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Configuring OSPF to Redistribute External Routes
Follow these steps to configure OSPF to redistribute external routes:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter OSPF view
ospf [ process-id [ router-id
router-id ] ]
—
Configure OSPF to
redistribute routes from
another protocol
import-route protocol [ process-id ]
[ cost value | type value | tag value |
route-policy route-policy-name ] *
Required
By default, OSPF does not
import the routing information
of other protocols.
Configure OSPF to filter
outgoing routes
filter-policy { acl-number | ip-prefix
ip-prefix-name } export [ protocol ]
Optional
By default, OSPF does not filter
advertised routes.
Enable OSPF to import
the default route
default-route-advertise [ always |
cost value | type type-value |
route-policy route-policy-name ]*
Optional
By default, OSPF does not
import the default route.
Configure the default
parameters for
redistributed routes,
including cost, interval,
limit, tag, and type
default { cost value | interval
seconds | limit routes | tag tag | type
type } *
Optional
These parameters respectively
default to:
z Cost: 1
z Interval: 1 (second)
z Limit: 1000
z Tag: 1
z Type: 2
z The import-route command cannot import the default route. To import the default route, you must
use the default-route-advertise command.
z The filtering of advertised routes by OSPF means that OSPF only converts the external routes
meeting the filter criteria into Type-5 or Type-7 LSAs and advertises them.
z When enabling OSPF to import external routes, you can also configure the defaults of some
additional parameters, such as cost, limit, tag, and type. A route tag can be used to identify
protocol-related information.
OSPF Network Adjustment and Optimization
You can adjust and optimize an OSPF network in the following aspects:
z By changing the OSPF packet timers, you can adjust the convergence speed of the OSPF network
and the network load brought by OSPF packets. On some low-speed links, you need to consider
the delay experienced when the interfaces transmit LSAs.
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