From: CCIE3000 (ccie3000@googlemail.com)
Date: Mon Jun 23 2008 - 14:11:13 ART
Yep, this is true...but even when you use another vlan as native and remove
that vlan it still works okay.
I've been reading through the docs but haven't found anything to explain why
yet.
Stop the press........
Reading Sadiq's post got me thinking.
Okay, I've got a SVI for vlan 3 on both switches, with trunk between them,
no etherchannel
Native vlan is 3, but only 4 and 5 are permitted.
Okay, trunk stays up but you are unable to ping between the two SVI's.
I'm in uncharted territory here so I hope the following isn't complete bull.
So the switch trunk allowed vlan stops the data traffic but doesn't stop the
control traffic for the trunk.
As I said, Sadiq's post caused the light bulb to switch on.
How's that sound?
On 6/23/08, A.G. Ananth Sarma (GMail) <ananth.sarma@gmail.com> wrote:
>
> Hi,
>
> it is not the question of permitting. In the first place, you cannot remove
> VLAN 1.
>
> See note below:
>
>
> ------------------------------
> *Note *VLANs 1 and 1002 to 1005 are reserved and cannot be removed.
>
>
> http://www.cisco.com/en/US/docs/switches/lan/catalyst2900xl_3500xl/releasesa4/eesoftconfig/masctrnk.html
>
> *Section: Defining the Allowed VLANs on a Trunk*
>
>
> HTH,
>
> Ananth
>
>
> On Mon, Jun 23, 2008 at 5:46 PM, CCIE3000 <ccie3000@googlemail.com>
> wrote:
>
>> Hi Guys,
>>
>> If you have a question that states to only allow the necessary vlans
>> across
>> the trunk and the native vlan is vlan 1 would you permit vlan 1 as well as
>> the other necessary vlan's?
>>
>> I'm just about to play on the switches now but I thought I'd throw it up
>> for
>> discussion.
>>
>> Cheers.
>>
>>
>> _______________________________________________________________________
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