H3C Technologies H3C S12500-X Series Switches - Manual (Page 91)

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Configuring OSPF preference
A router can run multiple routing protocols, and each protocol is assigned a preference. If multiple routes
are available to the same destination, the one with the highest protocol preference is selected as the best
route.
To configure OSPF preference:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ] *
N/A
3. Configure a
preference for OSPF.
preference [ ase ] [ route-policy
route-policy-name ] value
By default, the preference of OSPF
internal routes is 10 and the preference
of OSPF external routes is 150.
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Configuring OSPF route redistribution
On a router running OSPF and other routing protocols, you can configure OSPF to redistribute routes
from other protocols, such as RIP, IS-IS, BGP, static, and direct, and advertise them in Type-5 LSAs or
Type-7 LSAs. In addition, you can configure OSPF to filter redistributed routes so that OSPF advertises
only permitted routes.
IMPORTANT:
The import-route bgp command redistributes only EBGP routes. Because the import-route bgp
allow-ibgp command redistributes both EBGP and IBGP routes, and mi
ght cause routing loops, use it with
caution.
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Configuring OSPF to redistribute routes from another routing protocol
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
N/A
3. Configure OSPF to
redistribute routes from
another routing protocol.
import-route protocol [ process-id |
all-processes | allow-ibgp ] [ cost cost |
nssa-only | route-policy
route-policy-name | tag tag | type type ]
*
By default, no route redistribution
is configured.
This command redistributes only
active routes. To view information
about active routes, use the
display ip routing-table protocol
command.
4. (Optional.) Configure
OSPF to filter redistributed
routes.
filter-policy { acl-number | prefix-list
prefix-list-name } export [ protocol
[ process-id ] ]
By default, OSPF accepts all
redistributed routes.