Downgrade considerations
• Any new command in FastIron 08.0.xx is discarded during downgrade.
• The startup configuration as well as the run time changes in a FastIron 08.0.xx configuration are lost
during downgrade.
• If software-based licensing is in effect on the device, and if the software is downgraded to a version
earlier than FastIron 07.1.00, software-based licensing is not supported.
• SSHv2 RSA host key format differs among FastIron 07.x.xx, 08.0.00, and 08.0.xx software versions.
• On an FSX device with the SX Series 0-Port Third Generation XL management module, a hitless
downgrade from FastIron 08.0.10 to 08.0.00a or 08.0.01 is not supported.
• When you downgrade from FastIron 08.0.xx to 08.0.00 or 07.x.xx, consider the following scenarios:
‐ When an SSHv2 RSA host key in FastIron 08.0.00a or later is retained from FastIron
07.x.xx or 08.0.00, booting up with FastIron 07.x.xx or 08.0.00 reads the old format SSHv2
RSA host keys and enables the SSHv2 RSA server on the switch.
‐ When an SSHv2 RSA host key is created in FastIron 08.0.00a and later, booting up with
FastIron 07.x.xx or 08.0.00 software does not read the new format SSHv2 RSA host key,
and the SSHv2 server is not enabled on the switch.
Considerations for devices with LAGs
• If you are upgrading to FastIron 08.0.xx and have either LAGs or LACP configured, the previous
configuration is automatically updated to form a new equivalent LAG. To accomplish this, the old
trunk and link-aggregation commands are maintained during startup configuration parsing but are
disabled during normal configurations. The following are the major differences in LAG configuration
in FastIron 08.0.xx compared to earlier releases:
‐ A LAG is not created until a LAG is deployed using the deploy command.
‐ LACP is not started until a dynamic LAG is deployed.
‐ The number range for LAG ports is 1 to 8. For FSX third generation modules, the range is 1
to 12.
‐ A LAG is created even if a static or dynamic LAG has only one port.
• If link aggregation is configured on your device and you are upgrading to a FastIron 08.0.xx
configuration, the link aggregation configuration should have the key configured to identify the LAG. If
the key is not configured, when you upgrade to FastIron 08.0.xx, all the link aggregation interfaces
(without the key) are bundled as one misconfigured LAG. The configuration will fail if it exceeds the
supported maximum number of members per LAG limit.
• All LAG configurations are lost during downgrade.
• The trunk configuration commands (trunk ethernet , trunk deploy, trunk-cfg-ind , link-
aggregation active | passive , link-aggregation conf key) are deprecated. Instead, you can use
the new LAG configuration commands.
Considerations for devices in stack configurations
Upgrade considerations
• Hitless stacking is enabled by default for FastIron 08.0.20 and later releases. In previous releases,
hitless-failover enable must be configured. Upgrade behavior is as follows:
Considerations for devices with LAGs
FastIron Ethernet Switch Software Upgrade Guide 15
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