H3C Technologies H3C S12500 Series Switches - Manual (Page 92)

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• You can specify a router ID when you create the OSPF process. Any two routers in an AS must have
different router IDs. A typical practice is to specify the IP address of an interface as the router ID.
• If you specify no router ID when you create the OSPF process, the global router ID is used. H3C
recommends specifying a router ID when you create the OSPF process.
OSPF can run multiple processes and supports VPNs as follows:
• To run multiple OSPF processes, you must specify an ID for each process. The process IDs take effect
locally and has no influence on packet exchange between routers. Two routers with different
process IDs can exchange packets.
• VPN support enables an OSPF process to run in a specified VPN.
Configuration procedure
To enable OSPF:
Step Command Remarks
1. Enter system view. System-view N/A
2. Configure a global router
ID.
router id router-id
Optional.
Not configured by default.
If no global router ID is configured, the
highest loopback interface IP address, if
any, is used as the router ID. If no loopback
interface IP address is available, the highest
physical interface IP address is used,
regardless of the interface status.
3. Enable an OSPF process
and enter OSPF view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
Not enabled by default.
4. Configure a description for
the OSPF process.
description description
Optional.
Not configured by default.
5. Configure an OSPF area
and enter OSPF area view. area area-id
Not configured by default.
6. Configure a description for
the area.
description description
Optional.
Not configured by default.
7. Specify a network to enable
OSPF on the interface
attached to the network.
network ip-address
wildcard-mask
Not configured by default.
A network segment can only belong to one
area.
Configuring OSPF areas
After you split an OSPF AS into multiple areas, you can configure some areas as stub areas or NSSA
areas as needed.
If no connectivity can be achieved between the backbone and a non-backbone area, or within the
backbone itself, configure virtual links to solve it.