Three ways to quickly learn how EIGRP injects default routes

 1, static heavy spread Static heavy spread is the most complicated method, only need two devices on the router can be ordered. First add the default route on R1, then apply the redistribute command in eigrp. R1(config)#ip route 0.0.0.0 0.0.0.0 s0/0 //Add default route R1(config)#router eigrp 90 R1(config-router)#redistribute static //Static re-distribution

2, the announcement of the default route This method is relatively complex. The announcement of the default route is to announce the default route to the eigrp process like the popular network segment. Since it is the announcement of the default route, there must be a default route. R1(config)#ip route 0.0.0.0 0.0.0.0 s0/0 //Add default route R1(config)#router eigrp 90 R1(config-router)#network 0.0.0.0 // Announcing the default route

3, ip default-network ip default-network 敕 order only supports class IP, so, when applying this method, you should apply the main class collection number corresponding to the network segment. For example, the 12.0.0.0 device script should be applied in this topology: R1(config)#ip default-network 12.0.0.0 //Apply ip default-network Declare the default route R1(config)#router eigrp 90 R1(config-router)# Network 12.0.0.0 //Declare the network segment R1(config-router)#exit R1(config)#ip route 12.0.0.0 255.0.0.0 null 0 The last one is concerned about the demand, when applying this method, the demand guarantee There are corresponding entries in the local routing table. However, our 12 network segment is a 24-bit mask, and ip default-network declares the main class collection number and the 8-bit mask.