Complete Protocol dictionary, glossary and reference
RPR: Resilient Packet Ring
Resilient Packet Ring (RPR), defined by the IEEE's 802.17 working group, is a Layer 2 MAC-based technology to bring SONET-like abilitites to metro Ethernet networks, by adding support for a ring topology and fast recovery from fiber cuts and link failures at Layer 2. RPR uses Ethernet switching and a dual counter-rotating ring topology to provide SONET-like network resiliency and optimized bandwidth usage, while delivering multipoint Ethernet/IP services. RPR maintains its own protection scheme and uses physical-layer alarm information and Layer 2 protocol communications to detect node and/or link failures. When a failure is detected, the RPR switching mechanism restores networks in less than 50 milli-seconds.