Found this info on cco. Couldnt find info on router specifically, but on the switch instead. See if the router supports [service compress-config]. hope it helps.
Managing Software Images and Working with Configuration Files on Catalyst Switches
32768 bytes total (28081 bytes free)
Router#
Router# write memory
Building configuration...
% Configuration buffer full, can't add command: ip prefix-list CBB_out
% Aborting Save. Compress the config.[OK]
Cannot execute compress-config :
The 3550 switch does not support compressing the configuration file, as shown below.
Router(config)# service compress-config
Boot ROMs do not support NVRAM compression.
Disabling service compress-config.
The workaround is to save the running configuration file in the flash: device and use the boot config-file command to instruct the router boot from that file on re-load instead of nvram:.
The solution is to use the boot buffersize <size> configuration command to increase the size of the simulated NVRAM. The configuration file cannot be larger than the buffer size allocation. The range is from 4096 to 524288 bytes.
Note: The 3550 switch configuration needs to be reloaded using the reload command or cold booted before the new simulated NVRAM takes effect.
After using the boot buffersize command it is no longer necessary to use the workaround described earlier, as the boot buffersize command simulates a larger NVRAM.
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