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Chapter 4a - Distance Vector Routing CCNA Exploration...

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1 7 Oct 2009 Distance Vector Routing CCNA Exploration Semester 2 Chapter 4
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2 7 Oct 2009 Topics Characteristics of distance vector routing protocols Distance vector routing protocols in use today How they discover routes How they maintain routing tables Routing loops
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3 7 Oct 2009 RIP v1 RIP v2 IGRP EIGRP Routing protocols Interior Exterior Distance vector Link state OSPF IS-IS EGP BGP
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4 7 Oct 2009 Distance vector knowledge A distance vector protocol learns: The distance to a network, measured in hops or in some other way The direction of the network: which port should be used to reach it It puts the routes in the routing table It does not know any more details of the route or the other routers along the way
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5 7 Oct 2009 Distance vector Network 192.168.48.0 is 3 hops away using port fa0/0 Network 192.168.22.0 is 2 hops away using port fa0/1
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6 7 Oct 2009 Link state knowledge A link state routing protocol finds out about all the routers in the system and the networks they link to. It builds up a complete picture of the topology It can then work out the best path to any network It puts these best paths in the routing table
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7 7 Oct 2009 Link state I know all the routers and paths in this system of networks.
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8 7 Oct 2009 Metrics RIP v1 and 2 hop count, maximum 15 IGRP and EIGRP bandwidth, delay, load, reliability
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9 7 Oct 2009 Distance vector Exchange complete routing tables with immediate neighbours Do this at regular intervals Adjust the metric, e.g. add 1 to the hop count, or add number based on bandwidth and delay of link.
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10 7 Oct 2009 Adjust the metric 192.168.13.0 is 2 hops away 192.168.13.0 is 3 hops away Send update
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11 7 Oct 2009 Sending updates RIP v1 Whole routing table Broadcast every 30 sec RIP v2 Whole routing table Multicast every 30 sec IGRP Whole routing table Broadcast every 90 sec EIGRP Initial learning process then small updates when topology changes
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12 7 Oct 2009 RIP v1 RIP v2 IGRP Routing protocols Distance vector Link state OSPF IS-IS EIGRP Slow to converge Easy to configure Small networks Little use of resources Fast to converge Harder to configure Large networks Much use of resources
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13 7 Oct 2009 Distance vector updates Routers start up.
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