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Resilient Packet Ring
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== Spatial reuse == Another concept within RPR is what is known as ''spatial reuse''. Because RPR strips the signal once it reaches the destination (unlike a SONET UPSR/SDH [[Subnetwork Connection Protection|SNCP]] ring, in which the bandwidth is consumed around the entire ring) it can reuse the freed space to carry additional traffic. The RPR standard also supports the use of learning bridges ([[IEEE 802.1D]]) to further enhance efficiency in point to multipoint applications and VLAN tagging ([[IEEE 802.1Q]]). One drawback of the first version of RPR was that it did not provide spatial reuse for frame transmission to/from [[MAC address]]es not present in the [[ring topology]]. This was addressed by [[IEEE]] 802.17b, which defines an optional ''spatially aware sublayer'' (''SAS''). This allows spatial reuse for frame transmission to/from MAC address not present in the ring topology.
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