3Com 10014299 1.1 4.4 E0 192.1.1.1/24, E0 192.1.1.4/24, E0 192.1.1.2/24 E0 10.1.2.3/24, 2.2 3.3

442CHAPTER 29: CONFIGURING OSPF

II.Networking diagram

Figure 148 Networking diagram of configuring “DR” selection of OSPF preference

1.1.1.1		4.4.4.4
DR
E0 192.1.1.1/24	Router A	Router D
		E0 192.1.1.4/24
E0 192.1.1.2/24		E0 10.1.2.3/24
		BDR
	Router B	Router C
	2.2.2.2	3.3.3.3

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

2Configure 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

3Configure 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

4Configure 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