m one network to another, the old foreign network withdraws its route as the new foreign network advertises the specific route to the mobile user. Take into consideration how routing information propagates in a distance-vector algorithm or inter-AS routing protocols like BGP. Also think about interdomain routing among networks that span the globe. Are datagrams routed immediately to the n
One approach that might be used in a mobile network architecture that would allow a datagram sent by the correspondent to reach a destination mobile device is to allow mobile users to maintain their IP addresses as they moved among foreign networks. The foreign network would advertise a highly specific route to the mobile user and use the existing routing infrastructure to propagate this information throughout the network. Scalability is a concern in this approach.
Suppose as the mobile user moves from one network to another, the old foreign network withdraws its route as the new foreign network advertises the specific route to the mobile user. Take into consideration how routing information propagates in a distance-
- Are datagrams routed immediately to the new foreign network as soon as the foreign network begins advertising its route?
- Would a situation ever occur where different routers think that different foreign networks contain the mobile user? Explain.
- Describe over what time period other routers in the network will eventually learn the path to the mobile users that have moved to a new foreign network.
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