Static Routing summarized by igp

The static default route of Static Routing in igp summary is to specify a path on a vro. When the vro does not reach the path of the remote network, the path is in the format of ip route 0.0.0.0 0.0.0.0 XXX. XXX. XXX. what is dynamic default route for XXX (or interface)? What is the difference between dynamic default route and static default route? For example, there is a star topology where R1 is the core router, while the remaining R2, R3 ..... For a branch, you want to use the core router to tell the branch router that when the path cannot be found to reach a remote network (as long as it is a remote network unknown to the branch router, no matter what the remote network ), all come to the remote network through the core router, and when a new router is added to this topology, the default route can also appear on this router. What should I do at this time? (Note: As long as all the routers that can dynamically obtain the core router's network can have such a default route, such as the D * Representation of the network in the MongoDB) the solution is to re-release the default route on the core router (note that it is not done on the branch router, different from the static default route). Different dynamic routing protocols have different practices, I have found the article below. 1. In RIP, the default route uses the default-information originate method to inject data to other routers. 2. There are several situations in OSPF: (1) inject the default route into the conventional area and use the default-information originate method. If a default route already exists, the statement does not need to be followed by the always parameter, otherwise, the always parameter is required. Once the command is executed, the vro becomes an ASBR. The default route will exist in five types of LSA in all routers (the route table is O * E2 ). (2) The ending area or the absolute ending area, because the ABR of the ending and absolute ending areas has automatically produced a route summary entry of all 0 (the routing table shows O * IA ), so you don't have to worry about it. (3) In The NSSA region, default routes are not automatically generated for the associated ABR by default. If necessary, use area X nssa default-informatin-originate to generate the routes, A 7-class LSA (routing performance is O * N2) is generated. 4. There are two default routing methods for 8 0 in China: ip route 0.0.0.0 0.0.0.0 next hop ip address, even if network 0.0.0.0 is used to advertise the default route in this way, no direct connection interface of the default route ip route 0.0.0.0 0.0.0.0 is injected to other routers. network 0.0.0.0 is used to advertise the default route in this way, the default route is advertised to other routes. Redistribute static redistribution is used by default. However, you must note that network 0.0.0.0 will cause all networks on the vroeigrp to be declared in the OSPF process. Therefore, we do not recommend using the 2 method to publish the default route. The default-network 0.0.0.0 ip address cannot inject eight 0 default routes to other routers. Instead, you can use the ip default-network to inject non-eight 0 routes into other routers. summary: ip default-network is used for rip, igrp, and ospf. default-information originate is used for rip, ospf, isis, and bgpredistribute static. ① Ip route 0.0.0.0 0.0.0.0 f0/0 Router VPN 100 Redistribute static metric 1544 100 255 1 1500 ② ip route 0.0.0.0 0.0.0.0 s0/0 Router VPN 100 Network 0.0.0.0 ③ ip default-network 192.168.1.0 router VPN 100 Network 192.168.1.0Ip route 192.168.1.0 255.255.255.0 s1/0