Platform; Routing - Brocade Communications Systems StoreFabric SN6500B Troubleshooting Manual

Message Cannot upgrade directly to v6.3.0. Upgrade your switch to v6.2.0 first before upgrading to the
requested version.
Probable cause and recommended action
If the switch is running v6.1.0 or earlier, you are not allowed to upgrade directly to v6.3.0 because
of the "two-version" rule.
Upgrade your switch to Fabric OS version v6.2.0 before upgrading to v6.3.0
Message Non-disruptive firmwaredownload is not supported when downgrading to 6.1. Please use
firmwaredownload -s to download the 6.1 firmware.
Probable cause and recommended action
If the switch is running v6.2.0, you are not allowed to downgrade directly to v6.1.x without causing
disruption to your fabric.
Downgrade using the firmwareDownload -s command. For more information on using this
command, refer to the Fabric OS Administrator's Guide.
Message Firmwaredownload of blade application firmware failed. Reissue firmwareDownload to recover.
Probable cause and recommended action
The firmware download operation was attempting to upgrade the SAS image while the blade was
operational.
Retry the firmwareDownload command again.

Platform

This system message pertains to switch features or fabric-wide settings that must be removed or
disabled before downgrading the firmware.
Message Downgrade is not allowed because VF is enabled. Please run "lscfg - -config" and "lscfg - -delete"
commands to remove the non-default LS first, then run "fosconfig - -disable vf" to disable VF before
proceeding.
Probable cause and recommended action
You cannot downgrade because Virtual Fabrics are enabled. Delete the logical switches, delete the
base switch, and disable Virtual Fabrics prior to downgrading the firmware.

Routing

This system message refers to any route settings that must be changed prior to downgrading the
switch's firmware.
Message Downgrade is not allowed because IOD Delay value is configured for one or more domains. Please
use "ioddelayshow and ioddelayreset" to disable them before downgrading.
Probable cause and recommended action
If the switch is running v6.2.0 or later, and IOD Delay value is configured for one or more domains,
you cannot downgrade the switch to v6.1.0 or earlier.
Use the iodDelayReset command to reset the IOD delay to its default value.
Fabric OS Troubleshooting and Diagnostics Guide
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Considerations for downgrading firmware
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