Explain distance vector routing . What are its limitations and how are they overcome?
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Answer Posted / sanjay poudel
It is a dynamic vector routing algorithm.
consists of data structure called routing tables.
it calculates the best route based on the distance.
Distance vector routing updates full routing table.
The utilization of CPU and memory in distance vector routing is lower than the link state routing.
Bellman -Ford algorithm is used for performing distance vector routing.
LIMITATIONS
It is slower to converge than link state.
it creates more traffic than link state since a hop count change must be propogated to all routers and processed on each route.
The bellman-ford algorithm does not prevent routing loops from happening and suffers from the count-to identify problem.
In such such a scenario 3 hop-counts path will be selected although other path is congestion free. This can be overcome by using LSA .
(Link State Analysis) protocols and Hybrid Protocols. In these not only the hop-count is considered but also link quality is checked at regular interval to ensure the selection of not only shortest path but also the most efficient path for the destination
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