3Com Switch 8800 Advanced Software V5 Configuration Guide

Tuning and Optimizing an OSPFv3 Network 361
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■ The dead interval set on neighboring interfaces cannot be so small. Otherwise,
a neighbor is so easy to be considered as down.
■ The LSA retransmission interval cannot be so small to avoid unnecessary
retransmissions.
Configuring the DR
Priority for an Interface
To configure the DR priority for an interface, use the following commands:
n
The DR priority of an interface determines the interface’s qualification in DR
election. Interfaces having the priority 0 cannot become a DR or BDR.
Ignoring MTU Check for
DD Packets
When LSAs are few in DD packets, it is unnecessary to check MTU in DD packets in
order to improve efficiency.
To ignore MTU check for DD packets, use the following commands:
Configure the hello
interval
ospfv3 timer hello seconds [
instance instance-id ]
Optional
Defaults to 10 seconds on P2P,
broadcast interfaces
Configure the dead
interval
ospfv3 timer dead seconds [
instance instance-id ]
Optional
Defaults to 40 seconds on P2P,
broadcast interfaces
Configure the LSA
retransmission interval
ospfv3 timer retransmit
interval [ instance instance-id ]
Optional
Defaults to 5 seconds
Configure the LSA
transmission delay
ospfv3 trans-delay seconds [
instance instance-id ]
Optional
Defaults to 1 second
Return to system view quit -
Enter OSPFv3 view ospfv3 [ process-id ] -
Configure the SPF timer spf timers delay-interval
hold-interval
Optional
By default, delay-interval is 5
seconds, and hold-interval is 10
seconds
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type interface-number -
Configure the DR
priority
ospfv3 dr-priority priority [ instance
instance-id ]
Optional
Defaults to 1
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Ignore MTU check
for DD packets
ospfv3 mtu-ignore [ instance
instance-id ]
Required
After this command is configured,
the interface will not check the MTU
field of incoming DD packets.