Download File - Computer Networks & Information Security

Download File - Computer Networks & Information Security Download File - Computer Networks & Information Security

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A B H Route Error (RERR) S E C I RERR [J-D] J sends a route error to S along route J-F-E-S when its attempt to forward the data packet S (with route SEFJD) on J-D fails Nodes hearing RERR update their route cache to remove link J-D G F K J D M Z Y N L 56

Route Caching: Beware! Stale caches can adversely affect performance With passage of time and host mobility, cached routes may become invalid A sender host may try several stale routes (obtained from local cache, or replied from cache by other nodes), before finding a good route An illustration of the adverse impact on TCP will be discussed later in the tutorial [Holland99] 57

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