# Policy References

For more information about policy management, see the following resources:

- RFC 2474—Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers (December 1998)
- RFC 2475—An Architecture for Differentiated Services (December 1998)
- RFC 2697—A Single Rate Three Color Marker (September 1999)
- RFC 2698—A Two Rate Three Color Marker (September 1999)
- RFC 3198—Terminology for Policy-Based Management (November 2001)