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.

• 内部路由是连接在路由器介面的网路的子网路间的路由。假如连接在路由器的网路未切割子网路，IGRP不会发出内部路由通告。