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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 6 Software Upgrade
Manually Upgrading the ROMMON
–
From the ROMMON:
rommon> AUTO_UPGRADE_MCU=TRUE | FALSE
–
From theIOS:
Router# upgrade mcu preference [enable | disable]
Once the MCU is upgraded, the router is not reloaded. Subsequent reload versions are compared; if
the versions are same, then the MCU is not upgraded.
• If the AUTO_UPGRADE_ROMMON variable is set to FALSE, then the MCU can be upgraded as
follows:
Router# upgrade mcu file flash:image.hex
Manually Upgrading the ROMMON
Complete the following steps to manually upgrade the router ROMMON:
Step 1 Load the IOS image.
Step 2 Copy the upgradable ROMMON file ASR901_RM2.srec, to the flash memory.
Step 3 Upgrade the ROMMON using the following command:
Router# upgrade rom-monitor file flash:ASR901_RM2.srec
The router reloads and comes up with upgradable ROMMON.
Step 4 Check the status of the currently running ROMMON using any one of the following commands:
• From the ROMMON:
rommon> showmon
• From the IOS:
router> show rom-monitor
Note While upgrade is in progress, if something goes wrong like power-off or power cycler removed,
or if the erase program is not done properly, you can reset the board. It falls back to the read-only
rommon.
After the ROMMON upgrade, if you need to fall back to either the read-only ROMMON, or the upgrade
ROMMON, use any one of the following commands:
• From the IOS:
Router# upgrade rom-monitor preference readonly | upgrade
• From the ROMMON:
rommon> rommon-pref readonly