# RADIUS Attribute Quick Reference

This appendix presents RADIUS attribute quick reference tables listing RADIUS attributes and their relationships to generated RADIUS packets and the dictionaries to which they belong.

The following table describes the indicators used in the quick reference table.

Entry | Description
--- | ---
0 | The AVP MUST NOT be present in the message.
0-1 | Zero or one instance of the AVP MAY be present in the message. If there are more than one instance of the AVP, it is considered an error.
0+ | Zero or more instances of the AVP MAY be present in the message.
1 | One instance of the AVP MUST be present in the message.

Attributes not listed in a particular table do not appear in RADIUS packets generated for a session of the corresponding service.

For the RADIUS attribute quick reference tables, click here.