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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
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 ASBR route
summarization.
asbr-summary
ip-address
{
mask-length
|
mask
} [
cost
cost-value
|
not-advertise
|
nssa-only
|
tag tag
] *
By default, route summarization is
not configured on an ASBR.
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
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
{
ipv4-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.
Summary of Contents for HPE FlexNetwork 7500 series
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