<?xml version="1.0"?>
<ACTIVITY>
	<TITLE>Activity</TITLE>
	<SUBTITLE>Distance Vector Routing</SUBTITLE>
	<STEPS BASE="1" BYSTEP="false">
		<STEP SRC="activity_3_1_4s1.swf">
			<DESCRIPTION>In a Distance Vector routing protocol routers communicate with their directly connected neighbors.  They send their entire routing table to the neighbors.  When a router receives an update it compares the update to its current routing table. If there is a new route, it adds it to the routing table. If there is a route with a better metric, this new route will replace the old route. Then the router sends the updated routing table to its neighbors.  
The metric value is the value given to the link between adjacent routers. RIP uses hop counts.  IGRP uses a calculation of bandwidth, load, reliability and delay values.  Metric is added at each hop.

Distance vector routing protocols send scheduled updates out all connected interface.
</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s2.swf">
			<DESCRIPTION>RouterA will add its directly connected networks to its routing table. If a Distance Vector routing protocol is enable then it is will send the routing table to its neighbor. The update is sent over all interfaces that are enabled for routing.</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s3.swf">
			<DESCRIPTION>RouterB updates its routing table when it receives the routes from RouterA. The updates are sent through all connected interfaces at the next routing update time interval. Notice that a metric of 10 was added to the 10.10.1.0 network. That is the metric for the link between RouterA and RouterB.</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s4.swf">
			<DESCRIPTION>RouterC updates its routing table when it receives the routes from RouterB. The updates are sent through all connected interfaces at the next routing update time interval. Notice the metric for the network 10.10.1.0 has changed to 30. This metric is the sum of the two links between RouterA and RouterC.</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s5.swf">
			<DESCRIPTION>RouterC updates its routing table when RouterB receives the routes from RouterC. The updates are sent through all connected interfaces at the next routing update time interval.</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s6.swf">
			<DESCRIPTION>RouterA updates its routing table when it receives routes from RouterB. The updates are sent through all connected interfaces at the next routing update time interval.

Now all the routers have learned about the entire network. They have reached convergence.  
</DESCRIPTION>
		</STEP>
		<STEP SRC="activity_3_1_4s7.swf">
			<DESCRIPTION>The source router and the destination network are shown in the following.  Select the total metric and the next hop route to the destination.</DESCRIPTION>
		</STEP>
	</STEPS>
	<MESSAGE>Congratulations, this activity has<BR/>been successfully completed.</MESSAGE>
</ACTIVITY>
