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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Operation of EIGRP[1]

[1] A major software revision of EIGRP was released in IOS 10.3(11), 11.0(8), and 11.1(3). The performance and stability improvements of the later version make it highly preferable over the older version.

EIGRP uses the same formula as IGRP uses to calculate its composite metric. However, EIGRP scales the metric components by 256 to achieve a finer metric granularity. So if the minimum configured bandwidth on the path to a destination is 512K and the total configured delay is 46000 microseconds, IGRP would calculate a composite metric of 24131. (See Chapter 6, “Interior Gateway Routing Protocol (IGRP),” for a detailed discussion of IGRP metric calculations.) EIGRP, however, will multiply the bandwidth and delay components ...

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