Configuration Prerequisites; Configuring Ospf Packet Timers - HP 3600 v2 series Configuration Manual

Configuration prerequisites

Before configuring OSPF network optimization, complete the following tasks:
Configure IP addresses for interfaces
•
Configure OSPF basic functions
•

Configuring OSPF packet timers

You can configure the following timers on OSPF interfaces as needed.
Hello timer—Interval for sending hello packets. It must be identical on OSPF neighbors. The longer
•
the interval, the lower the convergence speed, and the smaller the network load.
Poll timer—Interval for sending hello packets to a neighbor that is down on the NBMA network.
•
• Dead timer—Interval within which if the interface receives no hello packet from the neighbor, it
declares the neighbor is down.
LSA retransmission timer—Interval within which if the interface receives no acknowledgement
•
packets after sending an LSA to the neighbor, it retransmits the LSA.
Follow these steps to configure timers for OSPF packets:
To do...
Enter system view
Enter interface view
Specify the hello
interval
Specify the poll interval
Specify the dead
interval
Specify the
retransmission interval
NOTE:
The hello and dead intervals restore to default values after you change the network type for an interface.
•
The dead interval must be at least four times the hello interval on an interface.
•
• The poll interval is at least four times the hello interval.
The retransmission interval must not be so small to avoid unnecessary LSA retransmissions. In general,
•
this value is bigger than the round-trip time of a packet between two neighbors.
Use the command...
system-view
interface interface-type
interface-number
ospf timer hello seconds
ospf timer poll seconds
ospf timer dead seconds
ospf timer retransmit interval
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Remarks
—
—
Optional
The hello interval defaults to 10 seconds on P2P
and broadcast interfaces, and defaults to 30
seconds on P2MP and NBMA interfaces.
Optional
The poll interval defaults to 120 seconds.
Optional
The default dead interval is 40 seconds on P2P
and broadcast interfaces and 120 seconds on
P2MP and NBMA interfaces.
Optional
The retransmission interval defaults to 5
seconds.