From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Aug 30 2006 - 13:21:57 ART
The layer 2 network design will also determine whether the
maxage timer plays a role or not. If there is a local link failure and
a local blocking port starts to go through the forwarding delay maxage
does not come into play. If the failure is indirect but backbonefast is
enabled maxage also does not come into play. Also considering there are
only two switches in the lab any failure of an ethernet link will always
be directly connected to the switches.
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Sean C
> Sent: Wednesday, August 30, 2006 10:49 AM
> To: ROCHA Leandro ORANGE-FT; Aamir Aziz
> Cc: GroupStudy
> Subject: Re: Forward-delay time
>
> Hi Leandro,
>
> If the task was asking to go from blocking to forwarding state in
under 16
> secs, wouldn't that be when you would take into consideration the
max-age
> timer?
>
> This task specifically states to alter the forward-delay time only,
> nothing
> about altering the entire STP equation - "Configure the forward-delay
time
> of a Vlan X under 16 seconds." Taking the task into consideration, I
> would
> just alter the forward-time to a value of 7.
>
> I understand what you're trying to do, I'm just not sure that your
answer
> would meet the requirements of this task.
>
> Also, Aamir - to answer the 2nd part of your original post - "do we
need
> to
> issue this command on both the switches or only on where the Vlan X
> exists." - while, technically, you would only need to apply it to a
switch
> where the vlan exists - personally - as long as the vlan in question
is
> able
> to be on the 2nd switch (no vlan pruning, or the switch w/out the vlan
is
> a
> VTP transparent switch, etc...), I would apply the timer to both
switches.
> Or, if I was really questioning it, I would ask the proctor something
> along
> the lines of "Should I take into consideration the chances of that
vlan
> being used on the 2nd switch in the future?...."
>
> HTH,
> Sean
>
> ----- Original Message -----
> From: "ROCHA Leandro ORANGE-FT" <leandro.rocha@orange-ft.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, August 30, 2006 10:05 AM
> Subject: RE: Forward-delay time
>
>
> > I think we have to take in account the max-age timer too.
> >
> > To have less than 16 seconds in any case, we should put max-age to 6
and
> > fwd-delay to 4 (the minimum values).
> >
> > Then we have a total of 6+4+4=14.
> >
> > Leandro
> >
> >
> >
> >
> >
> > "Brian McGahan" <bmcgahan@internetworkexpert.com>
> > Sent by: nobody@groupstudy.com
> > 08/30/06 10:39 AM
> > Please respond to "Brian McGahan"
> >
> >
> > To: "Aamir Aziz" <aamiraz77@gmail.com>,
> <ccielab@groupstudy.com>
> > cc:
> > bcc:
> > Subject: RE: Forward-delay time
> >
> >
> >
> > The forward-delay command configures each of the listening and
> > learning phase timers. This means that if you have it configured as
15
> > that it will take 30 seconds to go through both phases. If you want
to
> > move from blocking to forwarding in less than 16 seconds your
forward
> > delay would have to be 8 or lower.
> >
> > Brian McGahan, CCIE #8593
> > bmcgahan@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987 x 705
> > Outside US: 775-826-4344 x 705
> > 24/7 Support: http://forum.internetworkexpert.com
> > Live Chat: http://www.internetworkexpert.com/chat/
> >
> >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
Behalf
> > Of
> > > Aamir Aziz
> > > Sent: Wednesday, August 30, 2006 6:48 AM
> > > To: ccielab@groupstudy.com
> > > Subject: Forward-delay time
> > >
> > > Hi there,
> > >
> > > If the task says Configure the forward-delay time of a Vlan X
under 16
> > > second then what value do we use 15 or 16?
> > >
> > > #spanning-tree VLAN X forward-time 15 or 16
> > >
> > > since by default it is 15, and do we need to issue this command on
> > both
> > > the
> > > switches or only on where the Vlan X exists.
> > >
> > > Thanks
> > > Aamir
> > >
> > >
> >
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