IEEE 802.1Qca Path Control and Reservation Joint IEEE-SA and ITU Workshop on Ethernet IEEE 802.1Qca Path Control and Reservation János Farkas, Ericsson Geneva, Switzerland, 13 July 2013

Path Control and Reservation (PCR) Outline Background Shortest Path Bridging (SPB) [IEEE 802.1aq, IETF RFC 6329] Path Control and Reservation (PCR) P802.1Qca project goals Explicit Path (EP) establishment Support for reservation and redundancy Geneva, Switzerland,13 July 2013

Background – Shortest Path Forwarding BR A BR A BR C BR B BR D BR E BR A BR E BR B BR E BR B BR D BR C BR D BR C SPB Shortest Path Bridging RSTP Rapid Spanning Tree Protocol RSTP Rapid Spanning Tree Protocol MSTP Multiple Spanning Tree Protocol MSTP Multiple Spanning Tree Protocol Shortest Path Bridging (SPB): each bridge has its own Shortest Path Tree (SPT) Frame forwarding is on the shortest path Geneva, Switzerland,13 July 2013

Background – Shortest Path Bridging IEEE 802.1aq SPB is an add-on to IS-IS Single link state control for large networks Scalability High degree of automation Deterministic multi-path routing for unicast and multicast Fast convergence All 802.1 standards supported, e.g. CFM MEF services natively provided E-LINE, E-TREE, E-LAN Geneva, Switzerland,13 July 2013

IEEE P802.1Qca Path Control and Reservation (PCR) Extend IS-IS for bridges beyond shortest path capabilities Explicit paths Bandwidth and stream reservation Redundancy for data flows (protection, restoration) Distribution of control parameters for time synchronization and scheduling Geneva, Switzerland,13 July 2013

Explicit Paths Explicit Paths(EP) are determined by Path Computation Element(s) (PCE) Point-to-point Multipoint (point-to-multipoint or multipoint-to-multipoint IS-IS installs the explicit paths Single PCE e.g. data center network; PCE: application on a VM Multiple PCEs e.g. time-sensitive network; PCE: application on bridges PCE VM: Virtual Machine Ctrl PDUs IS-IS PCE PCE IS-IS Path 1 Path 1 EB 1 EB 4 EB 4 EB 1 CB 5 Server Path 2 Host 2 Host 1 EB 3 Path 2 EB 2 EB 3 Path 3 EB 2 Host 4 Host 3 Geneva, Switzerland,13 July 2013

IS-IS Support for Reservation and Redundancy IS-IS support for Stream Reservation Protocol (SRP) PCE + IS-IS  Explicit Path SRP  Reservation along EP Basic reservation by IS-IS (1 PCE) Redundancy Maximum disjoint paths for protection PCE + IS-IS  Explicit Paths Protection mechanism on top of the EPs Loop Free Alternates (LFA): reroute in a few ms IS-IS PCE Request Topology etc. Path(s) Geneva, Switzerland,13 July 2013

Thank You! Geneva, Switzerland,13 July 2013