To locate documentation of other commands that appear in this chapter, use the command reference master index or search online. Cisco's IGRP Implementation IGRP uses a combination of user-configurable metrics, including internetwork delay, bandwidth, reliability, and load.
Interior routes are routes between subnets in the network attached to a router interface.
If the network attached to a router is not subnetted, IGRP does not advertise interior routes. System routes are routes to networks within an autono mous system. The Cisco IOS software derives system routes from directly connected network interfaces and system route information provided by other IGRP-speaking routers or access servers. System routes do not include subnet information. Exterior routes are routes to networks outside the autonomous system that are considered when identifying a gateway of last resort .