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C-47
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Appendix C Firmware Upgrade and Downgrade Procedures
Description of Upgrade/Downgrade Terminology
clrallcnf
The MGX 8220 active ASC CLI command, clrallcnf, is used in place of the resetsys command as part
of a downgrade in which the configuration information can not be maintained for compatibility reasons.
The clrallcnf command will terminate all Telnet sessions. You must reinitiate a Telnet session after an
ASC card returns to the active state.
resetsys or clrallcnf
Some standard techniques can involve releases that support downgrade without configuration loss
(compatible releases). For these releases, the resetsys command can be used. For releases that involve
configuration loss, the clrallcnf command should be used.
Save/Restore ASC Configuration
The ASC card stores ASC configuration information in BRAM (battery-backed RAM). The BRAM
contains a revision that identifies the format of the configuration information. The format can change
from release to release. The newer version of firmware always provides conversion routines that
automatically reformat the configuration information as part of an upgrade. However, there is no
support for reformatting as part of a firmware downgrade.
Upgrade/Downgrade
If the BRAM revision is different between the firmware revisions involved in an upgrade, the active
ASC BRAM information should be saved prior to the upgrade using:
tftp shelf
tftp> bin
tftp> get AXIS_ASC_ACTIVE.BR
tftp> quit
In general, it is recommended to save the active ASC BRAM information prior to any upgrade.
If the BRAM revision is different between the firmware revisions involved in a downgrade, the active
and standby ASC BRAM information should be restored following the downgrade using:
tftp shelf
tftp> bin
tftp> put AXIS_ASC_ACTIVE.BR
tftp> quit
tftp shelf
tftp> bin
tftp> put AXIS_ASC_ACTIVE.BR AXIS_ASC_STANDBY.BR
tftp> quit
The active and standby ASC cards must be reset in order to run the saved configuration. If the
ASC BRAM revision is the same between the firmware revisions involved in a downgrade, the ASC
configuration should be preserved (there is no need to restore the configuration).