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The use of summarization to reduce the size of the routing table helps localize topology changes, a benefit that promotes network stability. Network stability occurs because a reduced routing table size means reduced bandwidth use. It also reduces memory use and the number of CPU cycles that are required to calculate the best path selection. 1 Copyright © 2004, Cisco Systems, Inc. Scalable Network Addressing • Each of the 50 divisions has 200 /24 subnets. 0 /16 on its core routers. • The routing table for any router has 200 /24 subnets plus 49 /16 summarized routers for a total of 249 entries in the IP routing table.

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. There are other examples of this negative impact as well. 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.

67 has the first three octets in common with all four entries in the routing table, but it is not clear by looking at the decimal representation which of those entries is the best match to route this packet. A router handles all packets in binary, not dotted decimal, notation. 67 and the binary representation of the last octet for the four entries in the IP routing table. 1, the object is to find the routing table entry that matches the first four bits of the number 67. It is not important whether the last four bits match, so the target is 0100xxxx.

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