RPR was initially designed to support QoS, Availability, Management, and many of
the key characteristics required in this new networking environment. Still there are
developments that are being implemented to deliver even greater functionality from the
protocol. Some of these are being done within the standards organizations and others
are being done by vendors seeking to deliver more functionality within their devices.
Within the IEEE 802.17 there is work being done to improve the spatial reuse capabilities
of the RPR ring. 802.17b defines two types of connections: directed and undirected.
This has to do with efficient use of bandwidth when a remote address is
not known by any of the RPR nodes. If the relationship between a remote address
and an RPR station address has not been established the frames will be flooded using
undirected transmission. As soon as the location of the remote node is learned
directed transmission is used. This way unknown frames travel the minimum hops to
reach their destination. Another standard based approach to this issue is to use MPLS
Pseudowires to interconnect RPR rings. Both of these approaches bring the ability to
maintain both availability and QoS between multiple rings.
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