146 CHAPTER 6: IP ROUTING PROTOCOL OPERATION
By default, when importing external routes, the type of imported route is type-2,
the cost is 1 and the tag is 1. The interval of importing the external route is 1
second. The upper limit to the external routes imported is 1000 per second.
Configuring OSPF to Import the Default Route
The import-route command cannot be used to import the default route. Using
the
default-route-advertise command, you can import the default route into
the routing table.
Perform the following configuration in OSPF View.
By default, OSPF does not import the default route.
Setting OSPF Route Preference
Since it is possible for multiple dynamic routing protocols to run concurrently on
one router, problems of route sharing and selection between various routing
protocols can occur. The system sets a priority for each routing protocol, which will
be used in tie-breaking in the case that different protocols discover the same
route.
Perform the following configuration in OSPF View.
By default, the OSPF preference is 10, and the imported external routing protocol
is 150.
Configuring OSPF Route Filtering
Perform the following configuration in OSPF View.
Restore the default tag for the OSPF to import external
routes
undo default tag
Configure the default type of external routes that OSPF
will import
default type { 1 | 2 }
Restore the default type of the external routes imported
by OSPF
undo default type
Table 153 Configuring OSPF to Import the Default Route
Operation Command
Import the default route to OSPF default-route-advertise [ always | cost
value
| type
type_value
| route-policy
route_policy_name
]*
Remove the imported default route undo default-route-advertise [ always |
cost | type | route-policy ]*
Table 154 Setting OSPF Route Preference
Operation Command
Configure a priority for OSPF for comparing with
the other routing protocols
preference [ ase ]
preference
Restore the default protocol priority undo preference [ ase ]
Table 152 Configuring Parameters for OSPF to Import External routes
Operation Command
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