802.1p - Computer Definition
The IEEE specification (September 1998) that enables LAN switches and other devices (e.g., bridges and hubs) to prioritize traffic into one of eight classes. Class 7, the highest priority, is reserved for network control data such as Open Shortest Path First (OSPF) and Routing Information Protocol (RIP) table updates. Classes 6 and 5 can be used for voice, video, and other delay-sensitive traffic. Classes 4 through 1 address streaming data applications through loss-tolerant traffic such as File Transfer Protocol (FTP). Class 0, the default class, is a best effort class. In conjunction with the 802.1q specification for VLAN tagging, 802.1p paved the way for standards-based multivendor grade of service (GoS). See also FTP, GoS, IEEE, LAN, OSPF, RIP, and VLAN.
An IEEE standard for providing quality of service (QoS) in 802-based networks. 802.1p uses three bits (defined in 802.1q) to allow switches to reorder packets based on priority level. It also defines the Generic Attributes Registration Protocol (GARP) and the GARP VLAN Registration Protocol (GVRP). GARP lets client stations request membership in a multicast domain, and GVRP lets them register into a VLAN. See IEEE 802 and QoS.