January 2002
Beginner
238 pages
6h 20m
English
Content preview from IP Routing
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Route Summarization
IGRP summarizes network numbers when crossing a major network-number boundary, just like RIP does. Route summarization reduces the number of routes that need to be exchanged, processed, and stored.
However, route summarization does not work well in discontiguous
networks. Consider the discontiguous network in Figure 3-5. Router X will receive
advertisements for 10.0.0.0 from both routers
A and B. If
X sent packets with the destination
10.1.1.1 to B, the packet
would be lost -- B would have to drop the
packet because it would not have a route for
10.1.1.1 in its table. Likewise, if
X sent packets with the destination
10.2.1.1 to A, the packet
would be lost -- A would have to drop the
packet because it would not have a route for
10.2.1.1.
Figure 3-5. Contiguous and discontiguous networks
Both IGRP and RIP networks must be designed in contiguous blocks of major network numbers.
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