3Com SuperStack 4 Configuration Manual page 134

146 C 6: IP R
HAPTER OUTING
P O
ROTOCOL PERATION
Table 152 Configuring Parameters for OSPF to Import External routes
Operation
Restore the default tag for the OSPF to import external
routes
Configure the default type of external routes that OSPF
will import
Restore the default type of the external routes imported
by OSPF
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
the
default-route-advertise
the routing table.
Perform the following configuration in OSPF View.
Table 153 Configuring OSPF to Import the Default Route
Operation
Import the default route to OSPF
Remove the imported default route undo default-route-advertise [ always |
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.
Table 154 Setting OSPF Route Preference
Operation
Configure a priority for OSPF for comparing with
the other routing protocols
Restore the default protocol priority
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.
command cannot be used to import the default route. Using
command, you can import the default route into
Command
default-route-advertise [ always | cost
value | type
route_policy_name
cost | type | route-policy ]*
Command
undo default tag
default type { 1 | 2 }
undo default type
type_value | route-policy
]*
Command
preference [ ase ]
undo preference [ ase ]
preference