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OSPF Route Determination Using SPF Trees
(Page 4 of 4)
Shortest Path Tree and Route Calculation Results
In this simple example, we only need
three levels to construct the tree for RC (we would need more
for RA or RD, however.) The final results would be the
tree in Figure 183,
and the routing information for RC to the four networks that
is shown in Table 125.
Figure 183: OSPF Calculated Shortest Path First Tree This is a graphical representation of the SPF tree calculated in Figure 182, showing only the final results of the calculation process.
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Table 125: Example Calculated OSPF Routes
Destination
Network
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Cost
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Next Hop
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N1
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5
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RA
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N2
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3
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(local)
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N3
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6
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(local)
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N4
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10
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RD
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This of course is what
you would expect in this very simple example. Note that there are no
specific entries for other routers, since they are the means to
the end of reaching networks. However, if one of the other routers
were a boundary router that connected the AS to the outside world, there
would be entries for the networks to which the boundary router connected,
so RC knew to send traffic for those networks to that boundary
router.
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Version 3.0 - Version Date: September 20, 2005
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