H3C Technologies H3C S12500-X Series Switches - Manual (Page 93)

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Tuning and optimizing OSPF networks
You can use one of the following methods to optimize an OSPF network:
• Change OSPF packet timers to adjust the convergence speed and network load. On low-speed
links, consider the delay time for sending LSAs.
• Change the SPF calculation interval to reduce resource consumption caused by frequent network
changes.
• Configure OSPF authentication to improve security.
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Configuration prerequisites
Before you configure OSPF network optimization, complete the following tasks:
• Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
• Enable OSPF.
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Configuring OSPF timers
An OSPF interface includes the following timers:
• Hello timer—Interval for sending hello packets. It must be identical on OSPF neighbors.
• 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 a LSA to the neighbor, it retransmits the LSA.
To configure OSPF timers:
Step 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
By default:
• The hello interval on P2P and broadcast
interfaces is 10 seconds.
• The hello interval on P2MP and NBMA
interfaces is 30 seconds.
The default hello interval is restored when the
network type for an interface is changed.
4. Specify the poll
interval.
ospf timer poll seconds
The default setting is 120 seconds.
The poll interval is at least four times the hello
interval.