Example 2: Virtual Links - IBM RackSwitch G8000 Application Manual

Example 2: Virtual Links

© Copyright IBM Corp. 2011
In the example shown in
backbone as is usually required. Instead, area 2 will be connected to the backbone
via a virtual link through area 1. The virtual link must be configured at each endpoint.
Figure 31. Configuring a Virtual Link
Switch 1 Switch 1
Note: OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see
Implementation in IBM N/OS" on page
Configuring OSPF for a Virtual Link on Switch #1
1. Configure IP interfaces on each network that will be attached to the switch.
In this example, two IP interfaces are needed:
– Interface 1 for the backbone network on 10.10.7.0/24
– Interface 2 for the transit area network on 10.10.12.0/24
RS G8000(config)# interface ip 1
RS G8000(config-ip-if)# ip address 10.10.7.1
RS G8000(config-ip-if)# ip netmask 255.255.255.0
RS G8000(config-ip-if)# enable
RS G8000(config-ip-if)# exit
RS G8000(config)# interface ip 2
RS G8000(config-ip-if)# ip address 10.10.12.1
RS G8000(config-ip-if)# ip netmask 255.255.255.0
RS G8000(config-ip-if)# enable
RS G8000(config-ip-if)# exit
2. Configure the router ID.
A router ID is required when configuring virtual links. Later, when configuring the
other end of the virtual link on Switch 2, the router ID specified here will be used
as the target virtual neighbor (nbr) address.
RS G8000(config)# ip router-id 10.10.10.1
3. Enable OSPF.
RS G8000(config)# router ospf
RS G8000(config-router-ospf)# enable
4. Define the backbone.
RS G8000(config-router-ospf)# area 0 area-id 0.0.0.0
RS G8000(config-router-ospf)# area 0 type transit
RS G8000(config-router-ospf)# area 0 enable
Figure 31, area 2 is not physically connected to the
279).
Switch 2 Switch 2
"OSPFv3
Chapter 22. OSPF
273