code 128 barcode font for excel 2010 Figure 25-30: Incubus and Primus process Miles' update in Objective-C

Generator PDF 417 in Objective-C Figure 25-30: Incubus and Primus process Miles' update

Figure 25-30: Incubus and Primus process Miles' update
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Figure 25-31: Miles' computation for Figure 25-30
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Figure 25-32: Incubus' and Primus' computation for Figure 25-30 One important point to note about this entire process is that Mudvayne was completely unaffected by this change (In fact, Mudvayne doesn't even know a change occurred) The ability to only affect a subset of the routers in a topology is another of EIGRP's major benefits: only those routers that need to know about a change will be affected by that change Table 25-7: Topology Tables for Figure 25-28 Neighbor Local Cost Advertised Cost Incubus Primus Bela Primus Direct connection 3,100 2,100 1,100 2,100 100 2,100 1,100 100 1,100 100
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Router Mudvayne Incubus Primus Miles Bela
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S/FS S S S S S
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FD 3,100 2,100 1,100 2,100 100
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Now, to switch gears a bit, let's assume that while the link between Miles and Bela is down, you increase the cost of the link between Primus and Bela to 2,000 The first step and the
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resulting changes are detailed in Figures 25-33 through 25-36, and the topology tables for Figure 25-33 are shown in Table 25-9
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Figure 25-33: The first step in a large-scale diffusing calculation
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Figure 25-34: Primus' computation for Figure 25-33
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Figure 25-35: Bela's computation for Figure 25-33
Figure 25-36: Miles' and Incubus' computation for Figure 25-33 Table 25-8: Topology Tables for Figure 25-30 Router Neighbor Local Cost Advertised Cost Mudvayne Incubus Primus Miles Bela Incubus Primus Bela Primus Direct connection 3,100 2,100 1,100 2,100 100 2,100 1,100 100 1,100 100
S/FS S S S S S
FD 3,100 2,100 1,100 2,100 100
Notice that a little change in the cost of a link caused a wide variety of events to happen First, Primus removes and re-adds the route to the network that connects him to Bela Thus, Primus also removes Bela from the topology table, which means Primus Table 25-9: Topology Tables for Figure 25-33 Neighbor Local Cost Advertised Cost S/FS Incubus 3,100 2,100 S -
Router Mudvayne Incubus Primus Miles
FD 3,100 4,294,967,295 4,294,967,295 4,294,967,295
Router Bela
Table 25-9: Topology Tables for Figure 25-33 Neighbor Local Cost Advertised Cost S/FS Direct connection 100 100 S
FD 100
no longer has a route to the 19216810 network (which is bad, because Primus is the only successor for that route for all of the other routers) Because Primus can no longer find a valid route in the topology table for the 19216810 network, Primus enters an active state for that network and queries all neighbors Although the query from Primus doesn't cause any real issues at Bela (he isn't using Primus to get to the 19216810 network anyway), it causes all kinds of interesting things to happen at Miles and Incubus When they hear the query from Primus, they think to themselves, "Oh no, my successor to that network just died!" They look at the logic telling them what to do in such a situation and realize that they need to remove the path through Primus from their tables and find an alternate path This logic flow leads to the events shown in Figure 25-37 (see Table 25-10 for the topology tables)
Figure 25-37: The second step in a large-scale diffusing calculation Because the logic for the diffusing computation (shown for Miles, Incubus, and Mudvayne in Figure 25-38, and shown for Bela and Primus in Figures 25-39 and 25-40) in this situation states, "Send a query to all neighbors except those reached through the same interface as Router Y (in this case, Primus) that includes an infinite metric for the route through Router Z (in this case, Miles or Incubus)," Miles and Incubus will not send a query to Primus for this network during their diffusing computation They do, however, send queries to each other, and Incubus sends a query to Mudvayne as well Of course, these queries aren't going to help them any in this situation Because Incubus and Miles both heard a query from their only successor (meaning they had to remove their only topology entry for the 19216810 network), neither of them have any idea how to get to the 19216810 network And after hearing a query from his successor, Mudvayne removes his only path to the 19216810 network, making him just as clueless as everyone else
Figure 25-38: Miles', Incubus', and Mudvayne's computation for Figure 25-37 Table 25-10: Topology Tables for Figure 25-37 Router Neighbor Local Cost Advertised Cost S/FS FD Mudvayne Incubus Primus Miles Bela 100 S 4,294,967,295 4,294,967,295 4,294,967,295 4,294,967,295 100
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