18b - Router Design - Switching Fabrics

18b - Router Design - Switching Fabrics - Last Lecture...

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Last Lecture: Network Layer 1. Design goals and issues 2. Basic Routing Algorithms & Protocols 3. Addressing, Fragmentation and reassembly 4. Internet Routing Protocols and Inter-networking 5. Router design 1. Short History + Router architectures 2. Switching fabrics 3. Address lookup problem 6. Congestion Control, Quality of Service 7. More on the Internet’s Network Layer SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 1
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This Lecture: Network Layer 1. Design goals and issues 2. Basic Routing Algorithms & Protocols 3. Addressing, Fragmentation and reassembly 4. Internet Routing Protocols and Inter-networking 5. Router design 1. Short History + Router Archiectures 2. Switching fabrics 3. Address lookup problem 6. Congestion Control, Quality of Service 7. More on the Internet’s Network Layer SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 2
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Five Common Switch Fabric Designs Shared Memory Shared Medium Disjoint Paths Crossbar, Knockout Switch Multi-state Interconnection Network SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 3
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Shared Memory Switch SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 4
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SMS: Pros and Cons Pros Functionally an OQ switch, optimal throughput & delay Can reduce total amount of memory needed Broadcast/multicast ready Cons Under “hot-spot” traffic, might be unfair Can fix with separate memory segments per output But then doesn’t save as much memory Need a controller & memory speedup of 2N Single point of failure Commercial routers: Juniper Networks’ E-series/ERX edge router M-series/M20, M40, M160 core routers SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 5
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Shared Medium Switch SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 6
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SMedS: Pros and Cons Pros Functionally an OQ switch, optimal throughput & delay TDM bus technology is well-understood & advanced Broadcast/multicast ready Cons Need speedup of (N+1) for output memory, N for filter Can also be unfair under “hot-spot” traffic, need sophisticated scheduling/balancing algorithm Single point of failure Commercial routers: Cisco 7500 series SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 7
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Disjoint Paths Switch SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 8
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