Procedure 12-Standard Downgrade, 2-Core Card Set - Cisco MGX 8220 Installation And Configuration Manual

Standard Upgrade and Downgrade Procedures
Use this step to examine the number of 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 the ASC and SM configurations if necessary.
Procedure 12—Standard Downgrade, 2-Core Card Set
Procedure 12 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 stand-alone and primary SMs
a.
b.
c.
d.
e.
Cisco MGX 8220 Installation and Configuration
C-20
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.
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 switchcc command to switch to the other ASC.
Appendix C Firmware Upgrade and Downgrade Procedures
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003