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Restoration in less than 50 ms Quick dissemination of changes in the protection state Support of a comprehensive protection hierarchy Dynamic addition and removal of stations Topology and protection frame loss tolerant No need for a master or a management station
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Assurance of topology image conversion for all stations Context containment for strict order traffic Support of revertive and non-revertive operation Closed and open ring topologies Scalable to 255 stations Means to share additional information between stations Requires insignificant ring traffic Consumes minimal software execution time Requires minimal hardware
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The standard defines two protection mechanisms: Steer (mandatory) and Wrap (optional) Steering stations direct unicast traffic onto ringlet0 or ringlet1 on a per destination basis, to avoid failed spans Multicast frames are sent in both directions, with the ttl set to the number of stations to the defective span, on each ringlet As illustrated in Figure 1210, station S2 normally sends to station S6 via the ringlet0 After the fiber cut, S4 that detects the failure sends a protection message to all stations in the ring Based on this message, station S2 updates its topology database and steers protected S6-destined traffic via the ringlet1 In flight frames, destined to stations beyond the point of failure, are dropped at the edge Steer protection has the advantage that the traffic is routed through the optimal path even after a failure
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Ring failure between S3 and S4
Steer protection
12
Wrap In addition to steering, RPR stations may support wrapping Wrapping stations direct traffic onto ringlet0 or ringlet1 on a per destination basis, regardless of failed spans An edge station wraps eligible frames that would otherwise be transmitted across the edge As illustrated in Figure 1211, station S2 normally sends to station S6 via the ringlet0 After the fiber cut, station S2 still sends the traffic via the ringlet0 path Station S6 does not strip frames from the opposite ringlet of that indicated in the wrapped frame (ringlet1 in this case) to avoid frame mis-ordering during the protection event In flight frames, destined to stations beyond the point of failure, are wrapped at the edge Wrap protection is usually faster that steer protection, because the protection decision (wrap traffic) is local to the stations detecting the failure (S3 and S4 in Figure 1211) Another advantage of wrapping is that there is no need to duplicate multicast frames, since all stations remain reachable trough both ringlets Steer and wrap stations can not coexist in a ring, if a mismatch is detected an alarm condition is declared On the other hand, by using a special bit in the RPR header, a ring that is configured for wrap protection can allow the client to steer specific packet flows using the Selective Wrap Independent Steer (SWIS) method SWIS The RPR frame includes a wrap eligibility (we) bit During a span failure, wrapping stations wrap frames only if we is set, if we is clear frames are discarded at the edge of the failure In a wrapping ring, a client may specifically request that a frame be sent by the MAC with the we clear, and by manipulating the parameters provided by the client to the MAC for each transmit frame, the client can steer these frames during a failure condition SWIS allows the client to tailor the protection method to the service preferences: services that require minimum packet loss can be wrapped while services that require minimum delay can be steered
No edge in ring
Ring failure between S3 and S4
Figure 1211 Wrap protection
Resilient Packet Ring (RPR)
Protection Hierarchy
The MAC supports the protection hierarchy listed in Table 122 The protection conditions and the resulting topologies are described in Figure 1212 As described in Figure 1212, only FS and SF conditions can coexist and severe the ring in more than one span Tie condition of non fatal span failures (eg, SD, MS) is ignored and no protection operation is performed The topology and protection (TP) frames are used to detect that the ringlet0 transmit signal of one station as been wrongly connected to the ringlet1 receive of its neighboring, and vice versa This defect is known as a miscabling defect A station declares a miscabling defect if the TP frame from its neighbor indicates that it has been transmitted in a ringlet different from the one it was received As already mentioned in the fairness clause, the fairness frames are transmitted regularly at short intervals These frames are used as a keep alive signal to verify the operation of the RPR layer An SF is declared upon the detection of a major physical layer outage (eg, signal loss, loss of frame), if fairness frames are not detected within a period of time (loss of keep alive), or a miscabling defect has been declared A SD is declared upon the detection of degradation in the signal received by the physical layer (eg, low bit error ratio in SONET), some physical layers may not be able to generate the SD indication
Passthrough Mode The optional passthrough mode enables stations to enter or exit the ring without disconnection of fibers (eg, upon detection of internal failure conditions), and without triggering a signal fail event Passthrough allows a station to leave the ring while maintaining a closed-ring topology, avoiding a protection switch in the case that the transit path of the station is operating normally, but another part of the station failed Periodic transmission of TP frames allows detection of a station entering passthrough When another station appears to have changed its location, TP frame transmission is triggered to facilitate fast rediscovery of the topology and restoration of strict mode traffic Lower Layer Protection A configurable holdoff timeout can suppress spurious responses to expected span status glitches, by extending the time between detection and reporting
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