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No Support for Ring Topologies
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The Ethernet MAC is specified for mesh and point-to-point topologies Ring structures are prohibited to prevent endless circulation of errored, rogue, or misdirected packets There are Ethernet devices that can be connected in a ring configuration, however they do not conform to the IEEE 8023 protocol in this respect Ring topologies have practical benefits and are frequently deployed in carrier networks They, (1) uses less fiber than mesh or hub and spoke configurations and (2) in most cases are simpler and quicker to restore in the event of failure
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A key consideration in carrier networks is protection and restoration Ethernet has protection mechanisms, Spanning Tree and Rapid Spanning Tree, but these hierarchical and mesh restoration schemes do not converge fast enough for networks with strict Service Level Agreements
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Protection and topology discovery protocols are tightly related to each other Protection information is used to update the topology data base, and a common frame carries information relevant to both functions Topology discovery provides a reliable and accurate means for all stations on a ring to discover the topology of the stations on the ring, and any changes to that topology It also provides a mechanism for rapid detection of topology changes, and a mechanism to convey additional node information to the other nodes on the ring
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Mechanisms that control delay and delay variation are crucial for networks that deliver IPTV and voice services In a network of 3 or more switches, connected serially, there is no provision within the 8023 MAC to ensure packets on the network are delivered Ethernet LANs require retransmission of dropped or lost packets or induce significant delay due to queuing However, carrier networks cannot maintain SLAs or quality of user experience for consumers of IPTV or voice services if they encounter significant amount of lost packets or packet delay and variation
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The 8023 MAC has no signaling mechanism among devices to communicate the congestion state of other switches on the network This lack of visibility often leads to unexpected congestion on individual links In addition, due to head of line blocking customers that are closest to their destination, a Central Office for instance, will receive better service than those that are farther away To overcome these issues, fairness algorithms are built into the RPR protocol These messages are part of the RPR header and tell the MAC how to treat each packet The various classes and sub classes can be used to create any service profiles appropriate for any application High priority, guaranteed traffic is never subject to fairness High priority traffic always gets the bandwidth assigned to it, always receives priority on the ring and is therefore never subject to delay or delay variation The fairness algorithm ensures weighted dynamic distribution of available link bandwidths to source stations using those links This feature enables two real benefits One, it allows users to burst into any unused network capacity and get high throughput in these instances Secondly, it ensures that no service is ever starved of bandwidth, since some network managers can always reserve a portion of the ring bandwidth for Best Effort traffic RPR is the only standardized packet-based Layer 2 mechanism for ring topologies that provides both the resilience and jitter/delay control necessary for the voice and video services increasingly desired by telecommunications subscribers Public carriers prefer and often require standards based products to facilitate interoperability and to ensure they are not dependent on a single supplier
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Resilient Packet Ring (RPR)
When Does this Solution Fit
RPR is not normally applied as a service or technology by itself RPR s primary role comes into play at the first point where customers are aggregated at central facilities owned by the service provider It makes the access from business and consumers more robust and ensures that subscribers SLAs are enforced and maintained Aggregation could occur at a DSLAM for DSL subscribers, a CMTS for cable subscribers, an ADM for SONET/SDH access, PON for new fiber builds or a L2/L3 Ethernet switch for Ethernet access Any of these technologies can be aggregated onto an RPR ring In addition many private Enterprise networks are built on RPR rings using the technologies mentioned above, however, the facilities are wholly owned by the Enterprise rather than by the service provider As such they are dedicated to a single company and not shared among many customers Terminating these access technologies into an RPR network provides a number of benefits for the customer of TDM and data services These are discussed next
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