config not loading

[gkiboneka]

i upgraded our 2500 series router flash and system memory, but now router cannot load configuation,any ideas

[zsiddiqu]

Please check your configuration register in show ver. Is the third digit from the left (after the 0x) a 4? as in 0x2142? If it is then the system is programmed to ignore the contents of NVRAM that is where the config gets stored. You have to be careful though to not lose the configuration permanently. Here are the steps to salvage the configuration from NVRAM (assuming its still there) and then program the system to load the configuration at next reboot. These steps are assuming that the problem is due to the configuration register set to ignore nvram.

1. go to enable mode in the router and type 'config mem'

2. go to config mode and type 'config-register 0x2102'

3. exit out to enable mode (from config mode) and type 'write mem' to save your changes.

You do not HAVE to reload the router at this point, unless you want to make sure tha the router is able to hold the config after a reboot.

If you have already verified the config register to be correct (to load config from NVRAM) then try putting in a simple config and see if the router remembers that config. If not then your router may have bad nvram.

[Frederic Vanderbecq]

Check the router config-register. If it is something like 2142 or 142 or 2042 or 42, it means the config will be ignored upon reboot. You can then try to change it to 2102 for example and reload the router (after properly saving the configuration). If that still fails, it looks like the NVRAM is dead.