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For example, when you are using a routing protocol such as Open Shortest Path First (OSPF), an upgrade or topology change on the internetwork causes a shortest path first (SPF) calculation. The SPF calculations are large, because each router needs to calculate all known pathways to each of the 10,000 networks. Each change that a router receives requires time and CPU resources. 1 Copyright © 2004, Cisco Systems, Inc. Summarized Network Topology Changes In contrast to an unsummarized network, a summarized network responds efficiently to network changes.
The summarized route is announced as long as a portion of the summarized block is reachable from that core router. The more specific routes are suppressed, so that changes from this division are not propagated to other divisions. In this scenario, each router recognizes only 200 /24 networks and not the 10,000 /24 networks in an unsummarized environment. Obviously, the CPU resources, memory, and bandwidth required for the 200 networks is less than for the 10,000 networks. With summarization, each division hides more specific information from the other divisions and passes only the summarized route that represents that overall division.
1 Copyright © 2004, Cisco Systems, Inc. Benefits of Good Network Design This topic describes the benefits of an effective IP addressing plan implemented within a good network design. Benefits of an Optimized IP Addressing Plan and Design Scalability Predictability Flexibility © 2004 Cisco Systems, Inc. All rights reserved. 1 1-10 An effective network design accommodates unexpected growth and quick changes in the corporate environment. The network responds to mergers with other companies, corporate restructuring, and downsizing with minimal impact on the portions of the network that do not change.
Building Scalable Cisco Internetworks BSCI Student Guide v2.1