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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 Graceful Upgrade and Downgrade Procedures
Procedure 24—Graceful Downgrade, 1-Co re Ca rd Set (SM only)
Procedure 24 is used for 4.x to 4.y, 4x to 5.x, and 5.x to 5.y.
Step 1 Check compatibility.
With any downgrade technique, there is a lway s t he issue of compatibility. Any release c an b e
downgraded to any othe r release, but in many in s tan c e s configuration infor m at io n will be lost.
Hardware incompatibilities can p r event s om e d owng ra de s. F or exa mple, 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 ca rds or serv ice re sour ce modu le 3T3 c ards cann ot be do wn grade d
to Release 2 or Release 3. C heck the compatibility m at ri x to d etermine if a particular down g ra de is
supported and how it affects configurat io n lo s s.
Step 2 Save the current ASC configuration. Perform this step for the ASC prior to upgrading the firmware.
First reset the card, then u se T FTP 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) co nfiguration for each primary and stand- alone SM. Perform this
step for the SM prior to upgrading the firmware.
First reset the card, then u se T FTP 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 shou ld not be cha nged duri ng the upgr ade or downgr ade proc ess. Use this
step to examine the number of sh elf c on n ect io ns. A similar step can be made to ex am i ne th e same
configuration parameters after t he u pg rad e o r dow n grad e and, therefore, it can be estab lish ed t ha t t he
configuration has remained the same.
Step 5 For all SMs, set the start and en d ad dresses in Flash memory wher e the firmware file will be written.
a. Enter the tftp put <SM_BT_file> AXIS_SM_1_$slot.BOOT command.
b. Enter the chkflash command. This command ca lculates and compares the Flash ch ecksum to verify
whether the boot code is correct.
c. Enter the version command. This command displays the version of the boot code currently stored
in Flash memory. This ste p dow nloads new firmware int o th e ASC.
Step 6 For all SMs
a. Enter the tftp put <SM_FW_file> AXIS_SM_1_$slot/0.FW command.
b. Check the file size of the download ed firmw ar e. Use this step to check that the fir mw ar e w as
downloaded successfully to the ASC disk.
c. Enter the dspfwrevs command to verify the correct firmware revision.
Step 7 For all stand-alone SMs, enter the resetcd <stand-alone_SM> command.
Step 8 For all primary SMs in all redundancy groups
a. Enter the resetcd <primary_SM> <secondary_SM> command.
b. Enter the resetcd <secondary_SM> <primary_SM> command.