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442 CHAPTER 29: CONFIGURING OSPF
II. Networking diagram
Figure 148 Networking diagram of configuring “DR” selection of OSPF preference
III. Configuration procedure
1 Configure Router A:
[RouterA] interface ethernet 0
[RouterA-Ethernet0] ip address 192.1.1.1 255.255.255.0
[RouterA-Ethernet0] ospf dr-priority 100
[RouterA-Ethernet0] quit
[RouterA] router id 1.1.1.1
[RouterA] ospf enable
[RouterA-ospf] interface ethernet 0
[RouterA-Ethernet0] ospf enable area 0
2 Configure Router B:
[RouterB] interface ethernet 0
[RouterB-Ethernet0] ip address 192.1.1.2 255.255.255.0
[RouterB-Ethernet0] ospf dr-priority 0
[RouterB-Ethernet0] quit
[RouterB] router id 2.2.2.2
[RouterB] ospf enable
[RouterB-ospf] interface ethernet 0
[RouterB-Ethernet0] ospf enable area 0
3 Configure Router C:
[RouterC] interface ethernet 0
[RouterC-Ethernet0] ip address 192.1.1.3 255.255.255.0
[RouterC-Ethernet0] ospf dr-priority 2
[RouterC-Ethernet0] quit
[RouterC] router id 3.3.3.3
[RouterC] ospf enable
[RouterC-ospf] interface ethernet 0
[RouterC-Ethernet0] ospf enable area 0
4 Configure Router D:
[RouterD] interface ethernet 0
[RouterD-Ethernet0] ip address 192.1.1.4 255.255.255.0
[RouterD-Ethernet0] quit
[RouterD] router id 4.4.4.4
[RouterD] ospf enable
[RouterD-ospf] interface ethernet 0
[RouterD-Ethernet0] ospf enable area 0
BDR
Router B
Router A Router D
Router C
E0 192.1.1.1/24
E0 192.1.1.4/24
E0 10.1.2.3/24
E0 192.1.1.2/24
DR
1.1.1.1
4.4.4.4
3.3.3.3
2.2.2.2