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 Procedu r es Description of Upgrade/Downgrade Terminology
clrallcnf
The MGX 8220 active ASC CLI comman d, clrallcnf, is used in place of the resetsys command as part
of a downgrade in which the configura tion information can not be mainta ined for compatibility reason s.
The clrallcnf command will terminate all Telnet sessions. You must reinitiate a Telnet session after an
ASC card returns to the active st at e.
resetsys or clrallcnf
Some standard techniques can involve releases that support downgrade without configuration loss
(compatible releases). For these rele ases, the resetsys command can be us e d. 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 th e for m at of t he configuration information. Th e f o r mat can c hange
from release to release. The new er vers io n o f firm wa re alw ay s prov id es conversion routines that
automatically reformat the con fig u ra ti on i nformation as part of an upgr ad e. How ever, there is n o
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 t o save the active ASC BRAM inform ati o n p rio r to any u p gr ad e.
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 .B R
tftp> quit
tftp shelf
tftp> bin
tftp> put AXIS_ASC_ACTIVE.BR AXIS_ASC_STANDBY.BR
tftp> quit
The active and standby A S C cards must be reset in order to run the save d c o nfi gu ration. If the
ASC BRAM revision is the sam e b et w een t he fir mwa re r evisi on s i nvolved in a downg r ad e, the ASC
configuration should be preserved (there is no need to restore the configuration).