Procedure 24-Graceful Downgrade, 1-Core Card Set (Sm Only - Cisco MGX 8220 Installation And Configuration Manual

Appendix C Firmware Upgrade and Downgrade Procedures
Procedure 24—Graceful Downgrade, 1-Core Card Set (SM only)
Procedure 24 is used for 4.x to 4.y, 4x to 5.x, and 5.x to 5.y.
Check compatibility.
Step 1
With any downgrade technique, there is always the issue of compatibility. Any release can be
downgraded to any other release, but in many instances configuration information will be lost.
Hardware incompatibilities can prevent some downgrades. For example, Release 2 and Release 3
service modules require two Flash chips. Release 4 SMs will be shipped with a single Flash chip. A
Release 4 shelf containing BNM-E1 cards or service resource module 3T3 cards cannot be downgraded
to Release 2 or Release 3. Check the compatibility matrix to determine if a particular downgrade is
supported and how it affects configuration loss.
Step 2 Save the current ASC configuration. Perform this step for the ASC prior to upgrading the firmware.
First reset the card, then use TFTP get to save the card's current configuration in the workstation.
tftp shelf
tftp> bin
tftp> get AXIS_ASC_ACTIVE.BR
Step 3 Save the current service module (SM) configuration for each primary and stand-alone SM. Perform this
step for the SM prior to upgrading the firmware.
First reset the card, then use TFTP get to save the card's current configuration in the workstation.
tftp shelf
tftp> bin
tftp> get AXIS_SM_1_<slot>.PRI.<service password>
Step 4 For all primary and stand-alone SMs, enter the dsptotals command.
The configuration of the shelf should not be changed during the upgrade or downgrade process. Use this
step to examine the number of shelf connections. A similar step can be made to examine the same
configuration parameters after the upgrade or downgrade and, therefore, it can be established that the
configuration has remained the same.
For all SMs, set the start and end addresses in Flash memory where the firmware file will be written.
Step 5
a.
b.
c.
Step 6 For all SMs
a.
b.
c.
For all stand-alone SMs, enter the resetcd <stand-alone_SM> command.
Step 7
For all primary SMs in all redundancy groups
Step 8
a.
b.
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Enter the tftp put <SM_BT_file> AXIS_SM_1_$slot.BOOT command.
Enter the chkflash command. This command calculates and compares the Flash checksum to verify
whether the boot code is correct.
Enter the version command. This command displays the version of the boot code currently stored
in Flash memory. This step downloads new firmware into the ASC.
Enter the tftp put <SM_FW_file> AXIS_SM_1_$slot/0.FW command.
Check the file size of the downloaded firmware. Use this step to check that the firmware was
downloaded successfully to the ASC disk.
Enter the dspfwrevs command to verify the correct firmware revision.
Enter the resetcd <primary_SM> <secondary_SM> command.
Enter the resetcd <secondary_SM> <primary_SM> command.
Graceful Upgrade and Downgrade Procedures
Cisco MGX 8220 Installation and Configuration
C-39