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Step
3.
Enter OSPF view.
4.
(Optional.) Set the
LSU transmit
interval and the
maximum number
of LSUs that can be
sent at each
interval.
Enabling OSPF ISPF
When the topology changes, Incremental Shortest Path First (ISPF) computes only the affected part
of the SPT, instead of the entire SPT.
To enable OSPF ISPF:
Step
1.
Enter system view.
2.
Enter OSPF view.
3.
Enable OSPF ISPF.
Configuring prefix suppression
By default, an OSPF interface advertises all of its prefixes in LSAs. To speed up OSPF 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:
•
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:
Command
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
transmit-pacing interval interval count count
Command
system-view
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
ispf enable
93
Remarks
N/A
By default, an OSPF interface
sends a maximum of three
LSU packets every 20
milliseconds.
Remarks
N/A
N/A
By default, OSPF ISPF is
enabled.
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Troubleshooting
