Configuring Prefix Prioritization - HP FlexFabric 12900E Series Configuration Manual

•
On P2P and P2MP networks, OSPF does not advertise Type-3 links in Type-1 LSAs. Other
routing information can still be advertised to ensure traffic forwarding.
•
On broadcast and NBMA networks, the DR generates Type-2 LSAs with a mask length of 32 to
suppress network routes. Other routing information can still be advertised to ensure traffic
forwarding. If no neighbors exist, the DR does not advertise the primary IP addresses of
interfaces in Type-1 LSAs.
IMPORTANT:
As a best practice, configure prefix suppression on all OSPF routers if you want to use prefix
suppression.
Configuring prefix suppression for an OSPF process
Enabling prefix suppression for an OSPF process does not suppress the prefixes of secondary IP
addresses, loopback interfaces, and passive interfaces. To suppress the prefixes of loopback
interfaces and passive interfaces, enable prefix suppression on the interfaces.
To configure prefix suppression for an OSPF process:
Step
1. Enter system view.
2. Enter OSPF view.
3. Enable
suppression for the
OSPF process.
Configuring prefix suppression for an interface
Interface prefix suppression does not suppress prefixes of secondary IP addresses.
To configure interface prefix suppression:
Step
1. Enter system view.
2. Enter
view.
3. Enable
suppression for the
interface.

Configuring prefix prioritization

This feature enables the device to install prefixes in descending priority order: critical, high, medium,
and low. The prefix priorities are assigned through routing policies. When a route is assigned multiple
prefix priorities, the route uses the highest priority.
By default, the 32-bit OSPF host routes have a medium priority and other routes a low priority.
To configure prefix prioritization:
Step
1. Enter system view.
Command
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
prefix
prefix-suppression
Command
system-view
interface
interface interface-type interface-number
prefix
ospf prefix-suppression [ disable ]
Command
system-view
93
Remarks
N/A
N/A
By default, prefix suppression
is disabled for an OSPF
process.
Remarks
N/A
N/A
By default, prefix suppression
is disabled on an interface.
Remarks
N/A