Re: 3 vlans and a problem

Oh yes 3 vlans! ...my bad, you are right, pvlans cant do that alone.

2009/11/15 <Keegan.Holley_at_sungard.com>

>
> Why use private vlans for subnet conversions and not secondary ip? Also,
> he said he needed three vlans to share the same broadcast domain which
> private vlans alone cannot do. I agree that something was off with this
> post though. I think the reason why it's so hard to answer is that it was
> completely contrived by yet another newsgroup troll.
>
>
>
>
>
> From: Roy Waterman <roy.waterman_at_gmail.com> To: "<
> Keegan.Holley_at_sungard.com>" <Keegan.Holley_at_sungard.com> Cc: Gary Duncanson
> <gary.duncanson_at_googlemail.com>, "ccielab_at_groupstudy.com" <
> ccielab_at_groupstudy.com> Date: 11/15/2009 02:27 PM
> Subject: Re: 3 vlans and a problem
> ------------------------------
>
>
>
> Keegan
>
> One of the biggest reasons for using pvlans is subnet conservation. So
> yes they can, & should be in the same subnet. Whether they should/
> shouldn't intercommunicate is secondary (pardon the pun). Else we
> wouldn't have secondary community vlans.
>
> I answered pvlans myself but I also did nt like the tone of the
> poster. Whether people respond or not is up to them; berating people
> puts people like me off frankly.
>
> Sent from my iPhone
>
> On 15 Nov 2009, at 17:40, <Keegan.Holley_at_sungard.com> wrote:
>
> > Yea but (at least in my experience) they can't be used to bridge
> > three
> > different vlan's together and allow them to use the same IP range
> > freely.
> > The whole point of PVLAN is to restrict the communication of hosts
> > in the
> > same vlan not to allow it. So if everything in every vlan were
> > supposed
> > to talk freely you could only use one secondary vlan which seems to
> > leave
> > the other secondary (assuming the first vlan becomes the primary)
> > unused.
> >
> >
> >
> > From:
> > Gary Duncanson <gary.duncanson_at_googlemail.com>
> > To:
> > <Keegan.Holley_at_sungard.com>
> > Cc:
> > <ccielab_at_groupstudy.com>
> > Date:
> > 11/15/2009 05:52 AM
> > Subject:
> > Re: 3 vlans and a problem
> >
> >
> >
> > Not exactly. Private vlans can be used to achieve a number of
> > connectivity/non connectivity results between hosts and not just
> > outright
> > isolation. You can achieve that with regular vlans.
> > ----- Original Message -----
> > From: <Keegan.Holley_at_sungard.com>
> > To: "Johnny B CCIE" <jbccie_at_gmail.com>
> > Cc: "groupstudy" <ccielab_at_groupstudy.com>; <nobody_at_groupstudy.com>
> > Sent: Sunday, November 15, 2009 12:00 AM
> > Subject: Re: 3 vlans and a problem
> >
> >
> >> It all depends on whether the hosts in the subnet are supposed to be
> > able
> >> to talk. Private vlans are used to separate things not to connect
> >> them
> >> together. Can you give us the requirements exactly?
> >>
> >>
> >>
> >>
> >>
> >> From:
> >> Johnny B CCIE <jbccie_at_gmail.com>
> >> To:
> >> groupstudy <ccielab_at_groupstudy.com>
> >> Date:
> >> 11/14/2009 10:03 AM
> >> Subject:
> >> Re: 3 vlans and a problem
> >> Sent by:
> >> <nobody_at_groupstudy.com>
> >>
> >>
> >>
> >> So far 2 ccies have come to the same conclusion of private vlans
> >> maybe
> >> I was not clear enough with the question but I reworded my query very
> >> closely to the original question. I am not asking questions I do not
> >> already have an answer for by the way. I merely am starting a review
> >> of things I want to know perfectly before my trip to the lab.
> >>
> >> I suppose we can use private vlans to apply the same subnet mask but
> >> we would have achieved the exact opposite of the desired outcome for
> >> this question. So private vlans will achieve the the lab requirement
> >> to allow all three vlans to use the same subnet however 0 points will
> >> be awarded for the task. Maybe there will be points awarded for
> >> re-grade or maybe not. Anyone want to try again?
> >>
> >> On Sat, Nov 14, 2009 at 1:16 AM, Johnny B CCIE <jbccie_at_gmail.com>
> >> wrote:
> >>> Let's say I have 3 vlans (10, 20, and 30).
> >>> Let's say I have a lab requirement to configure all three vlans to
> >>> use
> >>> the same subnet: 172.16.10.0/24 (for each vlan).
> >>>
> >>> What options are available to make these three vlans appear to be in
> >>> the same subnet?
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
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>

-- 
Regards
Roy
Blogs and organic groups at http://www.ccie.net