Enhanced IGRP is enabled in Cisco IOS software using the router eigrp [ASN] global configuration command. The [ASN] keyword designates the EIGRP autonomous system number (ASN). This is a 32-bit integer between 1 and 65535. In addition to other factors, which will be described later in this lesson, routers running EIGRP must reside within the same autonomous system to form a neighbour relationship successfully. Following the configuration of the router eigrp [ASN] global configuration command, the router transitions to EIGRP Router Configuration mode wherein you can configure parameters pertaining to EIGRP. The configured ASN can be verified in the . . .
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