You can find information on differentiated services and quality of service from print and online sources.
For more information on quality-of-service theory and practice, refer to the following books:
Ferguson, Paul and Geoff Huston. Quality of Service. John Wiley & Sons, Inc., 1998.
Kilkki, Kalevi. Differentiated Services for the Internet. Macmillan Technical Publishing, 1999.
IPQoS conforms to the specifications that are described in the following RFCs and Internet drafts:
RFC 2474, Definition of the Differentiated Services Field, which describes an enhancement to the ToS or DS fields of the IPv4 and IPv6 packet headers to support differentiated services.
RFC 2475, An Architecture for Differentiated Services, which provides a detailed description of the organization and modules of the diffserv architecture.
RFC 2597, Assured Forwarding PHB Group, which describes how the assured forwarding (AH) per-hop behavior works.
RFC 2598, An Expedited Forwarding PHB, which describes how the expedited forwarding (EF) per-hop behavior works.
Internet-Draft, An Informal Management Model for Diffserv Routers, which presents a model for implementing the diffserv architecture on routers.
The Differentiated Services Working Group of the IETF maintains a Web site with links to diffserv Internet drafts at http://www.ietf.org/html.charters/diffserv-charter.html.
Router manufacturers such as Cisco Systems and Juniper Networks provide information on their corporate Web sites that describes how differentiated services are implemented on their products.
The IPQoS distribution includes the following man pages.
ipqosconf(1m), which is the command for setting up the IPQoS configuration file
ipqos(7ipp), which describes the IPQoS implementation of the diffserv architectural model
ipgpc(7ipp), which describes the IPQoS implementation of a diffserv classifier
tokenmt(7ipp), which describes the IPQoS tokenmt meter module
tswtclmt(7ipp), which describes the IPQoS tswtclmt meter module
dscpmk(7ipp), which describes the DSCP marker module
dlcosmk(7ipp), which describes the IPQoS 802.1D user priority marker module
flowacct(7ipp), which describes the IPQoS flow-accounting module
acctadm(1m), which is the command that configures the Solaris extended accounting facilities and now includes IPQoS extensions