Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 3 OSPF Configuration
3-34
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Dead timer: Interval within which if the interface receives no hello packet from the
neighbor, it declares the neighbor is down.
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LSA retransmission timer: Interval within which if the interface receives no
acknowledgement packets after sending a LSA to the neighbor, it will retransmit
the LSA.
Follow these steps to configure timers for OSPF packets:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter interface view
interface
interface-type
interface-number
—
Specify the hello interval
ospf timer hello
seconds
Optional
The hello interval on P2P,
Broadcast interfaces
defaults to 10 seconds and
defaults to 30 seconds on
P2MP and NBMA
interfaces.
Specify the poll interval
ospf timer poll
seconds
Optional
The poll interval defaults to
120 seconds.
Specify the dead interval
ospf timer dead
seconds
Optional
The default dead interval is
40 seconds on P2P,
Broadcast interfaces and
120 seconds on P2MP and
NBMA interfaces.
Specify the
retransmission interval
ospf timer retransmit
interval
Optional
The retransmission interval
defaults to 5 seconds.
Note:
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The hello and dead intervals restore to default values after you change the network
type for an interface.
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The dead interval should be at least four times the hello interval on an interface.
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The poll interval is at least four times the hello interval.
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The retransmission interval should not be so small for avoidance of unnecessary
LSA retransmissions. In general, this value is bigger than the round-trip time of a
packet between two adjacencies.
