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Extra info for Building Scalable Cisco Internetworks BSCI Student Guide v2.1

Example text

Unsummarized Internetwork Topology Changes A routing table with 10,000 entries constantly changes. To illustrate this constant change, consider a network that has more than 5000 routers, with at least one at 5000 different sites. Something changes somewhere in the network every day, for example, a power outage occurs at site A; a backhoe digs a trench at site B; a newly hired system administrator begins work at site C; a Cisco IOS software upgrade is in progress at site D; and a newly added router is being installed at site E.

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.

Advanced IP Addressing 1-5 Functional Structured Design Corporate networks may be organized by product divisions. Network architecture can follow corporate organizational charts. © 2004 Cisco Systems, Inc. All rights reserved. 1 1-5 Some corporations have independent divisions that are responsible for their own operations, including networking. These divisions interact with one another and share resources; however, each division has an independent chain of command. This type of corporate structure is reflected in a functional network design.

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