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Posted by on May 9, 2008, 8:15 pm
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otmail.com> wrote:
> On May 9, 4:01 pm, aaabb...@hotmail.com wrote:
>
> > > In my experience, RSTP can be from around 1 second down to less than
> > > 50 msec. It all depends on what broke in the network.
> > Thanks,
> > The port to change stage is not depends on hello package. right?
> > For RSTP it has alternate port and backup port. The alternate port
> > I can think it is blocking port in STP in another switch. How about
> > buckup
> > port, does it need to be config manually?
>
> The alternate and/or backup links are computed automatically. To
> detect a failed link, you don't use hello packets, but rather the
> MAC_Operational parameter, which in turn is set according to each
> specific LAN type. The reason failure detection can be so fast is that
> in modern LANs, the active or backup/alternate link should never be
> quiescent, even when idle, so if an alternate path is available, it
> can be activated very quickly.
>
> This is in IEEE 802.1D, Clause 17, which then refers to other clauses
> in the same Standard.
>
> Bert
Thanks,
I am trying to understand your "words"
For backup port, assume there are multiple ports on the same segement,
before topology change, Does the backup port automatically random
selected? after the active port down, the backup port immediately
become active port.
I think it shouls impact whole tree.
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