before starting a firmware upgrade, ensure the following checks are completed.

=== a. Check Current Firmware Version ===
* '''CLI''': Use vendor-specific commands such as:
<pre>
show version
show running-config
</pre>
* '''GUI''': Navigate to:
<pre>
System Info → Firmware Version
</pre>

=== b. Verify Hardware Warranty ===
* Confirm the switch is under warranty or supported for the target firmware version
* Verify support status via the vendor support portal using the device serial number

=== c. Document Network Connectivity ===
* Maintain an updated network diagram showing:
** Connected devices
** VLANs
** Spanning Tree Protocol (STP) topology
* Identify critical devices dependent on the switch

=== d. Confirm Downtime Window ===
* Schedule the upgrade during an approved maintenance window to minimize business impact

== Backup Existing Configuration ==
Backing up the current configuration is mandatory to enable rollback in case of upgrade failure.

=== a. CLI Backup Example ===
<pre>
copy running-config tftp://<TFTP_SERVER_IP>/<switch_name>-backup.cfg
</pre>

=== b. GUI Backup ===
* Navigate to:
<pre>
System Tools → Backup Config → Save Configuration Locally
</pre>
* Verify the integrity of the backup file to ensure it is complete and usable

== Firmware Upgrade Preparation ==

=== a. Download New Firmware ===
* Download firmware from the official vendor support portal
* Ensure firmware compatibility with the switch hardware version

=== b. Review Release Notes ===
* Verify supported hardware versions
* Identify bug fixes, known issues, and behavioral changes

=== c. Document Pre-Upgrade State ===
Record the following before the upgrade:
* Device uptime
* Connected devices
* Port utilization
* VLAN configuration
* STP state

== Upgrade Execution (Generic Steps) ==

=== a. Access the Switch ===
* '''CLI''': SSH or console access
* '''GUI''': HTTPS access via web browser

=== b. Upload Firmware ===
* '''CLI''':
<pre>
copy tftp flash
</pre>
(or vendor-specific command)
* '''GUI''': Navigate to:
<pre>
Firmware Upgrade → Select File → Upload
</pre>

=== c. Initiate Upgrade ===
* Confirm upgrade settings
* Allow the device to reboot automatically

=== d. Do Not Interrupt ===
* Do not power off the switch
* Do not disconnect network cables
* Do not refresh the browser during the upgrade process

== Post-Upgrade Validation ==

=== a. Verify Firmware Version ===
* Confirm the switch is running the newly installed firmware

=== b. Validate Network Stability ===
* Ping critical devices
* Verify VLAN assignments
* Validate STP topology
* Review system logs for errors

=== c. Verify Configuration ===
* Confirm that security and management services remain enabled:
** SSH
** HTTPS
** SNMP (if applicable)

=== d. Backup Post-Upgrade Configuration ===
* Save the updated configuration locally or to a TFTP server

=== e. Rollback Plan ===
* If the upgrade fails:
** Restore the previous configuration
** Boot the device using the backup firmware image

== TP-Link Switch upgrade Example (GUI-Based Upgrade) ==

=== Step 1: Access Web GUI ===
* Open a browser and navigate to:
<pre>
https://<switch-ip>
</pre>
* If prompted with an SSL warning, select:
<pre>
Advanced → Accept the Risk and Continue
</pre>

=== Step 2: Login ===
* Enter administrator credentials and log in

=== Step 3: Verify Current Firmware Version ===
* Navigate to:
<pre>
System → System Info → System Summary
</pre>
* Note the '''Hardware Version''' and '''Firmware Version'''

=== Step 4: Navigate to Firmware Upgrade ===
* Go to:
<pre>
System Tools → Firmware Upgrade
</pre>
* Upload the firmware file downloaded from the TP-Link support portal

=== Step 5: Upgrade and Reboot ===
* Click '''Upgrade'''
* Allow firmware upload and automatic reboot
* Do not refresh the browser or disconnect the network

=== Step 6: Monitor Reboot Progress ===
* Wait for the progress bar to complete and device to become reachable

=== Step 7: Verify SSH Configuration ===
* Navigate to:
<pre>
Security → Access Security → SSH Config
</pre>
* Ensure:
** SSH: Enabled

=== Step 8: Verify HTTPS Configuration ===
* Navigate to:
<pre>
Security → Access Security → HTTPS Config
</pre>
* Ensure:
** HTTPS: Enabled
** Port: 443

=== Step 9: Post-Upgrade Backup ===
* Navigate to:
<pre>
System Tools → Backup Config → Save updated configuration
</pre>

== Notes / Best Practices ==
* Perform firmware upgrades only during approved maintenance windows
* Always maintain verified configuration and firmware backups
* Keep a tested rollback plan available
* Validate all critical services post-upgrade
* Maintain version history and documentation for audit and reference

== 10. Conclusion ==
Firmware upgrades on managed switches are critical maintenance activities that must be executed carefully to ensure network stability and security. Following a structured upgrade procedure—including pre-upgrade checks, proper configuration backups, controlled upgrade execution, and thorough post-upgrade validation—significantly reduces the risk of downtime or configuration loss. Adhering to vendor guidelines and maintaining detailed documentation ensures safe and efficient firmware management across the network.


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