Configure OSPF Route Generation

OSPF uses the network command to cover routes of the directly connected network segment. It can also redistribute external routes or use the host command to add host routes.

Configuration Condition

Before configuring OSPF route generation, ensure that:

• Interface IP addresses have been configured so that neighbor nodes are reachable at the network layer.
• Enable OSPF.

Configure OSPF to Redistribute Routes

If multiple routing protocols run on one device, routes of other protocols can be introduced to OSPF through redistribution. By default, class 2 external routes of OSPF are generated, with the routing metric 20. When you introduce external routes through redistribution, you can modify the external route type, metric, and tag field, and configure the required routing policy to perform route control and management.

Table 7-12 Configuring OSPF to Redistribute Routes

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  If the metric value of external routes are configured by using both the redistribute protocol [ protocol-id ] metric command and the default-metric command, the value that is configured by using the former command has a higher priority.

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Configure the Default OSPF Route

After an OSPF Stub area or a totally NSSA areas is configured, a Type-3 default route is generated. For an NSSA area, no default route is automatically generated. You can use the area area-id nssa default-information-originate command to introduce a Type-7 default route to the NSSA area.

OSPF cannot use the redistribute command to introduce a Type-5 default route. To do this, use the default-information originate [ always ] command.

Table 7-13 Configuring the Default OSPF Route

Configure the OSPF Host Route

Table 7-14 Configuring the OSPF Host Route