HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 673

Interval Meaning
retransmit the minimum time
before sending a
new LSA
transmit delay the time assumed for
an LSA to reach a
peer
Interval Meaning
refresh the maximum time
before sending a new
LSA
shortest path first • the time between
(SPF) delay:
• calculation delay
• SPF hold
• the time between
C a u t i o n
Default Setting Range
5 seconds
1 second
In addition to customizing timers for interfaces, you can alter global OSPF
intervals, which are summarized in Table 13-9. You configure these intervals
from the OSPF configuration mode context.
The refresh interval, which dictates how often routers must send out an LSA,
must be such that routers can refresh their databases every 30 minutes. The
shortest path first (SPF) delay and hold timers save processing power by
preventing a router from continuously calculating new best routes.
Table 13-9. Global OSPF Intervals
Default
240 seconds
• 5 seconds
receiving
• 10 seconds
topological
changes and
beginning SFP
calculations
consecutive SFP
calculations
Do not change default intervals unless you have a great deal of experience
working with OSPF and understand the implications of the changes. Improp-
erly set intervals can disrupt router processes and congest the network.
IP Routing—Configuring RIP, OSPF, BGP, and PBR
Command Syntax
1 to 65,535 seconds ip ospf retransmit-interval
<seconds>
1 to 65,535 seconds ip ospf transmit-delay <seconds>
Range
10 to 1,800 seconds
(maximum of 30
minutes)
• 0 to 4,294,967,295
seconds
• 0 to 4,294,967,295
seconds
Configuring OSPF
Command Syntax
timers lsa-group-
pacing <seconds>
timers spf
<calculation
seconds> <hold
seconds>
13-59