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Configuring the LSU transmit rate
Sending large numbers of LSU packets affects router performance and consumes too much network
bandwidth. You can configure the router to send LSU packets at a proper interval and limit the
maximum number of LSU packets sent out of an OSPF interface each time.
To configure the LSU transmit rate:
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 the LSU
transmit rate.
transmit-pacing interval
interval
count
count
By default, an OSPF interface
sends a maximum of three
LSU packets every 20
milliseconds.
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 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. Enable OSPF ISPF.
ispf enable
By default, OSPF ISPF is
enabled.
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 function 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:
If you want to use prefix suppression, as a best practice, configure prefix suppression on all OSPF
routers.
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