Question: In distance-vector routing, good news (decrease in a link metric) will propagate fast. In other words, if a link distance decreases, all nodes quickly learn

In distance-vector routing, good news (decrease in a link metric) will propagate fast. In other words, if a link distance decreases, all nodes quickly learn about it and update their vectors. In Figure 20.33, we assume that a four-node internet is stable, but suddenly the distance between nodes A and D, which is currently 6, is decreased to 1 (probably due to some improvement in the link quality). Show how this good news is propagated, and find the new distance vector for each node after stabilization.

Figure 20.33

Й ПА A D A 6 D B 5 D C 4 D А [З В A 5 B B 2 C B 3A B0B C 2 C 5 B D 6 A D 4 C D 5 B 5 Cost | Next hop B D 3

A D A 6 D B 5 D C 4 D [ A 5 B B 2 C B 3A B0B C 2 C 5 B D 6 A D 4 C D 5 B 5 Cost | Next hop B D 3

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