From: James Ventre (messageboard@ventrefamily.com)
Date: Fri May 26 2006 - 07:45:39 ART
Yep. Transparent (or OFF) w/ manual pruning is the best practice
suggestion from Cisco.
James
Nick Griffin wrote:
> Thats a great real world example, of a great use of manual vlan pruning
> on trunk links.
>
> Mike Louis wrote:
>> 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
>>>
>>> Internetwork Expert, Inc.
>>> http://www.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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