Dell Brocade 6510 Fabric OS Administrator's Guide v7.1.0 - Page 257
Upgrading and downgrading firmware, Passwordless firmware download
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Firmware download process overview 9 Upgrading and downgrading firmware Upgrading means installing a newer version of firmware. Downgrading means installing an older version of firmware. In most cases, you will be upgrading firmware; that is, installing a newer firmware version than the one you are currently running. However, some circumstances may require installing an older version; that is, downgrading the firmware. The procedures in this section assume that you are upgrading firmware, but they work for downgrading as well, provided the old and new firmware versions are compatible. Always reference the latest release notes for updates that may exist regarding downgrades under particular circumstances. For details on Administrative Domains and the firmware download process, refer to Chapter 17, "Managing Administrative Domains" for more information. For details about testing and restoring firmware, refer to "Testing and restoring firmware on Backbones" on page 270. Passwordless firmware download You can download firmware without a password using the sshutil command for public key authentication when SSH is selected. The switch must be configured to install the private key, and 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" on page 181. 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. NOTE Do not run mixed firmware levels on CPs. Table 49 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. Fabric OS Administrator's Guide 257 53-1002745-02
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