From: Guoxing Jiang (jianggx@xxxxxxxxxxxxxxxxxxx)
Date: Mon Oct 16 2000 - 07:42:52 GMT-3
Hello
Before today I think I know the rip timers very clearly, but I am so puzzled
now after I did some practice. The default timers for rip is 30 180 180 240.
I think the flush timers just start at the same time as holddown timer. But
in practice, I found that isn't true, I remove one network from rip network,
after 180 sec, the route in routing table became possibly down and the holddown
timers was really started, I thought the flush timers should started at this ti
me
too. But just after 60 sec, the route was flushed from the routing
table. It seems the flush timers started for the last update time. I want to fi
nd
some things useful in the CCO. But I am more puzzled, they say the
flush timers should set more than holddown timers(that's very true), but they d
on't
say when the flush timers start( but in many books the authors say the flush
timers start at the same time as holddnow timers and I think it is reasonable).
and there is a example after explaining the command in the CCO. The timers is
5 15 15 30. 30 = 15 + 15. they explain that the route will became possibly donw
after 15 sec and after another 15 sec holddown, the route will be flushed.
Maybe I can think the flush timer should no more than the sum of
invalid and holddow timer. why they don't set the default timers to
30 180 180 360. when do the flush timers start at all? from the last update
or just from the time when the route becam possibly down.
one more thing, if I shutdown one interface. the route became possibly down soo
n.
I using "show ip route *.*.*.* " check the info about the timer. I saw the
last update timers is auto added by 180 sec, and after another 60 sec, the rout
e
was flushed. That really accelerate the convergence. but it let me more puzzled
.
can you explain clearly to me?
thanks.
jiang
-- Best regards, Guoxing Jiang mailto:jianggx@transcentury.com.cn
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