Re: 3 vlans and a problem

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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Received on Sun Nov 15 2009 - 15:20:42 ART