Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Firmware upgrade and downgrade considerations with Telnet or SSH

Downgrading the firmware on a switch to a Network OS version earlier than 4.0 is not allowed when either the Telnet server or the SSH server on the switch is disabled. To downgrade to a lower version, both the Telnet Server and SSH Server must be enabled.

Upgrading to Network OS v4.0 or later is automatically allowed because the Telnet server and SSH server status are enabled by default.