Configuring Received Ospf Route Filtering - HP FlexFabric 12900E Series Configuration Manual

Step
2. Enter OSPF view.
3. Enter OSPF area view.
4. Configure
summarization.
Configuring route summarization on an ASBR
Perform this task to enable an ASBR to summarize external routes within the specified address
range into a single route. The ASBR advertises only the summary route to reduce the number of
LSAs in the LSDB.
An ASBR can summarize routes in the following LSAs:
•
Type-5 LSAs.
•
Type-7 LSAs in an NSSA area.
•
Type-5 LSAs translated by the ASBR (also an ABR) from Type-7 LSAs in an NSSA area.
If the ASBR (ABR) is not a translator, it cannot summarize routes in Type-5 LSAs translated
from Type-7 LSAs.
To configure route summarization on an ASBR:
Step
1. Enter system view.
2. Enter OSPF view.
3. Configure ASBR route
summarization.

Configuring received OSPF route filtering

Perform this task to filter routes calculated using received LSAs.
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:
Step
1. Enter system view.
2. Enter OSPF view.
Command
ospf
[
router-id
vpn-instance-name ] *
area area-id
abr-summary
ABR route
{ mask-length | mask } [ advertise |
not-advertise ] [ cost cost-value ]
Command
system-view
ospf [ process-id | router-id router-id
| vpn-instance vpn-instance-name ]
*
asbr-summary
{ mask-length | mask } [ cost
cost-value
nssa-only | tag tag ] *
Command
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
router-id
process-id |
| vpn-instance
ip-address
ip-address
| not-advertise |
79
Remarks
N/A
N/A
By default, route summarization is
not configured on an ABR.
Remarks
N/A
N/A
By default, route summarization is
not configured on an ASBR.
Remarks
N/A
N/A