With split horizon, when a node sends a routing update to its neighbor, it does not send those routes it learned from ea

[answerhappygod]

With Split Horizon When A Node Sends A Routing Update To Its Neighbor It Does Not Send Those Routes It Learned From Ea 1 (63.21 KiB) Viewed 14 times

With split horizon, when a node sends a routing update to its neighbor, it does not send those routes it learned from each neighbor back to that neighbor. In another variation of split horizon, called split horizon with poison reverse, if a node A routes through its neighbor B to get to the destination C, then A will advertise to B that its distance to C is oo. By doing so, B will never attempt to route to C via A, as long as A continues to route to C via B. 2 Figure 10: Network for Problem 5. Now, consider the network in Fig. 10 with 4 nodes a, b, c, and d and the corresponding link costs. Assume that each node initially knows the costs to each of its neighbors. Suppose that split horizon with poison reverse is used in distance-vector routing algorithm. Every minute, at exactly the same time, each router sends its current distance vector to its neighbors. Then it updates its own vector based on what it receives, and sends out the updated vector the next minute. (a) Show all updates of the routing table at each node until the distance vector routing is stabilized. (b) After stabilizing, suppose the cost of the link between a and b changes to 100, and b upgrades this new cost. Write down the distance vector table changes in routers b, c, and d for the next 5 updates. Will the routing information be finally stabilized again? Justify your answer.