Joint IEEE-SA and ITU Workshop on Ethernet. Stream Reservation Protocol (SRP) Craig Gunther Senior Principal Engineer Harman International
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1 Joint IEEE-SA and ITU Workshop on Ethernet Stream Reservation Protocol (SRP) Craig Gunther Senior Principal Engineer Harman International
2 What is SRP? The dynamic control protocol used to create a path through a network for rank-based, latency guaranteed bandwidth reservations within a heterogeneous Cloud IEEE wired Ethernet IEEE Wi-Fi MoCA (Multimedia over Coax Alliance) 2
3 What is SRP (continued)? Bridges do not allow a reservation unless they can provide the requested QoS Part of the 2011 Protocol Suite 802.1AS: GENERALIZED PRECISION TIME PROTOCOL 802.1Qav: CREDIT BASED SHAPER (Q:34) 802.1Qat: STREAM RESERVATION PROTOCOL (Q:35,C) 802.1BA: AUDIO VIDEO BRIDGING () SYSTEMS 3
4 SRP terminology TALKER: Source of a stream LISTENER: Destination for a stream DOMAIN: A connected set of Talkers, Listeners, and Bridges that support the same priority for an SR class RESERVATION: A network path between a Talker and its Listener(s) that supports the requested QoS 4
5 Reservation Process A simple three step process: 1. Establish a Domain 2. Talker Advertises a stream 3. Listener(s) Attach to the stream 5
6 How do SRP Domains work? Establish the Domain Boundary (Q:34.2*) Must have same priority value for SR class, otherwise it s a boundary, and: Conflicting ingress priority is regenerated to protect SR class priorities and queues (Q:6.9.4) Talker Advertise -> Talker Failed (Q: ) Note: The Cloud is an intersection of an SRP Domain and a gptp (802.1AS) Domain. * Q:34.2 is a reference to 802.1Q-2011 Clause
7 Four Domain example station 8 domain 1 station 3 station 5 domain 2 station 7 SR class A uses priority 3 station 1 AV Bridge 1 AV Bridge 5 SR class A uses priority 5 station 2 domain 3 AV Bridge 6 AV Bridge 2 SR class A uses priority 3 station 10 SR class A uses priority 4 station 4 station 6 domain 4 AV Bridge 3 station 9 AV Bridge 4 domain domain boundary port LAN carrying non- traffic LAN carrying traffic Non- station 11 7
8 How do SRP Reservations work? TALKER and BRIDGE(S) Stream Registration Talkers advertise one or more streams and specify the QoS requirements Bridges propagate those advertisements throughout the network 8
9 How do SRP Reservations work? LISTENER and BRIDGE(S) Stream Attach Listener(s) request the stream Bridges Add associated ports to VLAN Membership Nail-up the path and configure the stream shaper and traffic forwarding Update streamage Forward Listener Ready toward Talker 9
10 Reservation process Talker Advertise propagates everywhere Listener Ready propagates towards Talker Talker #1 Listener #1 Advertise s1 Ready S1 Advertise s1 Stream S1 Cloud Listener #n Advertise s1 Ready S1 Talker + Listener Advertise s1 Advertise s1 Talker #n 10
11 Who uses SRP today? Professional Audio products Installed Sound (airports, churches, theaters, amusement parks, sports venues) Portable PA (club bands) Tour Sound (outdoor concerts, touring bands) Automotive Infotainment Control and Command - eventually Industrial Control 11
12 What s next for SRP? 12
13 Requests from current SRP users Automotive Statically define reservations Faster startup times 10x to 100x reduced packet rates Traffic shaper selection (A/V vs control) 13
14 More Requests Professional, Industrial and Consumer Configurable SR classes, priorities and default VLAN-IDs Support link aggregation Explicit path selection Latency and Energy Efficient Ethernet Support for Layer 3 Two-way reservations Multiple Talkers per stream 14
15 IEEE 802.1Qcc Requesting authorization for new work PAR: 5C: Targeted for 2017 completion 15
16 THANK YOU 16
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