3Com Switch 7750 Configuration Guide

318 CHAPTER 34: OSPF CONFIGURATION
Configuring the LSA
transmission delay
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The transmission of OSPF packets on a link also takes time. Therefore, a
transmission delay should be added to the aging time of LSAs before the LSAs are
transmitted. For a low-speed link, pay close attention on this configuration.
Configuring the SPF
Calculation Interval
Whenever the LSDB of OSPF is changed, the shortest paths need to be
recalculated. When the network changes frequently, calculating the shortest paths
immediately after LSDB changes will consume enormous resources and affect the
operation efficiency of the router. By adjusting the minimum SPF calculation
interval, you can lighten the negative affection caused by frequent network
changes.
Disabling OSPF Packet
Transmission on an
Interface
To prevent OSPF routing information from being acquired by the routers on a
certain network, use the silent-interface command to disable OSPF packet
transmission on the corresponding interface.
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■ On the same interface, you can disable multiple OSPF processes from
transmitting OSPF packets. The silent-interface command, however, only
applies to the OSPF interface where the specified process has been enabled,
without affecting the interface for any other process.
Table 243 Configure the LSA transmission delay
Operation Command Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure the LSA transmission delay ospf trans-delay seconds Optional
By default, the LSA
transmission delay is one
second.
Table 244 Set the SPF calculation interval
Operation Command Description
Enter system view system-view -
Enter OSPF view ospf [ process-id [ router-id
router-id ]]
-
Set the SPF calculation
interval
spf-schedule-interval interval Optional
By default, the SPF calculation
interval is five seconds.
Table 245 Disable OSPF packet transmission through an interface
Operation Command Description
Enter system view system-view -
Enter OSPF view ospf [ process-id [ router-id
router-id ]]
-
Disable OSPF packet
transmission on a specified
interface
silent-interface
silent-interface-type
silent-interface-number
Required
By default, all the interfaces are
allowed to transmit OSPF
packets.