R3303-HP HSR6800 Routers High Availability Configuration Guide

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Configuring RPR
RPR overview
Resilient Packet Ring (RPR) is a new MAC layer protocol designed for transferring mass data services over
MANs. It can operate on synchronous optical network/synchronous digital hierarchy (SONET/SDH),
Dense Wavelength Division Multiplexing (DWDM) and Ethernet to provide flexible and efficient
networking schemes for broadband IP MANs carriers. The RPR technology delivers these benefits:
• Physical layer diversity.
• High bandwidth utilization.
• Multicast and broadcast support.
• Automatic topology discovery and plug-and-play for stations.
• Quick protection mechanism, and 50 ms self-healing with topology protection.
• Traffic level guarantee based on bandwidth reservation and rate limiting.
• Bandwidth sharing fairness among stations on the ring.
Ring structure of RPR
RPR is made up of dual unidirectional counter-rotating ringlets identified as Ringlet 0 and Ringlet 1, as
shown in Figure 11.
Figure 11 Ring structure of RPR
Ringlet 0, also called the "outer ring," is for clockwise or west data traffic. Ringlet 1, also called the "inner
ring," is for counterclockwise or east data traffic.
On Ringlet 0, stations send data frames out of east ports and receive data frames from west ports. On
Ringlet 1, stations send data frames out of west ports and receive data frames from east interfaces.
Any two adjacent stations are connected by a pair of unidirectional logical channels called "links"
transmitting in opposite directions. These two links form a span. Multiple continuous spans and their
stations form a domain. A span on which data frames are not allowed to pass is called an "edge." If a