A temporary workaround may be to disable the LLDP time filters on the device:
set snmp timefilter break
If this is not possible or does not resolve the issue due to the number of entries in the LLDP table, then CA engineering has created a fix for the XpedSwRtr modeltype. The code will skip the extensive timefilter table reads in the LLDP tables. This fix is available in debug patch Spectrum_10.02.00.D156. This fix is also tentatively scheduled to be included out of the box with the next release of CA Spectrum after 10.2.1.
If you need Spectrum_10.02.00.D156 please open a case with CA Spectrum Support. The release notes show:
The SS starts consuming memory and runs out during discovery of LLDP.