From: ccie anees (ccieanees@yahoo.com)
Date: Wed Jan 10 2007 - 14:57:33 ART
Hi Rocco,
This is the default value
Throttle SPF timers - controls SPF calculation interval
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
And please check the below notes.. There is no standard calculation for the third value. But please let me know after reading the below notes if you still confused..
1A. Throttle SPF timers
########################
R1(config-router)#timers throttle spf ?
<1-600000> Delay between receiving a change to SPF calculation in
milliseconds
R1(config-router)#timers throttle spf 15000 ?
<1-600000> Delay between first and second SPF calculation in milliseconds
R1(config-router)#timers throttle spf 15000 20000 ?
<1-600000> Maximum wait time in milliseconds for SPF calculations
R1(config-router)#timers throttle spf 15000 20000 80000 ?
<cr>
The above configuration indicates that when the topology change is received,
the router will wait for 15000 msec before starting the first SPF calculation.
After the first SPF calculation, the router will start the next SPF calculation after
20000 msec.
ANd if there is any topology change in the previous cycle,
wait time is twiced the previous delay
for example, between second and third the delay is 40000.
The wait time doubled every time the router receive topology change.
wait time doubles each time (in this case only three times 20000, 40000, 80000) and stay at 80000 max value and it stays until there is no topology change.
if there is no topology change there won' be any wait time. router's spf calculation will be idle.
once the topology change happens the above cycle starts.
Thanks,
Anees.
Rocco R21 <roccor21@hotmail.com> wrote:
Does anybody know what the max-wait timer should be set to after
manipulating the first two values? The IOS allows <1-600000> millsec . I
see Cisco Doc uses 90000 ms in their examples. Not sure if there's a
standard or rule to follow here.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/hirp_r/rte_osph.htm#wp1005185
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