1 / 12

NGR: Next Generation Router

NGR: Next Generation Router. Initial Design Review Shahzad Ali Xia Chen Brendan Howell Yu Zhong. Specifications. Minimum 64 port OC-48, aggregate capacity of 160Gbps, Fair Queuing. Extra features RED MPLS, QoS Multicast Scalability (higher port density). Overall Design. 16 Cards.

alleyt
Download Presentation

NGR: Next Generation Router

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NGR: Next Generation Router Initial Design Review Shahzad Ali Xia Chen Brendan Howell Yu Zhong

  2. Specifications • Minimum • 64 port OC-48, aggregate capacity of 160Gbps, Fair Queuing. • Extra features • RED • MPLS, QoS • Multicast • Scalability (higher port density) 18-757 Initial Design Review

  3. Overall Design 16 Cards Switch One port on a Line card Transceiver Cell buffer Scheduler + FQ Routing table Framer Network processor 18-757 Initial Design Review

  4. Components • Input Port processing (IPP) • Buffers • Switch Scheduling • Output port processing • Fair Queuing 18-757 Initial Design Review

  5. Input Port Processing • Line termination and data link processing • Break variable length packet into fixed length • Lookup routing information • Process packets at "line speed” i.e. close to 5 million routing lookup per second. • Do simple IP packet processing functions • Decrease TTL, Checksum etc. • MPLS or Hardware Filters 18-757 Initial Design Review

  6. Possible Solutions for IPP • Transceiver for line termination and PHY processing • HFCT-5402D by Agilent (HP) • VSC8140 by Vitesse • Framer for fixed size cells • VSC9112 by Vitesse • Network Processor • IXP1200 by Intel (Level One) • APP1200 and APP1400 by Agere • Generic micro-processor 18-757 Initial Design Review

  7. Where to Queue? • Input port • Does not require high fabric speedup. • OPP can be done at reasonable speeds • Difficult to do output scheduling (FQ) • Output port • Easy to schedule packets on the link (FQ) • Fabric and OPP have to have high speedup. 18-757 Initial Design Review

  8. Buffers • Our initial decision: • Buffer packets on the input port • Handle FQ at the input port (somehow) • Use standard SDRAM for buffers • PC-100 10ns access latency • Dimension buffer by simulation • Buffers for each input port. 18-757 Initial Design Review

  9. Switch Scheduling • We will simulate with various scheduling mechanisms including Multicast schemes. • iSLIP, RR, FCFS, TARTAR (for multicast) • Virtual Output Queues to avoid HOL • Nominal Fabric speedup and priority classes. • Implement both Drop-tail and RED buffer schemes. • Local delivery of packets on the same line card. 18-757 Initial Design Review

  10. Switch Fabric • Shoot for 1024x1024 but backup is 64x64 • Vitesse VSC836 takes too long to configure!! • 13cycles x 40ns = 520ns (1.9M Frames/sec) • Use AMCC S2018 17x17 in a 3-stage CLOS network. • Other options? 18-757 Initial Design Review

  11. Output Port Processing and Scheduling • Basic de-framing and physical level processing. • FQ discipline • WFQ • W2FQ • How do we do this with input buffering? • What level of buffering do we require at the output ports? 18-757 Initial Design Review

  12. Plan of Action • Decide on IPP and Network Processor. • Concentrate on switch fabric choice. • Analyze switch scheduling schemes. • Try to implement FQ with input port buffers. • Implement RED and Drop Tail. • Develop a simulator for the switch. • Experimentally determine the buffer size. 18-757 Initial Design Review

More Related