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A key consideration in carrier networks is protection and restoration Rapid restoration on an Ethernet switches could be done using an additional layer, MPLS This adds complexity and increases OpEx for any carrier adopting MPLS for protection in the metro network The approach requires manual configuration of the MPLS protection paths These functions are automated at Layer 2 in the RPR protocol Sub 50 ms restoration and the substantial elimination of jitter, delay, and packet loss are the result of the signaling protocol that is native to the RPR MAC The standard defines two protection mechanisms: Steer (mandatory), and Wrap (optional) It is important to have both mechanisms available since they have different uses They are designed to overcome fundamental issues that arise during a protection event Packets are either mis-ordered, lost, or delayed Each of these events has an impact on services Table 123 shows how steering or wrapping affect applications In addition, unlike SONET/SDH restoration mechanisms, RPR restoration mechanisms have the ability to partially restore a service As an example, if a customer is
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TABLE 123 Wrap and Steer Restoration Characteristics Application Speed Packet loss Delay Bandwidth ef ciency (for BE) Reordering (after recovery) Support multicast traf c Implementation Steer Slower (signaling) Higher Lower Higher Lower Complex Client Wrap Faster (local) Lower Higher Lower Higher Simple MAC
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receiving a 20 Mbps Ethernet service and desires protection in the event of an outage there are three options available These are: (a) restore the entire 20 mbps service, (b) do not restore any service and (c) partially restore the service ie, default to some number of mbps lower than 20 mbps during the protection event
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Another important aspect of 80217 for video and voice services is the ability of the RPR MAC to signal to every other node on the ring the state of its links and the available bandwidth on all network segments As noted above transit queues allow traffic to pass right through a node without queuing or inspection beyond the RPR header This ensures that there is no delay or delay variation for this high priority traffic Since the 80217 MAC can automatically control these variables it is ideally suited to carry video and voice; both of which are subject to interference from latency and jitter
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Fairness algorithms are also 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 ring capacity and get high throughput in these instances Secondly, it ensures that no service is ever starved of bandwidth Network managers can always reserve some portion of the ring for Best Effort traffic These two facts mean that network owners with RPR transport equipment can overbook their networks to a much greater extend and enjoy much greater revenue as a result The 8023 Ethernet MAC has no comparable mechanisms There is no signaling among devices to understand the congestion state of other switches on the network This lack of visibility often leads to unexpected congestion and makes IPTV and other services delivery potentially unpredictable
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One of the first things to consider when evaluating requirements for RPR is the application RPR transport equipment delivers strict QoS and guaranteed availability However, there are applications, like residential internet access where these qualities are less important Standard Ethernet switching or routing solutions are appropriate solutions when the QoS and restoration requirements are less strict With applications
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like file transfer or internet access the key strengths of the RPR protocol are not utilized When a pure data application is not sensitive to delay and delay variation and when restoration times that can be as high as 30 seconds do not affect application performance, then RPR is not required
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