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ccna 200 301 syllabus examples of a grammar for biblical hebrew.From the above output, however, we find that R2 is DR, R1 is BDR, and R3 is DROther. why does this result? This is because the OSPF does not use the preemption mechanism for DR and BDR elections in order to guarantee the relative stability of the network. Suppose routers Rl, R2, and R3 start the OSPF process at the same time. According to the DR and BDR election order, the priority of each interface is 1 by default, and then the Router IDs are compared. In fact Rl, R2 and R3 do not start the OSPF process at the same time, the router that starts the OSPF process first will become DR, the one that starts the OSPF process second will become BDR, and the one that starts the OSPF process last will become DROthero that is why R2 is DR, R1 is BDR and R3 is DROther.Next restart R2's. SPF process. Execute on router R2: R2#clear ipospf process ResetALL OSPFprocesses?[no]: yWhich router now becomes the DR, and which router becomes the BDR? First let's analyze, R2 was DR,now DR leave. R1 will be upgraded from BDR to DR, R3 from DROther to BDR. r2's OSPFk2504Y Chapter 8 OSPF***process is rerun, both DR and BDR are attributed, and R2 can only become a DROther. Verify on router R3, which displays the following: R3#show ip ospf neighborNeighborID PriState DeadTimeAddress Interface 123.1.1.1 1FULL/DR 00:00:38 123.1.1.1 FastEthernetO/O 123.1.1.2 1FULL/DROTHER 00:00:34 123.1.1.2 FastEthernetO/OFrom the above output, we can see that R1 is DR, R2 is DROther, and R3 should be BDR, the result confirms the previous analysis.Suppose among the 3 routers, R1 has a very high hardware configuration, and you want R1 to be DR always, how should you configure it? As mentioned earlier, the first consideration is the priority of the interface in the election order of DR, can we set the priority of R1's Fa0/0 interface to 2, so that the router will always be the DR? The answer is no, because the election of DR and BDR in OSPF does not use the preemption mechanism, strictly according to the seniority to rank, if R1 reboot or leave for other reasons and come back, there are already DR and BDR in the network, R1 can only wait for the DR and BDR are out of order, then can upgrade to DR.One way to have R1 always be the DR is to set the priority of all other router interfaces in the network to 0. A priority of 0 means that the interface does not participate in the DR and BDR elections. Configure routes R2 and R3 as follows: R2(config)#int fa0/0 R2(config-if)#ip ospf priority 0 Change the priority of this interface to 0, which does not participate in the DR and BDR elections in OSPF.