My Router (7600)(SUP 720G) NVRAM is corrupt and now I want to load my startup config from flash.

I have already used these Commands but no help.

copy running-config disk1:RAM

and also used this command to set my default boot config to flash by this

config#boot config disk1:RAM

i have also run the earlier command of copy again to save the boot config command in running config.
when i reload the router my all configs are lost because it doesn't take them from flash and i loss remote access.

  • You need to be in configure mode, before you can use the command boot example: 1. copy running-config bootdisk: and 2. configure terminal then (config)#boot config bootdisk:<config name> or (config)#boot config disk0:<config name> that should do it. You can check the boot configuration by using show bootvar. CONFIG_FILE variable =
    – user36472
    Sep 20, 2017 at 10:42
  • Router#show bootvar BOOT variable = CONFIG_FILE variable = bootdisk:running-config BOOTLDR variable does not exist Configuration register is 0x8000 (will be 0x2102 at next reload)
    – Tehmas
    Sep 21, 2017 at 5:45
  • CONFIG_FILE variable should change after using (config)#boot config disk1:RAM.
    – user36472
    Sep 21, 2017 at 6:00

1 Answer 1


We solved this problem by replacing lithium batteries in SUP720. Now Router is taking startup configuration from NVRAM smoothly and also loading it into the RAM. We Replaced both RP and RS batteries using these instructions by Cisco.

For More info check this LInk from Cisco.Thank you https://www.cisco.com/c/en/us/support/docs/field-notices/641/fn64131.html

  • You should accept your answer so that the question doesn't keep popping up forever, looking for an answer.
    – Ron Maupin
    Sep 21, 2017 at 13:18
  • 1
    wow now there's a gotcha! batteries! on a sup720! Sep 21, 2017 at 18:48

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