Brocade Fabric OS Upgrade Guide (Supporting Fabric OS v7.3.0) - Manual (Page 13)

then you must export the public key to the remote host. Before running the firmwareDownload
command, you must first configure the SSH protocol to permit passwordless logins for outgoing
authentication as described in
Configuring outgoing SSH authentication .
Considerations for FICON CUP environments
To prevent channel errors during nondisruptive firmware installation, the switch CUP port must be taken
offline from all host systems.
HA sync state
High Availability (HA) synchronization occurs when two CPs in a Backbone are synchronized. This state
provides redundancy and a nondisruptive firmware download. In order for a firmware download to
successfully occur, the two CPs in a Backbone must be in sync.
If the CPs have mixed versions when you enter the firmwareDownload command, the CPs may not be
in HA sync. In this case, you must enter the firmwareDownload -s command first to upgrade or
downgrade the standby CP to the same level as the active CP, and then upgrade the CPs to the
desired version of firmware. You can also sync the firmware on the active CP to the standby CP using
the firmwaresync command.
NOTE
Do not run mixed firmware levels on CPs.
Table 4 shows the sync state of a Backbone that has different Fabric OS versions installed on the active
and standby CPs. Use the table to determine if you need to use the firmwareDownload -s command.
Backbone HA sync states TABLE 4
Active CP Fabric OS
version Standby CP Fabric
OS version HA sync state Remedy
v7.0.0 v7.0.0 inSync N/A
v7.0.0 v7.1.0 inSync N/A
v7.0.0 v7.2.0 Not inSync N/A
v7.1.0 v7.0.0 inSync N/A
v7.1.0 v7.1.0 inSync N/A
v7.1.0 v7.2.0 InSync N/A
v7.1.0 v7.3.0 Not inSync Run firmwareDownload -s on the active CP
to upgrade it to v7.3.0
v7.2.0 v7.1.0 InSync N/A
Considerations for FICON CUP environments
Fabric OS Upgrade Guide 11
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