Routing Send IP packets across the network Forwarding decisions are based on destination IP address Each router only knows the next step The packet asks for directions every hop along the way The list of directions is held in a routing table Routing Different topologies use different data link protocols Ethernet, HDLC, etc. Each router rewrites the frame to add its own data-link header The IP packet remains intact Static routing Administratively define the routes - You're in control Advantages Easy to configure and manage on smaller networks No overhead from routing protocols (CPU, memory, bandwidth) Easy to configure on sub networks (only one way out) More secure - no routing protocols to analyze Disadvantages Difficult to administer on larger networks No automatic method to prevent routing loops If there's a network change, you have to manually update the routes No automatic rerouting if an outage occurs Dynamic routing Routers send routes to other routers Routing tables are ...
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