Is there a limit size for Radius Class attribute that may be used with the R3000?

The Radius Class attribute has a limitation size of 253 bytes excluding the 'attribute' and 'length' 2 bytes, therefore, in the event that you have a profile that is too long to fit in the Class attribute, then we recommend on creating a Rule on the R3000 that would represent the particular combination of blocked / passed categories, and send the Rule# in the Radius string.