Static Routing and Distance Vector Routing Protocols - CCIE Routing and Switching Exam Certification Guide - page 357

•

Classless protocol (supports VLSMs).

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Default composite metric of bandwidth and delay.

•

Load and reliability can be factored into the metric.

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Sends partial route updates only when changes occur.

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Support for authentication.

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Uses DUAL for loop prevention.

•

By default, equal-cost load balancing; unequal-cost load balancing with the variance
command.

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Administrative distance is 90 for EIGRP internal routes, 170 for EIGRP external routes,
and 5 for EIGRP summary routes.

Routing Protocols Comparison

Table 7-4

Routing Protocol

RIPv1 RIPv2 IGRP EIGRP

DistanceVector yes yes yes hybrid

VLSM no yes no yes

Authentication no yes no yes

Update Timer 30 30 90 n/a

Invalid Timer 180 180 270 n/a

Flush Timer 240 240 630 n/a

Protocol/port UDP 520 UDP 520 IP 9 IP 88

Admin Distance 120 120 100 90