First part of the command:
enter the ospf protocol ospf 1
area 0 delineation of autonomous regions because the experiments took only a regional parameter to 0 so that is the backbone area
network + network segment + Anti write mask (0.0.0.255) interface and the interface belongs specify the OSPF. That is where the network segment
display ospf interfac check OSPF interfaces notice
display ospf peer to view its neighbor device
The implementation of the autonomous system gateway between the internal interior gateway protocol interior gateway protocol abbreviated as IGP. Between the different autonomous systems with an external gateway protocol gateway protocol exterior abbreviated EGP. The latest meeting is called BGP EGP do it BORDER GATEWAY PROTOCOL
OSPF basic principles
In addition OSPF area introduced the concept of
experiment:
Shown above according to the configuration and port configuration for each IP
After the configuration of the communication with the test R1
Configure a single area OSPF network
Here router ID is 172.16.10.1
About DR and BDR appear above explanation:
DR specify a router, BDR refers to a backup designated router.
To reduce OSPF multiaccess network traffic, OSPF will select a designated router (DR) and a backup designated router (the BDR) . When the multi-access network changes, DR is responsible for updating all other OSPF routers. BDR monitors the DR of the state and take over its role in the current DR fails.
In the multi-channel access network, there may be multiple routers, a lot of overhead in order to avoid the establishment of full relations between the neighboring routers caused, OSPF required in the region to elect a DR. Each router is fully adjacent relationship with the establishment.
DR is responsible for collecting all the link state information and distribute it to other routers. DR election also elected a BDR, DR at the time of failure, BDR assume the responsibilities of DR. Ad hoc networks do not need DR, because there are only two nodes adjacent to each other completely.
display ip routing-table 查看学习后的路由表，红框框内是OSPF协议下学习到的路由，direct是直连网络。
测试连通性，理论上3台PC就都可互相ping通了
