Configuring type-3 lsa filtering, Configuring an ospf cost for an interface – H3C Technologies H3C S5560 Series Switches User Manual

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Use the gateway keyword to filter routing information by next hop.

Use an ACL or IP prefix list to filter routing information by destination address and at the same time
use the gateway keyword to filter routing information by next hop.

Use a routing policy to filter routing information.

To configure OSPF to filter routes calculated using received LSAs:

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
filter routes calculated

using received LSAs.

filter-policy { acl-number [ gateway
prefix-list-name ] | gateway prefix-list-name
| prefix-list prefix-list-name [ gateway

prefix-list-name ] | route-policy

route-policy-name } import

By default, OSPF accepts all
routes calculated using received

LSAs.

Configuring Type-3 LSA filtering

Perform this task to filter Type-3 LSAs advertised to an area on an ABR.
To configure Type-3 LSA filtering:

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.

Enter area view.

area area-id N/A

4.

Configure Type-3 LSA
filtering.

filter { acl-number | prefix-list
prefix-list-name | route-policy

route-policy-name } { export | import }

By default, the ABR does not
filter Type-3 LSAs.

Configuring an OSPF cost for an interface

Configure an OSPF cost for an interface by using either of the following methods:

Configure the cost value in interface view.

Configure a bandwidth reference value for the interface. OSPF computes the cost with this formula:
Interface OSPF cost = Bandwidth reference value (100 Mbps) / Expected interface bandwidth

(Mbps). The expected bandwidth of an interface is configured with the bandwidth command (see
Interface Command Reference).

{

If the calculated cost is greater than 65535, the value of 65535 is used. If the calculated cost is
less than 1, the value of 1 is used.

{

If no cost or bandwidth reference value is configured for an interface, OSPF computes the
interface cost based on the interface bandwidth and default bandwidth reference value.

To configure an OSPF cost for an interface:

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