| IGRP advertises three types of routes:
Interior
Interior routes are routes between
subnets of a network attached to a router interface. If the network
attached to a router is not subnetted, IGRP does not advertise interior
routes.
System
System routes are routes to
networks within an autonomous 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
Exterior routes are routes to
networks outside the autonomous system that are considered when
identifying a gateway of last resort. The Cisco IOS software chooses a
gateway of last resort from the list of exterior routes that IGRP
provides. The software uses the gateway (router) of last resort if a better
route is not found and the destination is not a connected network. If
the autonomous system has more than one connection to an external
network, different routers can choose different exterior routers as the
gateway of last resort.
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Interactive Media Activity
Checkbox: IGRP Routes
After completing this activity, the student will be able to understand IGRP
routes.
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Web Links