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Host `A` uses a different flat address on each of its links
What are the advantages and drawbacks of flat addresses versus hierarchical addresses ?
Let us now consider the transient problems that mainly happen when the network topology changes. For this, consider the network topology shown in the figure below and assume that all routers use a distance vector protocol that uses split horizon.
If you compute the routing tables of all routers in this network, you would obtain a table such as the table below :
Destination
Routes on A
Routes on B
Routes on C
Routes on D
Routes on E
A
0
1 via A
2 via B
3 via C
4 via D
B
1 via B
2 via C
3 via D
C
1 via C
2 via D
D
3 via B
1 via D
E
4 via B
1 via E
Distance vector protocols can operate in two different modes : `periodic updates` and `triggered updates`. `Periodic updates` is the default mode for a distance vector protocol. For example, each router could advertise its distance vector every thirty seconds. With the `triggered updates` a router sends its distance vector when its routing table changes (and periodically when there are no changes).
Consider a distance vector protocol using split horizon and `periodic updates`. Assume that the link `B-C` fails. `B` and `C` update their local routing table but they will only advertise it at the end of their period. Select one ordering for the `periodic updates` and every time a router sends its distance vector, indicate the vector sent to each neighbor and update the table above. How many periods are required to allow the network to converge to a stable state ?

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Source string location
../../exercises/network.rst:372
String age
5 years ago
Source string age
5 years ago
Translation file
locale/pot/exercises/network.pot, string 52