HP MSR2000/3000/4000 Router Series Layer 3 - IP Routing Configuration Guide

87
Ste
p
Command Remarks
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
An OSPF interface by default advertises all its prefixes in LSAs. You can suppress interfaces from
advertising all its prefixes to speed up OSPF convergence. This function also helps improve the network
security by preventing IP routing toward the suppressed networks.
When prefix suppression is enabled:
• On P2P and P2MP networks, OSPF does not advertise Type-3 links in Router LSAs.
• On broadcast and NBMA networks, the DR generates Network LSAs with a mask length of 32 to
suppress network routes. If no neighbors exist, the DR does not advertise the primary IP addresses
of interfaces in Router LSAs.
• OSPF does not advertise the host routes of loopback interfaces.
IMPORTANT:
If you want to use prefix suppression, HP recommends that you confi
g
ure prefix suppression on all OSPF
routers.
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 configure prefix suppression for an OSPF process:
Ste
p
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 prefix
suppression for the
OSPF process.
prefix-suppression
By default, prefix suppression
is disabled for an OSPF
process.
Configuring prefix suppression on an interface
Interface prefix suppression does not suppress prefixes of secondary IP addresses.
To configure interface prefix suppression: