Ring Span Bandwidth Management in RPR
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1 RPR Ring Span Bandwidth Management in RPR Pankaj K Jha Cypress Semiconductor [email protected] pkj_bwmgt_01.pdf
2 A High traffic density B Different BW on RPR Spans H G RPR In a mid/large Metro Area, only few Regions may have High BW Needs High concentration of high BW customers in select areas A cost-effective solution would be to only upgrade high density areas Huge savings in Labor & Cost SP more willing to upgrade only required nodes Customers can afford BW increase, as SP can pass Savings pkj_bwmgt_01.pdf C Suburban areas with low traffic density D F E High traffic density
3 SONET/SDH Networks SONET/SDH vs. RPR Networks SONET/SDH networks provide circuit-switched paths inside which packets travel In both UPSR & BLSR configurations, full bandwidth allocated all around the ring. Traditional SONET/SDH Networks require ALL Nodes to be upgraded to a higher speed pkj_bwmgt_01.pdf
4 RPR Networks A Unicast Packet terminates at a Destination Node Both Rings are used for Packet Transport H-A-B and D-E-F High-bandwidth Traffic within their Local Segments. B and H Nodes terminate/strip packets. Other packets sent by B and H at B-C and H-G Link Speeds Different Rates doesn t change Packet Transport Behavior SONET Framing only provides an Envelope for Packet Transport H G A B RPR C pkj_bwmgt_01.pdf D F E
5 Determining RPR Support for Span BW Management RPR MAC Design for supporting different Span Bandwidth Network Topology and L2 Models for Span BW Management MAC configuration Topology Discovery with BW Information Propagation Physical and MAC Layer Architecture PHY Layer MAC sublayer LLC Interface Design Complexity Issues Transparent Operation in case of Homogeneous Networks (all segments of same speed and type) Clear Partitioning of PHY and MAC layers for Heterogeneous Networks Operation with minimal complexity in Line Cards pkj_bwmgt_01.pdf
6 Network Model for Span BW Network Topology and BW Models remain unchanged. Consider a Homogeneous Ring (Same Bandwidth) RPR MAC should allow Nodes to Reserve Bandwidth to support RSVP and other Leased Line type Applications Topology advertises available remaining Bandwidth Node BW Allocation: Say Links H-G, G-F, B-C, and C-D have 7.5G worth BW Allocated, with only 2.5G available Network view: this situation is same as an RPR with Span BW of & Mix H G F A RPR E B C D pkj_bwmgt_01.pdf
7 RPR MAC Model Data Client Control Client MA_data.request MA_control.request MA_data.indication MA_control.indication LLC MAC PHY MAC PHY MAC PHY A Single MAC with multiple Instances A Unified MAC Interface for different Links. Network Interfaces transparent to MAC Clients With this model, it s possible to support multiple Links pkj_bwmgt_01.pdf
8 MAC Model for Different Span BW A MAC Sub-layer provides a unified interface to MAC client Individual (logical) MACs handle Tx/Rx links. BW Difference treated by MAC as a Reserved BW by Node. LLC MAC A Single Logical MAC Entity MAC sublayer MAC sublayer Rx PHY & Framer Tx PHY & Framer Rx PHY & Framer Tx PHY & Framer pkj_bwmgt_01.pdf
9 Homogeneous Networks (same BW on all Spans) Link Bandwidth (Link Bandwidth on either Side): B L Reserved Bandwidth by Node Applications: B N Available Bandwidth: B A = B L - B N Bandwidth advertised to upstream Nodes: B A Heterogeneous Networks (different BW across Spans) BW Advertisement Link Bandwidth (Link Bandwidth on the other Side): B L Everything else same as before: B A = B L - B N link downstream link downstream RPR Node pkj_bwmgt_01.pdf
10 RPR MAC Model A MAC Sub-layer provides a unified interface to MAC client(s) Individual (logical) MACs handle Tx/Rx links. Lower part of MAC sub-layer manages different MACs. This approach may allow existing Hardware to try out RPR pkj_bwmgt_01.pdf
11 Fault Recovery & Restoration 1 2 A D RPR C 1 B 3 Bandwidth for Fault Recovery & Restoration limited to lowest Link Bandwidth Topology Notification methods advertise Maximum Bandwidth for Fault Recovery/Restoration pkj_bwmgt_01.pdf
12 Conclusion RPR should allow support for different Span Bandwidths No need to have SONET/SDH Network Restrictions Opaque nature of RPR networks (O-E-O) could easily support multiple rate spans Take Advantage of Packet Transport Nature of RPR Networks RPR Networks with different Traffic Patterns in Segments Incremental Upgrade Path for Providers and Subscribers pkj_bwmgt_01.pdf
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