3com 3031 Instruccion De Instalación

C

HAPTER

 40: OSPF C

ONFIGURATION

1 Configure Router A:

[Router A]interface ethernet 1/0/0

[Router A-Ethernet1/0/0]ip address 172.10.1.2 255.255.0.0

[Router A-Ethernet1/0/0]quit

[Router A]router id 10.10.1.2

[Router A]ospf 100

[Router A-ospf-100]area 0

[Router A-ospf-100-area-0.0.0.0]network 172.10.0.0 0.0.255.255

2 Configure Router B:

[Router B]router id 10.10.4.2

[Router B]interface ethernet 1/0/0

[Router B-Ethernet1/0/0]ip address 172.10.1.1 255.255.0.0

[Router B-Ethernet1/0/0]quit

[Router B]interface ethernet 2/0/0

[Router B-Ethernet2/0/0]ip address 131.108.1.3 255.255.0.0

[Router B-Ethernet2/0/0]quit

[Router B]ospf 100 router-id 10.10.20.1

[Router B-ospf-100]area 0

[Router B-ospf-100-area-0.0.0.0]network 172.10.0.0 0.0.255.255

[Router B-ospf-100]quit

[Router B]ospf 200 router-id 10.10.20.2

[Router B-ospf-200]area 0

[Router B-ospf-200-area-0.0.0.0]network 131.108.0.0 0.0.255.255

3 Configure Router C:

[Router C]interface ethernet 2/0/0

[Router C-Ethernet2/0/0]ip address 131.108.1.1 255.255.0.0

[Router C-Ethernet2/0/0]quit

[Router C]router id 10.10.3.2

[Router C]ospf 200

[Router C-ospf-200]area 0

[Router C-ospf-200-area-0.0.0.0]network 131.108.0.0 0.0.255.255

Execute the

command on Router B to view the neighbor 

creation. You will find that Router B and Router A form neighboring relationship in 
the OSPF process 100; while Router A and Router C cannot learn the routes from 
the peer via OSPF.

In the following figure, the priority of Router A is 100, which is the highest in the 
network, so it is elected as the DR; Router C has the second highest priority, so it is 
elected as the BDR; The priority of Router B is 0, it means that it cannot be elected 
as the DR, and Router D does not have a priority, so the priority is 1 by default.