3Com Switch 7700 Configuration Manual page 132

124 C 5: IP R
HAPTER OUTING
Example: OSPF
Configuration
P O
ROTOCOL PERATION
Table 53 Displaying and Debugging OSPF
Operation
Display the information of OSPF ABR and
ASBR
Display OSPF interface information
Display OSPF errors
Configuring DR Election Based on OSPF Priority
In this example, four Switch 7700 routers, Switch A, Switch B, Switch C, and
Switch D, which can perform the router functions and run OSPF, are located on
the same segment, as shown in Figure 6.
Figure 6 Configuring DR Election Based on OSPF Priority
Switch A
1.1.1.1
DR
196.1.1.1/24
196.1.1.2/24
2.2.2.2
Switch B
The commands listed in the following examples enable Switch A and Switch C to
be DR and BDR. 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] ospf
[Switch A-ospf-1] area 0
[Switch A-ospf-1-area-0.0.0.0]network 196.1.1.0 0.0.0.255
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-1] area 0
[Switch B-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255
3 Configure Switch C:
[Switch C] interface Vlan-interface 1
Command
display ospf [ process-id ] abr-asbr
display ospf [ process-id ] interface
display ospf [ process-id ] error
Switch D
4.4.4.4
196.1.1.4/24
196.1.1.3/24
BDR
3.3.3.3
Switch C