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Incubus will, of course, see that Mudvayne's update does not meet his FC (3,100 > 2,100), and drops the route At this point, convergence has occurred Note that throughout this entire convergence, no diffusing computations were performed; in fact, there was only a single input event type At this point, if nothing ever changed (no routes go down, no routers fail, and no costs change), no further updates will be sent! The routers would simply continue to send hellos at regular intervals, and the network would remain converged Also, realize that in real life, this entire process would most likely take place in under a second! The following are the two most powerful benefits of EIGRP: ultra-rapid convergence and minimal overhead However, eventually, something in the network is going to change,
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and EIGRP has to be able to respond to the change rapidly and efficiently, find an alternate path, and prevent routing loops-all at the same time To see how EIGRP accomplishes all of this, suppose the connection from Miles to Bela fails As soon as Miles detects the failure, he begins the search for a new route, following the logic outlined in Figure 25-24 (the topology tables are shown in Table 25-6)
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Figure 25-24: Miles searching for a new route by sending queries to his neighbors Basically, after removing the route through the failed connection, Miles looks for another successor candidate in his topology table Finding none, Miles begins the process of switching the route to an active state and beginning a diffusing computation by sending a query to his remaining neighbors Note that Miles also changed the FD for the route to infinite Because he removed his only successor for the route, his best metric for the route changes to infinite, which changes his FD to infinite as well This change occurs before Miles begins the diffusing computation (right after Miles removes the route through the failed network) See Figure 25-25
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Figure 25-25: Miles' computation for Figure 25-24 Note Because, Miles cannot advertise a different metric for the route than the metric he was using when he began the diffusing computation (until the route transitions back to a passive state), if Miles were to receive a query about this network while he was still in an active state, he would advertise an infinite metric In this example, Miles did not receive a query while in an active state, but it is still an important point At Primus and Incubus, the query is received and processed (see Figure 25-26 for the computations for both)
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Figure 25-26: Primus' and Incubus' computation for Figure 25-24 Table 25-6: Topology Tables for Figure 25-24 Router Neighbor Local Cost Advertised Cost S/FS Mudvayne Incubus Primus Miles Bela Incubus Primus Bela 3,100 2,100 1,100 2,100 1,100 100 100 S S S S
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Because Miles is not the successor for either of these routers, they will not need to perform any major reconfigurations They simply remove Miles from the list of feasible successors (because, by design, if they get a query from Miles, it means that Miles can no longer reach the destination network) This logic is shown in Figure 25-27 (the logic is identical for Primus and Incubus) Then they reply with their metrics to the remote network This reply is shown in Figure 25-28, and the topology tables for the network at this point are shown in Table 25-7
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Figure 25-27: Primus' and Incubus' computation for Figure 25-27
Figure 25-28: Incubus and Primus reply to Miles' query Miles initially enters both Primus and Incubus as potential successors for the route, but then Miles examines the topology table to determine the best successor Primus is picked as the best successor because the local metric at Miles for the path through Primus is 2,100, while the local metric at Miles for the path through Incubus is 4,100 Because Primus is the successor, the FD is set to 2,100 Consequently, the route through Incubus is removed from the table entirely because Incubus' advertised metric does not meet the FC (The advertised metric for the path through Incubus is 2,100, which is not less than the FD, so Incubus does not meet the FC) The logic for this step is shown in Figure 25-29
Figure 25-29: Miles' computation for Figure 25-27 Once Miles has chosen a successor, he sends out an update about the route (again, following the logic in the chart) to all of his neighbors Primus and Incubus examine the advertised path to see if it meets the FC, realize that it does not, and throw the update away This process is shown in Figure 25-30 (the topology tables are shown in Table 25-8), with the logic for Miles, Incubus, and Primus shown in Figures 25-31 and 25-32 In reality, Miles would have had to perform this process for each route affected by the downed link; but because you are concerned only with the route to the 19216810 network for this example, you would answer "No" to the "Did the link failure remove the successor for any other routes " question
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