Configuring Prefix Suppression - HP FlexFabric 12900E Series Configuration Manual

•
Clear the R-bit of the Option field in Type-1 LSAs. When the R-bit is clear, the OSPFv3 router
can participate in OSPFv3 topology distribution without forwarding traffic.
•
Use the OSPFv3 max-metric router LSA feature. This feature enables OSPFv3 to advertise its
locally generated Type-1 LSAs with a maximum cost of 65535. Neighbors do not send packets
to the stub router as long as they have a route with a smaller cost.
To configure a router as a stub router:
Step
1. Enter system view.
2. Enter OSPFv3 view.
3. Configure the router as
a stub router.

Configuring prefix suppression

By default, an OSPFv3 interface advertises all of its prefixes in LSAs. To speed up OSPFv3
convergence, you can suppress interfaces from advertising all of their prefixes. This feature helps
improve network security by preventing IP routing to the suppressed networks.
When prefix suppression is enabled:
•
OSPFv3 does not advertise the prefixes of suppressed interfaces in Type-8 LSAs.
•
On broadcast and NBMA networks, the DR does not advertise the prefixes of suppressed
interfaces in Type-9 LSAs that reference Type-2 LSAs.
•
On P2P and P2MP networks, OSPFv3 does not advertise the prefixes of suppressed interfaces
in Type-9 LSAs that reference Type-1 LSAs.
IMPORTANT:
As a best practice, configure prefix suppression on all OSPFv3 routers if you want to use prefix
suppression.
Configuring prefix suppression for an OSPFv3 process
Enabling prefix suppression for an OSPFv3 process does not suppress the prefixes of loopback
interfaces and passive interfaces.
To configure prefix suppression for an OSPFv3 process:
Step
1. Enter system view.
2. Enter OSPFv3 view.
Command
system-view
ospfv3 [ process-id | vpn-instance
vpn-instance-name ] *
•
Method
stub-router r-bit [ include-stub |
on-startup {
wait-for-bgp [ seconds ] } ] *
•
Method
stub-router
[ external-lsa [ max-metric-value ]
|
[ max-metric-value
include-stub |
{ seconds |
[ seconds ] } ] *
Command
system-view
ospfv3 [
vpn-instance
vpn-instance-name ] *
414
Remarks
N/A
N/A
1:
seconds |
By default, the router is not
2:
configured as a stub router.
max-metric
A stub router is not related to a
summary-lsa
stub area.
] |
on-startup
wait-for-bgp
Remarks
N/A
process-id |
N/A