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Lecture11 - Routing Operations & Processes

Lecture11 - Routing Operations & Processes -...

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11/30/2009 1 CNIT 24000 CNIT 24000 – Data Communications & Networks Routing Operations & Processes Objectives Use the foundation we’ve laid previously to extend our knowledge of network operations Identify the key components of the routing process Differentiate routing protocols based on operations, efficiency, scalability, etc. Identify the many roles a router can perform
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11/30/2009 2 Router Functionality Network device that operates primarily at OSI layers 1 through 3 Able to function at all 7 layers if necessary Identifies paths through the network(s) based on Layer 3 addresses 3 Physical Components of Routers A highly specialized computer consisting of: Central Processing Unit (CPU) Random Access Memory (RAM) NVRAM (startup-config) Flash (IOS Image) “Memory” (running-config, routing table, etc) Basic Input/Output System (BIOS) Operating System Cisco – IOS Juniper – JunOS Force10 – FTOS AdTran – ADTRAN OS Motherboard Input/Output (I/O) ports Power supply Enclosure – Chassis & Cover 4
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11/30/2009 3 Router Function: Physical Connectivity Interfaces - Physical I/O ports Define the physical communication medium, framing (or cell format), and appropriate connection May support sub-interfaces Configuration Port number Transmission technology Bandwidth Protocols supported 5 Router Function: Logical Connectivity Utilizes the Configuration provided by the Physical Connectivity Learn Network Topology via Logical Connectivity Routing Table Correlation of port number (interface) with L3 address that is reachable via that interface Default Route Associates a physical/logical interface with all unknown Layer 3 destinations Used to minimize routing tables 6
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11/30/2009 4 The Routing Processing Gateway is accessed by clients via transmitted frames
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