IEEE 802 17 The Resilient Packet Ring Protocol

IEEE 802. 17 The Resilient Packet Ring Protocol John Lemon jl_17_itu_geneva Chair IEEE 802. 17

Agenda n n n RPR Basics Key Features Multi-PHY Ethernet Transport Ring RPR Frame Structure Current Work: Multiring Protection jl_17_itu_geneva 2

RPR Basics n n Created to standardize carrier-class packet ring transport Working Group active since 2000 n n n Resiliency n n Sub-50 ms protection Plug and play n n n Base standard published in 2004 802. 17 a published in 2004 802. 17 b published in 2007 802. 17 c in progress Automatic discovery of capabilities and topology Automatic configuration of capabilities Scalable n n From STM-1 through STM-64, 1 GE, 10 GE Up to 255 stations per ring jl_17_itu_geneva 3

Key Features n Automatic congestion management n n n Topology and configuration discovery n n n Simple, automatic operation Provides plug-and-play Advanced protection scheme n n n Service classes vs. priority Fair access to the ring Multiple methods from one scheme Takes advantage of predetermined topology Spatial Reuse n For routed and bridged networks jl_17_itu_geneva 4

Multi-PHY n n PHY (transport) agnostic Uses Ethernet PHY, SONET PHY, or SDH PHY Same behavior regardless of underlying physical layer Additional PHYs easy jl_17_itu_geneva 5

Ethernet Transport Ring n Ethernet frames travel through RPR ring unchanged jl_17_itu_geneva 6

RPR Frame Structure n n RPR header containing ring addressing information and RPR frame control Original Ethernet frame (including FCS) jl_17_itu_geneva 7

Current Work: Multiring Protection n n Protected Inter-Ring Connection (PIRC) Similar in concept to SONET/SDH DNI P 802. 17 c underway Extends resilience of RPR from one ring to multiring networks jl_17_itu_geneva 8