R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

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The following filtering methods are available:

• Use an ACL or IP prefix list to filter routing information by destination address.

• 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. 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:

Ste

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:

Ste

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.