From: Mike Louis (louism@gcs.k12.nc.us)
Date: Thu May 25 2006 - 22:36:27 ART
I ran into an issue recently with Access Points being connected to switches with VTP pruning enabled in the domain.The VTP database had 50+ vlans in it. Since the APs could not tell the switches to only send them their configured Vlans ( 4 total) they said nothing via VTP. As a result the switches sent them all traffic from all vlans in the database on the AP trunk ports. In addition, the switches could not tell their upstream switches not send all traffic for all VLANs (since all of them were in STP forwarding state for the AP trunk ports) VTP pruning was not working as it should. The solution was to prune on the AP trunk ports and enable VTP pruning to work properly with the knowledge of all the STP forwarding information it needed to communicate to its upstream devices.
>>> "Scott Smith" <hioctane@gmail.com> 05/25/06 8:41 PM >>>
I should have been a little more clear with my question. I'm aware of
the common reasons why pruning doesn't work. Transparent, trunk with a
router, no VTP between the switches.
What I'm wondering is why there would ever be a reason to have both
VTP pruning enabled as well as manually removing the VLANs from the
trunk(s) aside from the "well known" reasons.
-Scott
On 5/25/06, Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
> What happens when you are in VTP transparent mode?
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
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>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > Sidalo
> > Sent: Thursday, May 25, 2006 4:54 PM
> > To: Scott Smith
> > Cc: groupstudy
> > Subject: Re: VLAN Pruning Static/Dynamic
> >
> > Basically no the instances where you can and can not use the pruning
> to
> > accomplish this.
> >
> > There was some good info that came through GS within the last couple
> weeks
> > on this, and I would suggest searching your emails or, the GS archive.
> > (gmail is great for being able to find those emails)
> >
> > On 5/25/06, Scott Smith <hioctane@gmail.com> wrote:
> > >
> > > With SW1 --trunk-- SW2 VTP/pruning enabled why would I need to
> > > manually prune VLANs? Is there something I'm unware of that can
> break
> > > pruning and force you to do it manually (switchport trunk allowed
> > > vlan)? I know a "router-on-a-stick" requires manual pruning since
> > > routers do not understand VTP.
> > >
> > > TIA
> > >
> > > -Scott
> > >
> > >
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