16. L. Martini et al., Encapsulation Methods for Transport of Layer 2 Frames over
MPLS, February 2001 (currently at version 17, January 2006): draft-martinil2circuit-
encap-mpls-01.txt.
17. L. Martini et al., Transport of Layer 2 Frames Over MPLS, May 2000 (currently
at version 17, January 2006): draft-martini-l2circuit-trans-mpls-01.txt.
18. P. Pan, Dry-Martini: Supporting Pseudo-wires in Sub-IP Access Networks, July
2005: draft-pan-pwe3-over-sub-ip-01.txt.
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Chapter 12
Resilient Packet Ring (RPR)
by Mannix O??™Connor
The IEEE 802.17 Resilient Packet Ring standard (RPR) defines a new media access
control (MAC) to accesses ring topologies using the resilient packet ring (RPR) protocol.
RPR is intended to be used in metropolitan/regional area networks (MAN) and wide
are a networks (WAN) for efficient transfer of data packets at rates scalable to multiple
Gigabits per second.
The main features of RPR include:
?– Support for up to 255 stations per ring
?– Optimization for rings with a maximum circumference of 2000 Km
?– Support for unicast, multicast, and broadcast traffic
?– Multiple (three) classes of service
?– Increase usable bandwidth beyond those of existing technologies
?– Provide weighted fairness between all the stations on the ring
?– Automatic topology and station discovery and capability for plug and play
?– Robust frame transmission:
?– Service restoration in less than 50 ms
?– Lossless MAC
?– No single point of failure
?– Operation, Administration, and Maintenance (OAM) features
The services provided by the MAC sublayer allow the local MAC client to exchange
data with peer client entities in other stations, and to exchange parameters to control
the operation of the local MAC entity.
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