Switch 7700 Configuration Guide

OSPF 95
Figure 6 Configuring DR Election Based on OSPF Priority
The commands listed in the following examples enable Switch A and Switch C to
be DR and BDR respectively. The priority of Switch A is 100, which is the highest
on the network, so it is elected as the DR. Switch C has the second highest priority,
so it is elected as the BDR. The priority of Switch B is 0, which means that it cannot
be elected as the DR. and Switch D does not have a priority, which takes 1 by
default.
1 Configure Switch A:
[Switch A] interface Vlan-interface 1
[Switch A-Vlan-interface1] ip address 196.1.1.1 255.255.255.0
[Switch A-Vlan-interface1] ospf dr-priority 100
[Switch A] router id 1.1.1.1
[Switch A] router ospf
[Switch A-ospf] network 196.1.1.0 0.0.0.255 area 0
2 Configure Switch B:
[Switch B] interface Vlan-interface 1
[Switch B-Vlan-interface1] ip address 196.1.1.2 255.255.255.0
[Switch B-Vlan-interface1] ospf dr-priority 0
[Switch B] router id 2.2.2.2
[Switch B] ospf
[Switch B-ospf] area 0
[Switch B-ospf-area-0.0.0.0] network 196.1.1.0 0.0.0.255
3 Configure Switch C:
[Switch C] interface Vlan-interface 1
[Switch C-Vlan-interface1] ip address 196.1.1.3 255.255.255.0
[Switch C-Vlan-interface1] ospf dr-priority 2
[Switch C] router id 3.3.3.3
[Switch C] ospf
[Switch C-ospf] area 0
[Switch C-ospf-area-0.0.0.0] network 196.1.1.0 0.0.0.255
4 Configure Switch D:
[Switch D] interface Vlan-interface 1
[Switch D-Vlan-interface1] ip address 196.1.1.4 255.255.255.0
[Switch D] router id 4.4.4.4
[Switch D] ospf
[Switch D-ospf] area 0
[Switch D-ospf-area-0.0.0.0] network 196.1.1.0 0.0.0.255
Switch A
1.1.1.1
DR
Switch D
Switch B
Switch C
4.4.4.4
2.2.2.2
3.3.3.3
BDR
196.1.1.4/24
196.1.1.3/24196.1.1.2/24
196.1.1.1/24