From: alexey (alexnetc@gmail.com)
Date: Wed Sep 19 2007 - 08:55:55 ART
2007/9/19, davidytk <davidytk@netvigator.com>:
>
> Default the STP port from blocking to fowarding is 50s.
Don't agree!
http://cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094954.shtml
"...The movement of a port into the listening state indicates that there is
a change in the active STP topology and that a port will go from blocking to
forwarding."
For a definition of these changes is Max Age. But two timer Forward Delay
responsible for the transition from BLK to FWD!
This timer is
> related to forward delay and max age
>
> 50s = 2*forward delay + max age.
>
> Default forward delay = 15s
> Default max age = 20s
>
> I think the question is related to this item. But there is some other ways
> to minimum the timer.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> alexey
> Sent: Wednesday, September 19, 2007 5:53 PM
> To: ccielab@groupstudy.com
> Subject: Fwd: STP and Routing questions
>
> > 1. What about max age time? The minimum max age is 6 seconds.
> > Minimum forward delay is 4 seconds.
> >
> > So 6+(4*2) = 14 seconds is the minimum, isn't it?
> >
> > Someone please verify these numbers...
>
>
> This is not true. Because the question specifically about port startup
> (BLK
> -> FWD), rather than on the time of convergence network (Max Age +
> -> Forward
> Delay + Forward Delay).
>
>
> > On 9/17/07, hadek.el-ayachi@nsn.com <hadek.el-ayachi@nsn.com> wrote:
> > > Hi Experts,
> > > I have the following questions:
> > > 1- In a non root switch, make the startup time of ports in vlan 15
> > > equal to 12 seconds?
>
>
> All changes timers should be done only at the root switch. Changes timers
> at
> non-root switches will not lead to any results. Am I right?
>
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