Why an Active Networks?
As described in the what is an Active Networks, we can understand the difference between Passive and Active Networks, Traditional network layer nodes in any computer network perform services like congestion control, packet switching and routing. Active Networks constitute a new approach to network architecture in which the routing nodes of a network perform computations on the packets that flow through them.
Here is we are describing why we need an Active Networks,
The main motivation for active networking is the need for new network services. While it is possible for these services to be implemented as overlays over existing end systems, they can be implemented more efficiently if they can be implemented over the intermediate nodes of the network at the network layer. Some examples to support this viewpoint are listed below.
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Multimedia : In order to provide multimedia applications such as videoconferencing and telephony, we need to ensure enough bandwidth for time dependent data arrival as well as provision for multicast. RSVP cannot be implemented above the network layer and in the case of multicast, heavy overheads in terms of bandwidth are incurred if an overlay network is used and it does not match the underlying topology. |
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Mobile Computing : Mobile IP is used to see to that a laptop that is wired can be used at different locations without reconfiguring address information.[7] |
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