IEEE Std 802.17 Resilient Packet Ring (RPR) EEE 802 Version 1.0 IEEE 802 March 2011 workshop Page 1 IEEE Std 802.17 Resilient Packet Ring Overview RPR Station Dual counter-rotating ringlets Concurrent transmission Bandwidth reuse Three traffic classes Real Time, GIR Low Delay/Jitter, CIR+EIR Best Effort Fairness Reuse of unused bandwidth Weighted allocation to EIR, best effort RPR Station Normal operation RPR Station Plug-and-play Automatic topology discovery Robustness Sub 50 ms fault detection & restoration Fault tolerant No single point of failure Version 1.0 IEEE 802 March 2011 workshop RPR Station EEE 802 Page 2 IEEE Std 802.17 Phys RS PHY RPR Station MAC PHY RS MAC MAC Datapath RPR Station East PHY Transmitting on ringlet0 Receiving on ringlet1 IEEE 802 March 2011 workshop MAC Datapath MAC – Medium access controller PHY – Physical layer entity RS – Reconciliation sublayer PHY RS MAC Key: Version 1.0 PHY RS RS PHY RPR Station RS PHY Receiving on ringlet0 Transmitting on ringlet1 PHY RS RPR Station MAC Datapath West PHY ringlet0 ringlet 1 MAC PHY Must be same speed on all links Media can be different MAC Datapath Agnostic to which PHY used RS defined for SONET/SDH and 1 and 10 Gbps Ethernet PHYs RS PHY PHY Independence West PHY East PHY EEE 802 Page 3 Real SLAs • BW allocations restored upon demand – Class based prioritization allows restoration within delay and jitter requirements for SLAs – Allows full utilization and hard SLAs without reserving BW • FR/ATM-derived classes of service Name Class of service Example use Subclass classA real time classB near real time subclassA0 subclassA1 classB-CIR classB-EIR Guaranteed bandwidth yes yes no Quality of service Delay/jitter Bandwidth type low allocated bounded unbounded classC best effort Version 1.0 Bandwidth subtype reserved reclaimable allocated opportunistic EEE 802 IEEE 802 March 2011 workshop Page 4 Fairness S1 6 Mb/s S2 S3 6 Mb/s 6 Mb/s S1 6 Mb/s S2 S3 6 Mb/s 6 Mb/s w w w 0 Mb/s 10 Mb/s available capacity equal weighted shapers 3.3 Mb/s 4 Mb/s S1 6 Mb/s 6w S2 S3 6 Mb/s 6 Mb/s 2w 2w unequal weighted shapers 2 Mb/s 2 Mb/s 3.3 Mb/s 6 Mb/s Unfairness 3.3 Mb/s Equal Fairness 6 Mb/s Weighted Fairness EEE 802 Version 1.0 IEEE 802 March 2011 workshop Page 5 IEEE Std 802.17 protection mechanisms Normal operation RPR Station Normal operation RPR Station RPR Station RPR Station - Sub 50ms fault restoration - Two paths available between any two nodes Version 1.0 IEEE 802 March 2011 workshop EEE 802 Page 6 IEEE Std 802.17 protection mechanisms Steering RPR Station RPR Station Failure Steering x RPR Station Directs frame on opposing ringlet that still has connectivity RPR Station EEE 802 Version 1.0 IEEE 802 March 2011 workshop Page 7 IEEE Std 802.17 protection mechanisms Wrapping (optional) RPR Station RPR Station Failure Wrapping RPR Station x Transmits frame on opposing ringlet in order to route around the fault Version 1.0 RPR Station EEE 802 IEEE 802 March 2011 workshop Page 8 IEEE Std 802.17 Frame formats 1 baseControl 1 baseControl 6 da 6 da 6 sa 6 sa 1 ttlBase 1 ttlBase 1 extendedControl 1 extendedControl 2 hec 2 hec 2 protcolType 6 daExtended n serviceDataUnit 6 saExtended 2 protcolType n serviceDataUnit 4 fcs 4 fcs Key: da – Destination address sa – Source address Version 1.0 ttl – Time to live fcs – Frame check sequence Size (Octets) IEEE 802 March 2011 workshop payload ttl trailer 1 header ttl trailer payload Size (Octets) 1 header Extended frame format Basic frame format EEE 802 Page 9 IEEE Std 802.17 Datapath sublayer MAC service interface Fairness algorithm, OAM, Protection, Topology Control MAC control sublayer Ringlet selection Type check Transmit frames yield to transit frames MAC Address match – Receive, strip Multicast – Copy, transit Expired TTL - strip Else - Transit MAC datapath sublayer Transit buffer Single queue or Dual queue Transmit frames Receive frames Control packets – OAM, Topology, protection Spatial reuse – Ingress frames use timeslots previously used by egress frames Frame Header Checker Frame Header Ringlet0 datapath Checker Ringlet1 datapath PHY service interface Version 1.0 IEEE 802 March 2011 workshop EEE 802 Page 10 IEEE 802.17 Standards • IEEE 802.17-2004TM Resilient packet ring (RPR) access method and physical layer specifications – IEEE 802.17a-2004: Bridging of IEEE Std 802.17 – IEEE 802.17b-2007: Spatially Aware Sublayer – IEEE 802.17c-2010: Protected Inter-Ring Connection All available through Get IEEE 802 http://standards.ieee.org/getieee802/802.17.html EEE 802 Version 1.0 IEEE 802 March 2011 workshop Page 11
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