3Com Switch 4800G 24-Port Configuration Manual page 301

Prerequisites
Configuring OSPF Packet
Timers
Change OSPF packet timers to adjust the OSPF network convergence speed
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and network load. On low speed links, you need to consider the delay time for
sending LSAs on interfaces.
Change the interval for SPF calculation to reduce resource consumption caused
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by frequent network changes.
Configure OSPF authentication to meet high security requirements of some
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mission-critical networks.
Configure OSPF network management functions, such as binding OSPF MIB
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with a process, sending trap information and collecting log information.
Before configuring OSPF network optimization, you have configured:
IP addresses for interfaces;
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OSPF basic functions.
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You can configure the following timers on OSPF interfaces as needed:
Hello timer: Interval for sending hello packets. It must be identical on OSPF
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neighbors. The longer the interval, the lower convergence speed and smaller
network load.
Poll timer: Interval for sending hello packets to the neighbor that is down on
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the NBMA network.
Dead timer: Interval within which if the interface receives no hello packet from
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the neighbor, it declares the neighbor is down.
LSA retransmission timer: Interval within which if the interface receives no
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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...
Enter system view
Enter interface view
Specify the hello interval ospf timer hello seconds
Specify the poll interval
Specify the dead
interval
Specify the
retransmission interval
Configuring OSPF Network Optimization
Use the command...
system-view
interface interface-type
interface-number
ospf timer poll seconds
ospf timer dead seconds
ospf timer retransmit
interval
Remarks
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-
Optional
The hello interval on P2P, Broadcast
interfaces defaults to 10 seconds 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, Broadcast interfaces
and 120 seconds on P2MP and
NBMA interfaces.
Optional
The retransmission interval defaults
to 5 seconds.
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