mardi 20 décembre 2011

Compare and contrast routing distance vector and link-state routing

All distance vector protocols are made aware of the roads and sending those routes to directly connected neighbors. However, the link-state routers advertise the states of their links to all other routers in the area so that each router can build a database of complete link-state. These ads are called updates link-state routing (LSA). Unlike distance vector routers, the link-state routers can form special relationships with their neighbors and other routers link-state. This ensures that the information of LSA is exchanged appropriately and effectively.


The initial release of the LSA provides routers with the information they need to build a database of link state. The routing updates occur only when changes in the network.Without change, the routing updates occur after a specific interval. If a change occurs on the network, a partial update is sent immediately. The latter contains only information about the links that have changed, and not a complete routing table. Any director concerned about the use of WAN links contained in these partial updates and sporadic an effective alternative to distance vector routing, which sends a complete routing table every thirty seconds. When a change occurs, the link-state routers are simultaneously notified by the partial update. The distance vector routers waiting their neighbors take note of the change, implement change, and then pass it in turn to their neighbors.The link-state protocols provide faster convergence and better use of bandwidth. They support the CIDR (classless interdomain routing) and VLSM (variable-length subnet mask). They are well suited for complex and evolving networks. In fact, the link-state protocols generally provide superior performance to those of distance vector protocols, and this regardless of the size of the network. The link-state protocols are not implemented on all networks, because they require more memory and processing power than distance vector protocols and can exceed the capacity of equipment slow. Their relative complexity is also an obstacle to their widespread adoption. Only adequately trained administrators can configure and manage them properly

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