Technical data

BLADE OS 5.1 Application Guide
BMD00136, November 2009 Chapter 11: OSPF
 165
Configuring OSPF for a Virtual Link on Switch #2
1. Configure IP interfaces on each network that will be attached to OSPF areas.
In this example, two IP interfaces are needed:
 Interface 1 for the transit area network on 10.10.12.0/24
 Interface 2 for the stub area network on 10.10.24.0/24
2. Configure the router ID.
A router ID is required when configuring virtual links. This router ID should be the same one
specified as the target virtual neighbor (nbr) on switch 1 in Step 8 on page 164.
3. Enable OSPF.
4. Define the backbone.
This version of BLADE OS requires that a backbone index be configured on the non-backbone end
of the virtual link as follows:
5. Define the transit area.
>> # interface ip 1
>> (config-ip-if)# ip address 10.10.12.2
>> (config-ip-if)# ip netmask 255.255.255.0
>> (config-ip-if)# enable
>> (config-ip-if)# exit
>> # interface ip 2
>> (config-ip-if)# ip address 10.10.24.1
>> (config-ip-if)# ip netmask 255.255.255.0
>> (config-ip-if)# enable
>> (config-ip-if)# exit
>> # ip router-id 10.10.14.1
>> # router ospf
>> (config-router-ospf)# enable
>> (config-router-ospf)# area 0 area-id 0.0.0.0
>> (config-router-ospf)# area 0 enable
>> (config-router-ospf)# area 1 area-id 0.0.0.1
>> (config-router-ospf)# area 1 type transit
>> (config-router-ospf)# area 1 enable