Go CCIE Go!! - A Cisco Certified Internetwork Expert

Hi
Please see below . Wouldn’t distance 255 configured under EIGRP ignore all updates so then what use are the other two distance commands that follow.

Thanks

In the following example, the router eigrp global configuration command configures EIGRP routing in autonomous system 1. The network command configuration specifies EIGRP routing on networks 192.168.7.0 and 172.16.0.0. The first distance router configuration command sets the default administrative distance to 255, which instructs the router to ignore all routing updates from routers for which an explicit distance has not been set. The second distance command sets the administrative distance to 80 for internal EIGRP routes and to 100 for external EIGRP routes. The third distance command sets the administrative distance to 120 for the router with the address 172.16.1.3.
Router(config)# router eigrp 1 Router(config-router)# network 192.168.7.0 Router(config-router)# network 172.16.0.0 Router(config-router)# distance 255 Router(config-router)# distance eigrp 80 100 Router(config-router)# distance 120 172.16.1.3 0.0.0.0