High Quality Content by WIKIPEDIA articles! Stream Reservation Protocol (SRP) is an enhancement to Ethernet that implements admission control. SRP has been standardized as IEEE 802.1Qat. SRP defines the concept of a streams at layer 2 of the OSI model. Also provided is a mechanism for end-to-end management of the streams` resources, so as to guarantee Quality of Service (QoS). Unlike Resource reSerVation Protocol (RSVP), SRP works for multicast streams.