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Graceful Upgrade and Downgrade Procedures
Step 9
For all primary and stand-alone SMs in all redundancy groups, enter the dsptotals command.
This step is to examine the number of shelf connections, lines, ports, and channels after the upgrade or
downgrade. The values can be compared to those before the download and, therefore, it can be
established that the configuration has remained the same. Restore ASC and SM configurations if
necessary.
Procedure 25—Graceful Upgrade, 2-Core Card Set
Procedure 25 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
Enter the dspadrcxat command. Note the value of the ConnNumOfValidEntries parameter.
This value indicates the number of connections. This command is run again at the end of the procedure
to ensure that the number of connections has not changed.
Step 5
For all primary and stand-alone SMs
a.
b.
c.
Cisco MGX 8220 Installation and Configuration
C-40
Enter the dsptotals command.
The configuration of the shelf should not be changed during the downgrade process. Use this step
to examine the number of lines, ports, and channels before the upgrade or downgrade. 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.
Enter the tftp put <ASC_BT_file> AXIS_ASC_BACKUP.FW command. This step downloads the
new boot code into the ASC.
Enter the chkflash command. This command calculates and compares the Flash checksum to verify
whether the boot code is correct.
Appendix C
Firmware Upgrade and Downgrade Procedures
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
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