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OSPF can work normally only after being enabled on a router, regardless of the router’s type. On
an OSPF-enabled router, use the default values of parameters, such as the transmit interval of
OSPF packets, LSA delay timer, and SPF calculation interval, or configure them as required.
Network planning is needed before OSPF configuration on routers. The configurations for routers
in an area are performed on the area basis. Wrong configurations may cause communication
failures, even routing information blocks, or routing loops between neighboring routers.
Enabling OSPF
You must enable OSPF before you can perform other OSPF configuration tasks.
Prerequisites
Before configuring OSPF, you must configure the link layer protocol and IP addresses for
interfaces, making neighboring nodes accessible with each other at the network layer.
Configuration procedure
To enable OSPF on a router, create an OSPF process and specify areas with which the process is
associated, and the network segments contained in each area. If an interface’s IP address resides
on a network segment of an area, the interface belongs to the area and is enabled with OSPF,
and OSPF advertises the direct route of the interface.
To run OSPF, a router must have a Router ID, which is the unique identifier of the router in the AS.
Following is additional information about Router IDs:
•
You can specify a Router ID when creating the OSPF process. Any two routers in an AS must
have different Router IDs. In practice, the ID of a router is the IP address of one of its
interfaces.
•
If you specify no Router ID when creating the OSPF process, the global Router ID will be
used. For details about a global Router ID, see
IP Routing Basics
in the
Layer 3 – IP Routing
Configuration Guide
. H3C rec specifying a Router ID when creating the OSPF process.
The system supports OSPF multiprocess and OSPF multi-instance as follows:
•
When a router runs multiple OSPF processes, specify a Router ID for each process, which
takes effect locally and has no influence on packet exchange between routers. This means
that two routers with different process IDs can exchange packets.
•
You can configure an OSPF process to run in a specified VPN instance.
To do…
Use the command…
Remarks
Step 1
Enter system view
System-view
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