HP VPN Firewall Appliances Network Management Configuration Guide

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small can cause unnecessary LSA retransmissions. This interval is typically set bigger than the
round-trip time of a packet between two neighbors.
To configure timers for OSPF packets:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface
view.
interface interface-type
interface-number
N/A
3. Specify the hello
interval.
ospf timer hello seconds
Optional.
The hello interval defaults to 10 seconds on P2P and
broadcast interfaces, and defaults to 30 seconds on
P2MP and NBMA interfaces.
The default hello interval is restored when the network
type for an interface is changed.
4. Specify the poll
interval.
ospf timer poll seconds
Optional.
The poll interval defaults to 120 seconds.
5. Specify the dead
interval.
ospf timer dead seconds
Optional.
By default:
• The dead interval on P2P and broadcast interfaces
is 40 seconds.
• The dead interval on P2MP and NBMA interfaces
is 120 seconds.
The default dead interval is restored when the network
type for an interface is changed.
6. Specify the
retransmission
interval.
ospf timer retransmit
interval
Optional.
The retransmission interval defaults to 5 seconds.
Specifying LSA transmission delay
Because OSPF packets need time for transmission on links, extending the LSA age time by adding a
transmission delay is necessary, especially for low-speed links.
To specify the LSA transmission delay on an interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Specify the LSA transmission
delay.
ospf trans-delay seconds
Optional.
The default setting is 1 second.
Specifying SPF calculation interval
LSDB changes result in SPF calculations. When the topology changes frequently, a large amount of
network and router resources are occupied by SPF calculation. You can adjust the SPF calculation interval
to reduce the impact.