Spectrum NCM is not able to display differences for device captures for devices with large configurations having more than 20,000 lines. How can Spectrum capture and show the difference of a device with thousands of lines in the config?
There is a configuration entry in $SPECROOT/NCM/config.xml file to allow the diffs and large captures.
Change this entry to on:
<diff-largefile type = "java.lang.String" >off</diff-largefile>
Kill the NCMService process. Processd will automatically start it back up.