From: alexey (alexnetc@gmail.com)
Date: Wed Sep 19 2007 - 11:21:40 ART
hmm... link...
When you power up the switch, spanning tree is enabled by default, and every
interface in the switch, VLAN, or network goes through the blocking state
and the transitory states of listening and learning. Spanning tree
stabilizes each interface at the forwarding or blocking state.
When the spanning-tree algorithm places a Layer 2 interface in the
forwarding state, this process occurs:
* 1. *The interface is in the listening state while spanning tree waits for
protocol information to move the interface to the blocking state.
* 2. *While spanning tree waits the forward-delay timer to expire, it moves
the interface to the learning state and resets the forward-delay timer.
* 3. *In the learning state, the interface continues to block frame
forwarding as the switch learns end-station location information for the
forwarding database.
* 4. *When the forward-delay timer expires, spanning tree moves the
interface to the forwarding state, where both learning and frame forwarding
are enabled.
2007/9/19, Gregory Gombas <ggombas@gmail.com>:
>
> Alexey - are you saying that when a port first starts up, it skips the
> max age time and goes straight to forward delay?
>
> I have seen that as well because it normally takes about 30 seconds
> for a port to start forwarding after enabling a port.
>
> Can you share a link to this?
>
> Thanks
>
> On 9/19/07, alexey <alexnetc@gmail.com> wrote:
> > > 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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