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SBM is a signaling scheme that provides a method for mapping an Internet-level setup protocol such as RSVP onto IEEE 802-style networks. In particular, it describes the operation of RSVP- enabled hosts/routers and link layer devices (switches and bridges) to support reservation of LAN resources for RSVP-enabled data flows. For example, it can signal 802.1p priorities between network switches or class of service information between RSVP clients and RSVP networks. SBM is described in RFC 2814 (SBM-Subnet Bandwidth Manager: A Protocol for RSVP-Based Admission Control over IEEE 802-Style Networks, May 2000).

For example, SBM is implemented in Microsoft Windows 2000 through ACS (Admission Control Service), which is a QoS component that regulates subnet usage for QoS-enabled applications. The ACS exerts its authority over QOS-aware applications or clients by intercepting RSVP messages and passing the messages' policy information to LPMs (Local Policy Modules) for authentication.

See "QoS (Quality of Service)," "RSVP (Resource Reservation Protocol)," and "Policy-Based Management."

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