3Com 7700 Configuration Manual page 100

92 C 5: R P
HAPTER OUTING
O
ROTOCOL PERATION
Configure 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.
Table 43 Configure OSPF to Import the Default Route
Operation
Import the default route to OSPF
Remove the imported default route undo default-route-advertise [ always ] [ cost ] [ type
By default, OSPF does not import the default route.
Set OSPF Route Preference
Since it is possible for multiple dynamic routing protocols to run on one router
concurrently, the problem of route sharing and selection between routing
protocols occurs. The system sets a priority for each routing protocol, which is
used in tie-breaking if different protocols discover the same route.
Perform the following configuration in OSPF view.
Table 44 Set 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.
Configure OSPF Route Filtering
Perform the following configuration in OSPF view.
Table 45 Enable OSPF to Filter the Imported Routes
Operation
Configure OSPF to fileter imported external routes
Disable to filter the imported
global routing information
Cancel to filter the imported
global routing information
Configure OSPF to filter distributed routes
Enable OSPF to filter the
distributed routes
Disable OSPF to filter the
distributed routes
Command
default-route-advertise [ always ] [ cost value ] [ type
type-value ] [ route-policy route-policy-name ]
] [ route-policy ]
Command
preference [ ase ] preference
undo preference [ ase ]
Command
filter-policy { acl-number | ip-prefix ip-prefix-name |
gateway prefix-list- name } import
undo filter-policy { acl-number | ip-prefix ip-prefix-name |
gateway prefix- list-name } import
filter-policy { acl-number | ip-prefix ip-prefix-name } export
[ routing- process ]
undo filter-policy { acl-number | ip-prefix ip-prefix-name }
export [ routing- process ]