IBM RackSwitch G8000, Application Manual

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© Copyright IBM Corp. 2011 Chapter 22. OSPF
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Example 1: Simple OSPF Domain
In this example, two OSPF areas are defined—one area is the backbone and the
other is a stub area. A stub area does not allow advertisements of external routes,
thus reducing the size of the database. Instead, a default summary route of IP
address 0.0.0.0 is automatically inserted into the stub area. Any traffic for IP
address destinations outside the stub area will be forwarded to the stub area’s IP
interface, and then into the backbone.
Figure 30. A Simple OSPF Domain
Follow this procedure to configure OSPF support as shown in Figure 30 :
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 backbone network on 10.10.7.0/24
– Interface 2 for the stub area network on 10.10.12.0/24
Note: OSPFv2 supports IPv4 only. IPv6 is supported in OSPFv3 (see “OSPFv3
Implementation in IBM N/OS” on page 279 ).
2. Enable OSPF.
3. Define the backbone.
The backbone is always configured as a transit area using
areaid 0.0.0.0
.
Network
10.10.12.0/24
10.10.7.0/24
Network
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
RS G8000(config)#
router ospf
RS G8000(config-router-ospf)#
enable
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