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Chapter 4 Network Layer: the Data Plane Chapter 4 Network Layer: The Data Plane A note on the use of these Powerpoint slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: Computer . If you use these slides (e.g., in a class) that you mention their source Networking: A Top (after all, we’d like people to use our book!) . If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this Down Approach material. 7th edition Thanks and enjoy! JFK/KWR Jim Kurose, Keith Ross All material copyright 1996-2016 Pearson/Addison Wesley J.F Kurose and K.W. Ross, All Rights Reserved April 2016 Network Layer: Data Plane 4-1 Chapter 4: outline 4.1 Overview of Network 4.4 Generalized Forward layer and SDN • data plane • match • control plane • action 4.2 What’s inside a router • OpenFlow examples 4.3 IP: Internet Protocol of match-plus-action • datagram format in action • fragmentation • IPv4 addressing • network address translation • IPv6 Network Layer: Data Plane 4-2 Chapter 4: network layer chapter goals: . understand principles behind network layer services, focusing on data plane: • network layer service models • forwarding versus routing • how a router works • generalized forwarding . instantiation, implementation in the Internet Network Layer: Data Plane 4-3 Network layer application transport . transport segment from network data link sending to receiving physical network network data link data link network host physical physical data link physical network network . on sending side data link data link encapsulates segments physical physical into datagrams network network data link data link physical physical network . on receiving side, data link physical delivers segments to application network transport transport layer data link network network network physical data link data link data link physical physical . network layer protocols physical in every host, router . router examines header fields in all IP datagrams passing Network Layer: Data Plane 4-4 through it Two key network-layer functions network-layer functions: analogy: taking a trip .forwarding: move . forwarding: process of packets from router’s getting through single input to appropriate interchange router output .routing: determine route . routing: process of taken by packets from planning trip from source to destination source to destination • routing algorithms Network Layer: Data Plane 4-5 Network layer: data plane, control plane Data plane Control plane . local, per-router function . network-wide logic . determines how . determines how datagram is datagram arriving on routed among routers along router input port is end-end path from source forwarded to router host to destination host output port . two control-plane . forwarding function approaches: values in arriving packet header • traditional routing algorithms: implemented 0111 1 in routers 2 3 • software-defined networking (SDN): implemented in (remote) servers Network Layer: Data Plane 4-6 Per-router control plane Individual routing algorithm components in each and every router interact in the control plane Routing Algorithm control plane data plane values in arriving packet header 0111 1 2 3 Network Layer: Control Plane 5-7 Logically centralized control plane A distinct (typically remote) controller interacts with local control agents (CAs) Remote Controller control plane data plane CA CA CA CA CA values in arriving packet header 0111 1 2 3 Network Layer: Control Plane 5-8 Network service model Q: What service model for “channel” transporting datagrams from sender to receiver? example services for example services for a individual flow of datagrams: datagrams: . in-order datagram . guaranteed delivery delivery . guaranteed delivery . guaranteed minimum with less than 40 msec bandwidth to flow delay . restrictions on changes in inter-packet spacing Network Layer: Data Plane 4-9 Network layer service models: Guarantees ? Network Service Congestion Architecture Model Bandwidth Loss Order Timing feedback Internet best effort none no no no no (inferred via loss) ATM CBR constant yes yes yes no rate congestion ATM VBR guaranteed yes yes yes no rate congestion ATM ABR guaranteed no yes no yes minimum ATM UBR none no yes no no Network Layer: Data Plane 4-10 Chapter 4: outline 4.1 Overview of Network 4.4 Generalized Forward layer and SDN • data plane • match • control plane • action 4.2 What’s inside a router • OpenFlow examples 4.3 IP: Internet Protocol of match-plus-action • datagram format in action • fragmentation • IPv4 addressing • network address translation • IPv6 Network Layer: Data Plane 4-11 Router architecture overview . high-level view of generic router architecture: routing, management routing control plane (software) processor operates in millisecond time frame forwarding data plane (hardware) operttes in nanosecond timeframe high-seed switching fabric router input ports router output ports Network Layer: Data Plane 4-12 Input port functions lookup, link forwarding line layer switch termination protocol fabric (receive) queueing physical layer: bit-level reception data link layer: decentralized switching: e.g., Ethernet . using header field values, lookup output see chapter 5 port using forwarding table in input port memory (“match plus action”) . goal: complete input port processing at ‘line speed’ . queuing: if datagrams arrive faster than forwarding rate into switch fabric Network Layer: Data Plane 4-13 Input port functions lookup, link forwarding line layer switch termination protocol fabric (receive) queueing physical layer: bit-level reception decentralized switching: data link layer: . using header field values, lookup output e.g., Ethernet port using forwarding table in input port see chapter 5 memory (“match plus action”) . destination-based forwarding: forward based only on destination IP address (traditional) . generalized forwarding: forward based on any set of header field values Network Layer: Data Plane 4-14 Destination-based forwarding forwarding table Destination Address Range Link Interface 11001000 00010111 00010000 00000000 through 0 11001000 00010111 00010111 11111111 11001000 00010111 00011000 00000000 through 1 11001000 00010111 00011000 11111111 11001000 00010111 00011001 00000000 through 2 11001000 00010111 00011111 11111111 otherwise 3 Q: but what happens if ranges don’t divide up so nicely? Network Layer: Data Plane 4-15 Longest prefix matching longest prefix matching when looking for forwarding table entry for given destination address, use longest address prefix that matches destination address. Destination Address Range Link interface 11001000 00010111 00010*** ********* 0 11001000 00010111 00011000 ********* 1 11001000 00010111 00011*** ********* 2 otherwise 3 examples: DA: 11001000 00010111 00010110 10100001 which interface? DA: 11001000 00010111 00011000 10101010 which interface? Network Layer: Data Plane 4-16 Longest prefix matching . we’ll see why longest prefix matching is used shortly, when we study addressing . longest prefix matching: often performed using ternary content addressable memories (TCAMs) • content addressable: present address to TCAM: retrieve address in one clock cycle, regardless of table size • Cisco Catalyst: can up ~1M routing table entries in TCAM Network Layer: Data Plane 4-17 Switching fabrics . transfer packet from input buffer to appropriate output buffer . switching rate: rate at which packets can be transfer from inputs to outputs • often measured as multiple of input/output line rate • N inputs: switching rate N times line rate desirable . three types of switching fabrics memory memory bus crossbar Network Layer: Data Plane 4-18 Switching via memory first generation routers: . traditional computers with switching under direct control of CPU . packet copied to system’s memory . speed limited by memory bandwidth (2 bus crossings per datagram) input output port memory port (e.g., (e.g., Ethernet) Ethernet) system bus Network Layer: Data Plane 4-19 Switching via a bus . datagram from input port memory to output port memory via a shared bus . bus contention: switching speed limited by bus bandwidth bus . 32 Gbps bus, Cisco 5600: sufficient speed for access and enterprise routers Network Layer: Data Plane 4-20 Switching via interconnection network . overcome bus bandwidth limitations . banyan networks, crossbar, other interconnection nets initially developed to connect processors in multiprocessor . advanced design: fragmenting datagram into fixed length cells, crossbar switch cells through the fabric. Cisco 12000: switches 60 Gbps through the interconnection network Network Layer: Data Plane 4-21 Input port queuing . fabric slower than input ports combined -> queueing may occur at input queues • queueing delay and loss due to input buffer overflow! . Head-of-the-Line (HOL) blocking: queued datagram at front of queue prevents others in queue from moving forward switch switch fabric fabric output port contention: one packet time only one red datagram can be later: green packet transferred. experiences HOL lower red packet is blocked blocking Network Layer: Data Plane 4-22 Output ports This slide in HUGELY important! datagram switch buffer link fabric layer line protocol termination queueing (send) . buffering required Datagramwhen
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