Chapter4.ppt - Chapter 4 outline 4.1 Overview of Network...

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4.1 Overview of Network layer data plane control plane 4.2 What’ s inside a router 4.3 IP: Internet Protocol datagram format fragmentation IPv4 addressing network address translation IPv6 4.4 Generalized Forward and SDN match action OpenFlow examples of match-plus-action in action Chapter 4: outline 4-1 Network Layer: Data Plane
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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 4-2 Network Layer: Data Plane
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Network layer transport segment from sending to receiving host on sending side encapsulates segments into datagrams on receiving side, delivers segments to transport layer network layer protocols in every host, router router examines header fields in all IP datagrams passing through it application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical 4-3 Network Layer: Data Plane
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Two key network-layer functions network-layer functions: forwarding: move packets from router’ s input to appropriate router output routing: determine route taken by packets from source to destination routing algorithms analogy: taking a trip forwarding : process of getting through single interchange routing: process of planning trip from source to destination 4-4 Network Layer: Data Plane
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Network layer: data plane, control plane Data plane local, per-router function determines how datagram arriving on router input port is forwarded to router output port forwarding function Control plane network-wide logic determines how datagram is routed among routers along end-end path from source host to destination host two control-plane approaches: traditional routing algorithms: implemented in routers software-defined networking (SDN) : implemented in (remote) servers 1 2 3 0111 values in arriving packet header 4-5 Network Layer: Data Plane
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Per-router control plane Routing Algorithm Individual routing algorithm components in each and every router interact in the control plane data plane control plane 5-6 Network Layer: Control Plane 1 2 0111 values in arriving packet header 3
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data plane control plane Logically centralized control plane A distinct (typically remote) controller interacts with local control agents (CAs) Remote Controller CA CA CA CA CA 5-7 Network Layer: Control Plane 1 2 0111 3 values in arriving packet header
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Network service model Q: What service model for “ channel” transporting datagrams from sender to receiver?
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